Helium fusion does not begin until the star has entered the giant region of the H-R diagram
a. True
b. False
Indicate whether the statement is true or false
True
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What happens inside a reference system with a constant acceleration?
a. Objects appear to move exactly the same way that they do without that acceleration. b. Everything moves at a constant speed. c. The acceleration cannot be recognized by any experiment within the reference system. d. The acceleration can be recognized because a falling object seems to move in the direction of acceleration instead of straight down. e. The acceleration can be recognized because a falling object seems to move away from the direction of acceleration instead of straight down.
The chassis of Formula 1 race cars is now made from
(a) High-strength steel (b) High-strength aluminum (c) High-strength polymers (d) Graphite-fiber-reinforced epoxy
Force on a Moving Charge: A positive charge is moving to the right and experiences an upward magnetic force, as shown in the figure. In which direction must the magnetic field have a component?
A. to the right B. to the left C. upward D. out of the page E. into the page
Nuclear Reactions: In the fission reaction 235U + 1n ? 141Ba + 92Kr + x 1n, what is the number x of neutrons produced?
A. 0 B. 1 C. 2 D. 3