Auniform beam 4 meters long with a mass of 40 kg is mounted to a wall by a hinge as shown in the figure. a cable, which holds this beam in position, makes an angle of 30 degrees to the beam and is attached to the beam at a point 3 meters from the wall. this beam then holds up a sign from its end with a mass of 100kg. find the force of tension on the cable and the vertical and horizontal components of the force exerted by the hinge on the beam.

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:

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