Beats: The wavelengths of the sounds produced by two horns are 6.0 m and 7.0 m, respectively. What beat frequency is heard when the horns are sounded on a day when the speed of sound is 340 m/s?
A. 5 Hz
B. 6 Hz
C. 7 Hz
D. 8 Hz
Answer: D
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A uniform solid sphere has a moment of inertia I about an axis tangent to its surface. What is the moment of inertia of this sphere about an axis through its center?
A) 1/7 I B) 2/7 I C) 2/5 I D) 3/5 I E) 7/5 I
The proton storms in the solar wind travel at almost the speed of light
Indicate whether the statement is true or false
The metamorphism of coal to anthracite occurs due to
A) high pressure and high temperature. B) high temperatures. C) contact metamorphism. D) crystallization of organic matter.
Estimation: A marathon race is 26 mi and 385 yd long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of feet/stride.
A. 4.5 × 104 strides B. 4.5 × 103 strides C. 4.5 × 105 strides D. 4.5 × 106 strides