Why do some of the staples stick to the nail?

Explanation:

When the bar magnet picks up a nail, it magnetizes the nail. The domains of the nails temporarily align in one direction and it acts like a magnet. The nail becomes a temporary magnet. Therefore, when the tip of the nail touches some staples, the staples get attracted by the nail and sticks to it.

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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.