A man is moving by you at a speed close to the speed of light.Which of the following correctly summarizes the effects you would notice on his mass,size,and time?
A)His mass would be increased from its value at rest,his length would be decreased from its rest value but only in the direction in which he is moving,and his time would be running slower than yours.
B)His mass would be increased from its value at rest,his length,width,and height would all be decreased no matter what direction he is moving,and his time would be running slower than yours.
C)His mass would be decreased from its value at rest,his length would be decreased from its rest value but only in the direction in which he is moving,and his time would be running slower than yours.
D)His mass would be increased from its value at rest,his size would be increased,and his time would be running slower than yours.

Question

Quizplus · Accepted Answer

This is a correct statement of the effects of special relativity. As an object moves closer to the speed of light, its mass increases, its length contracts in the direction of motion (known as length contraction), and time dilation occurs, meaning that time appears to run slower for the moving object compared to a stationary observer. These effects have been experimentally verified. Choice B is incorrect because the dimensions in the perpendicular direction to motion do not change. Choice C is also incorrect because mass does not decrease with increasing speed in special relativity. Choice D is incorrect because an increase in speed does not result in an increase in size.

A Man Is Moving by You at a Speed Close