7535

Physics Relativity Level: Misc Level

A rectangular billboard in space has the dimensions 10 meters by 20 meters. How fast and in what direction with respect to the billboard would a space travler have to pass for the billboard to appear square?

7534

Physics Relativity Level: Misc Level

How long would a meter stick appear if it were travelling like a properly thrown spear at 99.5% of the speed of light?

7533

Physics Relativity Level: Misc Level

State and explain the principle of equivalence. Please also provide one or two simple examples.

7532

Physics Relativity Level: Misc Level

Define;A) Time dilation, B,) Mass-Energy equivalence

7531

Physics Relativity Level: Misc Level

Suppose a person riding on top of a freight car shines a searchlight beam in the direction in which the train is traveling.Compare the speed of the light beam relative to the ground when; A) The train is at rest. B) The train is moving.How does the behaviour of the light beam differ from the behaviour of a bullet fired in the same direction from the top of the freight car?

7478

Physics Relativity Level: Misc Level

What would be the speed of an observer be if a red (4.688 x10^14 Hz) traffic light apppeared green (5.555 x10^14 Hz) to the observer? (a) 4.445 x10^8 m/s

(b) 2.219 x 10^8 m/s

(c) 8.438 x 10^7 m/s

(d) 5.548 x 10 ^7 m/s

(e) 2.890 x 10 ^6 m/s

6135

Physics Relativity Level: Misc Level

A certain quasar recedes from Earth at v=0.870c. A jet of material ejected from teh quasar back toward Earth moves at 0.550c relative to the quasar. Find the speed of the ejected material relative to Earth.

6133

Physics Relativity Level: Misc Level

A supertrain of proper length 100 m travels at a speed of 0.95 c as it passes through a tunnel having proper length 50m. As seen by a trackside observer, is the train ever completely within the tunnel? If so, by how much?

6119

Physics Relativity Level: Misc Level

A rectangular billboard in space has the dimensions 10 meters. by 20 meters. How fast and in what direction with respect to the billboard would a  space traveler have to pass to for the billboard to appear square?

6118

Physics Relativity Level: Misc Level

Suppose a person riding on top of a freight car shines a searchlight beam in the direction in which the train is traveling. Compare the speed of the light beam relative to the ground when:

a.The train is at rest. b. The train is moving. How does the behavior of the light beam differ from the behavior of a bullet fired in the same direction from the top of the freight car?

6113

Physics Relativity Level: Misc Level

A rocket ship leaves the earth at a speed of 0.800 c. Find the following : a) How much time does it take for the rocket to travel a distance of 2x1016 m as measured on earth?

b) How much time does it take a person on the rocket as measured on the rocket?

c) What is the distance as measured by someone on the rocket for the 2x1016 m?

6061

Physics Relativity Level: Misc Level

If your twin is riding in a spaceship going one-fifth the speed of light (v=C/5), how much has he aged after you've   aged exactly 1 year? answer in units of years.

6060

Physics Relativity Level: Misc Level

You,re riding in a very fast train from Chicago to Detroit. In Chicago you set your watch to correct time, but as you ride through downtown Detroit, you notice that your watch differs from the time shown on the clocks in the station! Are all the clocks in Detroit wrong, or is your watch broken?Or is something else going on?Explain.

5109

Physics Relativity Level: Misc Level

A person on a rocket sees an earth -bound observer to be increasing in apparent width. Simultaneously, the earth- bound observer sees the mass of the rocket to be (A)increasing (B) decreasing(C) remaining the same. Please explain your choice.

5060

Physics Relativity Level: Misc Level

On a pleasure cruise a boat is traveling relative to the water at a speed of 5.0 m/s due south. Relative to the boat, a passenger walks toward the back of the boat at speed of 1.5 m/s.

a) What is the magnitude and direction of the passenger s velocity relative to the water ?

b) How long does it take for the passenger to walk a distance of 27 m on the boat?

c) How long does it take for the passenger to cover a distance of 27 m on the water?

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