How far apart (in mm) must two point charges of 70.0 nc (typical of static electricity) be to have a force of 1.30 n between them?

r=5.824 mm

Explanation:

Given

Charge

Force between them

Electrostatic Force is given by

where and are the charge on the Particles

r=distance between them

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.