-/2 points MI3 7.10.x·057 My Notes (a) A box with its contents has a total mass

Question

-/2 points MI3 7.10.x·057 My Notes (a) A box with its contents has a total mass of 30 kg. It is dropped from a very high building. After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box? (b) The box survived the fall and is returned to the top of the building. More objects are put into the box, and the box with its contents now has a total mass of 90 kg. The box is dropped, and it reaches a higher terminal speed than before. After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box? (The fact that the heavier object reaches a higher terminal speed shows that the air resistance force increases with increasing speed.) -/1 points My Notes The fact that the spring potential energy function depends only on the positions of the ends of the spring tells us that the spring force must be a(n) force o positive o conservative o oscillating o peculiar o simple harmonic

Explanation / Answer

The idea is that at terminal speed the falling object is not speeding up any more -- it has zero acceleration, so the forces on it must sum to zero net force.

That means the air resistance force must balance the weight of the box, i.e. F = mg

(a)

F = mg = (30)(9.81) = 294.3N

(b)

F = mg = (90)(9.81) = 882.9N

_______

2nd qs

Ans: simple harmonic

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