What is a major limitation in the Doppler method for detecting extrasolar planets?
A) it is better at finding massive planets like Jupiter rather than small planets like the Earth
B) it is best suited to finding planets which orbit relatively close to their star
C) it requires the use of fairly large telescopes and long exposures which limits the number of star that can be studied
D) all of these are major limitations
D
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Intensity of Sound: Two people are talking at a distance of 3.0 m from where you are, and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers. Calculate a reasonable estimate for the sound intensity that the other student measures.
A. 6.2 × 10-8 W/m2 B. 1.5 × 10-7 W/m2 C. 8.3 × 10-8 W/m2 D. 7.8 × 10-7 W/m2 E. 2.5 × 10-8 W/m2
A cart has an initial velocity of 5.0 m/s to the right and a constant acceleration of 2.0 m/s2 to the right. What is the cart's displacement during the first 6.0 s of this motion?
A) 10 m B) 55 m C) 66 m D) 80 m
About 74% by mass of Earth's crust is composed of the two elements
a. oxygen and iron. b. aluminum and iron. c. oxygen and silicon. d. silicon and aluminum.
The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both ends is 200. m/s. Which one of the following is not a resonant frequency of this string?
A) 50 Hz B) 200 Hz C) 25 Hz D) 100 Hz