When an inflated balloon is exposed to cold air,
a. the temperature inside the balloon rises.
b. the pressure inside the balloon rises.
c. the volume of the balloon decreases.
d. the volume of the balloon increases

The correct answer would be C. The volume of the balloon will decrease. As depicted in Charles’ Law which states that volume and temperature are directly proportional to each other, when the pressure of the gas is at a constant. When this theory is applied, the balloon will decrease in volume when it is exposed to cold air because the gas pressure inside the balloon remains the same. It is easier to remember this concept with the equation V/T = K where V is volume, T is Temperature and K is constant pressure.  

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy