Motion

Categorize the motion as periodic or oscillatory motion (i) Motion of Halley 's comet around the sun (ii) Motion osf the penedulum of a wall clock (iii) Motion of liquid n a U-tube when liquid is once compresed in one limb and then left to itself Hint : In oscallatory motion, there is to and fro motion about some mean position.

Assertion: Circular and projectile motions both are two idimensional motion.But In circular motion, we cannot apply v=u+at directly, whereas in projectile motion we can. Reason: Projectile motion takes place under gravity, while in circular motion gravity has no role.

Heat is associated with a) kinetic energy of random motion of molecules b) kinetic energy of orderly motion of molecules c) total kinetic energy of random and orderly motion of molecules d) kinetic energy of random motion in some cases and kinetic energy orderly motion in other.