When a skier skis down a hill, the normal force exerted on the skier by the hill is When a skier skis down a hill, the normal force exerted on the skier by the hill is less than the weight of the skier. greater than the weight of the skier. equal to the weight of the skier.

i would think it's food chain

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.

multiply 2kg by latent heat of vap

the answer is b, have negligible mass