The earth has about 80 times the mass of the earth's moon.
The gravitational force exerted on the
moon by the earth has what relation to the
gravitational force exerted on the earth by the
moon?
1. 80 x
2. zero; the earth exerts a force on the moon,
but the moon is too small and too far away to
exert a force on the earth.
3. the same as
1
4.
Х
80

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:

compass can be used day and night, cloudy or sunny

i think it would be 5

did yall get answers for this yet