Asled and rider with a combined weight of 62.8 kg are at rest on the top of a hill 13.8m high. assuming there is no friction, what would the total energy be on sliding halfway down the hill?

8490 J

Explanation:

Potential energy at the top of the hill:

PE = mgh

PE = (62.8 kg) (9.8 m/s²) (13.8 m)

PE = 8490 J

Since no work is done by friction, the total energy at any point on the hill is 8490 J.

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.

the answer would be 32*f