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A young woman on a skateboard is pulled by a rope attached to a bicycle. The velocity of the skateboarded is v=(4.1 m/s) x and the force exerted on her by the rope is F=(17N)x + (12N)y. Find the work done on the skateboard by the rope in 25 seconds. Assuming the velocity of the bike is the same as that of the skateboarder, find the work the bike does on the bicycle in 25 seconds.
A large boulder rests on a cliff 500 m above a small village in such a position that, if it should slide off, What is the final impact velocity of the boulder
500 J of work are completed to compress the gas while, in the same process, 1400 J of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecules.
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a hot iron horseshoe(mass=0.50kg), which has just been forged,is dropped into 2.7 L of water in a o.45 kg iron pot initially at 22 degree celcius.If the final equilibrium temparature is 27 degree celcius, estimate the initial temparature of the hot..
A coil of inductance 110 mH and unknown resistance and a 1.4 ?F capacitor are connected in series with an alternating emf of frequency 980 Hz. what is the resistance of the coil
Two high-current transmission lines carry currents of 27.0 A and 80.0 A in the same direction and are suspended parallel to each other 35.0 cm apart. what magnetic force does each segment exert on the other
A string is wrapped around a pulley with a radius of 2.0cm. The pulley is initally at rest. What is the moment of inertia of the pulley
A satellite with a mass of 750 kg is in orbit around the earth. It is initially located at the altitude (measured from the earth's surface) of 2.12 x 106 m. It is then moved into a new orbit, with an altitude of 4.25 x 10^6 m (again, measured from..
The student sits on a pivoted stool while holding a weight ineach outstretched hand. The stool rotates about a verticalaxis through its center. Calculate the new angular speed of the system
an apparatus that liquefies helium is in a room maintained at 306 k. if the helium in the apparatus is at 4.0 k what is
a car driving on the turnpike accelerates uniformly from 84.0 ft/s (57.3 mph) to 112 ft/s (76.4 mph) in 3.60s. what is the cars acceleration
An object is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2
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