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Question: A pitcher warms up by throwing a baseball to the catcher at 45 mph; this means it has a kinetic energy of about 30J. During the game he throws a fastball at 90mph. What is its kinetic energy then?
A circular coil of 70 turns and a radius of 5 cm is placed with its plane oriented at 90 degrees to a magnetic field of 0.1 T. The field is now increased at a steady rate, reaching a value of 0.7 T after 2 seconds. What EMF is induced in the coil?
A flight attendant pulls her 63N flight bag a distance of 312m along a level airport floor at a constant velocity. The force she exerts is 39N at the angle of 59° above the horizontal.
A running back with a mass of 82 kg and a velocity of 9 m/s (toward the right) collides with, What is the velocity of the tackle before the collision
Two 10.0 cm -diameter electrodes 0.52 cm apart form a parallel-plate capacitor. What is the electric field strength inside the capacitor after insulating handles are used to pull the electrodes away from each other until they are 1.3 cm apart
A 0.285-kg volleyball approaches a player horizontally with a speed of 14.0 m/s, What impulse is delivered to the ball by the player
The spring is now pulled down an additional distance x and released from rest. What is the period of oscillation for the mass?
a current of 0.307 a through your chest can send your heart into fibrillation ruining the normal rhythm of heartbeat
After leaving the end of a ski ramp, a ski jumper lands downhill at a point that is displaced 55 kilometer horizontally from the end of the ramp. evaluate his initial velocity (magnitude and direction) when he left the end of the ramp
A 13.5uF capacitor is connected to a power supply that keeps a constant potential difference of 26.0V across the plates. How much energy is stored in the capacitor before the dielectric is inserted
Two 140 kg lead spheres are suspended from 200 m-long massless cables. By what distance (in meters) do the two spheres move closer
Find out the friction force on the box
0.60 kg rubber ball has a speed of 2.30 m/s at point A and kinetic energy of 8.3 J at point B. (a) Determine the ball's kinetic energy at A (b) Determine the ball's speed at B (c) Determine the total work done on the ball from A to B
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