Acar travels on a straight, level road. (a) starting from rest, the car is going 38 ft/s (26 mi/h) at the end of 4.0 s. what is the car's average acceleration in ft/s2? (b) in 3.0 more seconds, the car is going 76 ft/s (52 mi/h). what is the car's average acceleration for this time period?

What is the frequency of a light wave with a wavelength of 620nm

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?