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Alborosie
3 years ago
6

how would the velocity of the book change if the applied force were equal to the sliding friction force

Physics
1 answer:
Inessa [10]3 years ago
3 0
Yes, Sliding friction opposes the movement of the book, slowing it down.sliding That's the 'kinetic' kind.. According to Newton's second law, F=ma. That is, the bear's acceleration should be proportional to the total force acting on the bear. As the bear's velocity is constant, its acceleration is zero. Therefore, the total Force acting on the bear is zero. Thus, the friction has to be equal in magnitude and opposite in direction to the bear's weight. As W=mg, we get that its weight is  <span>9.8*400=3,920 Newton. Thus, the friction acting on the bear is 3,920 Newton</span>
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<h2>Explanation:</h2>

The change in internal energy (ΔE) of a system is the sum of the heat (Q) and work (W) done on or by the system. i.e

ΔE = Q + W       ----------------------(i)

If heat is released by the system, Q is negative. Else it is positive.

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Q = -0.659kJ = -695J    [Q is negative because heat is removed from the system(balloon)]

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<em>Substitute these values into equation (i) as follows;</em>

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<em />

<em />

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