00:01
Hello, here we have to solve the following problem.
00:02
A skier starts from the rest.
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At the top of the hill, which is inclined at 9 .9 degree.
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And the hillside is 195 meters long.
00:23
The coefficient of kinetic friction is 0 .750.
00:32
And we have to calculate how far the skier goes along, the horizontal portion.
00:40
How does this know? let's do this.
00:42
Let's make a sketch.
00:45
Here we have to determine distance d.
00:49
First of all, let's make, let's assign the lengths of each part.
00:59
And now we have to show the, we have to illustrate the friction force on the slope.
01:23
Here the friction force on the slope is mu k m g cosine teta and on the flat surface friction force is simply mu k m g and so now let's look at the motion along the slope um actually here let's use the conservation of energy principle initial potential energy mgh which is mg l sine theta plus work of the friction force on the slope which is negative mc.
02:44
Mg l cosine theta minus milk m g d equals to zero...
