Question

0 m/s. It the 7. Doug hits a hockey puck, giving it an initial veloctty of 6- kinetic triction between ice and puck is 0.05, how Ear will the puek siide betore stopping? . a. 19 b. 25 С. 37 d. 57 m 8. A boxcar of mass 200 tons at rest becomes uncoupled on a 10° grade. If the track is considered to be frictionless, what velocity does the boxcar have after 10 seconds? a. 0.37 m/s b. 0.59 m/s c. 1.3 m/s d. 4.3 m/s 9. There are six books in a stack, each with a weight of 5 N. The coefficient of friction between all the books is 0.2. With what horizontal force must I push to start sliding the top five books off the bottom one? a. 1.0 N b. 5.0 N c. 3.0 N d. 7.0 N 10. A 70-kg man jumps 1 m down onto a concrete valkway. Bis dowmward motion stops in 0.02 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones? a. 15,490 N b. 7,010 N C. 4,900 N d. 3,500 N 11. A 5000 N weight is held suspended in equilibriun by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, Ti- Cable 2 applies a force upward and to the lest at an angle of 37 to the negative x-axis and has a tension, T2 What is the tension, 1 a. 4000 N b. 6640 N c. 8310 N d. 3340 N 12. A 150 N sled is pulled up a 28" slope at a constant speed by a force oe 100 x. what is the coefficient of kinetic friction between sled and slope? a. 0.53 b. 0.22 С. 0.13 d. 0.33 3. A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30° above the horizontal and the tension in the rope is 100 N. What is the normal force of the floor on the box? a. 300 N b. 86 N c. 50 N d. 250 N

Answer 1

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