A block of mass 2 kg slides on a frictionless loop the looped track. The block is released from a height of 3.7 m. The looped track has a radius of 0.8 m. (A) What speed does the block have at the bottom of the loop?
(B.) What speed does the block have at the top of the loop?
(C.) What Normal force does the block experience at the top of the loop?
(D.) What minimum height above the ground must the block be placed to make it around the loop without it falling?

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:

we need to know the time interval during which the force acts. impulse of force = momentum change

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19