An owl hoots in the forest and the power density of the hoot is measured to be 2 x 10^13 at a certain point. What is the loudness of the sound in decibels at this same point?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

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.)