Exam 27: Spacetime and Gravity

Suppose you are in a spaceship accelerating away from Earth at 9.8 m/ s² (1 g),so that you can walk on the floor of your spaceship as though experiencing normal gravity on Earth.Is it possible for you to consider yourself to be at rest? Why or why not?

What is spacetime?

Which of the following best describes the current scientific view of possibilities of travel to distant parts of our galaxy (or universe)with such things as hyperspace,wormholes,or warp drive?

According to general relativity,how is time affected by gravity?

What do we mean by gravitational time dilation?

Why do we see a gravitational redshift in the spectrum of the Sun?

What evidence supports the predicted existence of gravitational waves?

Suppose Einstein had never lived and did not publish the special theory of relativity in 1905.According to most historians of science,when would someone else have discovered the theory?

Which of the following best describes what we mean by a worm hole?

If you launch two probes in opposite directions from the Space Station,they will meet as they orbit Earth.According to general relativity,why does this happen?

Briefly explain how the universe can be finite yet have no center and no edges.

What do we mean by dimension in the context of relativity?

Which of the following correctly describes what we mean by a great circle on the surface of Earth?

Gravitational time dilation can be observed in the spectra of atoms on the surface of the Sun.

When we look at pictures of distant objects in the universe,the images of the objects often are distorted by gravitational lensing.

Suppose you and a friend have very precise clocks.You are on the ground floor of a tall building and your friend is on the roof.Which of the following statements is true?

If you draw a spacetime diagram,the worldline of an object that is accelerating away from you is

If two straight lines start out parallel but eventually cross,then they must be in a

Which of the following is false?

Process of Science: The equivalence principle is a fundamental assumption of general relativity and cannot be experimentally tested.