Velocity Addition: Two spaceships approach Earth from opposite directions. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A. 0.51c
B. 0.55c
C. 0.58c
D. 0.61c
E. 0.64c
Answer: A
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An object travels 8 m in the 1st second of travel, 8 m again during the 2nd second of travel, and 8 m again during the 3rd second. Its acceleration is
A) 0 m/s2. B) 5 m/s2. C) 8 m/s2. D) 10 m/s2. E) more than 10 m/s2.
The temperature of a sample of water increases from 20°C to 46.6°C as it absorbs 5650 calories of heat. What is the mass of the sample? (Specific heat of water is 1.0 cal/g °C)
B) 622 g
C) 212 g
D) 310 g
According to current theories, how did the sun's planets get here?
A) Stars such as the sun, and planets such as those around the sun, all formed shortly after the big bang, and then gathered into "solar systems" such as we see today. B) Part of the gas and dust that gathered together to form the sun went into orbit around the sun instead of falling into the sun, and this part formed the planets. C) The sun was originally part of the two-star system, the second star split up into pieces, and these pieces developed into the planets. D) A passing star tore off part of the sun, and this part separated into pieces to form the planets. E) After the sun had formed, it gathered fully-formed planets from various places as the sun moved through the galaxy.
Light from white dwarfs shows a gravitational redshift
Indicate whether the statement is true or false