If the pressure of a sample of gas is doubled at constant temperature what happens to the volume of the gas

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.