According to newton’s third law of motion, which are equal?
momentum and velocity
collision time and stop time
mass and momentum
action force and reaction force

Action force and reaction force

Explanation:

According to newton's third laws of motion, the action of a body is always associated with the reaction of the other body.

But these two forces don't act on the same body.

For example,

If a man hits on the wooden board with his fist, he exerts a certain amount of force on the surface of the board. Consider it as action force dented by 'Fa'.

The wooden board exerts a similar force that is equal in magnitude but in the direction opposite to the applied force on his fist. Consider it as action force dented by 'Fr'.

In both cases, the force is acting on different bodies. It is mathematically expressed as

                                  Fa = - Fr

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: