Avery low dense concentration of energy, in which the waves are quite spread apart is a characteristic sign of an area of of a wave.

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?