Showing 431 to 440 of 784 Questions
  • Block A in Fig. 5.68 weighs 1.40 N, and block B weighs 4.20 N. The coefficient of kinetic friction between all surfaces is 0.30. Find the magnitude of the horizontal force F necessary to drag block B to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed, frictionless pulley.

  • Block a in Fig. 5.69 has a mass of 4.00 kg, and block B has mass 12.0 kg. The coefficient of kinetic friction between block B and the horizontal surface is 0.25. (a) What is the mass of block C if block B is moving to the right and speeding up wi1h an acceleration 2.00 m/s? (b) What is the tension in each cord when block B has this ac

  • Block A in Figure, has mass mA = 4.0 kg, and block B has mass mB = 2.0 kg. The coefficient of kinetic friction between block Band the horizontal plane is µk = 0.50. The inclined plane is frictionless and at angle θ = 30°. The pulley serves only to change the direction of the cord connecting the blocks. The cord has negligible mass. Fi

  • Block A with weight 3w, slides down an inclined plane S of slope angle 36.9° at a constant speed while plank B, with weight w, rests on top of A. The plank is attached by a cord to the wall (Fig. 5.75). (a) Draw a diagram of all the forces acting on block A. (b) If the coefficient of kinetic friction is the same between A and B and be

  • Block B, with mass 5.00 kg, rests on block A, with mass 8.00 kg, which in turn is on a horizontal tabletop (Fig. 5.72). There is no friction between block A and the tabletop, but the coefficient of static friction between block A and block B is 0.750. A light string attached to block A passes over a frictionless, mass less pulley, and blo

  • Blocks A, B, and C are placed as in Fig. 5.56 and connected by ropes of negligible mass. Both A and B weigh 25.0 N each, and the coefficient of kinetic friction between each block and the surface is 0.35. Block C descends with constant velocity. (a) Draw two separate free-body diagrams showing the forces acting on A and on B. (b) Find

  • Blocks of mass m and 2m are connected by a string (Figure). (a) If the forces are constant, find the tension in the connecting string. (b) If the forces vary with time as F1 = Ct and F2 = 2 Ct, where C is a constant and t is time, find the time t0 at which the tension in the string isT0.

  • Blowing off units throughout your physics course, your instructor will expect you to be careful with units in your calculations" Yet some students tend to neglect them and just trust that they always work out properly. Maybe this real world example will keep you from such a sloppy habit. On July 23, 1983, Air Canada Flight I43 was being r

  • Boxes are moved on a conveyor belt from where they are filled to the packing station 11.0m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance then decelerates for the final half of the trip. If the coefficient of static friction betwe

  • Brother Bernard is a very large dog with a taste for tobogganing. Ernie gives him a ride down Idiots' Hill---so named because it is a steep slope that levels out at the bottom for 10 m, and then drops into a river. When they reach the level ground at the bottom, their speed is 40 km/h, and Ernie, sitting in front, starts to dig in his hee

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