Aman attempts to pick up his suitcase of weight w_s by pulling straight up on the handle. (part a figure) however, he is unable to lift the suitcase from the floor. which statement about the magnitude of the normal force n acting on the suitcase is true during the time that the man pulls upward on the suitcase?
a. the magnitude of the normal force is equal to the magnitude of the weight of the suitcase.
b. the magnitude of the normal force is equal to the magnitude of the weight of the suitcase minus the magnitude of the force of the pull.
c. the magnitude of the normal force is equal to the sum of the magnitude of the force of
the pull and the magnitude of the suitcase's weight.
d. the magnitude of the normal force is greater than the magnitude of the weight of the suitcase

B. The magnitude of the normal force is equal to the magnitude of the weight of the suitcase minus the magnitude of the force of the pull.

Explanation:

As we know that man tried to pull the suitcase in upward direction

so here we can say that net upward force on the suitcase applied by the man is not as sufficient that it will counter balance the weight of the suitcase

So here the net force on the suitcase will be zero and the force equation is given as

so we have

so correct answer will be

B. The magnitude of the normal force is equal to the magnitude of the weight of the suitcase minus the magnitude of the force of the pull.

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.