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A 44-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 160 J from 420 J. How high does she rise during this interval? Neglect air resistance.
A bicycle racer is going downhill at 12.2m/s when, to his horror, one of his 2.42kg wheels comes off when he is 75.0m above the foot of the hill. How much total kinetic energy does the wheel have when it reaches the bottom of the hill
A 10-A current flows for two minutes. How much charge has passed through this circuit
two small plastic balls hang from threads of negligible mass. each ball has a mass of 0.14 g and a charge of magnitude
a rocket of mass 4.5 x 105 kg is in flight. its thrust is directed at an angle of 53.0deg above the horizontal and has
At a rock concert, a dB meter registered 130 dB when placed at a2.8 m in front of a loudspeaker on the stage. (a) what was thepower output of the speaker assuming uniform spherical ofthe sound and neglecting absorption in the air?(b) how far awaywoul..
1. a pulley of radius 0.3 m is rotating counter-clockwise and is pulling a weight upward. the weight slows the spinning
Capacitors C1 = 5.04 uF and C2 = 2.05 uF are charged as a parallel combination across a 286 V battery. Calculate the resulting charge on capacitor C2
A tank is 2m above the connection to the water controls. The water then travels up a vertical pipe to the shower head 3.5m above the water controls. Determine the water pressure at the shower controls
In a serious accident, a nuclear power plant%u2019s reactor vessel cracks, and all of the cooling water drains out. how much energy will it take to melt the core
A rectangular loop is located in a uniform magnetic field of magnitude 0.31 T directed perpendicular to the plane of the coil. what is the magnitude of the emf induced in the coil
A 12.0 g bullet is fired horizontally into a 100 g woodenblock that is initially at rest on a frictionless horizontalsurface and connected to a spring having spring constant 150 N/m. what was thespeed of the bullet at impact with the block
A certain camera lens has a focal length of 147 mm. Its position can be adjusted to produce images, Over what range of object distances is the lens useful
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