A 3,000kg roller coaster is going upside down at the top of a loop. The coaster is traveling at 24m/s around the loop with a radius of 15m. a) What is the force of the tracks on the roller coaster at the top of the loop?
b) What is the force of the tracks on the roller coaster at the bottom of the loop?

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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.

the answer is b, have negligible mass

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.