A3.0 kg rock is moving at a constand speed in a 0.75 m radius horizontal circle every 2.0 seconds. calculate the centripetal force acting on the rock

22.3 N

Explanation:

The centripetal force acting on a the rock is given by:

where

m = 3.0 kg is the mass of the rock

v is the speed of the rock

r = 0.75 m is the radius of the trajectory

We need to find the speed of the rock. We know that the rock makes a complete circle in t = 2.0 s, and the radius of the circle is r = 0.75, so the speed is equal to the ratio between the distance covered (the perimeter of the circle) and the time taken:

And so, the centripetal force is

answer: what are you talking about?

explanation:

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.