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Author Question: A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its ... (Read 32 times)

penguins

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on: Jul 28, 2018
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
 a. -14 J
  b. -12 J
  c. -10 J
  d. -16 J
  e. -25 J

Question 2

Two masses, MA and MB, with MB = 2MA, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen for equal times, we find that
 a. KB = KA.
  b. KB = 2KA.
  c. KB = 4KA.
  d. KA = 2KB.
  e. KA = 4KB.


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Kdiggy

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Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


penguins

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Reply 2 on: Jul 28, 2018
Wow, this really help

juliaf

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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