4. The internal-resistance of a battery, in the circuit diagram shown in the figure is 2 Omega and a battery has an emf of magnitude 18v. a. Find the reading of the ammeter and voltmeter in the circuit provided that switch S is closed.
b. Find the reading of the voltmeter when switch S is open.

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?