Power: If electricity costs 7.06¢/kW?h, how much would it cost you to run a 120-W stereo system 4.0 hours per day for 4.0 weeks?

A. $0.95
B. $0.14
C. $1.62
D. $2.66


Answer: A

Physics & Space Science

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Which of the 4 fundamental forces binds the nucleus together, and which binds the atom [the electron orbits] together?

A) Strong nuclear force binds the nucleus, weak nuclear force binds the atom. B) Strong nuclear force binds the nucleus, electric force binds the atom. C) Weak nuclear force binds the nucleus, strong nuclear force binds the atom. D) Gravity binds the nucleus, electric force binds the atom. E) Electric force binds the nucleus, strong nuclear force binds the atom.

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Jeff throws a ball straight up. For which situation is the vertical velocity zero?

a. on the way up b. at the top c. on the way back down d. none of the above

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You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s

A) 6.96 m B) 20.2 m C) 22.9 m D) 18.8 m E) 20.0 m

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Helium-neon laser light (l = 632.8 nm) is sent through a single slit of width 0.41 mm. What is the width of the central maximum on a screen 1.0 m in back of the slit? (1 nm = 10-9 m)

a. 5.3 mm c. 3.1 mm b. 4.2 mm d. 2.0 mm

Physics & Space Science