Write an expression for the instantaneous voltage delivered by an ac generator supplying 120 v rms at 60 hz. assume the voltage is 0 at time =0, and leave the factors in exact form; do not round their values. write the argument of the sinusoidal function to have units of radians, but omit the units.

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Why are graphs useful when interpreting data

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.