500 newtons is exerted to lift a box up on top of a shelf. If the box had a weight of 400 newtons, what is the efficiency?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

How does an observation about an object differ from an inference about that object