PART - 1 CH - 5Work, Energy and Power — Physics STD 11 Science — Question

You are walking along a seashore and a mild wind is blowing. Is the motion of air a wave motion?

When two quarter balls collide with each other, what type of collision occurs?

Can we define specific heat capacity for an adiabatic process?

Which of the following examples represent periodic motion? An arrow released from a bow.

Textbooks on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.

State with reasons, whether the following algebraic operations with scalar and vector physical quantities are meaningful:

1. adding any two scalars.
2. adding a scalar to a vector of the same dimensions.
3. multiplying any vector by any scalar.
4. multiplying any two scalars.
5. adding any two vectors.
6. adding a component of a vector to the same vector.

On which law is the working principle of hydraulic press and hydraulic brakes based?

A hollow sphere, a solid sphere, a disc and a ring all having same mass and radius are rolled down on an inclined plane. If no slipping takes place, which one will take the smallest time to cover a given length?