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a 10 kg sled slides down a snowy hill. At position A it is moving at 1.00 m/s when it reaches position B it is moving at 3 m/s. Finally it passes position C moving at 1.00 m/s again. Position C is 3.00 m lower than position A and 1.00 m lower than position B. The coefficient of kinetic friction varies from place to place in the snow. What is the work done by friction on the sled as it moves from A to C?
Light of a wavelength 450 nm is incident on a sodium emitter in a photoelectric effect apparatus. What is the cutoff frequency for the emitter
Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. How high up is Bob, if the ball started from exactly 2 m above the edge of the cliff
A patient is having a magnetic resonance imaging scan (an MRI) and has neglected to remove a circular, metallic bracelet. the resistance of the bracelet is .0123 ohm. what is the area of the opening of the circular bracelet
Define the velocity and the potential energy of an object briefly.
A body is thrown vertically upward. when it passes a point H above its starting point, its velocity is 1/3 its initial velocity. How high does it rise above its starting point
A 539 Hz sound wave travels through a substance. What is the speed of sound in the substance
A tuning fork with a frequency of 440 Hz is held just above the top of a uniform glass tube containing water. What is the speed of sound in air
One mole of an ideal diatomic gas is heated from a temperature of 22 degrees C to a temperature of 95 degrees C. How much heat in joules must be supplied if the volume is kept constant during heating?
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. How much charge moves during this time
A 10cm-diameter disk emits light uniformly from its surface. 20rm cm from this disk, along its axis, is an 8.0cm-diameter opaque black disk, What is the diameter of the completely dark part of this shadow
A light spring-gun projectile launcher is mounted on an .443 kg air track glider. find the speed of the air-track glider after the gun is fired
A 1.5kg rock is whirled around in a flat circle at the end of an 85cm string. It has a linear speed of 1.80 m/s. What is the centripetal force that is acting on the rock
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