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

Physics & Space Science

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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).

Physics & Space Science

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

Physics & Space Science

Which planet shows the largest variation of day and night temperatures?

A. Earth B. Mars C. Venus D. Mercury

Physics & Space Science

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

Physics & Space Science