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A laser produces a 5.10mW beam of light, consisting of photons with a wavelength of 637.8nm.
Part A How many photons are emitted by the laser each second?
Part B The laser beam strikes a black surface and is absorbed. What is the change in the momentum of each photon that is absorbed?
Part C What force does the laser beam exert on the black surface?
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A penny of mass 3.10 g rests on a small 22.40 g block supported by a spinning disk of radius 11 cm. The coefficients of friction between block and disk are 0.715 (static) and 0.64 (kinetic) while those for the penny and block are 0.564 (static) an..
When a certain spring is stretched by an amount x, it produces a restoring force of F(x) = ax=bx^2, where a and b are constants. How much work is done through an external force in stretching the spring by an amount D from its equilibrium length.
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