Which of these is stated properly?
a. "The temperature of liquid nitrogen is 77 Kelvin.".
b. "The temperature of liquid nitrogen is 77 Kelvins.".
c. "The temperature of liquid nitrogen is 77 degrees Kelvin.".
d. "The temperature of liquid nitrogen is 77 Kelvin degrees.".
b
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A wooden block contains some nails so that its density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A) rise to the surface. B) sink to the bottom. C) remain where it is released.
The only probe into the atmospheres of any jovian planet was launched by
A) Voyager 2 into Titan's atmosphere. B) Huygens into Saturn's equatorial belt. C) Cassini into Saturn's clouds. D) Pathfinder into Mars' atmosphere. E) Galileo into Jupiter's equatorial zone.
To minimize heat loss it is best that a teapot be
A) black. B) silver. C) depends on size, not color
An optical fiber is made of clear plastic with index of refraction n = 1.57 . For what angles with the surface will light remain within the plastic "guide"?
a. ? < 32.5° b. ? < 57.3° c. ? < 39.6° d. ? < 50.4° e. ? < 68.7°