13)(pr) A van of mass 1055 kg sits at rest at a stop sign. A car of mass 715 kg travels with a speed of 2.25 m/s just before it rear-ends the van. Assume that the van is free to move following the collision (transmission is in neutral, no brakes being applied), and the collision is elastic. (See PSL 9.8.) a) Determine the final velocities (magnitudes and directions) of both vehicles. b) Verify that the total KE before the collision is equal to the total KE after the collision (as it should be for an elastic collision).

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:

power out to power in less than 100%