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WorksheetsSpecial Relativity
Total questions: 35
Worksheet time: 37mins
A rocket leaves Earth and travels to a star that is 20 light years (one light year equals 9.46E15 meters) as seen by the Earth. The speed of the rocket is 0.8c relative to the Earth. The time for the trip as measured on by the astronauts in the spaceship is
25 years
20 years
15 years
12 years
A postulate is something that is accepted as true at the beginning of a logical argument.
True
False
A rocket leaves Earth and travels to a star that is 10 light years (one light year equals 9.46E15 meters) as seen by the Earth. The speed of the rocket is 0.8c relative to the Earth. The time for the trip as measured on Earth is
25 years
20 years
16 years
12 years
A passenger at the rear of a train traveling at 15 m/s relative to the ground throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. What is the velocity of the baseball relative to the ground as it leaves the thrower’s hand? In other words: how fast does a person on the ground see the ball move?
30 m/s
15 m/s
0 m/s
20 m/s
A dog and a cat are at a stand-off, running towards each other, both at 12 m/s. What is the magnitude of velocity of the cat relative to the dog?
12 m/s
24 m/s
0 m/s
6 m/s
There are two twins on Earth. One flies off on a spacecraft traveling 90% of 'c' while the other twin stays on Earth. Which of the following is TRUE?
The twin on the spacecraft will age more slowly than the Earth-bound sibling
Time in each frame of reference proceeds differently at different speeds
This is an example of the 'Twin Paradox'
All answers are true
The speed of light _________________.
is constant in all frames of reference
changes based on frame of reference
speeds up even faster in different frames of reference
stops when in different frames of reference
The speed of light (c) =
186,282 miles per second
300,000,000 meters per second
3.0 x 105 km/sec (kilometers per second)
All answers are correct and equal to one another
Consider two spaceships, each traveling at 0.50c in a straight line. Fergus' is moving directly away from the Sun and Blake's is approaching the Sun. The science officers on each ship measure the velocity of light coming from the Sun. What do they measure for this velocity?
Fergus' measures it as less than c, and Blake's measures it as greater than c.
Blake's measures it as less than c, and Fergus' measures it as greater than c.
On both ships it is measured to be less than c.
On both ships it is measured to be exactly c.
Lachlan's spaceship takes a nonstop journey to a planet and returns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the Earth?
3.2h
7.0h
15h
17h
A meter stick is moving toward you with a speed of 0.80c. What is its length?
zero
0.40m
0.60m
1.0m
Relative motion can best be defined as
the change in position of an object divided by change in time.
the amount of motion that an object experiences over a given period of time.
the motion of an object with a constant velocity.
the motion of one object as it appears to another object.
TRUE or FALSE
An inertial frame of reference is a reference is one which Newton's laws of motion are obeyed.
TRUE
FALSE
An observer notices that a clock moving with a speed of 0.650c advances 2.00 seconds. Is the corresponding elapsed time time on an identical clock at rest relative to the observer ____________ 2.00 seconds.
greater than
less than
equal to
An observer notices that a clock moving with a speed of 0.650c advances 2.00 seconds. How much time elapses on the identical clock at rest?
1.52 seconds
2.97 seconds
2.63 seconds
2.00 seconds
How long is a plank of wood at rest if its length when moving at 0.995c is 2.00 m?
.19974 m
20.0447 m
20.19974 m
0.0447 m
A set of twins, Abbey and Angelina, are initially 10 years old. While Angelina remains on Earth, Abbey rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Angelina), then turns around and comes back at 0.6c. When Abbey returns, Angelina is 20 years old. How old is Abbey upon her return?
10
12
18
20
At one point in time, two twins are 30 years old. At this time, one of them gets on a rocket and travels at 0.8 c, for what he experiences to be 12 years. How old is the twin that remained on Earth when the traveling twin returns home?
20 years
50 years
40 years
80 years
If a spaceship at a velocity of 0.8c fires a rocket at 0.7c, what is the speed of the rocket?
1.5c
0.1c
c
5.6c
As a spacecraft moving at 0.92c travels past an observer on Earth, the Earthbound observer and the occupants of the craft each start identical alarm clocks that are set to ring after 6.0 h have passed. According to the Earthling, what does the Earth clock read when the spacecraft clock rings?
15.3 h
2.4 h
75.0 h
39.1 h
