A35kg crate slides across floor which experts a 110n friction force on it. what horizontal force is required to move the crate at a steady speed across the floor.

The froce needed is 110 N

Explanation:

We need to make and sketch of the crate and the forces acting on it.

Since the movement is a constant velocity there is no acceleration, therefore, Newton's second law m*a = 0.

And from the equation deducted, we can appreciate that the opposite force to the friction force is the one that it's needed to move the crate at constant velocity.

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: