A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
a. 2.0 s
b. 6.1 s
c. 3.5 s
d. 1.6 s
e. 1.0 s
a
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A stellar core with a mass greater than 3 solar masses will collapse until it reaches _____
a. the radiusof Earth b. the radius of Mt. Everest c. the radius of a grain of sand. d. the radius of a helium atom e. a radius of zero
Which of the following statements about galaxies is true?
A) Small galaxies outnumber large galaxies and produce most of the light in the universe. B) Small galaxies outnumber large galaxies but large galaxies produce most of the light in the universe. C) There is an approximately equal number of small and large galaxies in the universe and together they each contribute an equal amount of light. D) Most galaxies in the universe are about the same size as the Milky Way. E) Galaxies come in a wide variety of shapes and sizes but are all very blue in color.
The highest tides occur when
A) the Sun and the Moon are on the same side of Earth. B) the Sun and the Moon are on opposite sides of Earth. C) the Sun, Moon, and Earth form a right-angled triangle with Earth at the 90° vertex. D) the Sun, Moon, and Earth form a right-angled triangle with the Moon at the 90° vertex. E) the Sun, Moon, and Earth form a right-angled triangle with the Sun at the 90° vertex.
U.S. industry uses mostly renewable resources for its high economic rate of return
What will be an ideal response?