While our two companions, the Magellanic Clouds, are irregulars, Andromeda's two companions, M-32 and M-110, are dwarf ellipticals
Indicate whether the statement is true or false
TRUE
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When a rocket is traveling toward a mountain at 100 m/s, the sound waves from this rocket's engine approach the mountain at speed V. If the rocket doubles its speed to 200 m/s, the sound waves from the engine will now approach the mountain at speed
A) 4V. B) 2V. C) V. D) V.
Decreasing the focal length of the eyepiece in a compound microscope by 50% changes the magnification to _______ times the previous magnification.
A. 0.50 B. 1.5 C. 1.7 D. 2.0 E. 4.0
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
a. 3.5 b. 49 c. 14 d. 43 e. 4.3
Which of the following explains why, about 13,000 years from now, Vega will be a better North Star than Polaris?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.