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Q. A high-speed flywheel in a motor is spinning at 450 when a power failure suddenly occurs. The flywheel has mass 38.0 and diameter 78.0 . The power is off for 25.0 and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 170 complete revolutions. At what rate is the flywheel spinning when the power comes back on?

Q. The human eye is sensitive to orange light having a frequency of about 5.0 1014 Hz (a wavelength of about 608 nm). What is the energy in joules of the photons associated with this light?

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