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The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 20.0 m/s at an angle of 66.0 ° above the ground, what is the "hang time"?
A loudspeaker receives 8.0 W of power from an audio amplifier, and turns 3 % of that power into sound waves. What is the decibel intensity at this distance
A small sphere of mass m = 6.10 g and charge q1 = 29.2 nC is attached to the end of a string and hangs vertically. A second charge of equal mass and charge q2 = 58.0 nC is located below the first charge a distance d = 2.00 cm below the first charg..
Calculate the force a piano tuner applies to stretch a steel piano wire 7.70 mm, if the wire is originally 0.850 mm in diameter and 1.30 m long
Their motions have equal periods, but the radius of skater A's circle is half that of skater B's circle. Evaluate the ratio of the magnitudes of the forces acting on each skater?
The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. How many electrons, ne, has the filament lost
A 50 kg child takes a ride on a roller coast . the coaster maintains a constant speed of15 m/s as it moves around a loop of radius 10m. what is the centrupetal acceleration of the child
You have a small electromagnet that consumes 300 W from a residential circuit delivering 120 V at 60.0 Hz. find the internal resistance of the electromagnet
50j of work are done per cycle on a refrigerator with a coefficient of performance of 5.0. Part A: How much heat is extracted from the cold reservoir per cycle
A helicopter lifts a 72 kg astronaut 15 m vertically from the ocean by means of a cable. How much work is done on the astronaut by the force from the helicopter
An object of mass 2.5 kg on a table is connected to a hanging object of mass 11.2 kg by means of a string via a pulley. Caculate the acceleration of the system
A 240 kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, each having a 1.20, Calculate the power dissipated by 100 of them.
A person exerts a force of 120N on a rope that pulls a sled across a very smooth surface. The rope is oriented 37 degrees above the horizontal. Determine the speed of the sled after moving for 10 m
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