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A heat pump has a coefficient of performance of 3.75 and operates with a power consumption of 6.89 103 W. How much energy does it extract from the outside air?
A student drops two metallic objects into a 32 g steel container holding 169 g of water at 29C. One object is a 486 g cube of copper that is initially at 58C, and the other is a chunk of aluminum that is initially at 6.9C. To the student’s surpris..
Three successive resonance frequencies for a certain string are 481., 518., and 555. Hz. What is the fundamental frequency
An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.95 . The rock falls through a vertical distance of 1.20 and lands a horizontal distance of 8.65 from the astronaut. What is the acceleration of gravity on Zircon?
A vertical solid steel post of diameter d = 24cm and length L = 2.10m is required to support a load of mass m = 8200kg. What is the strain in the post
Find the electric field of a solid sphere of charge, with the nonuniform charge density ρ = Ar, with A an overall constant
How many equally spaced turns must it have so that it will produce a magnetic field of 3.75mT at points within the coils 14.0cm from its center
A rock of mass 54.5 kg breaks loose from the edge of a cliff and falls straight down. What is the magnitude of the acceleration of the rock
A ball is thrown horizontally from the top of a building 19.0 m hight and lands 64.7 m from of the building, With what initial speed was the ball thrown
5 kg of water at 60 degrees are put in contact with 1 kg of ice at 0 degrees and are thermally isolated from everything else. What is the change in entropy of the universe while the ice melts
When an object of 180 kg hangs from a cord around light pulley of the cord between point P and the pulley is lenght L = 2.0 m. how many loop will be formed
A 5.0 megawatt windmill has three 45 m-long blades that can be approximately viewed as straight rods. If the rotational speed of the rods is 6 rpm, what is the mass of each rod
Find the number of revolutions that the wheel turns before it stops(and begins to turn in the opposite direction).
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