On a typical clear day, the atmospheric electric field points downward and has a magnitude of approximately 119 N/C. Compare the gravitational and electric forces on a small dust particle of mass 3.3 ✕ 10−15 g that carries a single electron charge.

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

When an object is heated it contracts. a. true b. false