B2. A 2-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 1.5 m/s^2 down the incline. Determine the magnitude of the force of friction acting on the block.

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.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

f=ma newton's second law 7x8=56n