9) Which combination of statements is most accurate? [Enter your answer as a str

Question

9) Which combination of statements is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE". NOTE: There are only 5 tries for this problem.]

A) Increasing the separation between two massive objects increases the GPE of the objects.
B) Steadily lowering a ball to the ground decreases GPE while increasing the ball's KE due to energy conservation.
C) Energy conservation means that if a system is isolated, its KE and GPE always transform into each other.
D) Energy conservation implies that the momentum of a system is conserved.
E) None of the above

Explanation / Answer

A)

GPE = G*M1*M2/R

Increasing R will decrease GPR

So, A is false

B)

GPE = m*g*h

as h decreases, GPE decreases.

Since GPE decreases, KE increaeses as per conservation foe energy.

So, B is true.

C)

This is correct

D)

momentum of a system is conserved is conservation of momentum. This is not conservation of enrgy.

So, D is false

Answer: BC

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