Calculate the work the crane performs

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Q. A crane lifts a 2.80 103-N bucket containing 1.25 m3 of soil (density = 2.00 x 103 kg/m3) to a height of 6.95 m. Calculate the work the crane performs.

Q. A certain type of laser emits light that has a frequency of 5.6 x 1014 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 3.9 x 10-11 s. (a) How many wavelengths are there in one pulse? (b) The light enters a pool of water. The frequency of the light remains the same, but the speed of the light slows down to 2.3 x 108 m/s. How many wavelengths are there now in one pulse?

Reference no: EM1356361

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