Ahand crank generator produces electricity when the handle is turned. the generator is hooked up to a light bulb. when the handle is turned, the light bulb lights up. which of these is the best explanation of what is occurring here? a) the work done on the handle is converted into electricity and used to light the bulb. b) turning the handle pushes electrons in a wire through the light bulb. c) the generator excites atoms which makes the atoms glow. d) kinetic energy is lost and heat is generated.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element

In the absence of friction, gravity, and all other external forces, what kind of speed will an object display if it travels from the bottom to the top of an inclined plane? a. constant speed b. increasing speed c. decreasing speed d. speed increases and then decreases e. speed decreases and then increases