- #1

Northstar

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1) A 3.5 kg flowerpot drops from a tall building. The initial speed of the pot is zero, and you may neglect air resistance.

After the pot has fallen 33 m, it enters a viscous liquid, which brings it to rest over a distance of 1.5 m. Assuming constant deceleration over this distance, what is the magnitude of this deceleration?

I found the force to be 215.56 (I know this is correct).

Now, here's the part I can't figure out:

What is the force exerted on the liquid by the pot?

I did F = ma but that was not the correct answer. What did I do wrong?

2) A block of mass M = 15 kg is suspended at rest by two strings attached to walls, as shown in the figure. The left string is horizontal and the right string makes an angle theta = 50° with the horizontal. What is the tension in the left string?

3) A 0.6 kg sphere hangs on a string from the ceiling of an automobile. The car has a constant horizontal acceleration and the string is displaced an angle θ = 65.2° from the vertical. To a person sitting inside the car, it appears that the sphere is motionless (the angle between the sphere and the vertical is constant). What is the magnitude of the acceleration of the car?

Thanks for any and all help.