A negative magnification for a mirror means that
A) the image is inverted, and the mirror is convex.
B) the image is upright, and the mirror is convex.
C) the image is inverted, and the mirror could be either concave or convex.
D) the image is upright, and the mirror could be either concave or convex.
E) the image is inverted, and the mirror is concave.
E
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A 125 g pendulum bob hung on a string of length 35 cm has the same period as when the bob is hung from a spring and caused to oscillate. What is the spring’s elastic constant?
A. 1.9 N/m B. 3.5 N/m C. 5.2 N/m D. 27 N/m
Uranus and Neptune have methane clouds but Jupiter and Saturn do not. Which factor explains why?
A) The stronger gravity on Jupiter and Saturn pulls methane downward so that it can't form clouds. B) Jupiter and Saturn do not contain any methane gas. C) The rapid rotation of Jupiter and Saturn prevents methane clouds from forming. D) Temperatures on Jupiter and Saturn are too high for methane to condense.
A 0.25-m string, vibrating in its sixth harmonic, excites a 0.96-m pipe that is open at both ends into its second overtone resonance. The speed of sound in air is 345 m/s. The common resonant frequency of the string and the pipe is closest to
A) 540 Hz. B) 360 Hz. C) 450 Hz. D) 630 Hz. E) 700 Hz.
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be ___________ the change in length of the Pyrex glass rod
a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times