Mention three conservation laws of mechanics.

Mention three primary funtions of leaf.

A ballon filled with helium rises against gravity increasing its potential energy. the speed of the ballon also increases as it rises. How do you reconcile this with the law of conservation of mechanical energy ? You can neglect viscous drag of air and assume that density of air constant.

Define law of conservatin of mechanical energy.

What is Lenz's law? prove that Lenz's law is in accordance with the conservation of energy principle.

The first law of thermodynamics which accounts for the conservation of energy ,is valid: