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Q. An electromagnetic wave strikes a 1.30cm2 section of wall perpendicularly. the rms value of the wave's magnetic field is 6.8x10^-4 T. how long does it take for the wave to deliver 1850 J of energy to the wall?

Q. A gymnast with mass m1 = 40 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 110 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the beam.

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