How much energy is needed to heat up 1kg of water by 15 selcies

Why don't you see your reflection in water with waves or repples

What are the necessary conditions for fusion?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.