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If you lok out of the window of a fast m...

If you lok out of the window of a fast moving train the nearby trees, houses etc,. Seem to move rapidly in a direction opposite to the train's motion, but the distant objects seem to be stationary. Why?

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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STATEMENT -1 : For an observer looking out through the window of a fast moving train , the nearby objects appear to move in the opposite direction to the train , while the distant objects appear to be stationary . STATEMENT - 2 : If the observer and the object are moving at velocities vec v_(1) and vec v_(2) respecttively with refrence to a laboratory frame , the velocity of the object with respect to a laboratory frame , the velocity of the object with respect to the observer is vecv_(2) - vecv(1) . (a) Statement -1 is True, statement -2 is true , statement -2 is a correct explanation for statement -1 (b) Statement 1 is True , Statement -2 is True , statement -2 is NOT a correct explanation for statement -1 (c) Statement - 1 is True , Statement -2 is False (d) Statement -1 is False, Statement -2 is True

A trolly of mass 200kg moves with a uniform speed of 36 km // h on a frictionless track. A child of mass 20kg runs on the trolly from one end to the other (10m away) with a speed of 4m//s relative to the trolly in a direction opposite to the trolly's motion and jumps out of the trolly. How much has teh trolly moved from the time the child begins to run ?

A boy on a train of height h_1 projects a coin his friend of height h_2 standing on the same train, with a velocity v relative to the train, at an angle theta with horizontal. If the train moves with a constant velocity v' in the direction of x - motion of the coin, find the (a) distance between the boys so that the second boy can catch the coin, (b) maximum height attained by the coin, and ( c) speed with which the second boy catches the coin relative to himself (train) and ground.

Some gas at 300K is enclosed in a container. Now the container is placed on a fast moving train. While the train is in motion, the temperature of the gas

A man is sitting inside a moving train and observes the stationary objects outside of the train. Then choose the single correct choice from the following statements -

A train is moving slowly on a straightly track with a constant speed of 2 ms^(-1) . A passenger in the train starts walking at a steady speed of 2 ms^(-1) to the back of the train in the opposite direction of the motion of the train . So, to an observer standing on the platform directly in the front of that passenger appears to be

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AAKASH SERIES-UNITS AND MEASUREMENTS-EXERCISE- 1 B
  1. The physical quantities not having same dimensions are

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  2. A dimensionless quantity

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  3. If you lok out of the window of a fast moving train the nearby trees, ...

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  4. A : PARSEC and light year, both measure time R : Both have dimension...

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  5. A : A unitless physical quantity must be dimensionless. R : A pure n...

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  6. A : Absolut error is unitless and dimensionless. R : All type of err...

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  7. A : Higher is the accuracy of measurement, if instrument have smaller ...

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  8. A : The maximum possible error in a reading is taken as least count of...

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  9. A : In a measurement, two readings obtained are 20.004 and 20.0004. Th...

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  10. A : Out of the measurements A = 20.00 and B = 20.000, B is more accura...

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  11. A : All physically correct equations are dimensionally correct. R : ...

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  12. A : Physical relations involving addition and subtraction cannot be de...

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  13. A : An exact number has infinite number of significant digits. R : A...

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  14. A : A dimensionless quantity may have unit. R : Two physical quantit...

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  15. If Q=(x^n)/(y^m) and Deltax, Deltay are absolute errors in the measure...

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  16. State true or false: A point has no dimensions.

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  17. Ampere second is a unit of

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  18. (A): The distance of a star from earth can be measured by parallax met...

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  19. A unitless quantity

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  20. A more accurate measure of biomass will be in terms of

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