Hi there!
1)
We can use the following equation to solve for resistivity.
[tex]R = \frac{\rho L}{A}[/tex]
R = Resistance (30 Ω)
ρ = Resistivity (? Ωm)
L = Length (100cm = 1 m)
A = Cross-sectional area of wire (r = 0.15m, A = πr², A = 0.0707 m²)
Rearrange the equation to solve for resistivity.
[tex]\rho = \frac{RA}{L}\\\\\rho = \frac{30 * 0.0707}{1} = \boxed{2.121 \Omega m}[/tex]
2)
The conductivity of a resistor is equivalent to:
[tex]\sigma = \frac{1}{\rho}[/tex]
σ = Conductivity (S/m)
ρ = Resistivity (2.121 Ωm)
Solve:
[tex]\sigma = \frac{1}{2.121} =\boxed{0.472 \frac{S}{m}}[/tex]
3)
We can use the equation for resistivity to solve. Rearrange the equation for length:
[tex]R = \frac{\rho L}{A}\\\\L = \frac{AR}{\rho}\\\\L = \frac{0.0707 * 5}{2.121} = \boxed{0.167 m}[/tex]
Explain why a lorry loaded with bags of maize packed high up is likely to topple when negotiating a corner.
Answer:
Due to its centre of mass being too high and because of that it is at a high risk of toppling at the corner
A car traveling at a constant speed of 30m/s passes traffic police on a motorcycle hidden behind a tree. Two seconds after the speeding car passes, the police set out to catch the car, accelerating at a constant rate of 6m/s2.
How far does the police travel until he catches the speeding car?
Give your answer in [m].
Answer:
411.37 meters
Explanation:
car position = 60 + 30 t
cop position = 1/2 a t^2 = 3 t^2 equate them
30t + 60 = 3t^2 re-arrange
3t^2 - 30t - 60 = 0 use quadratic formula to find t = 11.71 sec
1/2 (6)(11.71)^2 = 411.37 meters
Two astronauts of mass 100 kg are 2 m apart in outer space. What is the
force of gravity between them? (G= 6.67 x 10-11 N·m2/kg?)
O A. 3.33 x 10-7N
O B. 1.67 x 10-7N
х
O C. 3.33 x 10°N
-
O D. 1.67 x 10°N
SUBMIT
Answer:
solution here
The correct anwer isB .
Why does the book with more mass feel heavier in your hand
Answer:
because the book's is covered by papers
How is the gravitational force acting on a falling object calculated
Taking into account the Newton's second law, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).
Newton's second lawIn first place, acceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.
Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.
So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]Gravitational forceIn this case, the only force is gravity. Then, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).
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Light can travel through materials that you cannot see through, like wood or aluminum foil.
agree or disagree
Answer:
Agree
Explanation:
Regarding the aluminium foil, its actually a transparent material, allowing almost all light to pass through. Non-visible light, such as radio waves, x-rays, and gamma-energy photons, can most definitely can travel through wood too. So yeah agree.
Light can travel through transparent materials which we can see through. Materials like, wood, aluminums foil etc. are opaque to light and does not pass light through it. Hence, disagreeing to the statement.
What is transparency?A material is said to be transparent if light can pass through it. Thus light any of the phenomenon like transmission, absorption or reflection. A fraction of light transmitting through the material is absorbed by it.
Mirror, glass, water etc. are transparent and light can transmit through it. These materials can absorb light and reflect a portion. The amount of incident light that is absorbed by the material is dependent on its nature.
Objects that does not pass light through them are called opaque. They cant absorb or reflect light. Objects such as wood, aluminum foil, metals such as iron etc. are opaque. Thus, the given statement is false.
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Are there more Wheels or Doors in the world?
(only wheels that turn on an axel)
PLEASE HELP
Which of the following best describes the relationship between kinetic energy
(movement) of particles/molecules and temperature?
As kinetic energy decreases, temperature increases.
kinetic energy ingreases, temperature also increases.
Kinetic energy has no
effect on temperature.
As kinetic energy increases, temnerature
Answer:
As the kinetic energy increases, temperature also increases
is the fastest launch coaster in the world, launching its 3864 kg trains to 240 km/h (149 mph) in 4 seconds. This means its rate of acceleration is 16.67 m/s/s. How much force was required to do this?
Answer:
64 412 .88 N
Explanation:
F = ma
= 3864 kg * 16.67 m/s^2 = 64412.88 N
Select the correct answer. What system prepares the body for the fight-or-flight response in stressful situations? A. somatic nervous system B. sympathetic nervous system C. parasympathetic nervous system D. central nervous system
Answer:
the sympathetic nervous system
Explanation:
It triggers the fight-or-flight response.
What is the resultant of the vectors shown?
Answer:
Option B
Explanation:
Option A is the wrong answer because the horizontal vector is in the opposite direction.
Option C is the wrong answer as the horizontal vector is in the opposite direction and all the vectors are connected head to tail [of the arrows] [Triangle law of vector addition]
Option D is the wrong answer as the horizontal vector is in the opposite direction.
If a 0.08 kg cell phone falls off a table at 15 m/s, then what is its
kinetic energy right before it hits the ground?
J
Do not include units in your answer.
Enter the answer
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The kinetic energy of the cell phone before it hits the ground given the data is 9 J
Data obtained from the question Mass (m) = 0.08 Kg Velocity (v) = 15 m/sKinetic energy (KE) =?How to determine the kinetic energy
The kinetic energy of the cell phone can be obtained as follow
KE = ½mv²
KE = ½ × 0.08 × 15²
KE = 0.04 × 225
KE = 9 J
Thus, the kinetic energy of the cell phone is 9 J
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The kinetic energy right before it hits the ground is 0.6 J
Kinetic EnergyKinetic energy is the energy possessed by a body in motion. The S.I unit is Joule. Kinetic energy depends on:
The mass of the bodyThe velocity of the bodyGiven that a 0.08 kg cell phone falls off a table at 15 m/s, its
kinetic energy right before it hits the ground can be calculated by using the formula;
K.E = 1/2 x m x [tex]v^{2}[/tex]
The given parameters are:
mass m = 0.08 kg
velocity v = 15 m/s
Substitute the parameters into the formula
K.E = 1/2 x 0.08 x 15
K.E = 0.6 J
Therefore, its kinetic energy right before it hits the ground is 0.6 J
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Two converging lenses are separated by 27.0 cm. The focal length of each lens is 8.90 cm. An object is placed 33.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.
Answer:
1/i + 1/o = 1/f thin lens equation
i = 33 * 8.9 / (33 - 8.9) = 12.2 cm to right of first lens
27 - 12.2 = 14.8 cm to left of second lens
i = 14.8 * 8.9 / (14.8 - 8.9) = 22,3 cm to right of second lens
Calculate the final velocity of m1=2kg with its velocity at 5m/s
The final velocity of the two objects after the collision is determined as 4 m/s.
Final velocity of the two objects after the collisionThe final velocity of the two objects after the collision is determined from the principle of conservation of linear momentum as shown below;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
where;
m1 = 2 kgu1 = 5 m/sm2 = 0.5 kgu2 = 0v = ?2(5) + 0.5(0) = v(2 + 0.5)
10 = 2.5v
v = 10/2.5
v = 4 m/s
The complete question is below:
A body of mass 2kg moving with velocity of 5m/s collides with a stationary body of mas 500g. if the two bodies move together after impact. Calculate the magnitude of their common velocity.
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1 Explain the work being done at the New Mexico Institute of Mining and Technology and why it is significant.
The New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
What is the New Mexico Institute of Mining and Technology?The New Mexico Institute of Mining and Technology is also known as New Mexico Tech and it refers to a public university that is located in Socorro, New Mexico.
Basically, the New Mexico Institute of Mining and Technology is a public university which is devoted to excellence in education, innovation and research, so as to advance engineering, science, and technology.
In conclusion, the New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
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What must be true in order for magnetism to induce an electric current in a wire?
Answer:
The wire must be part of a closed circuit.
Explanation:
A closed circuit in electric is what we called a wire that has a complete electrical connection in which electricity flows, where electric current flow from one end to another, in order for magnetism to induce an electric current the circuit has to be closed, or no current will flow.
Emma constructed a simple motor. When connected correctly, the coil of copper wire spins. Which of the following best describes the energy transformation that takes place between the paper clips and the spinning coil? undefined Question 4 options: Kinetic energy transforms into electrical energy. Chemical energy transforms into electrical energy. Electrical energy transforms into kinetic energy. Kinetic energy transforms into chemical energy.
Answer:
The first one. Kinetic to Electric
Explanation:
The wire is spinning which is Kinetic energy, and the energy is being transferred into electric.
Donald Trump has a mass of 108 kg, calculate his height when he is at the following heights (g=9.81 N/kg):
a) 20 J b) 1050 J c) 150 kJ
d) 120 J e) 2000 J f) 57 J
g) 1200 J h) 1 kJ i) 92 kJ
Answer:
(a)
Q=mgh
20=108×9.81×h
20=1059.48h
divide both side by 1059.48
h= 20/1059.48
h=0.02
(b)
1050= 108×9.81×h
1050= 1059.48h
h=1050/1059.48
divide both side by 1059.48
h=0.99
repeat the remaining following and check the answers
(c) h=0.14
(d) h=0.11
(e) h=1.89
(f) h= 0.05
(g) h=1.13
(h) h=0.94
(i) h= 86.84
note the (h) and (i) you need to change the kj to j by multiple by 1000
What is the velocity between the times t=3 to t = 4?
Answer:
The answer is t=4 + t=3=t=7
Select all the correct answers.
When people use plastic combs on their hair, the combs become negatively charged. Which statements about this situation are true?
The comb loses electrons.
The comb gains electrons.
The hair loses electrons.
The hair gains protons.
The hair loses protons.
Answer:
so therefore, the comb gains electron and the hair losses electrons
Explanation:
It is known that electron contain a negative charge.
So, when an atom gain electrons then number of electrons within the atom increases. As a result, the atom acquires a negative charge.
But when an atom loses electrons, there will be deficiency of electrons within the atom. As a result, the atom becomes positively charged.
Hence,, when people use plastic combs on their hair, the combs become negatively charged. The situation which is true about this is the comb gains electrons and the hair loses electrons.
Can anybody write a short poem about friction
Microwaves and gamma rays
- none of these.
- have the same wavelength.
- have the same color.
- have the same speed.
- have the same frequency.
Answer:
Have the same speed.
Explanation:
All electromagnetic waves travel at the same speed, which is 300,000,000 m/s.
Which of the following statements about postpartum depression is TRUE? Most cases of postpartum depression must be treated medically. Postpartum depression is very common. Postpartum depression is related to breastfeeding. Most women can work through severe postpartum depression on their own.
Answer:
Postpartum depression is very common
Explanation:
Common for ages 18-35
Postpartum depression: A mood disorder or depression that occurs in mothers after the birth of a baby. Usually this will be a short term disorder.
Postpartum depression is very common. The correct option is B.
Following childbirth, postpartum depression (PPD) is the most prevalent psychological disorder.
Postpartum depression (PPD) can affect one in seven women. The "baby blues" are a common postpartum condition for new mothers.
It is crucial to understand that postpartum depression is a serious problem that can have a substantial influence on mothers' and families' wellbeing.
In order to address and manage postpartum depression, it is essential to seek treatment and support from healthcare professionals.
Thus, the correct option is B.
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Your question seems incomplete, the probable complete question is:
Which of the following statements about postpartum depression is TRUE? A. Most cases of postpartum depression must be treated medically.
B. Postpartum depression is very common.
C. Postpartum depression is related to breastfeeding.
D. Most women can work through severe postpartum depression on their own.
Three metal fishing weights, each with a mass of 1.00x102 g and at a temperature of 100.0°C, are placed in 1.00x102 g of water at 35.0°C. The final temperature of the mixture is 45.0°C. What is the specific heat of the metal in the weights?
Answer:
Approximately [tex]0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex] assuming no heat exchange between the mixture and the surroundings.
Explanation:
Consider an object of specific heat capacity [tex]c[/tex] and mass [tex]m[/tex]. Increasing the temperature of this object by [tex]\Delta T[/tex] would require [tex]Q = c\, m \, \Delta T[/tex].
Look up the specific heat of water: [tex]c(\text{water}) = 4.182\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].
It is given that the mass of the water in this mixture is [tex]m(\text{water}) = 1.00 \times 10^{2}\; {\rm g}[/tex].
Temperature change of the water: [tex]\Delta T(\text{water}) = (45 - 35)\; {\rm K} = 10\; {\rm K}[/tex].
Thus, the water in this mixture would have absorbed :
[tex]\begin{aligned}Q &= c\, m\, \Delta T \\ &= 4.182\; {\rm J \cdot g^{-1}\cdot K^{-1}} \\ &\quad \times 1.00 \times 10^{2}\; {\rm g} \times 10\; {\rm K} \\ &= 4.182 \times 10^{3}\; {\rm J}\end{aligned}[/tex].
Thus, the energy that water absorbed was: [tex]Q(\text{water}) = 4.182 \times 10^{3}\; {\rm J}[/tex].
Assuming that there was no heat exchange between the mixture and its surroundings. The energy that the water in this mixture absorbed, [tex]Q(\text{water})[/tex], would be the opposite of the energy that the metal in this mixture released.
Thus: [tex]Q(\text{metal}) = -Q(\text{water}) = -4.182 \times 10^{3}\; {\rm J}[/tex] (negative because the metal in this mixture released energy rather than absorbing energy.)
Mass of the metal in this mixture: [tex]m(\text{metal}) = 3 \times 1.00 \times 10^{2}\; {\rm g} = 3.00 \times 10^{2}\; {\rm g}[/tex].
Temperature change of the metal in this mixture: [tex]\Delta T(\text{metal}) = (100 - 45)\; {\rm K} = 55\; {\rm K}[/tex].
Rearrange the equation [tex]Q = c\, m \, \Delta T[/tex] to obtain an expression for the specific heat capacity: [tex]c = Q / (m\, \Delta T)[/tex]. The (average) specific heat capacity of the metal pieces in this mixture would be:
[tex]\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{-4.182 \times 10^{3}\; {\rm J}}{3.00 \times 10^{2}\; {\rm g} \times (-55\; {\rm K})} \\ &\approx 0.253\; {\rm J \cdot g^{-1} \cdot K^{-1}}\end{aligned}[/tex].
a ship's sonar sends messages and receives the echoes from the ocean bottom 0.6 seconds after the sound is sent down from the ship.how Deep is the water beneath the ship? (Given speed of sound in still water = 1450m/s)
Answer:
Speed of Sound = 2D
Time
Where D is the depth of water
2D = Speed × Time
2D = 1450m/s × 0.6s
D = 1450m/s × 0.6s
D
Depth D = 870m
A modern automobile engine creates various harmful gasses, but much of the emissions end up being harmless—especially once the car has been running for about five minutes on a temperate day. Attached to the exhaust pipe of a car is a device consisting of platinum and palladium coated onto a ceramic surface (beads or a honeycomb shape). What would you guess is going on here? Why might the device only work well after a car has been running for a while? Assess how you think factors such as temperature, concentration and the presence of a catalyst affect the rate of a chemical reaction in this scenario.
The factors influencing the rate of chemical reaction are concentration of the reactant,Surface area and physical condition of the reactants, Temperature, and catalyst.
What is a chemical reaction?One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.
Following are the factors Influencing the rate of chemical reaction;
1. Concentration of the reactant.
The reaction is usually accelerated by increasing the concentration of one or more reactants. This occurs because a higher concentration of a reactant results in more collisions with that reactant in the same amount of time.
2. Surface area and physical condition of the reactants.
The pace of reaction is limited by the surface area of the in contact phases if reactant molecules reside in different phases, as in a heterogeneous mixture.
3. Temperature.
The rate of reaction is typically accelerated as the temperature rises. As the temperature rises, the average kinetic energy of the reactant molecules increases.
4. Catalyst
A catalyst is a substance that aids in the process without being ingested.
Catalysts provide a second reaction pathway for the production of goods. They play a crucial function in a variety of biological processes.
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What is the radius of the 5th orbital in hydrogen?
Answer:the radius of fifth Bohr orbital of hydrogen is 1.3225x10^-9
Explanation:
Let's see
According to bohrs model
[tex]\\ \rm\Rrightarrow r\propto n^2/Z^2[/tex]
[tex]\\ \rm\Rrightarrow r= r_on^2/Z^2[/tex]
[tex]\\ \rm\Rrightarrow r=0.529\times \dfrac{5^2}{1^2}[/tex]
[tex]\\ \rm\Rrightarrow r=0.529(25)[/tex]
[tex]\\ \rm\Rrightarrow r=1.32nm[/tex]
how does cool roofs help the co2?
Answer:
These cool down not only the house but even helps with the potential of canceling the heating effect of up to two years of worldwide carbon dioxide emissions. Which would over help the co2 rates.
Assuming momentum was conserved, Jimmy and Kevin and their roller coaster car do not appear to slow down at all. How is it that the momentum was conserved when the bug collided with Jimmy, but there was no apparent change in speed?
Owing to the fact that the speed of the cars did not change, the momentum of the objects will not change.
What is momentum?Momentum refers to the product of mass and velocity. According to the laws of conservation of linear momentum, momentum is conserved before and after collsion.
Owing to the fact that the speed of the cars did not change, the momentum of the objects will not change after collsion even thpough momentum is conserved.
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A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 35.80°. The indices of refraction for the blue and red components of the ray are: blue (ndiamond = 2.444, ncrown glass = 1.531), and red (ndiamond = 2.410, ncrown glass = 1.520). Determine the angle between the refracted blue and red rays in the crown glass.
Answer:
N1 Sin θ1 = N2 Sin θ2 Snell's Law
For blue light
Sin θ2 = N1 / N2 sin 35.8 = 2.444 / 1.531 * .5850 = .9339
θ2 = 69.04 deg
For red light
Sin θ2 = 2.410 /1.520 * .5850 = .9275
θ2 = 68.05 deg
The separation is .01 deg