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(a) A reversible heat pump is used to maintain a temperature of 0c in a refrigerator when it rejects the heat to the surroundings at 25c. If the heat removal rate from the refrigerator is 1440 kj/min, determine the C.O.P. of the machine and work input required.
(b) If the required input to run the pump is developed by a reversible engine which receives heat at 380c and rejects heat to atmosphere, then determine the overall C.O.P. of the system.
A certain lightbulb has a tungsten filament with a resistance of 18.9 ? when at 20.0°C and 139 ? when hot. Find the temperature of the hot filament
A charge of -3.00 µC is fixed at the center of a compass. Twoadditional charges are fixed on the circle of the compass (radius =0.100 m). The charges on the circleare -3.90 µC at the position duenorth and +5.00 µC at the position due east.
A small rock with mass 0.200 kg is fastened to a massless string with length 0.750 m to form a pendulum. What is tension in the string at the lowest point
Calculate the moment of inertia and the rotational kinetic energy for the following objects spinning about a central axis
A Metra train is moving at a speed of 25.0 m/s. As it approaches astation its horn emits a sound of frequency 750. Hz. Calculate the frequency detected by a personstanding still at the station.
A piano wire with mass 2.90g and length 82.0cm is stretched with a tension of 35.0N. Calculate the average power carried by the wave
At a certain point in a horizontal pipeline, the water's speed is 4.00{\rm m/s}, Find the gauge pressure at a second point in the line
A nail gun fires a nail into a piece of wood. The nail is going a velocity of 9.0 m/s right before entering the wood. The mass of the nail is 0.060 kg, how far into the wood does the nail go
Two cylindrical bars, each with diameter of 2.40 cm, are welded together end-to-end. One of the original bars is copper and is 0.350 m long. The other bar is gold and is 0.135 m long. What is the resistance between the ends of the welded bar at 20 oC..
An uncharged nonconductive hollow sphere of radius 11.0 cm surrounds a 16.0 µC charge located at the origin of a cartesian coordinate system. A drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. Calculate..
The gravitational acceleration of bodies dropped near the Moon's surface is about 1.6 m/s^2. Find the time for an object dropped from rest to fall 3.0m on the Moon Find the time for an object dropped from rest to fall 3.0m on Earth.
approximately how far does it move while stopping? Express your answer to one significant figure and include the appropriate units.
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