Ahole is punched at a in a plastic sheet by applying a 660-n force p to end d of lever cd, which is rigidly attached to the solid cylindrical shaft bc. design specifications require that the displacement of d should not exceed 15 mm from the time the punch first touches the plastic sheet to the time it actually penetrates it. determine the required diameter of shaft bc if the shaft is made of a steel with g.

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.

connect the batteries in series and hope

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