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MissTica
3 years ago
14

A freight train is accelerating on a level track. The tension in the coupling between the engine and the first freight car would

change if some of the cargo in the last car were transfered to other cars?
Physics
1 answer:
rewona [7]3 years ago
6 0

Answer:

False

Explanation:

According to Newton's 3rd law, the tension between the engine and the 1st freight cars would equals to the force required to pull all the freight cars from the 1st one on ward. In addition, Newton's 2nd law states that the F = ma, which means that force is proportional to the mass of all the freight cars, given that the freight train is accelerating. So if some of the cargo in the last car were transferred to other cars, their total mass would stay the same, and so as force F and tension.

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Four copper wires of equal length are connected in series. Their cross-sectional areas are 1.6 cm2 , 1.2 cm2 , 4.4 cm2 , and 7 c
EleoNora [17]

Answer:

63.8 V

Explanation:

We are given that

A_1=1.6 cm^2=1.6\times 10^{-4} m^2

1 cm^2=10^{-4} m^2

A_2=1.2 cm^2=1.2\times 10^{-4} m^2

A_3=4.4 cm^2=4.4\times 10^{-4} m^2

A_4=7 cm^2=7\times 10^{-4} m^2

Potential difference,V=140 V

We know that

R=\frac{\rho l}{A}

According to question

l_1=l_2=l_3=l_4=l

In series

R=R_1+R_2+R_3+R_4

R=\rho l(\frac{1}{A_1}+\frac{1}{A_2}+\frac{1}{A_3}+\frac{1}{A_4})

R=\rho l(\frac{1}{1.6\times 10^{-4}}+\frac{1}{1.2\times 10^{-4}}+\frac{1}{4.4\times 10^{-4}}+\frac{1}{7\times 10^{-4}})

R=\rho l(18284.6)

I=\frac{V}{R}=\frac{140}{\rho l\times 18284.6}

Potential across 1.2 square cm=V_1=IR_1=\frac{140}{\rho l\times 18284.6}\times \rho l(\frac{1}{1.2\times 10^{-4}}=63.8 V

Hence, the voltage across the 1.2 square cm wire=63.8 V

3 0
3 years ago
Lisa traveled a total of 440 miles. Her trip took 8 hours. What was her average speed
zaharov [31]

Her average speed was 55MPH. Hope this helps!


8 0
3 years ago
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Larry and Balky set up an experiment to analyze the motion of a marble as it rolled down an incline. They started the marble at
VARVARA [1.3K]

Answer:

 Option B

Explanation:

The instantaneous velocity = Change in position/Time taken

The slope of the graph should give instantaneous velocity.

 Slope of a graph = Change in value of Y -axis / Change in values of X -axis

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   Change in value of Y -axis = Change in position

  Change in values of X -axis = Time taken

So position values should be on the Y axis and Time values should be on the X axis.

Distance on the y-axis and time on the x-axis.

So, option B is the correct answer.

3 0
2 years ago
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hich are made of matter? Check all that apply. air bicycles sound waves people clothes sunlight trees
Dominik [7]

I believe that air, bicycles, people, clothes and trees are matter however sound waves and sunlight are not. :)

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Answer:

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Explanation:

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