8. A 165 N sled is pulled up a 30° slope at a constant speed by a force of 145 N

Question

8. A 165 N sled is pulled up a 30° slope at a constant speed by a force of 145 N. What is the coefficient of kinetic friction between sled and slope? A) 0.1485 N B) 0.6699 N C) 0.341N D) 0.4374N E) 023925N moving at a speed of 146 m/s passes through a plank of wood at 131 m/s. Another bullet moving at 85 m/s passes through the same plank at what speed? A) 80.3292 m's B) 55.41 m/s C) 47.158 m/s D) 22.5 m/s E) 31.025 m/s 20. A hill is 100 m long and makes an angle of 12° with the horizontalAs S0kgjogger runs up the hill, how much work Dy sero E) 10,00 3 does gravity do on the jogger? -10,00 o B) 1200 C) 4,000 J Page 2

Explanation / Answer

solving first question of the page

18

if speed is constant ,it means net force in zero

so force applied=friction force+mgsin(30)

145=u*165*cos(30)+165*sin(30)

we got

u=0.4374

so option (D) is correct

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