A 100-kg person sits on a 5-kg bicycle. The total weight is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa. What length of each tire is in contact with the ground?
A) 1.6 cm
B) 1.8 cm
C) 3.2 cm
D) 2.4 cm
E) 6.4 cm
C
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In order of size from smallest to largest, the five terrestrial worlds are
A) Mercury, Venus, Earth, Moon, Mars. B) Mercury, Moon, Venus, Earth, Mars. C) Moon, Mercury, Venus, Earth, Mars. D) Moon, Mercury, Mars, Venus, Earth. E) Mercury, Moon, Mars, Earth, Venus.
Any object moving relative to Earth will have a Doppler shift when viewed from Earth
Indicate whether the statement is true or false
A light ray reflects from a surface. If the angle of incidence is 
what is the angle between the reflected ray and the incident ray at the surface?
a. 
b. 
c. 
d. 
e. 
As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity:
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.