Will mark brainliest
dean needs to lift the rock shown in the picture above. he wants to use the lever to lift the rock while using the least amount of effort force. at which position should dean push on the lever?

a. position w b. position x c. position y d. position z

Anybody wanna ? (picture included? )

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity