What is the frequency (in Hz) of a wave whose displacement is given y = 0.5 sin(0.20x + 120t), where x and y are in cm and t in seconds?
A) 0.5 Hz
B) 19. Hz
C) 120 Hz
D) 10 Hz
E) 0.120 kHz
B
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A horizontally moving positive sodium ion enters a magnetic field that points up. The magnetic force pushes the charge out of its original path. 
When viewed as shown on this page, what direction will the magnetic force point?
A. Out of the page B. Into the page C. There is not enough information to answer
A positive ion is formed when
a. a neutral atom gains an electron c. a negative ion loses an electron b. a neutral atom loses an electron d. all of the above
Capacitors in Combination: Three capacitors of capacitance 5.00 ?F, 10.0 ?F, and 50.0 ?F are connected in series across a 12.0-V potential difference (a battery).(a) How much charge is stored in the 5.00-?F capacitor?(b) What is the potential difference across the 10.0-µF capacitor?
What will be an ideal response?
Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because the
A) carpeted floor provides a smaller impulse. B) stopping time is shorter on the carpet. C) stopping time is longer on the carpet. D) carpet provides a smaller impulse and a longer time.