Someone presents you with a machine they have invented and tells you that the machine makes you stronger than you really are because it has a mechanical advantage of 1.0. will this machine really make you stronger?

a.)yes, a ma value of 1.0 indicates that the new invention makes you 100 times stronger than you really are.
b.)no, a ma value of 1.0 simply means that the output force is the same as the input force, and the machine does not make you any stronger at all.

volleyball players can not touch the net while the ball is in play

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: