Physics

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A refrigerator has a coefficient of performance of 1.15, and it extracts 7.95 J of heat from the ... Started by torybrooks	1 Replies 82 Views	Jul 29, 2018 by 14vl19
A certain Carnot heat pump transfers energy from the outside of a house, where the temperature is ... Started by soccerdreamer_17	1 Replies 109 Views	Jul 29, 2018 by momo1250
A Carnot engine operating between a reservoir of liquid mercury at its melting point (233 K) and a ... Started by notis	3 Replies 126 Views	Jul 29, 2018 by Jbrasil
The compressor in a certain Carnot refrigerator performs 480 J of work to remove 150 J of heat from ... Started by skymedlock	1 Replies 97 Views	Jul 29, 2018 by dmurph1496
A Carnot refrigerator takes heat from water at 0C and rejects heat to a room at 12C. Suppose that ... Started by burchfield96	1 Replies 81 Views	Jul 29, 2018 by Pariscourtney
A plane flies toward a stationary siren at 1/4 the speed of sound. Then the plane stands still on ... Started by jessicacav	1 Replies 112 Views	Jul 29, 2018 by ryansturges
A 2.00-kg block of ice at 0.00C is dropped into a very large lake at 25.0C and completely melts. For ... Started by bobypop	3 Replies 165 Views	Jul 29, 2018 by yuyiding
A 610-g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of ... Started by tatyanajohnson	1 Replies 241 Views	Jul 29, 2018 by underwood14
Standing waves of frequency 57 Hz are produced on a string that has mass per unit length 0.0160 ... Started by SGallaher96	1 Replies 141 Views	Jul 29, 2018 by akemokai
A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental ... Started by Jkov05	1 Replies 74 Views	Jul 29, 2018 by bookworm410
One of the harmonics of a column of air open at one end and closed at the other has a frequency of ... Started by jayhills49	3 Replies 109 Views	Jul 29, 2018 by k.lashomb
A thin taut string is fixed at both ends and stretched along the horizontal x-axis with its left end ... Started by jessicacav	1 Replies 174 Views	Jul 29, 2018 by Kaytorgator
Radio station KBOB broadcasts at a frequency of 85.7 MHz on your dial using radio waves that travel ... Started by crobinson2013	1 Replies 524 Views	Jul 29, 2018 by mrphibs
Two loudspeakers placed 6.0 m apart are driven in phase by an audio oscillator whose frequency range ... Started by cherise1989	1 Replies 83 Views	Jul 29, 2018 by meltdown117
Two strings of identical material and radius are stretched with the same tension with their ends ... Started by Jipu 123	3 Replies 305 Views	Jul 29, 2018 by SamMuagrove
A person is hearing two sound waves simultaneously. One has a period of 1.50 ms and the other one a ... Started by burchfield96	1 Replies 117 Views	Jul 29, 2018 by lgoldst9
A diffraction grating has 450 lines per mm. What is the highest order m that contains the entire ... Started by krzymel	1 Replies 60 Views	Jul 29, 2018 by abctaiwan
The speed of light in a material is 0.50 c. What is the critical angle of a light ray at the ... Started by Medesa	1 Replies 60 Views	Jul 29, 2018 by cpetit11
A singer is farsighted and cannot see objects clearly that are closer than 80.0 cm from his unaided ... Started by azncindy619	3 Replies 96 Views	Jul 29, 2018 by brittanywood
What power contact lens must be used to correct the vision of a nearsighted person whose far point ... Started by ts19998	1 Replies 146 Views	Jul 29, 2018 by laurnthompson
The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be ... Started by tichca	1 Replies 96 Views	Jul 29, 2018 by yahahah24021
A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal ... Started by berenicecastro	1 Replies 213 Views	Jul 29, 2018 by Beatricemm
What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when ... Started by V@ndy87	3 Replies 129 Views	Jul 29, 2018 by brittrenee
The water company increased the water pressure in the water flowing to an apartment. The water ... Started by Zulu123	1 Replies 325 Views	Jul 29, 2018 by Gabe
Salt water has greater density than fresh water. A boat floats in both fresh water and in salt ... Started by Beheh	1 Replies 488 Views	Jul 29, 2018 by JaynaD87