UESTION THREE a) Briefly explain what is meant by moment of a force.
[2 marks]
b) A uniform wheel of centre 0, 600mm diameter and weighing 5kN is being rolled
along a horizontal concrete into a workshop, then jams on a rigid rectangular block of
height 150mm as shown in Fig 02 below.
600
P
1501
Fig 02
Determine the magnitude of the minimum horizontal force P required to pull the
wheel over the block.
16 marks)​

the answer is I dont know ;-)

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:

umm yea she did enjoy it cause shes evil can u be more spasific i don even think thats a