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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.
Capacitors C1=10\muF and C2=25\muF are each charged to 25V , then disconnected from the battery without changing the charge on the capacitor plates. What is the potential difference across each capacitor
A proton is initially at rest at a point where the potential is 507V. Sometime later the proton is at a point where the potential is 187V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
In a women's 100-m race, accelerating uniformly, Laura takes 1.98 s and Healan 3.17 s to attain their maximum speeds, What is the maximum distance by which Healan is behind Laura
The work function for sodium is 2.46 eV. What is the stopping potential, What is the cut-off wavelength for the emission of electrons from a sodium surface
The moon's diameter is 3.48 × 106 m, and its mean distance from the earth is 3.85 × 108 m. Find the diameter of the moon's image on the slide film
A vertical spring with a spring constant of 440 N/m is mounted on the floor. what height (in cm) above the compressed spring was the block dropped
q1. the resistor in a circuit has a resistance of 148 ohms. what capacitance should be used in this circuit if the time
A satellite circles the earth in an orbit whose radius is 3.26 times the earth's radius. What is the period of the satellite
There are no results for For a transformer with Vp=120Vrms, and turn ratio of 8 to 1 with a RL of 500. What is the secondary ratio
If you were to build a pipe organ with open-tube pipes spanning the range of human hearing (20 Hz to 20 kHz), what would be the range of the lengths of pipes required
A mass m1 = 5.4 kg rests on a frictionless table and connected by a massless string to another mass m2 = 4 kg, How much work is done by the force F on the two block system
A reflecting telescope has a main mirror with fM = 620 mm. If an eyepiece with a magnification of 15 is used, what is the total magnification of the telescope
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