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A constant current of I = 15 A exists in a solenoid whose inductance is L = 42.2 H. The current is then reduced to zero in a certain amount of time.
(a) If the current goes from 15 to 0 A in a time of 75 ms, what is the emf induced in the solenoid?
(b) How much electrical energy is stored in the solenoid? (Consider the initial energy stored.)
(c) At what rate P must the electrical energy be removed from the solenoid when the current is reduced to 0 A in a time of 75 ms? Note that the rate at which energy is removed is the power.
From another measurement, you have found that velocity of the jumper's center of mass has only a y component of v2=2.5 m/s as the jumper's feet leave the floor.
A 55.6 kg child slides down a water slide with a velocity of 0.9 m/sec at the top. At the bottom of the slide, she is moving horizontally, y=1.5 meters above the water. She splashes into the water d=2 meters to the left of the bottom of the slide.
An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, compute the change in the box's kinetic energy.
A chocolate bar (40grams) has 210 Calories. Approximately how long would the 100 watt light bulb shine if we convert all the chocolate's energy into electricity (100% efficiently)? (Remember 1Cal = 1000 cal = 4200 joules)
If a 200 N force F1 is applied to the piston with the 4 cm diameter, Calculate the magnitude of the force F2 that can be resisted by the piston with the 10 cm diameter? Ignore the weights of the pistons.
A 4.0-kg object has a velocity of 4.0 m/s headed east. An explosion causes it to break up into two smaller 2.0-kg objects. what is the velocity of the other object after the explosion
A 175-g object is attached to a spring that has a force constant of 72.5 N/m, Find the locations of the object when its velocity is one-third of the maximum speed
A boy throws a 1.5 kg rock upward. To do so the boy applies a constant 38.5 N force upwards on the rock from point a to point b. after that the rock continues upward to its highest height at point c.
The car has just achieved double its initial velocity when the driver spots a police officer behind him and applies the brakes. The car then slows down, coming to rest at the stoplight ahead.
Calculate escape velocity for an object started at the surface of the earth, going straight up. Neglect any complications due to the earth turning.
the driver of a train moving at 20 m/s applies the brakes when it passes an amber signal. Find the train's acceleration and its speed at the next signal
A block whose weight is 41.0 N rests on a horizontal table. A horizontal force of 36 N is applied to the block, what will be the block's acceleration? (If not, enter 0.)
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