Light takes approximately one second to travel from the Earth to the Moon. This means that the Moon is approximately
A) 1 astronomical unit from the Earth.
B) 300,000 kilometers from the Earth.
C) 3,000 kilometers from the Earth.
D) 1 light year from the Earth.
E) twice the distance from the Earth to the Sun.
C
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How do we know where comets come from?
How do we know where comets come from?
- The comets from the Oort cloud don’t produce a tail, but those from the Kuiper belt do
- Those that come from the Kuiper belt are composed of slightly different materials than those from the Oort cloud
- Astronomers only guess where these comets come from, they don’t know for sure
- The comets from the Oort cloud travel at much greater velocities than those from the Kuiper belt
- The comets from either location have a trajectory or pathway that can be traced back to their starting point once we see them
If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's:
A) transverse motion. B) radial motion. C) parallax shift. D) Doppler shift. E) true space motion.
A 328-kg car moving at 19.1 m/s in the +x direction hits from behind a second car moving at in the same direction
If the second car has a mass of and a speed of right after the collision, what is the velocity of the first car after this sudden collision? A) 18.2 m/s B) -14.0 m/s C) 24.2 m/s D) 14.0 m/s
The energy used by a 100 watt light bulb in 1 hour is __________
Fill in the blank(s) with correct word