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A refrigerator has a coefficient of performance of 2.10. Each cycle it absorbs 3.40 104 J of heat from the cold reservoir.
(a) How much mechanical energy is required each cycle to operate the refrigerator?
(b) During each cycle, how much heat is discarded to the high-temperature reservoir?
A transformer steps up the 120 V rms AC power line voltage to 23 kV rms for a TV picture tube. what is the secondary current
Calculate the mass of a solid gold rectanglar bar that has dimensions lwh = 4.20 cm x 12.0 cm x 30.0 cm. (the density of gold is 19.3x10^3 kg/m^3.)
If the heat necessary to warm 855 g of water from a temperature of T1 = 24.0 °C to T2 = 80.0 °C were somehow converted to translational kinetic energy of this amount of water
Two rays travelling parallel to the principal axis strike a large plano-convex lens having a refractive index of 1.60. find the difference in positions where they cross the principal axis
An electric heater used to boil small amounts of water consists of a 15-Ω coil that is immersed directly in the water. Itoperates from a 120-V socket. How much times is required for this heater to raise the temperature of 0.5 kg of water from 13de..
The distance between a proton and an electron is 1m. Calculate the electric force and gravitarional force between them
What is the beat frequency in Hz. A force of magnitude P pushes the block forward and downward as shown in the figure below. suppose the force is applied at an angle of 24.0° below the horizontal.
There is little or no interstellar dust or gas in which of the following galaxy types? What name is given to a galaxy with a smooth distribution ofbrightness and a round, spherical shape? Who developed the "tuning-fork" diagram connecting the differe..
A 1000kg car is moving at a constant speed of 7 m/s when it hits the back bumper of another car with 1200kg of mass moving in the same direction at a constant speed of 6m/s
The electron in a hydrogen atom is in a subshell with maximum angular momentum quantum number l=6. What is the number of states in this subshell
With the switch in position A, the capacitor becomes charged. After a long time, the capacitor charge approaches q = C ?. Determine the energy of the capacitor U(t) as a function of time t
A certain toaster has a heating element made of Nichrome resistance wire. What is the final temperature of the heating element
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