Conclusion for ohm law

Whats the usefulness or inconvenience of frictional force by turning a door knob?

4025.05m + 20.0m + 0.050004m

A 206.3 kg walrus initially at rest on a horizontal floor requires a 249 N horizontal force to set it in motion. Find the coefficient of static friction between the walrus and the floor. Use 10 m/s2 for g.

Which objects can be electrically polarized? a. negatively charged object b. positively charged objects c. neutral objects d. both positive and negatively charge object

0.5 kg air hockey puck is initially at rest. What will it's kinetic energy be after a net force of. 8 N acts on it for a distance of 2 m

Two iron rods are placed horizontally, touching end-to-end. One end of one rod is heated. After some time, the other rod also feels warm to touch.

Which part of the motor is responsible for reversing the flow of current?

In a generator, as the magnet spins, opposite poles of the magnet push the electrons in opposite directions. This back-and-forth movement of electrons is called what? A) revolutions per minute B) direct current C) alternating current.

A train travels at a speed of 30 miles/hour and traveled a distance of 240 miles. How long did it take the train to complete its journey?

What is the mass number of a potassium atom that has 20 neutrons