Radioactivity Basics: A radioactive isotope of atomic number Z emits an alpha particle, and the daughter nucleus then emits a beta-minus particle. What is the atomic number of the resulting nucleus?
A. Z - 1
B. Z + 1
C. Z - 2
D. Z - 3
Answer: A
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An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?
A) It changes, but it is impossible to tell which way. B) It increases. C) It does not change. D) It decreases.
Newton never knew the numerical value of "his" universal gravitational constant G
Indicate whether the statement is true or false
How do we know what asteroids are made of?
A. The spectrum of sunlight reflected from an asteroid shows absorption features, from which we can determine its composition. B. Astronomers have landed a spacecraft on one of them and analyzed its composition. C. Astronomers have studied meteorites that originated in the Asteroid belt. D. All of these choices are correct.
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.