The Pleistocene epoch is also referred to as the ______________
Fill in the blank(s) with correct word
Ice Ages
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Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a longer wavelength than Y. Regarding their frequencies and their energies,
A) X has the larger (higher) frequency and carries the greater energy. B) Y has the larger frequency and X carries the greater energy. C) Y has the larger frequency and carries the greater energy. D) X has the larger frequency and Y carries the greater energy. E) Y has the larger frequency and the two waves carry the same energy.
A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN b. 39 kN c. 45 kN d. 48 kN e. 35 kN
A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The efficiency of the engine is
a. 80% b. 40% c. 60% d. 20% e. 50%
The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens. b. active optics. c. a Schmidt-Cassegrain design. d. a Newtonian design. e. interferometry.