As temperature increases, the possible total humidity

An engine is designed to obtain energy from the temperature gradient of the ocean. what is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°f (15°c) and the temperature well below the surface is 41°f (5°c)

In a double slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 150 cm. what is the phase difference (in degrees) between the waves from the two slits arriving at a point p when the angular distance of p is 10° relative to the central peak, and the wavelength is 500 nm? (convert your result so the angle is between 0 and 360°.)

Charges of +3 pc and 5 c are 2 mm from each other. the-5 uc charge is replaced with a +5 c charge how will the electrical force between the charges compare with the original force? o same force, but in the opposite direction o same force, but in the same direction o greater force, but in the opposite direction o greater force, but in the same direction