A bat chirps to locate a tasty lunch. The chirp travels at 340 m/s and its echo is heard 1 s after the chirp. Distance to the lunch is
A) 85 m.
B) 170 m.
C) 340 m.
Answer: B
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What was the most controversial issue surrounding the nature of the Universe during the Renaissance?
a. The movement of visible galaxies b. The origins of the Universe c. The number of planets in the Solar System d. The position of Earth in the Universe e. The existence of life on planets other than Earth
The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on
a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from H I regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A.
Slanting Surfaces Without Friction: A slanted roof rises at 35° above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it. A piece of ice at the top suddenly breaks loose and begins to slide down from rest.(a) How long will it take for the ice to reach the bottom edge of the roof?(b) How fast will the ice be traveling just as it reaches the bottom edge?
What will be an ideal response?
The flywheel of a machine is rotating at 126 rad/s. Through what angle will the wheel be displaced from its original position after 6.0 s?
A) 21. radians B) 7.3 × 102 radians C) 1.2 × 102 ° D) 0.32 revolutions E) 7.3 × 10-2 revolutions