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A thermoelectric refrigerator removes heat from a refrigerated space at -5°C at a rate of 130 W and rejects it to an environment at 20°C. Determine the maximum coefficient of performance this thermoelectric refrigerator can have and the minimum required power input.
a metal cylinder which has length l and a resistance of 4 ohms is melted down to form a new cylinder with twice the
The electric field near the surface of a uniformly charged conducting plane can be determined by Gauss's law (look it up). what is the magnitude of the electric field near the surface
Two cannons are pointed directly towards each other, (one on the ground pointing upwards, A, second on a hill pointing downwards, B. both pointing at each other). When fired, the cannonballs will follow the trajectories, crossing each other’s path, i..
An airplane must reach a speed of 377mi/h in order to take off. If the runway is 403 m long, what is the minimum value of the acceleration that will allow the airplane to take off successfully.
A charge of -8.0 nC is uniformly distributed around a ring of radius 1.3 m that lies in the yz plane with its center at the origin. Calculate the work done in moving the point charge to the origin
determine the time the inhabitants of alpha station. A woman who weighs 600N at earth's surface stands on top of a very tall ladder so she is one earth radius above earth's surface. how much does she weigh.
A spy satellite uses a telescope with a 2.4-m-diameter mirror. It orbits the earth at a height of 240km . What minimum spacing must there be between two objects on the earth's surface if they are to be resolved as distinct objects by this telescop..
A microwave oven generates electromagnectic waves of frequency2.45 GHz. The microwaves enter the oven and are reflected by the walls. Calculate the speed of the micro waves from these data
A 4.0m deep swimming pool measures 28m by 11m. It's filled with fresh water. What force does the water exert on the bottom of the pool
A vertical jet of water having a nozzle exit velocity of 15 ft/s with a diameter of 1 in. suspends a hollow hemisphere as indicated in Fig. P5.56. If the hemisphere is stationary at an elevation of 12 in., determine its weight.
At what distance along the central axis of a uniformly chargedplastic disk of radius R = 1.40 m is themagnitude of the electric field equal to 1/9 times the magnitude of the field at the center of the surface of the disk?
You dip your finger into a pan of water twice each second,producing waves with crest that are separated by 0.11 m. Determine the frequency of these waves
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