Physics, 27.01.2020 17:31 KittyLoverCat
Which describes an object’s speed in free fall?
the object accelerates until it reaches its terminal velocity.
the object falls at a constant speed because only one force acts on it.
the object falls faster and faster until it strikes the ground.
the object speeds up and then stops when air resistance equals gravity.
Answers: 3
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Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?
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Which describes an object’s speed in free fall?
the object accelerates until it reaches...
the object accelerates until it reaches...
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