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on a hot day a house is kept cool by an air conditioner. The outside temperature is 32 degrees celsius and the inside temperature is 21 degree celsius. Heat leaks into the house at the rate of 9000 kcal/h. if the air conditioner has the efficiency of a carnot engine, what is the mechanical power that it requires to hold the inside temperature constant.
A 2.90 m long, 320 kg steel beam extends horizontally from the point where it has been bolted to the framework of the new building under construction. A 66 kg construction worker stands at the far end of the beam.
Two large, non-conducting plates with the indicated area charge densities are suspended 3.67 cm apart, What volume of the air in region B (between the plates) stores an equal amount of energy
What minimumdistance are they from each other? The angle may be too large to use small angle approximation. suppose in units of m.
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
Two point charges 1.9cm apart have an electric potential energy -150?J . The total charge is 30nC
Mechanics: Center of Mass. A 60 kg woman and a 90 kg man stand 10.0 m apart on frictionless ice.
a bicyclist of mass 54 kg puts all his weight on each downward-moving pedal as he pedals up a steep road. determine the magnitude of the maximum torque he exterts in the process
Billy throws a ball straight up and it rises 22 meters into the sky. With what initial velocity must he have thrown the ball
A closed Gaussian cylinder sits centered around the z-axis and above the xy-plane with a length of A and a radius of R, What is the net charge contained in the cylinder
The length of the road up the hill is 347 m. Illustrate what should be the magnitude of F, so that the net work done by all the forces acting on the car is 182 kJ?
what was the initial speed of the bullet. find the heat that flows in 1.0 s through a lead brick 15 cm long if the temperature difference between the ends of the brick is 8.5 degrees celsius. the cross sectional are of the brick is 12 cm squared.
A beam of unpolarized light of intensity 12.o w/m^2 is incident on an ideal linear polarizer, P1, whose transmission axis is in the vertical (y) direction, What is the intensity of light emerging from P1
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