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Q. If the average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0% of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second?

Q. A 1125-kg car and a 2250-kg pickup truck approach a curve on the express way that has a radius of 225 m. (a) At what angle should the highway engineer bank this curve so that vehicles traveling at 95 km/h can safely round it? (b) As the car and truck round the curve at 95 km/h, find the normal force on each one due to the highway surface.

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