A game show contestant won a prize by pushing a bowling ball 20 m using her nose

Question

A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball? Carlos does a chin-up in gym class and raises himself 08 m I Carlos has a mass of 62 kg, how much work does he accomplish? If he completes this task in 5 seconds, how much power does he generate? (Remember, mass s not a force!) Energy & Work -03 A football player picks up the football, runs with it, and throws c it to a teammate. During which of these actions is work being done on the football? Explain On the diagram of the pendulum. Identify the position of maximum kinetic energy with the letter "P". Identify the position maximum kinetic energy is increasing with the letter "K". Identify the position where kinetic energy is increasing with the letter T. Identify the position where the kinetic energy is decreasing with the letter "D". Imagine dropping a soccer ball. The first bounce will be highest, and each bounce after that will be lower until the ball stops bouncing. Describe the energy changes that take places and explain how energy is conserved.

Explanation / Answer

1.

Work = force*displacement*cos A

cos A = 0, because angle between force and displacement is zero

W = F*d

F = W/d = 1470/20 = 73.5 N

2.

Work done by gravity = mgh

m = 62 kg

h = 0.8 m

W = 62*9.81*0.8 = 486.57 J

Work = power*time

power = P = W/t

P = 486.57/5 sec = 97.31 W

3.

In picking up the football work is done by gravity.

work done by gravity on football = mgh

h = hight of football after picking

in throwing the football work is done by man.

direction of force and distance will be parallel.

Let me know if you have any doubt.

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