Physics Relativity Level: High School
When it comes near a heavy nucleus , a gamma ray , which is high energy photon can “disappear”, and in its place three will be produced an electron and a positron, which both have mass , This pair production is an example ofa) time dilation
b) length contraction
c) the equivalent of mass and energy
d) the principle of relativity
e) None of the above
Physics Relativity Level: High School
The prediction of special relativity that the length of a moving object will be shortened in the direction of motion is ?a) time dilation
b) length contraction
c) the equivalence of mass and
d) the principle of relativity
e) None of the above
Physics Relativity Level: High School
At what speed does a clock have to move in order to be seen to run at a rate that is one-half the rate of a clock at rest ?
Physics Relativity Level: High School
At what speed does a clock have to move in order to be seen to run at a rate that is one-half the rate of a clock at rest ?
Physics Relativity Level: High School
A rocket moves with a velocity of 0.92 c to the right with respect to a stationary observer A. An observer B moving relative to observer A finds that the rocket is moving with a velocity of 0.95 c to the left . What is the velocity of the observer B relative to observer A ? (Hint : Consider observer B’s velocity in the frame of reference of the rocket ? )
Physics Relativity Level: High School
A supertrain of proper length 100 m travels at a speed of 0.95 c as it passes through a tunnel having proper length 50.0m. As seen by a trackside observer , is the train ever completely within the tunnel ? If so , by how much ?
Physics Relativity Level: High School
A certain quasar recedes from Earth at v = 0.870 c . A jet of material ejected from the quasar back toward Earth moves at 0.550 c relative to the quasar . Find the speed of the ejected material relative to earth ?
Physics Relativity Level: High School
A rocket moves with a velocity of 0.92 c to the right with respect to a stationary observer A. An observer B moving relative to observer A finds that the rocket is moving with a velocity of 0.95 c to the left . What is the velocity of the observer B relative to observer A ? (Hint :Consider observer B’s velocity in the frame of reference of the rocket ? )
Physics Relativity Level: High School
A supertrain of proper length 100 m travels at a speed of 0.95 c as it passes through a tunnel having proper length 50.0m . As seen by a trackside observer, is the train ever completely within the tunnel ? If so , by how much ?
Physics Relativity Level: High School
A noted physicist was stopped by police for traveling through a red traffic light . The physicist urged that to because he was traveling fast the colour of the light had changed from the red wavelength to that of a green wavelength . The judge said he would let him off the charge of running a red light , but would fine him for speeding at the rate of one cent of every km/hr he was traveling over 100 km/hr .Was he fined ? and how much was his fine ?
(Assume c = 3 x 10^9 ms-1; Frequency of red light = 4.5 x 10^14 Hz ; Green light = 6.0 x 10^14 Hz )
Physics Relativity Level: High School
Two twins , Bill and Ben are 18.0 years old and they leave Earth for a distant planet 10.0 light years away. The twins depart at the same time on Earth , and travel in different space ships . Bill travels at 0.90 c , while Ben travels at 0.50 c . What is the difference between their ages when Ben arrives on the new planet ?
Physics Relativity Level: High School
Suppose the speed of light was 120 kmhr^-1 .a. How would a length of a bus traveling at 110 kmhr^-1 appear to some one standing on the side of the road ?
b. If your mass was 65 kg on getting on the bus , what would it appear to be from the point of view of someone standing on the side of the road ?
c. How long would it seem to take the bus to travel from Brisbane to Sydney (a distance of 1000 km ) if the average speed was 100 kmhr^-1?
Physics Relativity Level: High School
Later in the journey , Ken , a crewmember on the starship , receives a worried e-mail from his girlfriend , on Earth , because Ken appears to have put on twenty per cent more weight as when he left earth . But when Ken looks in the mirror , he sees no difference . What speed is Ken likely to be traveling ?(a) How would Barbie describe Ken now ?
Physics Relativity Level: High School
On Earth, the crew of the starship MacGregIV has an average mass of 55 kg . What do you expect their mass to be traveling at 0.90 c ?
Physics Relativity Level: High School
As the starship passes by the moon at 0.90 c , the moon base measures the length of the starship as 160 m . What do you expect the length of the starship to have been when it was made on earth ?