Each element has its own set of characteristic absorption lines because
a. the temperature of each element can varies.
b. elements can exist in different forms of matter.
c. electron energy levels differ for each element.
d. each element has a different mass.
e. absorption lines depend upon the speed of the object.
c
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What is a pulsar?
A) a star that alternately expands and contracts in size B) a rapidly rotating neutron star C) a neutron star or black hole that happens to be in a binary system D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a star that is burning iron in its core
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
If the nation's yearly total energy use and also the yearly gross national product [GNP] are graphed, the two graphs rise at the same rate until the mid-1970s, but they diverge from each other after about 1973
This divergence of the graphs shows that A) energy use increases when the nation's goods and services increase. B) U.S. energy efficiency decreased after 1973, due to lower energy prices. C) energy efficiency has played a large role in providing goods and services since 1973. D) as the price of goods and services decreases, energy use increases. E) an increasing GNP causes energy use to also increase.
A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
a. 8.1 N down the incline b. 3.0 N down the incline c. 2.1 N up the incline d. 3.0 N up the incline e. 8.1 N up the incline