How did Einstein‘s in newtons theory differ in terms of explaining the causes of gravity?

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

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

Smallest intensity of a stimulus that you can detect 50 percent of the time is