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Answers
5 a.) at every point he changes his tangent.
b.) his displacement will be 2r or D
6.) Third law of motion states that is a body applies force on another body the other body will also apply same amount of force in opposite direction.
8a.) distance is scalar. displacement is vector.
b.) uniform motion is equal distance covered in equal interval of time.
non uniform motion is unequal distance covered in equal interval of time
9a.) The scattering of light by the dust particles in air is called tyndall effect.
b.)Colloids are a homogeneous non-crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.
c.) A suspension is a heterogeneous mixture of a finely distributed solid in a liquid.
10a.) this happens because of the the inertia of rest as we apply force on the tree and the leaves stay at their position and hence they fall .
b.) This is because of the third law of motion that States did every action has its equal and opposite reaction show the force of applied by water gives a resisting force by air by which fireman receives a back force.
c.) because he can apply force and will get a fiction force by the ground and hence will get an acceleration.
Explanation: