The density of a certain solid is 7.2 × 10^3 kg/m3, and its Young's modulus is 8.0 × 10^10 N/m2 . What is the speed of sound in this material?
a. 1.1 × 10^7 m/s
c. 3700 m/s
b. 5900 m/s
d. 3300 m/s
D
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Power: Jill does twice as much work as Jack does and in half the time. Jill's power output is
A. the same as Jack's power output. B. one-fourth as much as Jack's power output. C. one-half as much as Jack's power output. D. twice Jack's power output. E. four times Jack's power output.
Neptune has a larger fraction of methane in its atmosphere than Uranus
Indicate whether the statement is true or false
Novae are more closely related to type II than to type I supernovae
Indicate whether the statement is true or false
Which of the following is not a piece of evidence supporting the idea that Pluto is a large comet of the Kuiper belt?
A) Pluto's composition appears to match that of other known Kuiper belt comets. B) Triton, which must once have orbited the Sun before being captured by Neptune, is significantly larger than Pluto. C) Pluto grows a coma and a long tail when it is at the point in its orbit closest to the Sun. D) Pluto's orbit is very similar to the orbits of other known Kuiper belt comets. E) Pluto is not the largest object orbiting in the region of the Kuiper belt.