Distinguish between cleavage and crystal faces
Natural crystal faces form and produce perfect geometric patterns when a substance
is crystallized. Cleavage develops from planes of weakness within the crystal
structure. The crystal will break along the weakness planes.
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What is the period (in hours) of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg, its radius is 3.40 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
A) 1.75 h B) 1.25 h C) 1.15 h D) 1.00 h E) 1.45 h
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
Earth's temperature remains fairly steady, which means that Earth must return nearly the same amount of energy to space that it receives from the Sun. In what form(s) does Earth return most of this energy to space?
a. infrared light emitted by the surface and atmosphere b. ultraviolet light reflected by the surface c. visible light reflected by clouds d. visible light emitted by the surface and atmosphere e. visible light reflected by the surface
A star with a large parallax
A) is at a great distance from Earth. B) is moving at a great speed with respect to Earth. C) is at a short distance from Earth. D) is moving at a slow speed with respect to Earth. E) is not moving with respect to Earth.