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A sledge loaded with bricks has a total mass of 18.1 kg and is pulled at constant speed by a rope. Therope is inclined at 20.9° above thehorizontal, and the sledge moves a distance of 21.0 m on a horizontal surface. The coefficient ofkinetic friction between the sledge and surface is 0.500.
a) What is the tension of the rope?
b) How much work is done on the sledge by the rope.
c) what is the energy lost due to friction?
A 0.11-kg balloon is filled with helium (density = 0.179 kg/m3). If the balloon is a sphere with a radius of 4.2 m, what is the maximum weight it can lift
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From a distance of 65 m, a photographer usesa telephoto lens (f = 300.0 mm) to take a picture of acharging rhinoceros. How far from the rhinoceros would the photographer have to be to record an image of the same size using alens whose focal length is..
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