A washing machine heats 10kg of water in each wash cycle. How much energy is saved by washing at 30'c instead of 50'c if the starting temperature of the cold water is 16'c? The specific heat capacity of water is 4200 J/Kg'c

, assuming that there's no heat exchange between the washing machine and the environment.

Explanation:

Let denote the mass of water and the specific heat capacity of water. The energy required to raise the temperature of that much water by would be:

.

Washing at would require a temperature change of .

Washing at would require a temperature change of .

In both situations, while .

Calculate the energy required in either situation:

Washing at :

.

Washing at :

.

.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

a sonic boom is a loud boom that breaks the sound barrier

explanation: