1. Gloria is in a spaceship moving with constant velocity 50% of the speed of li
ID: 1775217 • Letter: 1
Question
1.
Gloria is in a spaceship moving with constant velocity 50% of the speed of light and detects Andy’s spaceship in the distance. If Andy and Gloria are indeed in equivalent reference frames, which of the following must be true?
Select one:
a. Their clocks in both reference frames move at the same rate.
b. The length of a ladder along the direction of motion is the same.
c. Physical laws in both reference frames are the same.
d. A bullet fired from the front of each ship has the same speed.
2.
Determine why corrections are needed for the internal clocks of GPS satellites.
Select one:
a. GPS satellites move at speeds that cause its clocks to slow relative to Earth.
b. GPS satellites break down over many years
c. GPS receivers need signals from 4 satellites to determine a 3D location.
d. GPS satellites have complex orbits
3.
Clock A and Clock B are synchronized and then Clock B is placed on a spaceship departing Earth at 80% the speed of light while Clock A stays on Earth. When the ship returns 10 years later and the clocks are compared, what is found?
Select one:
a. Clock A and Clock B show the exact same time.
b. Clock A shows more time has passed than Clock B.
c. Clock B shows more time has passed than Clock A.
d. Neither clock is correct.
4.
Antoine is a molecular exo-biologist on his way to a planet orbiting a star that is exactly 7 light years away from Earth to begin studying the suitability of the planet to support human life. He is eager to begin work as he says goodbye to his family and boards the spaceship for the long journey ahead.
Antoine is expecting additional supplies after he arrives at his destination. If his supplies were shipped out 3 months after he left Earth how long will he have to wait before his supplies arrive? Assume the ship his supplies are on has the same cruising speed as Antoine’s own vessel.
Select one:
a. Antoine has to wait 3 months for his supplies.
b. Antoine will have to wait 6 months for his supplies.
c. Antoine will have to wait more than a year for his supplies.
d. Antoine doesn’t have to wait; his supplies arrived before he did
5.
Which concept of special relativity is best understood by the thought experiment of a light clock?
Select one:
a. Impossibility of superluminal motion
b. Length contraction along the direction of motion
c. Time dilation in a moving frame of reference
d. Equivalence of inertial frames of reference
6.
Jim stands at the front of a space ship moving at 90% of the speed of light and fires a laser gun forward. Jim’s ship is moving past Steve who sees the ship moving at 90% of the speed of light away from him. From Steve’s point of view the laser light leaving the gun moves at:
Select one:
a. 190% of the speed of light
b. 10% of the speed of light
c. 90% of the speed of light
d. 100% of the speed of light
7.
Parker and Stan perform a simple experiment timing how long it takes a ball to drop while riding on a roller coaster and notice different results than when they perform the same experiments in the lab. What is the likely reason?
Select one:
a. On the roller coaster they don’t have as good equipment as in the lab.
b. On the roller coaster they are undergoing acceleration and non-uniform motion with respect to the lab.
c. The acceleration due to gravity on the roller coaster is different than the gravity in the lab.
d. On the roller coaster they have to deal with wind resistance which is not a factor in the lab.
8.
Halfway through his trip Antoine realized he forgot some things and had to radio back to Earth with additional shipping requests. How long does it take that message to reach Earth?
Select one:
a. Near instantly
b. Around 2.3 years
c. About 3.5 years
d. About 7 years
9.
What portion of a routine airplane flight can be considered a nonaccelerating frame of reference?
Select one:
a. Take-off from an airport
b. Landing at an airport
c. Turbulence during midflight
d. Cruising at a fixed altitude
Explanation / Answer
Answer to 1l
Option A is false because in gloria ship would run slow
Option B is false because length of ladder measured by gloria would be small
Option C is true because physical law would remain unchanged due to uniform motion
Option D is false because bullet would have some non-zero rest mass therefore its velocity would be different
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