The boy moved his end of the lever 0.722 m. What is the exerted force on the lever ?

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

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

The amount of potential energy possessed by an elevated object is equal to what?