Need for exams asap the gravitational potential energy of an object is always measured relative to the a)location where the object's kinetic energy is zero. b)reference level from which the height is measured. c)surface of earth. d)position of maximum mechanical energy.

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

What was the first instrument to ever record an earthquake?

How to calculate voltage drop in a series circuit