According to this plot, which is the third most abundant element in the universe?
A) boron B) oxygen C) helium D) lithium E) hydrogen
B
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Strictly speaking, gas pressure inside an inflated stretched balloon is
A) less than air pressure outside the balloon. B) equal to air pressure outside the balloon. C) slightly greater than air pressure outside the balloon.
Two parallel conductors are carrying currents in the opposite direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 mT. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. a value greater than 40 mT c. 40 mT b. a value less than 40 mT d. It could be any value.
Uniform Circular Motion: A particularly scary roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is 13.2 m, with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.
A. 11.4 m/s B. 12.5 m/s C. 10.1 m/s D. 14.9 m/s
At the upper right of the Hertzprung—Russell diagram we find
A) red giant stars B) supergiant stars C) white dwarfs D) main sequence stars