The two man bobsled has a maximum mass allowed is 390 kg. we'll use that. here is a stunning number: the coefficient of kinetic friction between the bobsled runner and the ice is .0073! since there are two runners, we will multiply that number by 2 and get .0146. calculate the normal force of the bobsled: fn

The normal force, is the reaction force that acts in the opposite direction to the weight, and that in a horizontal plane, is exactly this (following the principles of Newton's third law)

Therefore, from the mathematical definition of Weight we have that the normal Force is equivalent to

N = mg

Where,

m = mass

g = Gravitational acceleration

Our mass is 390Kg and acceleration, the product of gravity is equivalent to

Therefore the normal Force would be

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.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms