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A heat pump delivers 34.0 kW to heat a house. The outside temperature is -9.0°C and the inside temperature of the hot-air supply for the heating fan is44.0°C. What is the coefficient of performance of a Carnot heat pump operating among these temperatures? Note that a heat pump is like a refrigerator by the output of the hot reservoir serving as the source of heat.
What should be the minimum power of the engine needed to run the heat pump?
If the efficiency is 70.0% of a Carnot engine, what should be the minimum power of the pump?
A 965 kg car traveling initially with a speed of 25.3 m/s in an easterly direction crashes into the rear end of a(n) 9510 kg truck moving in the same direction at 16.8 m/s. What is the velocity of the truck immediately after the collision
Dolphins emit clicks of sound for echolocation and communication. Find the difference (in Hz) between this frequency and the number of clicks per second actually emitted by the dolphin
A proton in a tin nucleus is known to lie with in a sphere whoes diameter is about 1.2x10^-14m. what is the uncertainty in the momentum of the proton
On Apollo Moon missions, the lunar module would blast off from the Moon's surface and dock with the command module in lunar orbit. Find the impact speed of the lunar module
A singly ionized Nickel atom has an overall charge of 1.602 x 10^-19C and a mass m = 9.80 x 10^-26 g. what will the radius of the curved path that the Nickel atom has within the deflection chamber be
An object placed 10.0 cm from a concave spherical mirror produces a real image 8.00 cm from the mirror. what is the position of the image
You connect five identical resistors in series to a battery whose EMF is 12.0 V and whose internal resistance is negligible. obtain the potential difference across each resistor
What is the least thickness of a soap bubble film (n = 1.38) on which light of wave length 610nm shines, assuming one observes constructive interference of the reflected light.
The "reaction time" of the average automobile driver is about 0.7 s. Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 15.6 mi/h
What is coefficient of friction between chair and floor
A 11.1-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 60.3-N horizontal force. find the rope\'s angle from the vertical
The men's world record for the shot put, 23.12 m, was set by Randy Barnes of the United States on May 20; 1990.If the shot was launched from 6 ft above the ground at an initial angle of 42degrees, what was its initial speed.
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