A dropped ball gains speed because
A) its velocity changes.
B) a gravitational force acts on it.
C) of inertia.
D) its nature is to become closer to Earth.
Answer: B
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An electron is moving at
m/s at an angle of 40
to a 0.80 T magnetic field. What is the magnitude of the acceleration of the electron?
A. 
B. 
C. 
D. 
E. 
A galaxy with almost no starlight but plenty of cool clouds of hydrogen gas would be best observed with a(n) ________ telescope.
A. optical (visible-light) B. radio C. X-ray D. infrared
Two strings are, respectively, 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
A. 0.800, 0.670, 0.500 B. 1.33, 1.00, 0.500 C. 2.00, 1.00, 0.500 D. 2.00, 1.33, 1.00 E. 4.00, 2.00, 1.00
When an electron drops from a higher energy level to a lower one, energy is emitted. In comparison, how much energy is required to reverse the process, going from the lower level to the higher level?
A) less energy B) the same energy C) more energy