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Motion In Straight Line

Question
CBSEENPH11016995
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The light travels 100 m in vacuum and then 100 m in media in which velocity of light is 2.4 x 108 m/s. What is the average velocity of light?

Solution

Distance travelled by light in vacum is, S1 = 100m
Distance travelled by light in media is, S2 = 100m
Velocity of light in vacum is c = 3 x 108 m/s
Velocity of media is v = 2.4 x 108 m/s
Time taken by light to cover 100m in vacum is,
straight t subscript 1 fraction numerator 100 over denominator 3 cross times 10 to the power of 8 end fraction equals 1 third straight x 10 to the power of negative 6 end exponent straight s
Time taken by light to cover 100m in media is,
straight t subscript 2 equals fraction numerator 100 over denominator 2.4 cross times 10 to the power of 8 end fraction equals 5 over 12 cross times 10 to the power of negative 6 end exponent straight s
Total time is given by, 
straight t equals straight t subscript 1 plus straight t subscript 2 space equals open parentheses 1 third plus 5 over 12 close parentheses cross times 10 to the power of negative 6 end exponent space space equals 3 over 4 cross times 10 to the power of negative 6 end exponent straight s
 
Now average velocity is given by, 

top enclose straight v space equals fraction numerator 200 over denominator begin display style 3 over 4 cross times 10 to the power of negative 6 end exponent end style end fraction space space space equals 8 over 3 cross times 10 to the power of 8 straight m divided by straight s
       

Some More Questions From Motion in Straight Line Chapter

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?

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