The center of the Milky Way galaxy must be less than 1 AU in diameter and contain at least 4 million solar masses. Therefore, the center of the Milky Way galaxy must be a ____________________,
Fill in the blank(s) with correct word
supermassive black hole
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A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes
What is the magnitude of the gravitational force exerted on the satellite by the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)
The most important property of a star which determines its evolution is its
A) chemical composition B) surface temperature C) mass D) radius
You see colors in a rainbow because of __________
Fill in the blank(s) with correct word
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
a. 0 b. 15 c. 29 d. 63 e. 250