Robin uses a pulley system to lift a bag of food into the trees on a camping trip. The food has a mass of 40 N and must be at least 2 m off the ground to be out of a bear’s reach. If she uses a single pulley, calculate how much work, in J (remember 1 N*m = 1 J), Robin will have to do.

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

In a series circuit the __ is the same at every point