Physics Homework Quiz #8

In a special relativity analysis observers are moving with

• constant velocities

• constant accelerations

• increasing velocities

• increasing accelerations

Motion is relative because

• It always seems like you are moving

• You appear to be in a fixed position with things moving around you

• You seem to be moving compared to other fixed points

• Everything always appears to be moving

A frame of reference requires a

• fixed point

• a moving point

• a nicely carved frame

• a life changing experience

When thinking in terms of relativity

• Some fixed points are more important than others

• Your frame of reference is the most valid

• Frames of reference are equally valid

• The direction of observation is most important

It was thought light travelled through an ether because

• light was known to be particles

• light was known to act like waves

• there were places light didn't travel

• light gets stressed

The Michelson-Morley experiment showed that light

• light travelled the same distance in the same time regardless of direction

• that light was not travelling through an ether through which the Earth moved

• travelled at the same speed even when released from an object moving as quickly as the Earth

• All of the answers are correct

Select the correct postulates for Einstein's Special Relativity

• The laws of Physics are the same in all inertial reference frames

• The speed of light is the same in all inertial reference frames and is not affected by the speed of its source

• The speed of light is exactly 299,792,458 m/s

• The speed of light changes with the motion of the frame of reference

Observer B sees the two lamps flash simultaneously where Observer A sees ...

• Left hand lamp flashes first

• Right hand lamp flashes first

• Both lamps flash at the same time

• Neither lamp flashes

The diagram demonstrates the idea of

• time dilation

• the relativistic factor

• length contraction

• how to get space sick

The time measured by the astronaut is less than the time measured by the external observer because

• the speed of light is constant in all frames of reference

• light travels further, from the external observer, so takes longer

• light travels less distance in the astronauts point of view, so happens faster

• All answers are correct