Steam that issues from a pressure cooker
A) is invisible.
B) cools as it expands.
C) both of these
D) neither of these
Answer: C
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Why must radio telescopes have very large dishes?
A. A large mirror is necessary to resolve radio-emitting images. B. The large dish is to compensate for atmospheric absorption of radio waves. C. Large radio telescopes are easier to repair than small instruments. D. Radio-emitting objects are very far from Earth, and so are very dim. E. Size is immaterial to quality observations.
Water flowing through a pipe suddenly comes to a section of pipe where the pipe diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was what is its speed in this smaller section?
A) 49 m/s B) 42 m/s C) 31 m/s D) 27 m/s
If life exists on Mars today, it will most likely be found
A) on the surface B) at the center of the planet C) beneath the surface where liquid water may still exist D) floating high in the atmosphere
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it inclined at 45.° with respect to the x-axis. Observers in the rest frame see the stick making what angle with respect to the x-axis?
A) 79.° B) 66.° C) 53.° D) 45.° E) 88.°