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Through a cycle, a heat engine receives 2.78×104 J of heat from the hot reservoir and gives up 1.83×104 J of heat to the cold reservoir. (a) What is the net work performed through one cycle? Make sure to include the correct sign. (b) Is work done on the system, or does the system do work on its surroundings?
In a dream, you find yourself pushing a huge boulder up a verysteep (35 degree) hill that is 75 meters high. The boulder weighs22,000 N. Assume that the force needed on flat ground is zero.
A child in a boat throws a 5.80-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 23.0kg and the mass of the boat is 35.0kg. Compute the velocity of the boat immediately after, assuming it was initially at rest.
on a hot summer day(30 degrees celsius),a pesky little mosquito produced its warning sound near your ear. what is the frequency in hertz of the sound wave
question1a small asteroid of mass 2.6e9 kg is revealed travelling at a speed of 18kms on a direct heading for starbase
An 11 kg monkey climbs up a mass less rope that runs over a frictionless tree limb and back down to a 21 kg package on the ground. What is the magnitude of the least acceleration the monkey must have in order to lift the package off the ground? Assum..
A child sitting 1.20 from the center of a merry-go-round moves with a speed of 1.65. Calculate the net horizontal force exerted on the child
A pine cone falls from a tall tree. It takes 0.2 seconds to pass by a 2 meter tall window, i.e.the time between when it' s visible at the top of the window, How high above the window was it at its starting point
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.40 x 105 N. What is the work done on the jet by the catapult
A 1000-kg rocket has a net propulsion force of 80 kN (kiloNewtons). Over a short time period, it uniformly speeds up from an initial velocity of 35 m/s to a final velocity of 60 m/s. What is the net work done on the rocket in kil
The speed v of sound waves in air depends on the atmospheric pressure P and density r of the air. By using the method of dimensional analysis, find an expression for v in terms of P and r.
The label on a commercially purchased radioactive sample gives its activity as 16 µCi. The half-life of the sample is 60 days. How old is the sample
A 8cm radius disk with a rotational inertia of .12kgm^2 is free to rotate on a horizontal axis. A string is fastened to the surface of the disk and a 10kg mass hangs from the other end. The
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