It is believed that the planet Mars has a much thicker carbon dioxide atmosphere in the past than it does today. Where the bulk of this carbon dioxide go?
A) it reacted with surface rocks
B) it condensed to form the polar caps
C) it was destroyed in the atmosphere through chemical reactions
D) it was lost into space
D
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A light ray passes from air through a thin plastic slab (n = 1.3) with parallel sides. If the ray in air makes an angle of 67° with the normal after leaving the slab, what is the angle of incidence for the ray in air as it impinges upon the other side of the slab?
a. 33° c. 58.5° b. 67° d. 45°
An aluminum electric tea kettle with a mass of 500 g is heated with a 500-W heating coil. How long will it take to heat up 1.0 kg of water from 18°C to 98°C in the tea kettle?
The specific heat of aluminum is 900 J/kg ? K and that of water is 4186 J/kg ? K. A) 5.0 minutes B) 7.0 minutes C) 12 minutes D) 15 minutes E) 18 minutes
The region from the origin to the elastic limit on an applied force versus elongation graph for a typical metal under tension is referred to as the
A) elastic region. B) proportional region. C) plastic region. D) ultimate strength region. E) breaking region.
A generator is a device that converts
a. heat energy into mechanical energy. b. chemical energy into electrical energy. c. mechanical energy into electrical energy. d. electrical energy into mechanical energy.