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Science
Physics
Relativity
Chapter 15&16 test-physics
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Gravity
Terms in this set (40)
In 4D geometry, lines of shortest distance are called
Geodesics
If Einstein's equations of special relativity are valid, they must
A, B, and C
The principle of ______ states that local observations made in an accelerated frame of reference cannot be distinguished from observations made in a Newtonian gravitational field.
Equivalence
To calculate how much rest energy an object contains, you multiply
Its mass times the speed of light squared
During a solar eclipse, you have the opportunity to observe stars around the periphery of the sun with a telescope. Which of the following is an observation that you would expect to make?
The starlight is deflected.
In general relativity, gravitational red shift is caused by
The slowing of clocks due to lower gravitational potential energy
In physics lab, you conduct an experiment to evaluate the difference that changing a particle's speed makes in its momentum. You send an electron at a speed of 99% that of light through an chamber that has a magnetic field inside and notice that the electron's path curves sharply. If you send an electron at a speed of 99.9% of the speed of light through the same chamber, you would notice
A smaller curve in the path the electron takes
Relativity equations for time, length, and momentum hold true for
Both a and b
According to the well known equation e=mc^2,
Mass and energy are related
You are communicating with aliens on Jupiter and Saturn... What would the sun of the angle in the triable formed by the paths our messages take?
A number larger than 180 degrees
The correspondence principle says that
Any new theory must agree with the old correct theory
According to Einstein, tossed balls curve because of a force of gravity
False
If you travel in a spaceship moving close to the speed of light, your speed will increase more than our inertia increases
False
In the presence of strong gravitational fields, 4D geometry must be used in place of Euclidean geometry
True
The sun's mass is decreasing
True
As an object approached the speed of light, it's momentum decreases dramatically
False
Mass and energy are two different states of the same thing
True
You are throwing a baseball in a spaceship launching upwards front Seth at close to the speed of light. According to Einstein, you will be able to detect that the downward niece meant of the baseball is due to gravity and not acceleration
True
What is the energy equivalent of 5.0 kg of mass
4.5x10^17
The fractional change of mass to energy in a fission reactor is about 1 part in a thousand. If 1.0 kg of uranium undergoes fission, what amount of energy is released?
9x10^13
To a person who is inside an spaceship moving close to the speed of light, a meter stick held horizontally inside the spaceship looks
Just the same as always
The reason the correspondence between mass and every has been only recently discovered is that
All of the above
A woman standing on the ground sees a rocket ship move past her at 95% the speed of light. Compared I the rocket at rest, the woman sees the rocket's length as
Shorter
In some reference frame in the universe, you, right now, are traveling at a speed close to the speed of light
True
When you approach a light source that in turn is moving towards you, your speed relative to the emitted light waves
Stays the same
The frequency of a light source doubles as the light approached you. As the same light specs moves away from you at the same speed it's frequency
Is halved
Suppose we observe lift bouncing back and forth between two vertical clock mirrors in a space ship that is whizzing past us at a very high speed. Compared to what the person in the spaceship sees, we see the spaceship clock as running
Slow
If you are moving in q high speed spaceship relative to the earth, you would
None of the above
Compared to time kept on earth, there is a physical slowing of time when you travel at
Both a and b
Einstein reasoned that
All of the above
When we move around through space just a little bit, we are moving
Mostly through time and only a little bit through space
A spaceship lease a space station and emits a flash of light... 300,000 km/s... 1/4 speed of light... 99/100 the speed of light.
300,000 km/s
Just as it is possible to travel around in a spaceship and come back to earth at a time much further in the future, it is also possible to travel around and come back to earth at some time in the past
False
Whenever we move we alter the rate at which we move into the future
True
The faster a person travels the more that time is dilated
True
A postulate of special relativity says that the laws of nature are the same in all uniformly moving reference frames
True
There is no physical experience tee can do inside a secluded room to determine our state of accelerated motion
False
Einstein reasoned that spread and time are two parts is one whole called space-time
True
A woman 1.70 m tall lies along the axis of a space vehicle traveling at 0.95 c. What is her heigh as measured by a stationary observer
0.53 m
Consider and object with a length at rest of 5 meters. When it approached the speed of light an observer at rest would measure it's length approaching what value
Zero
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