Hubble's Law states that v = H0d, and current measurements indicate that H0 ? 22 kilometers per second per million light-years. About how far away is a galaxy with a redshift indicating that it is moving away from us at 2200 kilometers per second?
A) 100 million light-years
B) 200 million light-years
C) 200 light-years
D) 100 light-years
A) 100 million light-years
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Why do sunspots appear dark?
A. They are made of different material than the surrounding gases. B. They are cooler than the surrounding gases. C. Their magnetic fields block light. D. They are hotter than the surrounding gases.
A mixture of red and green pigments appears
A) orange. B) yellow. C) magenta. D) blue. E) muddy-brown.
At a distance of 10 m from a light bulb the rms value of the electric field is 16 V/m. What is the rms value of the electric field at a distance of 20 m from the light bulb?
A. 32 V/m B. 16 V/m C. 8.0 V/m D. 4.0 V/m E. 2.0 V/m
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