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2 years ago

A force of 42N is needed to start a box sliding across the floor. The weight of the box is 55N.

Physics

2 answers:

Bezzdna [24]2 years ago

4 0

I think the right answer is c

GenaCL600 [577]2 years ago

3 0

Explanation:

It is given that,

Force applied to the box, F = 42 N

Weight of the box, W = 55 N

(a) Let f is the force of the friction acting on the box. The force of friction always opposes the motion of an object. It always equal to the applied force as :

f = -F = -42 N

(b) The frictional force is kinetic in nature because when the force is applied to the box it starts to move.

(c) Let $\mu$ is the coefficient of friction. It is given by :

$\mu=\dfrac{f}{N}$

$\mu=\dfrac{42}{55}$

$\mu=0.76$

Hence, this is the required solution.

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The gravitational force on the woman is A) 500 N

Explanation:

There are two forces acting on the woman during her fall:

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According to Newton's second law, the net force acting on the woman is equal to the product between the woman's mass and her acceleration:

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The net force can be written as

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Also, we know that the woman falls at a constant velocity (5 m/s), this means that her acceleration is zero:

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Combining the equations together, we get:

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which means that the magnitude of the gravitational force is equal to the magnitude of the air resistance:

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Learn more about forces and Newton's second law:

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2 years ago

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Answer:

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Answer:

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A quantity of a gas is an absolute pressure of 400 K PA in the absolute temperature of 110° Kelvin when the temperature of the g

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