Waves on a String: What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? The density of brass is 8.60 × 103 kg/m3.
A. 0.121 m/s
B. 100 m/s
C. 136 m/s
D. 500 m/s
E. 68.8 m/s
Answer: C
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The Moon's angular diameter in our sky is measured to be 0.5°. From this, we can find
a. the mass density of the Moon if we know its distance from the Earth. b. diameter of the Moon if we know the Moon's distance. c. diameter of the Moon with no other information about the Moon. d. distance to the Moon with no other information about the Moon.
The second postulate of special relativity states that ____
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What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
A) R Coronae Borealis B) RR Lyrae C) Cepheid D) T Tauri E) Herbig-Haro
What can disrupt the evolutionary sequence of a star?
What will be an ideal response?