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A Carnot engine operates between the temperatures 490 K and 300 K. How much heat is discarded for the engine to produce 2500 J of work?
a 60kg diver jumps off a platform that is 10m above the surface of the water with an initial upward velocity of 3ms.
An empty storage tank has a volume of 144 ft3. What is the buoyant force exerted on it by the air
Two parallel square metal plates (side length: 13 cm) are separated by a dielectric material with a dielectric constant 3.9 and a thickness of 2.4 mm. Find the energy stored on the capacitor
Consider a vibrating piano string. The string is under a tension T, has a length L and diameter d. What is the frequency f' for the second string
An alpha particle, the nucleus of a helium atom, has a mass of 6.7*10-27 kg and a charge of 3.2*10-19C. It floats at rest above a charged horizontal sheet with uniform charge density on its surface.
A hiker walks 3.50 km at an angle of 45.0 degrees north of west. After that the hiker walks 1.5 km south. What is the magnitude and direction of hiker's totally displacement.
A balloon is filled with helium at a pressure of 2.3×105 Pa. The balloon is at a temperature of 14ºC and has a radius of 0.27 m. How many helium atoms are contained in the balloon
A 55 kg person running horizontally jumps into a 15 kg sled that is initially at rest. The velocity of the person and the sled as they move is 2.5 m/s. What is the velocity of the person before he jumped into the sled? What is the kinetic energy o..
Two strings equal in length and made of the same material are subjected to tensions
The sound level measured 5.2 m away from a jet engine is 140 dB. What is the intensity of the sound at 5.2 m? What is the power transmitted by the sound waves? At what distance is the sound level exactly half?
A long solenoid of length 40 cm, cross section area 24 cm^2 and 20 turns per centimeter carries a current of 8.0 A. find the magnetic energy stored in the solenoid
A fully suited astronaut name Bill lands on newly discovered plant (called New) and goes on an exploration walk on the surface. Bill returns by a different path and finds that to return, he must jump down a cliff of 15.0 m . He doesn't have time t..
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