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WorksheetsRelativity Questions
Total questions: 16
Worksheet time: 15mins
If the speed of light were infinite but the postulates of special relativity still held, then
any moving object would have infinite momentum
time dilation would be obvious at low speeds
length contraction would not occur
objects could have negative kinetic energy
Assume a gram of a substance marketed as “Pure Energy” is annihilated by a gram of a second substance “Anti-Pure Energy.” How long would the energy released power a city which uses 109 watts of power?
40 hrs
25 hrs
50 hrs
65 hrs
A spaceship leaves Earth and maintains a constant force by means of a nuclear engine. As the speed of the spaceship increases, an observer on Earth finds that relative to her the magnitude of the spaceship’s acceleration is
0
decreasing
constant
increasing
Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.8c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.)
Yes; 0
Before; 1x10–3 s
After; 1x10–3 s
Before; 1.3x10–3 s
An object moving at a relativistic speed past a stationary observer appears to
have length expanded and have a faster clock
have length contracted and have a slower clock
have length contracted and have a faster clock
have length expanded and have a slower clock
A spaceship, moving away from the Earth at a speed of 0.9c, fires a light beam backward. An observer on Earth would see the light arriving at a speed of
1.9c
0.1 c
c
more than 0.1c but less than c
An electron has a kinetic energy that is twice its rest energy. Determine its speed.
0.76 c
0.81 c
0.94 c
0.54 c
If you were to travel at a speed close to the speed of light, you would notice which of the following?
Your mass has increased.
Your pulse rate has decreased.
Your ship has contracted
You would notice none of these effects because you are in an inertial frame.
A difference between the special and general theories of relativity is that
special relativity deals with accelerated system
general relativity deals with accelerated systems
special relativity is valid only in stationary reference frames
general relativity only deals with swiftly moving objects
The purpose of the Michelson-Morley experiment was to
determine the velocity of light
detect possible motion of the Earth relative to the sun
detect possible motion of the sun relative to the ether
detect possible motion of the Earth relative to the ether.
Two identical atomic clocks are made. One is placed in the foothills of the Rocky Mountains at the NIST in Boulder, Colorado, about one mile above the sea level, and the second is flown in a GPS satellite around Earth at about 17,000 mph. Which clock gets ahead of the other?
The clock in orbit
The Boulder clock
Both clocks run at the same rate
E
An object with a nonzero rest mass moving at the speed of light would have
no momentum.
time pass at an infinitely fast rate
infinite volume
infinite apparent mass
Black holes cannot be observed directly, because they emit no light. However, a scientist can hunt for black holes because
a black hole will reflect light.
a black hole will reflect light.
black holes can gravitationally influence the orbits of nearby stars, and those stars can be observed.
magnetic fields cause an emanation of thermal energy in the form of high-speed protons.
An object that appears green in empty space is placed near but not in a black hole. To an observer far from the black hole, the object would appear
red
green
blue
black
The half-life of a muon is 2.2 µs. How fast is it moving relative to an observer who says its half-life is 4.4 µs?
0.87 c
0.75 c
0.97 c
0.72 c
A spaceship moves at a speed of 0.95 c away from the Earth. It shoots a star wars torpedo toward the Earth at a speed of 0.90 c relative to the ship. What is the velocity of the torpedo relative to the Earth?
–0.35 c
0.35 c
0.06 c
–0.06 c
