Which of these binaries would appear most similar in color telescopically?
A) O2V and M4Ia
B) M1V and K9V
C) A2Ia and F7Ia
D) F3IV and G8III
E) F0V and G9III
B
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Minimal orbital speed about Earth is about 8 km/s, and about the Moon is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.
Two taut strings of identical mass per unit length are stretched with the same tension with their ends fixed, but one string is 0.330 cm longer than the other
Waves on these strings propagate at 34.0 m/s.The fundamental frequency of the shorter string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 12.3 Hz B) 9.00 Hz C) 12.0 Hz D) 12.7 Hz E) 11.3 Hz
The speed of light in a material is 1.74 × 10^8 m/s. What is the index of refraction of this material?
a. 1.72 b. 0.58 c. 1.74 d. 0.218
A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time