Radioactive Decay: A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A. 1/2
B. 1/4
C. 1/8
D. 1/16
Answer: D
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A difference between the special and general theories of relativity is that
A. special relativity is valid only in stationary reference frames. B. special relativity deals with accelerated systems. C. general relativity deals with accelerated systems. D. general relativity only deals with swiftly moving objects.
What type of lens is used to make a magnifying glass?
A) converging B) diverging C) Either type would work equally well.
Angular Quantities: A chicken is running in a circular path with an angular speed of 1.52 rad/s. How long does it take the chicken to complete one revolution?
A. 4.13 s B. 2.07 s C. 118 s D. 4.77 s E. 8.26 s
The moons of Mars are believed to be
a. composed primarily of iron and nickel. b. composed primarily of frozen gases of water and carbon dioxide. c. orbiting Mars in a direction opposite to the direction that Mars rotates. d. formed from material ejected from Olympus Mons and other large volcanoes on Mars. e. captured asteroids.