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  21. A shot-putter moves his arm and the 7.0-kg shot

Question :   21. A shot-putter moves his arm and the 7.0-kg shot : 2102102

 

21. A shot-putter moves his arm and the 7.0-kg shot through a distance of 1.0 m, giving the shot a velocity of 10 m/s from rest. Find the average force exerted on the shot during this time.

A. 175 N

B. 350 N

C. 525 N

D. 700 N

22. A baseball batter hits an incoming 40-m/s fastball. The ball leaves the bat at 50 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15-kg baseball?

A. 450 N

B. 250 N

C. 90 N

D. 50 N

23. In the terminology a 500-N block, the 500-N refers to the block's:

A. mass.

B. force.

C. weight.

D. None of the above.

24. The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?

A. first

B. second

C. third

D. fourth

25. A thrown stone hits a window, but doesn't break it. Instead it reverses direction and ends up on the ground below the window. In this case, we know:

A. the force of the stone on the glass > the force of the glass on the stone.

B. the force of the stone on the glass = the force of the glass on the stone.

C. the force of the stone on the glass < the force of the glass on the stone.

D. the stone didn't slow down as it broke the glass.

 

Solution
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Physics 1 Year Ago 103 Views
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