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A heat pump with a cop of 1.8 supplies energy to a house at a rate of 75000 kJ/h. Determine the electric power drawn by the heat pump and the rate of heat removal from the outside air
A dc motor is connected to a constant emf of 13.9 V. The resistance of its windings is 2.0 ?. What current does it draw at normal operating speed
A spaceship leaves Earth traveling at 0.65 c. A second spaceship leaves the first at a speed of 0.80 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth
A student in an undergraduate physics lab is studying Archimede's principle of bouyancy. The student is given a brass cylinder and using a triple beam balance finds the mass to be 1.25 kg
The ground state energy of an electron in an infinite square well is 3.24 x 10-3eV. What is the width of the square well
A device used in radiation therapy for cancer contains 3.10×10-1 g of cobalt 2760Co (59.9333819 u). Determine the activity of the radioactive material
The front spring of a car's suspension system has a spring constant of 2.32 x 106 N/m and supports a mass of 183 kg. The wheel has a radius of 0.433 m. The car is traveling on a bumpy road, on which the distance between the bumps is equal to the c..
If a 62.6 kg runner dissipates a power of 60.9 W during a race, explain how fast is the person running? Assume a running step is 1.50m in length
03.3 A boat is heading upstream when a float is dropped overboard and carried downstream. What is the boat's speed in still water?
An athlete crosses a 28 m wide river by swimming perpendicular to the water current at a speed of 0.8 m/s relative to the water. What is the speed of the swimmer with respect to a friend at rest on the ground
A new fabric is made to help athletes stay cool. It has a conductivity constant of 898.785 J/(s m K). what is the power of the materials thermal conductivity
What are changes in the object's momentum and velocity. How much work is done if the similar tension is directed parallel to the snow.
As a 1240-kg truck travels up a 15.4-m-high hill, the nonconservative forces of friction and the force generated by the engine do work on the truck. determine the change in the truck's kinetic energy
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