Four identical metallic objects carry the following charges: +1.51, +6.28, -4.69, and -9.07c. the objects are brought simultaneously into contact, so that each touches the others. then they are separated. (a) what is the final charge on each object? (b) how many electrons (or protons) make up the final charge on each object?

(a) - 1.4925 C

(b) 9.328 x 10^18

Explanation:

q1 = + 1.51 C

q2 = + 6.28 C

q3 = - 4.69 C

q4 = - 9.07 C

(a) As they touch each other, the conduction takes place.

Q = q1 + q2 + q3 + q4 = + 1.51 + 6.28 - 4.69 - 9.07 = - 5.97 C

There are four objects, so the charges are distributed equally.

Q = q / 4 = - 5.97 / 4 = - 1.4925 C

(b) As the negative charge is there so it has some excess electron.

Let n be the number of electrons

n = total charge / charge of one electron

n = 1.4925 / (1.6 x 10^-19) = 9.328 x 10^18

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.