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A block of mass 1.2 kilogram slides down an inclined surface of length 1.0 meter. The inclined surface makes an angle of 30o with the horizontal. Its initial velocity is1.0 m/s. When it reaches the bottom it has a velocity of 2.0m/s.
a) Evaluate the initial mechanical energy of the block?
b) Find the work done by the force of kinetic friction?
c) Find the force and the coefficient of kinetic friction?
the plank cde has a weight of 30 lb and rests on a small pivot at d. the ll5-lb gymnast a is standing on the plank at c
A ray of light is traveling in glass and strikes a glass/liquidinterface. The angle of incidence is 51.0°, and the index ofrefraction of glass is n = 1.50. What must be the index of refraction of theliquid such that the direction of the light enter..
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