A feather, a tennis ball, and a bowling ball are dropped from a high tower on the moon's surface. Which object hits the ground first?
A. All three reach the ground at the same time.
B. The feather, because it's the lightest
C. Both the tennis ball and the bowling ball reach the ground at the
same time.
D. The bowling ball, because it's the heaviest

In the absence of air resistance. I think no. D ) The bowling ball.

Hope this helps...

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: