CHAPTER 11

1. (P.334 Prob.34) A particle moves from A to D in Figure P11.34 while experiencing force F = (6i + 8j) N. How much work does the force do if the particle follows path (a) ABD, (b) ACD, and (c) AD? Is this a conservative force? Explain.
   
2. (P.335 Prob.42) Sam, whose mass is 75 kg, strap on his skis and starts down a 50-m-high, 20° frictionless slope. A strong headwind exerts a horizontal force of 200 N on his as he skies. Find Sam's  speed at the bottom (a) using work and energy, (b) using Newton's laws.
3. (P.335 Prob.48) Use work and energy to find the speed of the 2.0-kg block just before it hits the floor if (a) the table is frictionless and if (b) the coefficient of kinetic friction of the 3.0-kg block is 0.15.
   
4. (P.336 Prob.60) A gardener pushes a 12-kg lawnmower whose handle is tilted up 37° above horizontal. The lawnmower's coefficient of rolling friction is 0.15. How  much power does the gardener have to supply at a constant speed of 1.2 m/s?
5. (P.337 Prob.73) Challenge Problem. The spring in Figure CP11.73 has a spring constant of 1000 N/m. It is compressed 15 cm, then launches a 200 g block. The horizontal surface is frictionless, but the block's coefficient of kinetic on the incline is 0.20. What distance d does the block sail through the air?