Which of the following can you observe about Venus with the naked eye?
a. Venus sometimes shines brightly in the eastern sky shortly before dawn
b. Venus is visible at midnight when it is in its full phase
c. When Venus is brightest, it is visible all night long
d. Venus sometimes shines brightly in the western sky shortly after sunset
Answer:
a. Venus sometimes shines brightly in the eastern sky shortly before dawn
d. Venus sometimes shines brightly in the western sky shortly after sunset
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If Hubble's constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?
a. 4100 Mpc b. 0.014 Mpc c. 67 Mpc d. 74 Mpc e. 300,000 Mpc
The primary reason the Moon lacks an atmosphere is because
A. the Moon lacks sufficient gravity to retain an atmosphere. B. the Moon is made up of the wrong kinds of rocks to release atmospheric gases. C. there is no life on the Moon. D. Earth's gravity pulls away any atmosphere the Moon collects.
A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 36.2 m/s if air resistance is negligible
The time when the ball strikes the ground is closest to A) 9.4 s B) 9.0 s C) 8.7 s D) 9.7 s E) 10 s
What is a shock wave?
a. A wave caused by an earthquake. b. Any loud sound moving through the air. c. The edge of the pressure cone caused by superimposed waves from an object moving faster than sound. d. The point of the pressure cone caused by superimposed waves. e. The distance from the crest to the trough of a set of waves.