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

d) physical means can be used to separate the components of air.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.