A main sequence star begins transforming into a red giant when
A) helium begins fusing.
B) helium within the core begins to expand.
C) contracting helium causes hydrogen to fuse.
D) hydrogen starts fusing within the core.
Answer: C
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When a net horizontal force of 250 N acts on a 50-kg cart that is free to roll on a level surface,
A. the cart accelerates at 12500 m/s2. B. the cart accelerates at 9.8 m/s2. C. the cart accelerates at 5 m/s2. D. the cart accelerates at 0.20 m/s2. E. the cart does not accelerate because it pushes back on the person with a force of 250 N.
The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness. In which diagram(s) is(are) the block in equilibrium?
A. A B. B C. C D. D E. A and B
Venus is almost the same size, mass, and density as the Earth
Indicate whether the statement is true or false
Which of the following are the jovian planets?
A. Jupiter, Saturn, Uranus, Neptune B. Mercury, Jupiter, and Saturn C. Uranus, Neptune, and Pluto D. Mercury, Venus, Earth, Mars E. Earth, Mars, Jupiter, Saturn