Sunday, 27 January 2019

11 PHYSICS

By Fasaludeen PK January 27, 2019 , 4 comments

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4 comments:

  1. Fasaludeen PK5 February 2019 at 14:25

    Can there be a physical quantity that has no units and no dimensions?

    Yes, Strain has no unit and no dimensions.

    ReplyDelete
  2. Fasaludeen PK5 February 2019 at 14:30

    Can a body have zero velocity and non-zero acceleration?

    Ans:
    Yes. A body thrown vertically upwards has zero velocity at its highest point. But at the highest point it has an acceleration equal to acceleration due to gravity.

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  3. Fasaludeen PK5 February 2019 at 14:34

    Is it possible to have a negative value for the scalar product of two vectors?

    Ans:
    Yes. If the angle between the two vectors lies between 90° and 270°, their scalar product will be negative.

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  4. Fasaludeen PK5 February 2019 at 16:16

    When an air bubble rises in water, what happens to its potential energy?

    Ans:
    Potential energy of an air bubble decreases because work is done by upthrust on the bubble.

    ReplyDelete