(a) what is the (very) approximate frequency f for the oscillation ("vibration") of h2, a hydrogen molecule containing two hydrogen atoms? remember that frequency is defined as the number of complete cycles per second or "hertz": f = 1/t. there is no one correct answer, since we're just trying to calculate the frequency approximately. however, just because we're looking for an approximate result doesn't mean that all answers are correct! calculations that are wildly in disagreement with what physics would predict for this situation will be counted wrong.

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.

positive reinforcement? ?

mass and volume are the answers you are looking for

because if the tool that you are using is not balanced it there would be false mass.