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The force of air resistance on a raindrop is 5 x 10^-5 N when it falls with a terminal velocity of 4.2 m/s.

The acceleration of gravity is 9.8 m/s2.

What is the mass of the raindrop? Answer in units of kg.

How would I do this question? My understanding is to divide the Force of air resistance on a raindriop by the acceleration of gravity to get the mass of the raindrop.

and the other question is,

#2.

007 (part 1 of 2) 5 points

A block weighing 6.9 N requires a force of 2.4 N to push it along at constant velocity.

What is the coefficient of friction for the surface?

I'm new to friction so I don't know what to do here..

Any ideas would be appreciated. :)

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# Homework Help: Force Problems.

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