When a kettle is heating water, energy is transferred from the thermal energy stores of the kettle's heating element to the energy stores of the water. What one word completes the sentence?

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.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray

prndulum needs thread, weight clock to time swings