Where did most elements heavier than hydrogen and helium come from?
A) They were produced in the Big Bang.
B) They evolved from hydrogen and helium shortly after the Big Bang.
C) They were produced by stars.
D) They were produced inside interstellar gas clouds.
E) all of the above
C) They were produced by stars.
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A known weight W is supported at B by two separate cables, AB and BC. Later cable BD with known tensile force TBD 5 W/2 is added to prevent oscillations. The force in cable AB, TAB, is (in terms of weight W):
(A) 20.98W
(B) 0.96W
(C) 20.84W
(D) 20.76W
The greenhouse effect occurs because
a. low frequency EM waves are reflected from the atmosphere b. high frequency EM waves are reflected from the atmosphere c. the ozone layer absorbs ultraviolet light d. carbon dioxide in the atmosphere absorbs infrared radiation e. none of the above
The upper mantle can be divided into two portions, the
A) asthenosphere (lower zone of the upper mantle) and part of the lithosphere (the top zone of the upper mantle). B) asthenosphere (top zone of the upper mantle) and the lithosphere (the lower upper mantle). C) Moho and the lithosphere. D) continental mantle and the oceanic mantle.
A baseball is hit with a bat and, as a result, its direction is completely reversed and its speed is doubled. If the actual contact with the bat lasts 0.45 s,
what is the ratio of the magnitude of the average acceleration of the ball to its original speed? A) 6.7 s-1 B) 4.4 s-1 C) 2.2 s-1 D) 0.15 s-1