What is the efficiency of a ramp if you do 400 J of work to push a 60 N box up the ramp until it is 3.0 m above the ground?

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing

See the attachment and solve question 5th

The receptor cells that convert light energy into neural signals are called