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A hot air heating system rated at 84,000 Btu/hr has an efficiency of 65%. The furnace fan can move 225 ft3 of air per minute. If the air enters the furnace at 60.0°F, determine the temperature of the outlet air.
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Question: A rocket starts from rest and moves upward from the surface of the earth. For the first 10s of its motion, the vertical acceleration of the rocket is given by ay=(3.00m/s3)t, where the +y-direction is upward. W ...
Three people are fighting over a book. The mass of the book is m=9.18kg. Each person exerts a force on the book, F. The angle between the first person and the second person's force is 125.9 degrees. If the first person i ...
Suppose that your user's manual lists your car's weight at 2800 pounds, and you calculate a weight of 2900 pounds based on measurements of the car's tire areas and pressure. What is the percent error between your experim ...
Question: A parallel-plate vacuum capacitor is connected to a battery and charged until the stored electric energy is . The battery is removed, and then a dielectric material with dielectric constant is inserted into the ...
Question: Patients undergoing an MRI occasionally report seeing flashes of light. Some practitioners assume that this results from electric stimulation of the eye by the emf induced by the rapidly changing fields of an M ...
Question: A stretched spring stores 2.2 of energy. How much energy will be stored if the spring is stretched three times as far? The response must be typed, single spaced, must be in times new roman font (size 12) and mu ...
Question: Planet X orbits the star Omega with a "year" that is 180 earth days long. Planet Y circles Omega at four times the distance of Planet X. How long is a year on Planet Y in earth days? The response must be typed, ...
Question: People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques. Suppos ...
A baseball is thrown vertically upward at a speed of 39.2 m/s. How much time elapsed before it reaches it highest points, and how high above the ground does it get?
Question: The radius of the earth's orbit around the sun (assumed to be circular) is 1.5*10^8 km , and the earth travels around this orbit in 365 days. a) What is the magnitude of the orbital velocity of the earth in m/s ...
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