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A heat pump is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Suppose that the ratio of the actual energy entering the room to the work done by the device's motor is 15.0% of the theoretical maximum ratio. Determine the energy entering the room per joule of work done by the motor given that the inside temperature is 17.0°C and the outside temperature is -3.00°C.
What is the energy density in the electric field at the surface of a 2.00-cm-diameter sphere charged to a potential of 2000V
A parallel plate capacitor is make of two circular thin plates of radius 15 cm separated by 2.5 mm of a material with dielectric constant32. what is the charge resident on each plate
Your roommate is working on his bicycle and has the bike upside down. He spins the 52.0 -diameter wheel, What is the pebbles acceleration
A freezer with a coefficient of performance of 3.53 is used to convert 1.61kg of water to ice in one hour. How much heat is discarded into the room that houses the freezer
A physics demo launches a ball horizontally while dropping a second ball vertically at exactly the same time. Which ball hits the ground first? and why
A Carnot refrigerator operating between -10.0 ?Cand + 10.0 ?C extracts heat from the cold reservoir at the rate 100J/s. What is the rate at which heat is exhausted to the hot side
A heat of 4.3*10^6KJ is req to convert a block of ice at -15deg C into water at 15deg C. What is mass of ice
A spacecraft is traveling with a velocity of vox = 5675 m/salong the +x direction. Two engines are turned on for a time of 847 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.25 m/s2,while the other gives it an acc..
What is the minimum thickness of the film. what is the magnitude of the average acceleration of the ball through out this time interval.
On a hiking trip, you are walking through a canyon with vertical walls and are closer to one wall than the other. find the width of the canyon
A 50 g horizontal metal bar, 12 cm long is free to slide up and down between two tall, vertical metal rods that are 12 cm apart. What is the terminal speed at which the bar falls
Suppose V max = 120 V for an alternating current power source. What is the rms voltage for the source
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