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3 years ago

A train on a straight track goes in the positive direction for 5.9 km, and then backs up for 3.8 km

Physics

1 answer:

kenny6666 [7]3 years ago

6 0

Answer:

2.1km

Explanation:

Ill take it as u are talking about the displacement

Since displacement has negatives and positves

5.9 - 3.8 = 2.1km

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2 years ago

You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of 252 N in the negative x di

pentagon [3]

(a) 252 N, opposite to the applied force

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- the pushing force of 252 N, F, forward

- the frictional force, Ff, pulling backward

In this case, the refrigerator is not moving: this means that its acceleration is zero. According to Newton's second law, this also means that the net force acting on the refrigerator is also zero:

$\sum F = ma = 0$

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(b) 334.8 N

The force that must be applied to the refrigerator to make it moving is equal to the maximum force of friction, which is given by:

$F_{max} = \mu mg$

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$\mu = 0.61$ is the coefficient of static friction

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3 years ago

which measurment describes the amount of heat needed to raise the temperature of one gram of a material by one degree celsius?

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<u>Answer:</u>

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