4. The coefficent of friction between the two surfaces depends on
(a) Nature of the surface in contact
(b) Mass of the two bodies in contact
(c) Applied force
(d) Normal contact force between the surface
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A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle.
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⁰thoda aasan pucho yrrrrrr
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