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Author Question: A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories). Another ... (Read 77 times)

Yi-Chen

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A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories). Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm.
 
  How many repetitions of this exercise are equivalent to 10 minutes of running in place? Assume that the person uses negligible energy in letting down the weights after each lift. (1 cal = 4.186 J)
  A) 730 B) 2900 C) 1450 D) 2200 E) 1500

Question 2

A satellite, initially at rest in deep space, separates into two pieces, which move away from each other. One piece has a rest mass of 190 kg and moves away with a speed 0.500c,
 
  and the second piece has a rest mass of 250 kg and moves in the opposite direction. What is the speed of the second piece?
  A) 0.500c B) 0.402c C) 0.212c D) 0.473c E) 0.380c


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elyse44

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Yi-Chen

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Reply 2 on: Jul 29, 2018
Excellent


phuda

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

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