Abook is on the table. if the weight of the book is 25 newtons, what is the magnitude and direction of the normal force?
0
a.
2.5 newtons in the downward direction
ob.
2.5 newtons in the upward direction
0
c.
25 newtons in the upward direction
od
25 newtons in the downward direction
0
e.
25 newtons perpendicular to the gravitational force

E.

Explanation: because the book is on the table, its not really moving in any direction.

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.

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