Over time, the star-gas-star cycle leads the gas in the Milky Way to
A) have a greater abundance of heavy elements.
B) have a lower abundance of heavy elements.
C) become denser and have a greater abundance of heavy elements.
D) become denser and hotter.
A
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As the solar nebula contracts due to gravitation, the cloud
A) spins faster. B) expands. C) becomes more spherical in shape. D) changes direction of motion. E) begins to cool.
Power: A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left after powering the circuit for 1.0 h?
A. 16 kJ B. 27 kJ C. 43 kJ D. 41 kJ
In vulcanized rubber, sulfur atoms ______________the latex long-chain molecules.
Fill in the blank(s) with the appropriate word(s).
What is the initial direction of the magnetic force acting on the particle in each case?
A. Forward
B. Backward
C. Rightward
D. Leftward
E. Into the paper
F. Out of the paper
T. (Zero force)