Afeather is dropped onto the surface of the moon. how far will the feather have fallen if it reaches the surface in 9.00 seconds? given: g on moon = –1.63 meters/second2 a. 14.0 meters b. 14.7 meters c. 16.00 meters d. 66.0 meters

The feather's vertical position is determined by

We take the feather's starting position to be the origin, and the downward direction to be positive. Then

so the answer is D.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.