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Air conditioners are rated by their coefficient of performance at 60F inside temperature and 96F outside temperature. An efficient but realistic air conditioner has a coefficient of performance of 3.2. What is the maximum possible coefficient of performance?
A motorcycle daredevil plans to ride up a 2.50m high 25.0° ramp, sail across a 10-m-wide pool filled with hungry crocodiles, and land at ground level on the other side.
A uniform plank of length 4.30 m and weight 226 N rests horizontally on two supports, with 1.10 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 437 N walk on overhanging part of the plank be..
A block of weight wt1 = 409 N sits on a frictionless table of mass 118 kg. The block is connected via frictionless pulley to a hanging block with weight wt2 = 172 N. FIND the tension in the rope connecting the two masses
Find the rms voltage across each element in an RLC circuit with R = 9.9k? , C = 0.14?F , and L = 27mH
Compute the change in entropy of 1 gram of water as it goes from solid ice at 0 celsius to water vapor at 100 Celsuis
Presume the electron is at the midpoint between the proton.
A hunter on a frozen, essentially frictionless pond uses a rifle that shoots 4.20g bullets at 975m/s. Find the recoil speed of the hunter if he fires the rifle horizontally
A passenger on a stopped bus notices that rain is falling vertically just outside the window. Find the speed of the raindrops, given that the bus is moving with a speed of 17.2 m/s
A certain automobile engine is performing work at the rate of 33900 W (45 hp) with an efficiency of 27%
Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 24.1 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the..
What is the magnitude of the apparent weight of a 83 astronaut 4600 from the center of Earth's Moon in a space vehicle moving at constant velocity.
Calculate, using Newton's law of gravity, the magnitude of the force of attraction between the Earth and a mass of 16.000 kg on the Earth's surface
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