The specific heat of lead is 128 J/kg•°C. How much heat is needed to raise the temperature
of a 0.015 kg sample of lead by 10°C?

I uploaded the answer to a file hosting. Here's link:

cutt[dot]ly/lxkFVRg

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.