Por que, em geral, o reservatório de água aquecida é revestido com um material mau condutor de calor?

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Could someone me find the answer to this problem.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =