the period of a 400 hertz sound wave is ___ second
Answer:
0.0025 sec
Explanation:
Period = 1 / frequency = 1/400 = 0.0025 sec
During a car accident, a 125 kg driver is moving at 31 m/s and in 1.5 seconds is brought to rest by an inflating air bag. what is the magnitude of the change in momentum of the driver? 4.0 kg • meters per second 21 kg • meters per second 47 kg • meters per second 3900 kg • meters per second
The magnitude of the change in momentum of the driver is 3900kgm/s.
Hence option D) 3900 kg • meters per second is the correct answer.
What is Momentum?Momentum is simply the product of the mass of an object and its velocity.
Its is expressed as;
P = m × v
Where m is the mass of the object and v is its velocity.
Given the data in the question;
Mass of the driver m = 125kgVelocity v = 31m/sTime elapsed t = 1.5sWe substitute the given values into the expression above to determine the initial momentum of the driver before he was brought to rest.
P initial = m × v
P initial = 125kg × 31m/s
P initial = 3875 kgm/s ≈ 3900kgm/s
Now, as the driver is brought to rest, final velocity becomes zero
P final = 125kg × 0
P final = 0
This means that the change in momentum of the driver is his initial momentum which is 3900kgm/s.
Therefore, the magnitude of the change in momentum of the driver is 3900kgm/s.
Hence option D) 3900 kg • meters per second is the correct answer.
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Answer:
D for edge
Explanation:
GO GO GO TRUST ME
Which types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light? Select two options. Radio waves infrared light microwaves gamma rays visible light X-rays.
Answer:
the answer is equal to the microwave gamma rays visible light x-rays.
The brain can be best described as which classification of the body?
o bone
o organ
ogland
O muscle
What is the force advantage of the direction changing pulley shown below?
Select one:
a. Less than 1.
b. 1.
c. Greater than 1.
d. Greater than 10.
The force advantage of the direction changing pulley shown is 1. The correct option is b.
What is force advantage?Force is the mechanical physical quantity. The force advantage is equivalent to the mechanical advantage equal to the ratio of output to the input force.
In the single fixed pulley, there is only one rope segment that pulls up on the load, so,
The force advantage is
F.A = 50 N / 50 N = 1
Thus, the force advantage of the direction changing pulley shown is 1. The correct option is b.
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A string of 5 (Five) 15 ohm Christmas tree lights are connected in parallel. One burns out, the rest will stay lit. Calculate the total resistance when one of the bulbs is out.
Pt 2.
Those five 15 ohm, series connected Christmas tree lights, calculate the total current in the circuit if they are connected to a 115 V source. What would be total power?
Pt. 3
Those five 15 ohm parallel connected Christmas tree lights. Calculate the total current in the circuit if they are connected to a 115 V source. Calculate total Power.
Please list formula and data etc etc
Answer:
r = 15 ohms for a single bulb
1 / R = 1 / r + 1 / r + 1 / r + 1 / r
R = r / 4 = 15 / 4 = 3.75 ohms total resistance
part II
If bulbs are in series R = 5 * 15 ohm = 75 ohm total resistance
P = I V = V / R * V = V^2 / R
P = 115^2 / 75 = 176 watts
part III
If the bulbs are in parallel then
R = 15 / 5 = 3 ohms for the circuit
I = 115 / 3 = 38.3 amps for circuit
P = 115^2 / 3 = 4400 watts
Check: P = I V = 38.3 * 115 = 4400 watts
What happens when two
electrons get close
together?
Answer:
when two electrons are in close proximity Each atom's electron begins to detect the proton of the other atom. As a result, it is attracted to not just its own proton, but also the proton of the other atom.
Find the change in kinetic energy if if a 0. 65 kg fish leaping to the right a 15 m/s
The value of change in kinetic energy, when fish with mass 0. 65 kg is leaping to the right at 15 m/s, is 93.1 J.
What is kinetic energy?Kinetic energy is a type of energy, which a body is posses due to its motion. The kinetic energy of a body can be found with the following formula,
[tex]KE=\dfrac{1}{2}mv^2[/tex]
Here, (m) is the mass of the body, and (v) is the speed of the body.
When the two objects collides, then the initial collision of the two body is equal to the final collision of two bodies by the law of conservation of momentum.
[tex]m_1u_1 + m_2u_2 = (m_1+m_2)v[/tex]
Here, (m) is the mass, (u) is initial velocity before collision, v is final velocity after collision and (subscript 1,2) are used for fish 1 and 2.
The mass of the first fish is 0. 65 kg. This fish leaping to the right at 15.0 m/s collides inelastically with another fish with mass 0.950 kg leaping to the left at 13.5 m/s. Put the values,
[tex]m_1u_1 + m_2u_2 = (m_1+m_2)v\\0.65\times15 +0.95\times(-13.5) = (0.65 + 0.95)\times v[/tex]
The value of initial velocity of the second fish is taken negative as it is leaping to the left.
[tex]0.65\times15 +0.95\times(-13.5) = (0.65 + 0.95)\times v\\v=-\dfrac{3.075}{1.6}\\v=-1.9219\rm\; m/s[/tex]
This is the final velocity. Now to find the change in kinetic energy use the formula of kinetic energy,
[tex]\Delta KE=\dfrac{1}{2}(0.65)(12-(-1.9219))^2\\\Delta KE=93.1\rm\; J[/tex]
Thus, the value of change in kinetic energy, when fish with mass 0. 65 kg is leaping to the right at 15 m/s, is 93.1 J.
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An electron and a 0.0500-kg bullet each have a velocity of magnitude 510 m/s, accurate to within 0.0100%. Within what lower limit could we determine the position of each object along the direction of the velocity
The lower limit that could be used to determine the position of each object along the direction of the velocity is 1.136 x 10⁻³ m.
Uncertainty in the position of the electronThe uncertainty in the position of the electron is calculated as follows;
[tex]\Delta x = \frac{h}{4\pi m\Delta v}[/tex]
where;
h is Planck's constant = 6.63 x 10⁻³⁴ Jsm is mass of electronΔv uncertainty in velocity = (0.01 x 10⁻²) x 510 = 0.051 m/s[tex]\Delta x = \frac{6.63 \times 10^{-34} }{4\pi \times 9.11 \times 10^{-31} \times 0.051} \\\\\Delta x = 1.136 \times 10^{-3} \ m[/tex]
Thus, the lower limit that could be used to determine the position of each object along the direction of the velocity is 1.136 x 10⁻³ m.
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Comets that come from the oort cloud have orbits that:
a. decay over time, bringing them closer to the sun each year.
b. have random tilts and orbits, sharing little with each other.
c. have very short orbits for their size and distance from the sun.
d. are evenly distributed between retrograde and prograde.
Comets that come from the Oort cloud have orbits that decay over time, bringing them closer to the sun each year. Option A is correct.
What are comets?Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ice.
They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a plane.
Comets that come from the Oort cloud have orbits that decay over time, bringing them closer to the sun each year.
Hence,option A is correct.
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Answer:
B) have random tilts and orbits, sharing little with each other
Explanation:
Hope this helps, have a great rest of your day/ restful night!
The capacitor can withstand a peak voltage of 670 v. If the voltage source operates at the resonance frequency
The value of maximum voltage, when the capacitor can withstand a peak voltage of 670 v is 47.6 volts.
What is resonance frequency?Resonance frequency is the natural frequency of an particle or object. At this frequency, the object tries to vibrate at higher amplitude. It can be calculated with the following formula:
[tex]f=\dfrac{1}{2\pi LC}[/tex]
Here, L is the induction and C is the capacitance.
Let for an L-R-C circuit, the value of resistance is 400 ohm, induction is 0.380 Haney and capacitance is 1.20×10⁻² μF.
Put the values in above formula,
[tex]f=\dfrac{1}{2\pi(0.380)(1.20\times10^{-8})}\\f=2356.8\rm\; Hz[/tex]
The capacitor can withstand a peak voltage of 670 v. Use the following formula to find the value of current as,
[tex]I=2\pi fC\times Vc\\I=2\pi (2356.8)(1.20\times10^{-8})\times 670\\I=0.119\rm\; A[/tex]
The value of resistance is 400 ohms. Thus, the voltage is,
[tex]V=IR\\V=(0.119)(400)\\V=47.6\rm\; V[/tex]
Thus, the value of maximum voltage, when the capacitor can withstand a peak voltage of 670 v is 47.6 volts.
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a seismic wave has a measured wavelength of 0.50 km. its frequency is 27 hz. what is the velocity of the wave?
Answer:V=13500m/s
As
V=fλ
Where v is velocity, f is frequency and λ is the wavelength
f=27hz or 27/s
λ=0.50km=0.50*1000m=500m
Putting given values in the formula
V=(27/s)*(500m)
V=13500m/sss
anyone could answer this question
What amount of charge passes through a 3.0 amp television in 1.3 hours?
Answer:
60
Explanation
Dont judge me but I convert 1.3 hours to 78 minutes, then divide with 3.0 and we end up with 60C
The amount of charge that passes through a 3.0 amp television in 1.3 hours would be 14040 Coulombs.
What is an electric charge?Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive or negative electric charge.
I = Q / T
As given in the problem, we have to find out what amount of charge passes through a 3.0 amp television in 1.3 hours.
Let us first convert the time period of hours into seconds
1 hour = 3600 seconds
1.3 hours = 1.3 × 3600 seconds
= 4680 seconds
By using the above relation between electric current and electric charge
and by substituting the respective values of the charge and the time period
I = Q / T
3 = Q / 4680
Q = 3 × 4680
= 14040 Coulombs
Thus, the amount of charge that passes through a 3.0 amp television in 1.3 hours would be 14040 Coulombs.
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At what point of a projectile motion, acceleration and velocity are perpendicular to each other?
Answer:
At the topmost point where the velocity has only horizontal component whereas the acceleration is vertical.
Explanation:
There is only a horizontal component of velocity at the ap3x of the projectile, and acceleration is vertically downwards owing to gravitation, therefore velocity and acceleration are perpendicular to one another.
Mr. Galonski just discovered that he has been turned into a superhero and is now one hundred times more acidic than water! He then found out that he has an arch-nemesis named Baron von Base who has a pH of 11. Using this information, who would be furthest from neutral on the pH scale and therefore "stronger"?
pH water = 7 = [H⁺] = 10⁻⁷
Mr. Galonski one hundred times more acidic than water = 100 times more H⁺ = 10⁻⁵ ⇒ pH = 5
Baron von Base has a pH of 11
The furthest from neutral (pH=7) on the pH scale = Baron von Base
1- The wave length is the distance between the middle of a crest to the middle of the next trough
true
or
false
Answer:
False
Explanation:
Middle of crest to middle of NEXT CREST is wavelength
As altitude increases, what happens to air pressure?
it fluctuates.
it increases.
it decreases.
it stays the same.
As altitude increases, air pressure decreases. hence option C is correct.
What is Atmospheric pressure ?It is pressure exerted by the weight of the atmosphere at sea level. its value is 101,325 Pascal which we call it as 1 atmospheric pressure expressed as 1 atm. i.e. 1 atm = 101,325 N/m².
Like water has pressure when we go long inside the water, our atmosphere has also pressure from top to surface of the earth.
There are different layers of atmosphere from bottom to top which are Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
Each layer has its own range and weight.
When we are on the surface of the earth, all layers of atmosphere will apply pressure. but when we increase altitude(height), the number layers reduces and its weight too.
Hence as altitude increases, air pressure decreases.
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1.Some objects fall faster than other objects due to ____ _________________. If there is no ____ _________________, then all objects will fall at the same rate.
2.
a. How do parachutes use air resistance to help skydivers land safely (page 3)?
b. Which has more air resistance: a flat sheet of paper or a paper airplane (feel free to test it out!)? Explain your answer.
Answer:
number 1 is ( Some objects fall faster than other objects due to air resistance . If there is no air resistance , then all objects will fall at the same rate.) number two is (How do parachutes use air resistance to help skydivers land safely (page 3)? The air resistance overwhelms the doward force of gravity.) Explanation:
In real number multiplication, if uv1=uv2 and u does not equal zero we can cancel out u and conclude that v1=v2. Does the same rule hold for the dot product?
The conclusion v₁=v₂ can not be made. Let u=(1,1,1),v₁=(2,3,-5),v₂=(4,-1,-3). The dot product of u.v₁=uv₂ is satisfied,but v₁≠v₂.The correct answer is c.
What is dot product?The dot product, also known as the scalar product, is an algebraic operation that yields a single integer from two equal-length sequences of numbers.
The dot product of two vectors' Cartesian coordinates is commonly used in Euclidean geometry.
Because there may be more than the 1 vectors satisfying the expression.
[tex]\rm uv_1 = 1 \times 2 +1 \times 3 +1 \times(-5)=0[/tex]
[tex]\rm uv_2= 4-1-3 =0[/tex]
The v₁ is not found equal to the v₂.
The conclusion v₁=v₂ can not be made. Let u=(1,1,1),v₁=(2,3,-5),v₂=(4,-1,-3). The dot product of u.v₁=uv₂ is satisfied,but v₁≠v₂.The correct answer is c.
Hence, the correct answer is c.
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The magnitude of the earth pulling on you is equivalent to your body weight.
O A. True
OB. False
Answer:
I think its O A. True.
What is inertia?
a. a type of kinetic friction
b. the normal force on ah incline
c. the tendency of an object to maintain its state of motion
d. the reaction to an action force
d. We should always measure the least count of tool before experimenting. Discuss the importance of calculating least count of tools before experimenting.
The count of the number of tools is fundamental because it allows us to design a suitable experimental procedure.
What is an experimental procedure?An experimental procedure is a step of the scientific method based on a process to validate or reject our working hypothesis.
The experimental procedure needs to have into account the different tools required for the experiment to be carried out by the researcher.
In conclusion, the count of the number of tools is fundamental because it allows us to design a suitable experimental procedure.
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Dust, accumulated at the time of the formation of the solar system is sometimes preserved in asteroids, meteoroids, and meteorites. what are these pockets of early solar system materials called
The dust, accumulated at the time of the formation of the solar system that are preserved in asteroids, meteoroids, and meteorites are called chondrules.
What is the solar system?The solar system is composed of the earth and the planets. The solar system was formed millions of years ago.
The dust, accumulated at the time of the formation of the solar system that are preserved in asteroids, meteoroids, and meteorites are called chondrules.
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An object has a velocity of 8 m/s and a kinetic energy of 480 J. What is the mass of the object? (Formula: ) 7. 5 kg 15 kg 60 kg 120 kg.
Answer:
15 kg
Explanation:
KE = 1/2 * m * v² ⇒ m = (2*KE) / v²
m = (2*480) / 8²
m=15 kg
help me please.....●_●
Answer:
Length -> meter
Mass -> kilogram
Time -> second
g for gram
mg for milligram
t for time
μm for micrometer
ms for millisecond
300cm = 3m
500g = 0.5kg
1500m = 1.5km
250ms = 0.25s
3.65×10^4g = 36.5kg
What are voltage and current in electricity?
Answer:
Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points.
What question is maya most likely trying to answer? how does the type of material used in the core affect the strength of an electromagnet? how does the number of loops of wire affect the strength of an electromagnet? how does the speed at which an iron bar is removed from wire loops affect the strength of an electromagnet? how does the thickness of the wire affect the strength of an electromagnet?
The question is maya most likely trying to answer is, how does the thickness of the wire affect the strength of an electromagnet?
What is effect of thickness of wire on strength of electromagnet?
From the experimental set-up by maya, we can determine the effect of thickness of wire on strength of electromagnet.
R ∝ 1/A
where;
R is resistance of the wiresA is area of the wires (from thickness or radius of the wire)As the thickness of the wire increases, the area of the wire increases and the resistance of the wire will decrease. As the resistance of the wire decreases, the current flowing in the wire increases as well.
Thus, the increase in the thickness of a wires increases, the strength of an electromagnet.
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Answer:
A
Explanation:
0.318 cm. What is the ideal mechanical advantage?
The ideal mechanical advantage will be 8.017. The ideal mechanical advantage value may be grater than the actual value of mechanical advantage.
What is mechanical advantage ?
Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of forces in levers and pulley.
The ideal mechanical advantage is found as;
[tex]\rm IMA = \frac{d \pi}{l} \\\\ \rm IMA = \frac{0.812 \times \pi}{0.318} \\\\ IMA=8.017[/tex]
The ideal mechanical advantage will be 8.017.
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What are the properties of a good conductor
The Properties of good conductor are given below:
Explanation:
1.It posses very low resistance or specific resistance.
2.It posses more conductance and there by conducts electricity readily through it.
3.It is a good conductor of heat.
4.It is highly resistance to corrosion by liquid.
5.It must be malleable and ductile.
6.It must be flexible.
7.It should not react with climatic conditions.
8.It can be drawn in very fine wires.