If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy.
B) Nothing.
C) The Sun would not be disturbed, but the solar system would be ripped apart.
D) The Sun will turn into a red giant and explode.
B
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A billiard ball (ball #1) moving at 5 m/s strikes a stationary ball (ball #2) of the same mass. After the collision, ball #1 moves at a speed of 4.35 m/s. Find the speed of ball #2 after the collision.
a. 1.25 m/s b. 1.44 m/s c. 2.16 m/s d. 2.47 m/s e. 2.68 m/s
The Bacteria Chloroflexus live in live in lakes, rivers, hot springs, and aquatic environments with very high salt contents. They obtain energy from the Sun and carbon from other bacteria. Given this, they can be classified metabolicaly as
A) photoheterotrophs B) chemoautotrophs C) chemoheterotrophs D) photoautotrophs
A current of 6.0 A flows through a resistance of 50 ?. How much power is dissipated?
You are traveling at close to the speed of light, on your way back to Earth from a distant star. In your own reference system of the space ship, compared with the reference system of Earth,
a. the travel time to Earth is shorter and the distance to Earth is the same. b. the travel time to Earth is longer and the distance to Earth is the same. c. the travel time to Earth is shorter and the distance to Earth is longer. d. the travel time to Earth is longer and the distance to Earth is longer. e. the travel time to Earth is shorter and the distance to Earth is shorter.