A78−kg skier is sliding down a ski slope at a constant velocity. the slope makes an angle of 21° above the horizontal direction. (a) neglecting any air resistance, what is the force of kinetic friction acting on the skier? (b) what is the coefficient of kinetic friction between the skis and the snow?

274N 0.41

Explanation:

As he is sliding down in a constant speed then the force that accelerates him (weight) and the force that slows his down (friction) are equal.

then

friction=mass x gravity x sin(21)

Fr=78kg x 9.8m/s2 x sin(21)=274N

friction= coefficient of kinetic friction x normal force of from the slope

Fr= u x 78kg x 9.8m/s2 x cos(21)=274N

Fr= u x 78kg x 9.8m/s2 x cos(21)=274Nu=274/677=0.41

true is the correct answer

hope i

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation