When a wheel is rolling without slipping, the magnitude of its velocity relative to the ground is greatest at
A. the point in contact with the ground.
B. the point at the center of the wheel.
C. the point at the top of the wheel opposite to the point in contact with the ground.
D. the point farthest forward from the center of mass of the wheel.
E. the point farthest behind the center of mass of the wheel.
Answer: C
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According to quantum theory, the electron in a particular quantum state of the hydrogen atom has
A) a definite position. B) a definite energy. C) a definite velocity. D) All of the above. E) None of the above.
Radioactivity Basics: When an unstable nucleus decays by emitting an alpha particle, the atomic number Z of the nucleus
A. increases by 4. B. increases by 2. C. decreases by 2. D. decreases by 4. E. remains unchanged.
Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
a. 3 polarizing filters, each rotate beam by 30°. b. 2 polarizing filters, both rotate beam by 45°. c. 1 polarizing filter, rotating beam by 90°. d. None of the above, polarized light can't be rotated.
Based on what you learn about jovian moons by watching the videos or reading your textbook, what types of evidence for recent or ongoing geological activity have been observed on one or more jovian moons?
a. ice crystals being sprayed out into space b. surfaces with very few impact craters c. river valleys feeding into surface lakes of very cold liquids d. active volcanoes e. river valleys feeding into surface lakes of liquid water f. large, violent storms swirling in counterclockwise directions