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A heat pump has a coefficient of performance equal to 4.35 and requires a power of 1.77 kW to operate.
(a) How much energy does the heat pump add to a home in one hour?
(b) If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?
A vessel whose walls are thermally insulated contains 2.10 of water and 0.450 of ice, all at the temperature of 0 . The outlet of a tube leading from a boiler in which water is boiling at atmospheric pressure is inserted into the water.
A crate is sliding down an inclined plane. The coefficient of kinetic friction between the crate and the plane is 0.3, the mass of the crate is 30 kg, and the angle of incline is 20°.
The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 x 1030 kg, in an almost circular trajectory. Calculate the radius of the orbit of Venus and the orbital speed of Venus as it circles the sun.
A town is planning on using the water flowing through a river at a rate of 5.0 x 106 kg/s to carry away heat from a new power plant, What is the maximum power this plant can produce
A 12.0V dc battery having no appreciable internal resistance, a 146.5? resistor, an 10.6mH inductor, and an open switch are all connected in series. After the switch is closed, what is the maximum energy stored in the inductor
A conveyor belt at a quarry lifts 2,000 kg of sand per minute up a vertical distance of 12 meters. The sand is at first at rest, then moves at a speed of 0.20 m/s along conveyor belt. What is the instantaneous power generated by this machine .
q1. a cord is used to vertically lower an initially stationary block of mass m kg at a constant downward acceleration
A train moving at a constant speed of 59.0 km/h moves east for 50.0 min, What is the average velocity of the train during this run
A ship sets out to sail to a point 141km due north. An unexpected storm blows the ship to a point 138 km due east of its starting point. (a) How far (in km) and (b) in what direction (as an angle from due east, where north of east is a positive an..
You pull a 12 kg sled across the floor with a strap that is at an angle of 31° above the horizontal with a force 76 N. Determine the magnitude of the acceleration of the sled, given that the coefficient of kinetic friction between the suitcase an..
Suppose a bat chirp has a frequency of 29 kHz. How fast would the bat have to fly, and in what direction, for you to just barely be able to hear the chirp at 19 kHz
Three point charges, -6.05 10-9 C, -9.40 10-9 C, and +7.25 10-9 C, are fixed at different positions on a circle. What is the radius of the circle
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