An artificial satellite in a low orbit circles the earth every 98 minutes. What is its angular speed in rad/s?
What will be an ideal response?
0.0011 rad/s
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Assume that Hubble's constant is 22 kilometers per second per million light-years. Then we would expect a galaxy 100 million light-years away to be moving (Assume the motion is due only to Hubble's law.)
A) away from us at 2,200 km/s B) away from us at 220 km/s C) toward us at 2,200 km/s D) away from us at 22,000 km/s
Consider a vibrating guitar string that makes a sound wave that moves through the air. As the string moves up and down, the air molecules that are a certain horizontal distance from the string will move:
a. up and down. b. toward and away from the guitar string. c. back and forth along the direction of the length of the string. d. in circles around the guitar string.
Until recently, most astronomers thought elliptical galaxies were shaped like oblate spheroids
Indicate whether the statement is true or false
What are fossil fuels?
A) any fuel that releases CO2 into the atmosphere upon burning B) any fuel that is extracted from the interior of Earth C) mineral-rich deposits from ancient seabeds D) the carbon-rich remains of plants that died millions of years ago E) carbonate-rich deposits from ancient seabeds