According to the law of conservation of momentum, the total momentum of the system of the dolphin and the ball is conserved. Initially, the dolphin and the ball have a total momentum of zero as the ball is at rest.
When the dolphin hits the ball, it exerts a force on it, causing it to move in the direction of the force.
This creates a net momentum in the direction of the ball's motion, which is equal in magnitude and opposite in direction to the momentum of the dolphin.
Therefore, the dolphin's momentum decreases while the ball's momentum increases.
The dolphin continues moving forward but with a reduced velocity, while the ball moves away from the dolphin with a velocity that depends on the mass of the ball and the force applied by the dolphin.
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Which class of fires consists of flammable liquids including.
Answer:
class b
Explanation:
flamabal liquids , gas alcohol or oil
The interior of a refrigerator has a surface area of 2. 6 m². It is insulated by a 4. 5 cm thick material that has a thermal conductivity of. 0119 J/m×s ° C. The ratio of the heat extracted from the interior to the work done by the motor is 3. 8% of the theoretical maximum. The temperature of the room is 46. 5°C, and the temperature inside the refrigerator is 8. 5°C. Determine the power required to run the compressor. Answer in units of W
The power required to run the compressor is 18,506 W or approximately 18.5 kW, calculated using the rate of heat transfer through the insulation and the efficiency of the refrigerator.
To determine the power required to run the compressor, we need to consider the heat transfer that occurs through the insulation and the temperature difference between the interior of the refrigerator and the room.
First, we can calculate the rate of heat transfer through the insulation using the formula:
Q = kA (ΔT / d)
where Q is the rate of heat transfer, k is the thermal conductivity of the insulation material, A is the surface area of the refrigerator, ΔT is the temperature difference between the interior and exterior of the refrigerator, and d is the thickness of the insulation. Plugging in the given values, we get:
Q = (0.0119 J/m·s·°C) × (2.6 m²) × ((46.5°C - 8.5°C) / 0.045 m)
Q = 581.6 W
This represents the rate at which heat is flowing into the refrigerator from the warmer surroundings. To maintain the interior temperature at 8.5°C, the refrigerator must remove this heat at the same rate.
The ratio of the heat extracted from the interior to the work done by the motor is 3.8% of the theoretical maximum. The theoretical maximum is given by the Carnot efficiency, which is:
η = 1 - (T_cool / T_hot)
where T_cool is the temperature inside the refrigerator and T_hot is the temperature outside. Plugging in the given values, we get:
η = 1 - (8.5°C / 46.5°C) = 0.8172
So the actual efficiency of the refrigerator is:
ε = 0.038 × 0.8172 = 0.0314
This means that for every 1 W of power consumed by the motor, the refrigerator extracts 0.0314 W of heat from the interior. Therefore, the power required to run the compressor is:
P = Q / ε = 581.6 W / 0.0314 = 18,506 W
So the power required to run the compressor is 18,506 W or approximately 18.5 kW.
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A particle is confined to move on the surface of a circular cone with its axis on the vertical z axis, vertex at the origin (pointing down), and half-angle a. (a) Write down the Lagrangian L in terms of the spherical polar coordinates r and 0. (b) Find the two equations of motion. Interpret the 0 equation in terms of the angular momentum tz, and use it to eliminate 4 from the r equation in favor of the constant fz. Does your r equation make sense in the case that = 0? Find the value ro of r at which the particle can remain in a horizontal circular path. (c) Suppose that the particle is given a small radial kick, so that r(t) = ro E(t), where E(t) is small. Use the r equation to decide whether the circular path is stable. If so, with what frequency does r oscillate about r0?
The Lagrangian is then given by L = T - V.
(a) Writing down the Lagrangian (L): The Lagrangian is the difference between the kinetic and potential energies of the system.
In this case, the particle is confined to move on the surface of a circular cone, so we need to express the kinetic and potential energies in terms of the spherical polar coordinates (r, θ).
The kinetic energy can be expressed as T = (1/2) m (dr/dt)^2 + (1/2) m r^2 (dθ/dt)^2, where m is the mass of the particle.
The potential energy can be expressed as V = m g r cosθ, where g is the acceleration due to gravity.
The Lagrangian is then given by L = T - V.
(b) Finding the equations of motion: The equations of motion can be obtained by applying the Euler-Lagrange equations to the Lagrangian L.
This involves taking partial derivatives of L with respect to the generalized coordinates (r, θ) and their derivatives (dr/dt, dθ/dt), and then solving the resulting equations.
One of the resulting equations of motion will be related to the angular momentum tz. It can be interpreted as the conservation of angular momentum around the z-axis.
The r equation of motion can be used to eliminate θ from the r equation, in favor of a constant fz.
The r equation should make physical sense even when θ = 0.
To find the value ro of r at which the particle can remain in a horizontal circular path, you would need to analyze the equilibrium conditions of the system and solve for r.
(c) Analyzing stability and frequency of oscillation: By assuming r(t) = ro + E(t), where E(t) is a small radial perturbation from the equilibrium position ro, you can substitute this expression into the r equation of motion to determine whether the circular path is stable.
Stability can be determined by examining the behavior of the perturbation E(t) over time.
The frequency of oscillation about ro can be obtained by analyzing the form of the solution E(t) and determining the frequency at which it oscillates.
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What are the effects of elastic limit on a structure built on a fault line?
The elastic limit is the maximum stress that a material can withstand without undergoing permanent deformation.
When a structure is built on a fault line, the elastic limit plays a crucial role in determining its ability to withstand seismic forces.
If the stress caused by an earthquake exceeds the elastic limit of the structure's materials, the structure may experience permanent deformation, which can lead to compromised structural integrity and potential failure.
In contrast, if the stress remains within the elastic limit, the structure can return to its original shape once the stress is removed, maintaining its structural integrity.
In conclusion, the elastic limit affects a structure built on a fault line by determining its resilience to seismic forces.
Ensuring that the stress remains within the elastic limit can help maintain the structure's integrity and minimize damage during earthquakes.
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What is the speed of light in a medium having an
absolute index of refraction of 2.3?
About 130,346,719.13 meters per second is the speed of light in a medium having an absolute index of refraction of 2.3.
To solve this problem
The difference between the speed of light in the medium and the speed of light in a vacuum or in air is known as the refractive index of a media.
n = c / v
We are given that the absolute refractive index of the medium is 2.3. So, we can write:
n = 2.3
Thus, the speed of light in the medium is:
v = c / n = c / 2.3
The speed of light in a vacuum or in air, denoted by the symbol c, is around 299,792,458 meters per second. Therefore, by substituting this value, we obtain:
v = 299,792,458 m/s / 2.3
Simplifying this expression gives:
v = 130,346,719.13 m/s
Therefore, About 130,346,719.13 meters per second is the speed of light in a medium having an absolute index of refraction of 2.3.
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Water has a specific heat capacity of 4. 184 J/g℃. The experiment heated 200g of water from 30℃ to 100℃. How much energy is absorbed by the water?
1) 25,104J
2) 83,680J
3) 14,000J
4) 58,576J
The amount of energy absorbed by the water is 58,576J. The answer is 4) 58,576J.
The formula to calculate the amount of energy absorbed by the water is:
Q = m x c x ΔT
Where Q is the amount of energy absorbed (in Joules), m is the mass of water (in grams), c is the specific heat capacity of water (in J/g℃), and ΔT is the change in temperature (in ℃).
Substituting the given values, we get:
Q = 200g x 4.184 J/g℃ x (100℃ - 30℃)
Q = 200g x 4.184 J/g℃ x 70℃
Q = 58,576J
Therefore, the amount of energy absorbed by the water is 58,576J. The answer is 4) 58,576J.
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Bumper cars are a fairground ride and are designed to bump into each other. Two bumper cars moving towards each other.
1. )Give two factors that affect the momentum of each bumper car. [2marks]
2. )The bumper cars crash into each other and stop.
Explain why both bumper cars stop after the crash. [4marks]
Bumper cars are a popular ride at fairs and amusement parks, designed for riders to bump into each other while driving around. When two bumper cars move towards each other, there are two factors that affect the momentum of each car.
The first factor is the mass of the car. The heavier the car, the more momentum it has. So, a heavier bumper car will be harder to stop and will have more force when it hits another car. The second factor is the speed of the car. The faster a car is moving, the more momentum it has.
Therefore, if two cars are moving at the same speed, they will have equal momentum. However, if one car is moving faster than the other, it will have more momentum and cause a greater impact when it collides.
When two bumper cars crash into each other, both cars come to a stop. This is due to the law of conservation of momentum. This law states that in a closed system, the total momentum before a collision is equal to the total momentum after the collision.
In this case, the two bumper cars collide and their momentum is transferred to each other, causing both cars to come to a stop.
When the cars collide, the force of the impact causes the cars to stop. The cars' kinetic energy is transferred to other forms of energy, such as heat and sound.
Additionally, the cars' bumpers are designed to absorb some of the impact, which also helps to slow the cars down and prevent injury to the riders.
In conclusion, the momentum of a bumper car is affected by its mass and speed. When two cars collide, they come to a stop due to the law of conservation of momentum. The force of the impact and the design of the bumpers also play a role in the cars' deceleration.
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c. To what height can a 400w engine lift a 100kg mass in 3s?
We need to use the formula for work done, which is :
W = F x D
P = W / T
In this case, the force (F) is equal to the weight of the mass, which is :
F = m x g
where m is the mass (100kg) and g is the acceleration due to gravity (9.81 m/s²).
F = 100kg x 9.81 m/s² = 981 N
The power (P) of the engine is 400 W, and the time (T) is 3 seconds.
P = W / T, therefore W = P x T = 400 W x 3 s = 1200 J
Now we can use the work formula to find the distance (D) that the engine can lift the mass :
D = W / F = 1200 J / 981 N = 1.22 m
Therefore, the 400W engine can lift a 100kg mass to a height of 1.22 meters in 3 seconds.
An unknown force is applied to a 12 kg mass. The force acts at an angle of 30.0 degrees above the horizontal.
Determine the force acting if the force acts for a horizontal displacement of 22 meters and increases the 12 kg mass's
speed from 11 m/s to 26 m/s.
The force acting on the 12 kg mass would be 11 N.
To solve this problem, we need to use the work-energy principle, which states that the work done by a force on an object is equal to the change in the object's kinetic energy.
First, we need to calculate the initial and final kinetic energy of the 12 kg mass.
The initial kinetic energy is given by:
K₁ = (1/2) * m * v₁²
= (1/2) * 12 kg * (11 m/s)²
= 726 J
The final kinetic energy is given by:
K₂ = (1/2) * m * v₂²
= (1/2) * 12 kg * (26 m/s)²
= 936 J
The change in kinetic energy is:
ΔK = K₂ - K₁
= 936 J - 726 J
= 210 J
Next, we need to calculate the work done by the unknown force. We can do this by using the formula:
W = F * d * cosθ
where W is the work done, F is the force, d is the displacement, and θ is the angle between the force and displacement vectors.
In this case, the displacement is 22 meters, and the angle θ is 30 degrees. So we have:
W = F * d * cosθ
= F * 22 m * cos(30°)
= 19.1 F
Finally, we can use the work-energy principle to solve for the unknown force:
W = ΔK
19.1 F = 210 J
F = 11 N
Therefore, the force acting on the 12 kg mass is 11 N.
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In a series circuit, how will the potential difference across a resistor and a lamp change if a switch is closed?
Because the total voltage supplied by the battery is distributed among all the components in a series circuit, if a switch is closed, the potential difference across the resistor and bulb will remain unchanged.
What happens in a series circuit if the switch is closed?The light cannot be turned on when the switch is open because the circuit is incomplete. The circuit lacks a closed-loop channel for the current to follow.
When resistors are connected in series, what happens to the potential difference?The potential difference between the two extremes of the arrangement in a series connection of resistors is equal to the total of the potential differences across individual resistors.
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How does a van de graaff generator create static electricity?.
Answer:
The generator makes static electricity the same way you do when you rub your feet on the carpet and then touch a doorknob.
Explanation:
. Inside the generator is a giant rubber band that rubs across a piece of felt, stealing its electrons. The rubber band then spins around and the electrons travel up to the big metal ball on top.
A cardboard box sits on top of an asphalt driveway. the coefficient of static friction is 0.7 and the coefficient of friction is 0.4 . the mass of the box is 10 kg and a horizontal force of 15 n is applied. what is the gravitational force?
what is the frictional force?
what is the acceleration?
According to the question, the gravitational force is 98 N. The frictional force is 39.2 N. The acceleration is 1.5 m/s².
What is gravitational force?Gravitational force is a natural phenomenon that exists between any two objects with mass. It is the force of attraction between two masses that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This force is usually expressed in Newton's law of universal gravitation, where the force of gravity between two objects can be calculated by multiplying their masses and dividing by the square of the distance between them.
The gravitational force is the force of gravity that acts on the box and is equal to the mass of the box times the acceleration due to gravity.
Gravitational force = 10 kg × 9.8 m/s² = 98 N
The normal force is equal to the mass of the box times the acceleration due to gravity.
Frictional force = coefficient of friction × normal force
= 0.4 × (10 kg × 9.8 m/s²)
= 39.2 N
The acceleration of the box is calculated using Newton's second law of motion, which states that the net force on an object is equal to the mass of the object times its acceleration.
Net force = mass × acceleration
15 N = 10 kg × a
a = 1.5 m/s²
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A 12 V battery is connected across two parallel metal plates separated by 0.59 cm. Find the magnitude of the electric field.
The magnitude of the electric field between two parallel plates is given by:
E = V/d
where V is the potential difference between the plates and d is the distance between them.
In this case, V = 12 V and d = 0.59 cm = 0.0059 m. Substituting these values, we get:
E = 12 V / 0.0059 m
E = 2033.9 V/m
Therefore, the magnitude of the electric field is 2033.9 V/m.
Answer Please With Explanation
The change, on its own, that will cause the voltmeter to show a positive reading is Reduce the intensity of light incident on the light-dependent resistor (LDR). Option C
Why would reduction in the intensity of Light on the LDR cause the voltmeter to show a positive reading?When the intensity of light incident is reduced on the light-dependent resistor LDR, it will increase its resistance.
This would cause a massive drop in voltage across the LDR.
This will then cause the potential at Y to be lower than that at X. This change alone could result in a positive reading on the voltmeter.
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If a bottle of oxygen with a pressure of 500 kPa with a volume of. 30 L at 290 K has a temperature change to 370 K and the volume changed to 1. 5 L because the bottle broke open and leaked into the bottles outer container, then what is the new Pressure of the oxygen?
Remember the combined gas law equation. P1V1 / T1 = P2V2 / T2
a
. 128 kPa
b
128 kPa
c
0 kPa
d
500 kPa Lp
The new pressure of the oxygen is 128 kPa. The correct answer is (a).
In the given problem, we are given the initial pressure, volume, and temperature of oxygen in a bottle and asked to find the new pressure of oxygen after the bottle breaks open and leaks into the outer container. We can use the combined gas law equation to find the new pressure of oxygen. The volume and temperature of the oxygen changes from 0.3 L and 290 K to 1.5 L and 370 K, respectively, while the amount and state of the oxygen remain constant. Using the combined gas law equation P₁V₁ / T₁ = P₂V₂ / T₂, we can find the new pressure of the oxygen:
P₂ = (P₁ x V₁ x T2) / (V₁ x T₁)
P₂ = (500 kPa x 0.30 L x 370 K) / (1.5 L x 290 K)
P₂ = 128 kPa
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Technician a says that there is often more than one circuit being protected by each fuse. Technician b says that more than one circuit often shares a single ground connector. Which technician is correct?
a. Technician a.
b. Technician b.
c. Both technician a and b.
d. Neither technician a and b
The correct answer is c. Both Technician A and B are correct.
Technician A is correct because there is often more than one circuit being protected by each fuse. Fuses are used to protect electrical circuits from excessive current, which can cause damage or fire. It is common for multiple circuits to be connected to a single fuse, as it simplifies the electrical system and reduces the number of fuses needed.
Technician B is also correct because more than one circuit often shares a single ground connector. A ground connector provides a path for excess electrical energy to flow safely to the ground, preventing damage to components and electrical shock. By sharing a ground connector, multiple circuits can utilize a common grounding point, further simplifying the electrical system and reducing the need for additional connectors.
Overall Both technicians are correct, as multiple circuits can be protected by a single fuse, and multiple circuits can share a single ground connector.
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your group has invented a solar cell that works by applying photosynthesis chemistry to generating hydrogen which is stored for use in a fuel cell. in 10 different regions differing by weather. you set up solar-city installations (using solar cells and lead acid batteries for storage) and your technology comparing the kilowatt hours generated in a month the results are:
The solar cell that applies photosynthesis chemistry to generate hydrogen is different from traditional solar cells that directly convert sunlight into electricity because it uses a chemical process to store the energy generated by sunlight, whereas traditional solar cells directly produce electricity.
In the photosynthesis-based solar cell, the energy from sunlight is used to split water into hydrogen and oxygen through a chemical reaction, and the hydrogen is stored for later use in a fuel cell to generate the electricity. Traditional solar cells, on the other hand, generate electricity by converting sunlight directly into electrical energy through the photovoltaic effect.
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--The complete Question is, How does the solar cell that applies photosynthesis chemistry to generate hydrogen differ from traditional solar cells that directly convert sunlight into electricity? --
You find some limestone rock in southern Indiana and notice that it has fossil trilobites in it. Later you find the same fossil trilobites in a limestone in Colorado. From this you determine that the two rock types were deposited during the same time period using what concept or principle?
The concept or principle used to determine that the two rock types were deposited during the same time period is the principle of faunal succession.
This principle states that fossils of similar organisms found in rocks from different locations were deposited during the same time period, as the distribution of fossils in the rock layers is related to the relative ages of the rocks.
By finding the same fossil trilobites in both the Indiana and Colorado limestone rocks, it can be inferred that the rocks were deposited during the same time period and were likely part of the same geologic formation.
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The microwave transmitters that we use have a frequency of about 10 ghz. What is the approximate wavelength?.
The wavelength of a microwave frequency is the inverse of its frequency; that is, the wavelength is equal to the speed of light (in a vacuum) divided by the frequency. In this case, the frequency is 10 GHz, meaning the wavelength is approximately 3 cm.
Wavelength is the distance from one peak of a wave to the next, and is inversely proportional to frequency; that is, as frequency increases, wavelength decreases. Microwaves, which have frequencies between 300 MHz and 30 GHz, have wavelengths of 1 m to 1 cm, respectively. This makes them ideal for applications that require short-range communication, such as microwave ovens, wireless communication, and radar.
Microwaves are also used in remote sensing, as they can penetrate some materials, such as clouds, allowing us to measure the properties of objects behind them.
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You travel 20.0 km to the right and you realized you have to drive back 5.0 km. the journey took 2 hours to complete. find the following:
a. the total distance you traveled
b. the total displacement you traveled
c. your average speed
d. your average velocity
(pls put an explanation the the answers ty!!)
The total distance you traveled is 25.0 km, and the total displacement you traveled is 15.0 km to the right and average speed is 12.5 km/h and velocity is 7.5 km/h to the right.
a. To find the total distance you traveled, add the distance you traveled to the right (20.0 km) and the distance you traveled back (5.0 km). Total distance = 20.0 km + 5.0 km = 25.0 km.
b. To find the total displacement, subtract the distance you traveled back (5.0 km) from the distance you traveled to the right (20.0 km). Total displacement = 20.0 km - 5.0 km = 15.0 km to the right.
c. To find your average speed, divide the total distance you traveled by the time it took to complete the journey. Average speed = Total distance / Time = 25.0 km / 2 hours = 12.5 km/h.
d. To find your average velocity, divide the total displacement by the time it took to complete the journey. Average velocity = Total displacement / Time = 15.0 km / 2 hours = 7.5 km/h to the right.
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1. Describe something other than the examples you've been given that you believe uses a
capacitor and describe its function in the device.
Because capacitors have the ability to filter signals, they are frequently employed in a variety of audio devices like loudspeakers, microphones, woofers, tweeters, and other similar devices.
What are some practical applications for capacitors?Energy storage, power conditioning, electronic noise filtering, distant sensing, and signal coupling and decoupling are some of the most typical uses for capacitors. Capacitors are employed in a variety of industries because they serve an essential and adaptable function in a wide range of applications.
Do phones make use of capacitors?Today's smartphone antenna systems depend heavily on capacitors. They are mostly employed for impedance matching, frequency tuning, and filtering.
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Eye color is an example of a??
Answer:
Trait
Explanation:
You already have the right answer chosen.
Answer:
trait
Explanation:
Looks like you already had the right answer
What is the absolute index of refraction of medium x?
The refractive index of the wave in medium X is 0.577.
What is the refractive index?The refractive index of a substance or medium measures how much light can bend through it. The difference between the speed of light in an object or medium and the speed of light in a vacuum (or in air) is how it is defined. Usually, the letter n is used to denote the refractive index.
The refractive index of a substance or medium is a critical property that determines how light will behave when it passes through it.
We know that the refractive index can be obtained as;
n = sin i/sinr
Thus we have that;
sin i = sin 30
sin r = sin 60
n = sin 30/sin 60
n = 0.577
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An airplane flies due north at 150km/hr with respect to the air. there is a wind blowing at 75 km/hr due east. what are the plane's speed with respect to the ground?
The plane's speed with respect to the ground is the vector sum of its velocity and the wind's velocity, which is 75 km/hr to the east.
To determine the plane's speed with respect to the ground, we can use vector addition.
We can break down the plane's velocity vector into its components: a northward component of 150 km/hr and an eastward component of 0 km/hr (since the plane is not moving eastward).
Similarly, we can break down the wind's velocity vector into a northward component of 0 km/hr and an eastward component of 75 km/hr.
To find the resultant velocity vector, we add the corresponding components of the plane and the wind.
The northward components cancel each other out, and we are left with an eastward component of 75 km/hr. Therefore, the plane's speed with respect to the ground is 75 km/hr.
In summary, the plane's speed with respect to the ground is the vector sum of its velocity and the wind's velocity, which is 75 km/hr to the east.
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What angular acceleration would be required in order to stop the earth from rotating over a period of 30.0 minutes
The angular acceleration required to stop the rotation of the Earth over a period of 30 minutes would be equal to the final angular velocity divided by the time interval.
The Earth's rotation is an example of rotational motion, which is described by angular velocity and angular acceleration. Angular velocity is the rate of change of angular displacement with respect to time, and angular acceleration is the rate of change of angular velocity with respect to time.
The final angular velocity would be zero, since the Earth would have stopped rotating, and the initial angular velocity can be calculated by dividing the circumference of the Earth (40,075 km) by the time period of 24 hours or 1,440 minutes, which gives a value of approximately 0.28 degrees per minute.
Therefore, the initial angular velocity would be (0.28 degrees/minute)(2pi radians/360 degrees) = 0.00489 radians/minute. Dividing this value by 30 minutes gives an angular acceleration of approximately 0.000163 radians/(minute²).
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A harmonic wave travels in a wire with amplitude 2.51 mm, wavelength 1.09 m, and frequency 649 hz. what is the speed with which the wave travels
The speed with which the harmonic wave travels in the wire is approximately 707.41 meters per second.
To find the speed of a harmonic wave traveling in a wire, we need to use the following formula:
Speed (v) = Wavelength (λ) * Frequency (f)
In this case, we are given the amplitude, wavelength, and frequency of the wave. The amplitude (2.51 mm) is not necessary to calculate the speed, so we can focus on the wavelength and frequency:
Wavelength (λ) = 1.09 m
Frequency (f) = 649 Hz
Now, we can use the formula to calculate the speed of the wave:
Speed (v) = 1.09 m * 649 Hz
Multiplying the wavelength and frequency together:
v = 707.41 m/s
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During each individual collision you created did each of the two carts receive the same force during the collision?
It is safe to assume that each cart would experience a distinct force during each collision caused by the carts, and the force distribution would change depending on the aforementioned criteria.
During each individual collision, it is unlikely that the two carts received the same force during the collision. This is because the force of the collision depends on various factors such as the mass and velocity of the carts, the angle of collision, and the materials of the carts.
For instance, if one cart was heavier and moving faster than the other, it would exert more force during the collision. Additionally, the angle of collision can also affect the force received by each cart.
If the collision was head-on, the force would be distributed evenly between the carts. However, if the collision was at an angle, one cart would receive more force than the other.
The materials of the carts can also affect the force of the collision, as carts made of more rigid materials would receive more force than carts made of softer materials.
Overall, it is safe to say that each individual collision created by the carts would result in different forces being exerted on each cart, and the force distribution would vary depending on the aforementioned factors.
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While at the parent-teacher conference, murphy’s teacher mentions that the apollo program-the same program that landed humans on the moon-was just propaganda to convince the soviet union to bankrupt themselves trying to do the same. the reason for this was to encourage children to take care of their own planet, rather than wasting precious resources day dreaming of leaving it. which side of the fence would you sit on? would you look for ways to save earth and our ability to stay there, or would you look to the sky, and find a new plant to live on? why?
interstellar movie☝️
I would sit on the side of looking for ways to save Earth and our ability to stay there, rather than looking to the sky to find a new planet to live on.
While finding new habitable planets is an interesting scientific pursuit, it is not a practical solution to the problems we face on Earth. Instead, we should focus on preserving and restoring our planet's ecosystems, reducing our carbon footprint, and developing sustainable technologies. Furthermore, the idea that the Apollo program was just propaganda is a conspiracy theory without any evidence to support it.
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31. Two parallel rails with negligible resistance are 10. 0 cm apart and are connected by a 5. 00 ohm resistor. The circuit also contains two metal rods having resistances of 10. 0 ohm and 15. 0 ohm sliding along the rails (Fig. P31. 31). The rods are pulled away from the resistor at constant speeds of 4. 00 m/s and 2. 00 m/s, respectively. A uniform magnetic field of magnitude 0. 0100 T is applied perpendicular to the plane of the rails. Determine the current in the 5. 00 ohm resistor.
question taken from physics for scientists and engineers, 6th edition. Chapter 31, q. 31
The current in the 5.00 ohm resistor is 0.052 A.
The induced emf in each metal rod is given by e = Blv, where B is the magnetic field strength, l is the length of the metal rod moving in the magnetic field, and v is the velocity of the rod. For the 10.0 ohm rod, the induced emf is e = (0.0100 T)(0.100 m)(4.00 m/s) = 0.00400 V. The current through the 10.0 ohm rod is then I1 = e/R1 = 0.000400 A.
For the 15.0 ohm rod, the induced emf is e = (0.0100 T)(0.100 m)(2.00 m/s) = 0.00200 V. The current through the 15.0 ohm rod is then I2 = e/R2 = 0.000133 A. Since the two rods are connected in series, the current through the 5.00 ohm resistor is the same as the current through the two rods: I = I1 + I2 = 0.000533 A.
Using Ohm's law, the voltage drop across the 5.00 ohm resistor is V = IR = (0.000533 A)(5.00 ohm) = 0.00266 V. Therefore, the current in the 5.00 ohm resistor is I = V/R = (0.00266 V)/(5.00 ohm) = 0.052 A.
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12) A girl of mass 50 Kg transports a box of mass 20 Kg up a flight of 10 steps, each step 20 cm
high. She takes 16 Seconds to climb up the steps.
a. What is her weight?
b. What is the weight of the box?
c. When she reaches the top what vertical height has she traveled?
Pls help its urgent and I will mark you brainliest
A girl carrying a 20 Kg box climbs up 10 steps, each 20 cm high, in 16 seconds. Her own mass is 50 Kg. Her weight is 490.5N. The weight of the box is 196.2 N. When the girl reaches the top, she has traveled a vertical height of 2 meters.
a. The girl's weight is given by the product of her mass and the acceleration due to gravity. Thus, her weight is:
Weight = mass x acceleration due to gravity
Weight = [tex]50 \;kg \times 9.81 \;m/s^2[/tex]
Weight = 490.5 N
b. The weight of the box is also given by the product of its mass and the acceleration due to gravity. Thus, its weight is:
Weight = mass x acceleration due to gravity
Weight = [tex]20 \;kg \times 9.81 \;m/s^2[/tex]
Weight = 196.2 N
c. The vertical height of each step is given as 20 cm or 0.2 m. Therefore, the total vertical height traveled by the girl is:
Total height = number of steps x height of each step
Total height = 10 steps x 0.2 m/step
Total height = 2 m
Hence, when the girl reaches the top, she has traveled a vertical height of 2 meters.
In summary, we calculated the weight of the girl and the box, and determined the vertical height traveled by the girl when she climbed a flight of 10 steps, each step 20 cm high, in 16 seconds.
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