Derive the formula 2as=v² -u² where the formula have have usual meanings

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

What are the north and south poles of a solenoid change with?

State the following: boyle's law and charle's law