Units and Measurements — Physics STD 11 Science — Question

Two particles of masses m, and m, attract each other gravitationally and are set in motion under the influence of the gravitational force? Will the centre of mass move?

Name the scientist and the country of his origin whose field of work was 'cosmic rays'.

Define the effect of shape of the earth on the value of g.

If the weight of an object in air is W grams and its weight in water is W₁ gm then what will be the buoyancy force of water on the object?

The number of molecules in a container is doubled, what will be the effect on the rms speed of molecules?

What are the S.I. and C.G.S. units of heat? How are they related?

At what position is the restoring force maximum on a particle performing simple harmonic motion?

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.