Gary is trying to think of an object that could model a sunspot. His teacher tells him that such an object might be found right on his face. Which of the following most closely models the behavior of a sunspot? A. a birthmark
B. a freckle
C. an eyelash
D. a lip

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

What is an electric motor? explain its operation. 2-3 sentence

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.