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Question: What is the coefficient of performance of a refrigerator that operates with Carnot efficiency between temperatures -3.00°C and +30.00°C?
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If a visible photon with wavelength 434 nm is emitted from an atom in a hydrogen gas lamp, what energy state was the atom in before the photon was emitted? That is, what was the number for that state?
An object weighing 305 N in air isimmersed in water after being tied to a string connected to abalance. The scale now reads 255 N. Find the density of the object
A public school law requires a minimum illumination of 160 lx on the surface of all students’ desk. If the lights are 2.0 m above the desks, what is the minimum luminous flux the lights should deliver?
Jason takes off across level water on his jet powered skis. Determine how far has Jason traveled when he finally coasts to a stop
An ideal gas is enclosed in a cylinder with a movable piston on top of it. Calculate how much work is done on the gas as the temperature of 0.180 mol of the gas is raised from 16.5°C to 330°C
A man holds a double-sided spherical mirror therefore that he is looking directly into its convex surface, 55 cm from his face. The magnification of the image of his face is +0.23. What will be the image distance when he reverses the mirror (looking ..
A bullet of mass m= 0.0230 kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.30 kg.obtain the speed of the bullet just before it hits the wood
A car is accelerating while its horn is blowing. Just after the car passes a stationary person, the person hears a frequency of 960 Hz. 17.5 seconds later, the frequency heard by the person has decreased to 927 Hz. When the car is stationary, its ..
It takes 4.186 Joule of energy to raise the temperature of 1 gram of water by 1oC. Determine how fast would a cricket have to jump to have that much kinetic energy
A football is kicked at ground level with a speed of 15.0 m/s at an angle of 34.0° to the horizontal. How much later does it hit the ground
A pendulum sweeps out an angle of 12.5° during its motion. How far does the pendulum bob (the ball at the end of the rope) travel
Eyeglass lenses can be coated on the inner surfaces to reduce the reflection of stray light to the eye. If the lenses are medium flint glass of refractive index 1.62 and the coating is fluorite of refractive index 1.432,
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