Simple Harmonic Motion: A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?
A. 1.3 Hz
B. 0.75 Hz
C. 1.6 Hz
D. 0.63 Hz
Answer: A
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The sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. sun is on the ecliptic and is never on the celestial equator.
A real image of a candle formed with a converging lens can be viewed on a screen placed
A. at either focal point of the lens. B. at a single position determined by the distance of the object and the construction of the lens. C. anywhere on the side of the lens from which the light emerges. D. nowhere; that is, it can't be viewed on a screen at all.
A particle (charge = +40 ?C) is located on the x axis at the point x = ?20 cm, and a second particle (charge = ?50 ?C) is placed on the x axis at x = +30 cm. What is the magnitude of the total electrostatic force on a third particle (charge = ?4.0 ?C) placed at the origin (x = 0)?
a. 41 N b. 16 N c. 56 N d. 35 N e. 72 N
The vertical speed of a projectile
a. is zero b. stays constant c. continuously increases d. continuously decreases e. sometimes decreases and sometimes increases