show work please.. Part A: A child pulls on a wagon with a force of 75 N. If the

Question

show work please..

Part A: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 2.1 min, what is the average power generated by the child, in watts?

a) 31 W

b) 38 W

c) 25 W

d) 33 W

e) 19 W

Part B: A 0.14 kg baseball is thrown with a velocity of 36. 8 m/s. It is struck with an average force of 5000 N, which results in a velocity of 37 m/s in the opposite direction. How long were the bat and ball in contact?

a) 4.97 x 10^-3

b) 3.55 x 10^-2

c) 1.48 x 10^-2

d) 2.07 x 10^-3

e) 3.65 x 10^-3

Part C: A solid, uniform sphere of mass 2.0 kg and radius 1.7 m rolls without slipping down an inclined plane of height 2.9 m. What is the angular velocity of the sphere at the bottom of the inclined plane?

a) 4.4 rad/s

b) 7 rad/s

c) 6.3 rad/s

d) 2.9 rad/s

e) 3.7 rad/s

Explanation / Answer

A) power = F*velocity = 75*42/2.1*60 = 25W

B) Force = m(vf -vi)/t

so time = 0.14(37+36.8)/5000 = 2.07*10^-3

C) 0.5mv^2 = mgH

so v^2 = 2**9.8*2.9

so v= 7.53

so angular velocity = v/R = 7.53/1.7 = 4.43 rad/s

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