Consider a wire that has resistance r, length l and the cross-sectional area

a. the correct expression for the resistivity of that wire is:

6. how do the number of electrons flowing into a light bulb compare to the number of electrons flowing out of it?

A car has a momentum of 20,000 kg. m/s. What would the car's momentum be if its velocity doubles? 10,000 kg. m/s 20,000 kg. mis 40,000 kg • m/s 80,000 kg. m/s

A bar magnet is divided in two pieces. Which of the following statements is true? A) The bar magnet is demagnetized. B) The magnetic field of each separated piece becomes stronger. C) The magnetic poles are separated.

Two horses begin at rest. After a few seconds, horse A is traveling with a velocity of 10m/s west, while horse B is traveling with a velocity of 13m/s west. Which horse had greater acceleration? A.

Explain the plate tectonic theory.

At room temperature what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm that is needed to cause a 2.75 a current to flow?

A conductor has a net charge of + 24 uC. How many electrons are needed to make this conductor neutral

What does Force Means

Yosemite Sam was sailing his ship at a speed of 67 m/s when suddenly a storm accelerated his boat at a rate of 5.4 m/s^2 over a time period of 55s. What was Sam's final velocity? What formula must be used?

When will the earths core overheat and explode from the pressure buildup?