The general theory of relativity depends on the fact that:
a. the mass m in Newton's law of gravitation always has the same value as the mass m in Newton's second law.
b. inertial mass is measured by how objects respond to forces.
c. gravitational mass is measured by comparing weights.
d. gravitational mass is always greater than inertial mass.
e. gravitational mass is always less than inertial mass.
a
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Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it. B) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the electron?
a. out of the page b. to the right c. to the left d. into the page
How is the circumference, Cn, of the nth orbit in hydrogen and the de Broglie wavelength, 
of the n th orbit related?
a. 
b. 
c. 
d. 
e. 
Possible ways that sea level could lower include a decrease in
A) worldwide temperatures and an increase in the rate of seafloor spreading. B) worldwide temperatures and a decrease in the rate of seafloor spreading. C) tectonic activity and an increase in worldwide temperatures. D) the rate of seafloor spreading and an increase in worldwide temperatures.