The fastest motion that can be measured in any frame of reference is \(300,000 \text{ km/s}\), which is the speed of light in a vacuum.
What is the fastest motion that can be measured in any frame of reference? (1 point)
•186,000 km/S
•186,000 m/s
•300,000 km/s
•300,000 m/s
5 answers
Are you sure
Yes, I am sure. The speed of light in a vacuum is approximately \(300,000 \text{ km/s}\) (or more precisely \(299,792,458 \text{ m/s}\)). This speed is considered the ultimate speed limit in the universe according to the theory of relativity, meaning that nothing can travel faster than this speed in any frame of reference.
So the correct answer to your original question is indeed 300,000 km/s.
Two people are on a train that is moving at 10 m/s north. They are walking 1 m/s south relative to the train.
Relative to the ground, their motion is 9 m/s north.
Why are we able to use these motions to describe the motion relative to the ground?
• The mation of everything in the Universe besides light can be described in this way. g
© The people are moving much slower than the speed of light so the ground acts as a frame of reference.
it one object is moving much slower than the speed of light, its speed can be added to that of another object.
As long as the frame of reference is stationary, all motion can be described in this way.
Relative to the ground, their motion is 9 m/s north.
Why are we able to use these motions to describe the motion relative to the ground?
• The mation of everything in the Universe besides light can be described in this way. g
© The people are moving much slower than the speed of light so the ground acts as a frame of reference.
it one object is moving much slower than the speed of light, its speed can be added to that of another object.
As long as the frame of reference is stationary, all motion can be described in this way.
The correct answer is:
"If one object is moving much slower than the speed of light, its speed can be added to that of another object."
In classical mechanics, when dealing with speeds that are significantly less than the speed of light, we can use simple vector addition to determine the relative velocities between objects. The speeds of the train and the people walking can be added or subtracted straightforwardly to find their motion relative to a stationary frame, such as the ground. This approach is valid because relativistic effects become significant only as objects approach the speed of light.