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The low temperature in a freezer is -20 C, and the discharge temperature is 35 C. What is the maximum theoretical coefficient of performance?
At the top of a 30m hill is a 5kg mass. It is loaded into a spring cannon. what was the gravitational potential energy of the mass with respect to the bottom of the hill
Two comets, each of mass 6500 kg and traveling 95 m/s in opposite directions, collide head-on and come to rest. How much energy is produced in this collision
find the moment of inertia about the z axis of the hemispherical shell of z= (2^2-x^2-y^2)^(1/2), derive the unit normal vector for surfaces given by y=g(x,z_ x=h(y,z)
An open organ pipe 0.750 {\rm m} long has its first overtone at a frequency of 441 {\rm Hz}. What is the temperature of the air in the pipe
Suppose a 1.5 kg watermelon is hung from a string. A bolt with a mass of 30 grams is shot into the watermelon. Find the speed of the watermelon immediately after the arrow exits
A Carnot engine extracts 950J from a 600K reservoir during each cycle and rejects 480J to a cooler reservoir. It operates at 22 cycles per second. Find the work done during each cycle
A bicyclist on a horizontal plane starts from rest and begins to pedal. The wheel of radius r = 0.345m has a constant angular acceleration of ? = 9.35rad/s2, What is the final angular velocity of the wheel
At an outdoor market, a bunch of bananas attached to the bottom of a vertical spring of force constant 16.0 N/m is set into oscillatory motion with an amplitude of 20.0 cm, What is the weight of the bananas in newtons
When yellow sodium light, ?=589nm, falls on a diffraction grating, its first-order peak on a screen 55.0cm away falls 3.29cm from the central peak. What is the wavelength of the new source
Point charges of -8.20 micro Coulombs are placed at each corner of a square that is 0.250m on a side. Find the electric potential at the center of a square
A magnetic field and an electric field, in separate regions of space, have strengths of 1.25 T and 1.25 N/C, respectively. What is the energy density of the magnetic field
Although there are many mechanisms that help large mammals (such as elephants) keep cool in hot climates, the size of ears is a big factor. estimate the relative temperature difference between the territory of African elephants versus the territory ..
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