Which of the following describes a major challenge of interstellar travel at near light speed?
A) Supernova explosions could destroy spaceships passing nearby.
B) Asteroid fields floating in interstellar space will present a severe navigational challenge.
C) Any interstellar journey will take much longer than the lives of the crew members.
D) Time dilation will slow the heartbeats of the crew to a dangerously low rate.
E) Atoms and ions in interstellar space will hit the spacecraft like a flood of dangerous cosmic rays.
E
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Charge in an Electric Field: A particle with a charge of +4.0 ?C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A. 4.1 × 104 N/C B. 8.2 × 104 N/C C. 4.4 × 104 N/C D. 1.2 × 104 N/C E. 5.1 × 104 N/C
The distance to the Andromeda Galaxy is estimated at about 2 × 10^6 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 × 10^8 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 × 10^7 s)
a. 10 × 10^15 m c. 2 × 10^22 m b. 1 × 10^18 m d. 6 × 10^12 m
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