A conducting spherical shell of inner radius r1 and outer radius r2 has a charge Q on it. An additional charge, also Q, is then added to the sphere. What is the resulting charge per unit area on the outer surface of the sphere?

5) Old-style dimmers consisted of a variable resistor so you could dial in more resistance to lower the current and, hence, dim the light.

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water?

The capacitance of a parallel-plate capacitor is independent of which quantity?

type 2 diabetes runs in familes, but its frequency has been rising in recent years. what factors might explain this increase in type 2 diabetes?

A disk with a diameter of 0.05 m is spinning with a constant velocity about an axle perpendicular to the disk and running through its center.

A rock is thrown from a cliff and hits the ground five seconds later at a distance of 50 m from the cliff how high was a cliff

A 15.0 m long plane is inclined at 30.0 degrees. If the coefficient of friction is 0.426, what force is required to move a 40.0 kg mass from rest at the bottom on the plane to the top of the plane with a final velocity of 8.00 m/s?

In a pig-calling contest, a caller produces a sound with an intensity level of 60 db. how many such callers would be required to reach the pain level of 120 db? 2 incorrect: your answer is incorrect.

Why is the use of scientific names important in biology?

1) what is a calorie?