Light takes 4.3 years to travel from Alpha Centauri (the star closest to the Sun) to the Earth. If a spaceship traveling near the speed of light were to make the same trip, the time to travel this distance as measured by the astronauts would be
A. 4.3 years.
B. less than 4.3 years.
C. a little more than 4.3 years.
D. longer than the lifespan of a human being.
Answer: B
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Mort stands on Earth. Velma moves away from him in a rocket at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma
As the tip of the beam passes her rocket, Mort observes the beam to move just 1000 km/s faster than Velma, while Velma observes the beam to move at 300,000 km/s. Whose observation is correct? A) Mort's B) Velma's C) both D) neither
There was a very rapid expansion period called inflation early in the history of the universe. When was this?
A: 10^43 to 10^42 seconds B: 10^35 to 10^33 seconds C: 10^12 to 10^11 seconds D: 1^3 seconds E: 100^200 seconds
If an object's acceleration is nonzero, its velocity must be __________
Fill in the blank(s) with correct word
In order to conserve fuel, you modify your car by removing 100 kg of excess weight. How much energy is saved each time you drive up a 3 km high mountain?
a. 
b. 
c. 
d. 