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A freezer has a coefficient of performance of 5. It converts 1.5 kg of water at room temperature into ice at 25 μF within 20 minutes.
(a) How much electrical energy is consumed in the process and at what power does the refrigerator operate?
(b) How much heat is released into the environment of the freezer?
An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 0.210rev/s. Compute the fan's angular velocity magnitude after time 0.205s has passed
A lens with a focal length of 60cm is sitting 90cm in front of a lens of focal length 40cm. where is the final image formed
a a wire has a current density of 6.59 times 106 am2. if the cross-sectional area of the wire is 1.05 mm2 what current
A microwave oven has a power requirement of 1256 W. A frozen dinner requires 5.2 min to heat on full power. How much electrical energy (in kWh) is utilized
the boom of a fire truck raises a fireman and his equipment - total weight 280 lbf 60 ft into the air to fight a
Hand pushing book against vertical wall. The mass of the book is 1.2 kg. The coefficient of friction between the book and the hand is 0.40. What is the magnitude of the pressing force F that the hand must exert
the magnitude j of the current density in a certain wire with a circular cross section of radius r 2.50 mm is given by
Two pipes of equal length are each open at one end. Each has the fundamental frequency of 500 Hz at 325 K. In one pipe the air temperature is increased to 330 K. If the two pipes are sounded together, what beat frequency results.
"Hollywood" cinema is wrought by a tension within the system, that between commerce and art. As such, the "genius of the system" (to use Schatz's phrase) is a confluence of ideological and aesthetic modes of representation. Discuss this propositio..
Outline what you know about the electronic structure of graphene and outline two methods to make carbon nanotubes
an air-filled parallel-plate capacitor has plates of area 2.50 cm2 separated by 1.00 mm. the capacitor is connected to
Suppose a flat roof has a surface area of 1.18000×102 m2. Presume the air inside the building (and under the roof) is at atmospheric pressure, 1.01325×105 Pa, What is the force with which the air inside the house pushes the roof upward
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