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

28. evolution

29. environment, survive, offspring  

explanation:

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.