The approximate length of an unsharpened number 2 pencil is

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.