If a certain car, going with speed v1, rounds a level curve with a radius R1, it is just on the verge of skidding. If its speed is now doubled, the radius of the tightest curve on the same road that it can round without skidding is:A) 2R1B) 4R1C) R1/2D) R1/4E) R1

Explanation:

Let's use the centripetal force definition.

So the first force will be:

(1)

Here:

Now, the final speed is double of the first one, so V2 = 2V1, Therefore the force will be:

(2)

If we match both equation (1) and (2), we will find R2.

Finally,

I hope it helps you!

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.