Which is an example of a chemical reaction?

a: paper folded into tiny pieces
b: paper burned and turned into smoke
c: paper soaked in water
d: paper shredded and turned into pulp

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)