Within an internal combustion engine, the can-shaped component that moves up and down the cylinder and is the main moving part in the engine is the
a. connecting rod. b. piston. c. spark plug. d. crankshaft.

A.Connecting rod.

Explanation:

Connecting rod is moved up and down inside the engine .The connecting rod is having can shaped structure while it's moving up and down in the internal combustion engine.

The connecting rod is the very important component of the any type of the engine.Generally is made from forging process because it required high mechanical as well as thermal stresses.

Therefore the answer will be  A.

A.Connecting rod.

the results is a decrease in air temperature with an increase of altitude.

explanation:

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.