An ice skater spins at 3.5 rev/s with his arms are extended. He draws his arms in and spins at 8.3 rev/s. By what factor does his moment of inertia change in the process?
a. 2.4 b. 0.58
c. 0.42 d. 0.12
c
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The mass of a galaxy can be estimated using Newton's modification of Kepler's Third law.
Answer the following statement true (T) or false (F)
During a strenuous period of extravehicular activity, an astronaut generates 2.0 MJ of heat per hour, which must be removed by means of the liquid cooling and ventilating garment (LCVG) worn under the spacesuit
How much water must be circulated in the LCVG to remove this quantity of heat if it takes it from the astronaut at 37°C and dumps it at 0°C? A) 1.5 kg/hr B) 7.8 kg/hr C) 13 kg/hr D) 26 kg/hr E) 480 kg/hr
What is an ionization nebula?
A) a name sometimes used to describe spiral galaxies besides the Milky Way B) a region of very hot, low-density gas surrounding a recent supernova C) a clump of gas that will soon give birth to a new star D) a colorful cloud of gas that glows because it is heated by light from nearby hot stars
What is produced by the process of electrolysis?
A) energy B) hydrogen and oxygen C) pure drinking water D) photovoltaic power