1. A 65.0-kilogram astronaut weighs 638 newtons at the surface of Earth. What is the mass of the astronaut at the surface of the Moon, where the acceleration due to gravity is 1.62 meters per second squared?
2. What is the kinetic energy of a 55-kilogram skier traveling at 9.0 meters per second?
3. A beam of monochromatic light (f = 5.09 x10^14 Hz) has a wavelength of 589 nanometers in air. What is the wavelength of this light in Lucite?
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