In being served, a tennis ball is accelerated from rest to a speed of 31.6 m/s. The average power generated during the serve is 2920 W. Assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.

When a tennis ball is accelerated from rest to 31.6 m/s, a 92.4 N force generates a power of 2920 W.

In being served, a tennis ball is accelerated from rest (u = 0) to a speed of 31.6 m/s (v).

The average power (P) generated during the serve is 2920 W. We can relate the power to the work done (W) and the time elapsed through the following expression.

  [1]

Another way to express work is through its relation with the applied force (F) and the distance traveled (d).

  [2]

If we substitute [2] in [1], we get,

And d/t = v. Then,

When a tennis ball is accelerated from rest to 31.6 m/s, a 92.4 N force generates a power of 2920 W.

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The force acting on the ball is 92.4 N.

Explanation:

Given that,

Initial speed of the ball, u = 0

Final speed of the ball, v = 31.6 m/s

The average power generated during the serve is 2920 W. Power generated by an object is given by :

W is the work done, W = Fd

Since,

So,

F is the force acting on the ball

So, the force acting on the ball is 92.4 N. Hence, this is the required solution.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.