The night sky is dark because the universe is not infinitely old
Indicate whether the statement is true or false
T
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If H equals 50 km/sec/Mpc, then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc
Indicate whether the statement is true or false
The Doppler effect is sensitive only to motion along the line of sight
a. True b. False Indicate whether the statement is true or false
A transformer is to be designed to increase the 30 kV rms output of a generator to the transmission-line voltage of 345 kV rms. If the primary winding has 80 turns, how many turns must the secondary have?
A. 6 B. 70 C. 920 D. 9200 E. 12
As you walk away from a plane mirror on a wall, the height of your image
A) is always the same size. B) is always a real image, no matter how far you are from the mirror. C) gets smaller. D) changes from being a virtual image to a real image as you pass the focal point. E) may or may not get smaller, depending on where the observer is positioned.