1. A skier starts from rest at the top of a 21° slope 1.0 km long.Neglecting fri
ID: 1738876 • Letter: 1
Question
1. A skier starts from rest at the top of a 21° slope 1.0 km long.Neglecting friction, how long does it take to reach the bottom?1 s
2. A hockey puck is given an initial speed of 12.2 m/s. If it comes to rest in 45 m, what is the coeficient of kinetic friction[between the puck and the ice]?
k = 1 3. A child sleds down a 18° slopeat constant speed. What is the coefficient of friction betweenslope and sled?
1
1. A skier starts from rest at the top of a 21° slope 1.0 km long.Neglecting friction, how long does it take to reach the bottom?
1 s
2. A hockey puck is given an initial speed of 12.2 m/s. If it comes to rest in 45 m, what is the coeficient of kinetic friction[between the puck and the ice]?
k = 1 3. A child sleds down a 18° slopeat constant speed. What is the coefficient of friction betweenslope and sled?
1
Explanation / Answer
1) mgSin=ma, so a=gSin and y=-1km Sin21= -.358 kmthen -.358x103m=-1/2(9.8Sin21)t2 and finallyt=7.139 s 2) F=ma and -f=mg, so -mg=ma or=-a/g=-(-Vo2/2d)/(9.8)=-(-(12.2)2/2(45))/(9.8)=.169 3) mgSin-N=m(0) or mgSin-mgCos=0 , so=Tan= .325
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