Unpolarized light of intensity 400 w/m2 is incident on two ideal polarizing sheets that are placed with their transmission axes perpendicular to each other. an additional polarizing sheet is then placed between the two, with its transmission axis oriented at 30∘ to that of the first.

300 W / m2

Explanation:

Applying Malus' law, the intensity after going through the second polarizer is:

S2 = S1 cos^2 (30) = 400 (0.86)^2 = 400 (0.75) = 300 W / m2.

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in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

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.