Radioactive Decay: The decay constant of a radioactive nuclide is 4.6 × 10-3 s-1. What is the half-life of this isotope, in minutes?
A. 2.5 min
B. 3.6 min
C. 3.1 min
D. 1.4 min
E. 2.0 min
Answer: A
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Simple Pendulum: When a certain simple pendulum is set swinging, its angular displacement ? as a function of time t obeys the equation ? = 8.5° cos(2.4 s-1t). How long is the pendulum?
Fill in the blank(s) with the appropriate word(s).
Freely falling bodies experience
a. motion with constant velocity. b. motion with zero acceleration. c. motion with constant acceleration. d. motion at a constant speed. e. none of the above
Which planet shows the largest variation of day and night temperatures?
A. Earth B. Mars C. Venus D. Mercury
A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank
A) due east of its starting point. B) 100 m farther south. C) 141 m farther south. D) none of the above