If two waves are out of phrase with each other and are moving through the same medium what will they undergo

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.