Blocks with masses of 7.0 kg, 8.0 kg, and 9.0 kg are lined up in a row on a frictionless table. all three are pushed forward by a 20 n force applied to the 7.0 kg block.

1. ) how much force does the 8.0 kg block exert on the 9.0 kg block?

2.) how much force does the 8.0 kg block exert on the 7.0 kg block?

7.497 N

14.161 N

Explanation:

m = Mass

a = Acceleration

Force is given by

For the 9 kg block

The force on the 9 kg block is 7.497 N

Here m = 8+9 = 17 kg

The force on the 7 kg block is 14.161 N

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:

i think it's 35 meters