Explain how work is done when a ball impacts with the ground.

answer:

Explanation:

depends on the floor, the ball, and the speed

answer: When the object falls to the ground, it gives up its energy in the form (largely) of heat. The energy released when it hits the ground should nicely balance the energy gained during the ride upward. Since force is absent during the fall, there's no work and no violation of any principal in physics. When it hits the floor it has no potential energy, but lots of kinetic energy. Another interesting thing happens when the ball hits the floor. Remember that the ball bounces back up to a height lower than it started, so after one bounce it has less potential energy than it started with.

answer: i pick a

explanation:

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: