Aboy uses a force to keep a rock from falling. (he is carrying the rock.) some forces, like this one, act only when two objects are touching. which force usually acts between objects that are not touching?

a. friction
b. gravity
c. pulling
d. pushing

An aircraft performs a maneuver called an "aileron roll." during this maneuver, the plane turns like a screw as it maintains a straight flight path, which sets the wings in circular motion. if it takes it 35 s to complete the circle and the wingspan of the plane is 11 m, what is the acceleration of the wing tip

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?