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- (a) What is the minimum force of friction required to hold the system of Figure P4.74 in equilibrium? (b) What coefficient of static friction between the 100.-N block and the table ensures equilibrium? (c) If the coefficient of kinetic friction between the 100.-N block and the table is 0.250, what hanging weight should replace the 50.0-N weight to allow the system to move at a constant speed once it is set in motion? Figure P4.74A filled treasure chest (m = 375 kg) with a long rope tied around its center lies in the middle of a room. Dirk wishes to drag the chest, but there is friction between the chest and the floor with s = 0.52. If the angle between the rope and the floor is 30.0, what is the magnitude of the tension required to just get the chest moving?A box of mass m rests on a rough, horizontal surface with a coefficient of static friction s. If a force Fp is applied to the box at an angle as shown, what is the minimum value of for which the box will not move regardless of the magnitude of Fp?
- I have a shelf full of textbookd.Each book has a mass of 1.0 kg and mus=0.3. a. How hard do I need to push horizontally to unstick the top book from the rest of the pile? b. How many books can I unstick from the top of the pile if I push with a force of 16N?QUESTION 5 A 250 kg man climbe a 10 m, 40 kg ladder successfully to its top. The ladder is not at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of statio friction between the ladder and the floor that would allow him NOT to slip? O0.50 Ob.0.55 Oc.0.60 Od.0.65 O0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right ond of the 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? Oa 8762 N Ob. 10540 N OC. 12793 N od 13647 N Oe. 15246 NA 2.00-kg block is at rest on a horizontal plank that is 1.50 m long. When one end of the plane is raised to 0.50 m, the block starts sliding down. What is the coefficient of static/starting friction between the block and the plank? O 0.43 O 0.35 0.33 O 0.53
- A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle 0 below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to: O W + P cos 0. O W + P sin 0. OW-P sin 0. O W + P. O W. W 0 PA block with a mass of M = 10 kg is sat on a 45° slanted surface. What is the minimal force F required to avoid slippage if the coefficient of static friction between the block and the surface is s = 0.5? What is the maximum force F that can be applied to the block without it slipping? F MSituation 2. A 500 N block is resting on an inclined plane. See figure below. coefficient of static friction, Hs 0.3, coefficient of kinetic friction, Hx = 0.2 P. s = 0.3 fn = 0.2 0=30° 7. Find the value P that will still make the block in equilibrium condition. а. 382 N b. 71 N с. 110 N d. 279 N
- QUESTION 5 A 260 kg man climbs a 10 m, 40 kg ladder successfully to its top. The ladder in net at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of static friction between the ladder and the floor that would allow him NOT to slip? O a. 0.50 Ob. 0.55 Oc.0.60 Od.0.05 O.0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right end of thee 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? O a. 8762 N O b. 10540 N O c. 12793 N Od. 13647 N Oe. 15246 N2. A 16.5-lb block B rests as shown on a 33-lb bracket A. The coefficients of friction are µs = block B and bracket A, and there is no friction in the pulley or between the bracket and the horizontal surface 0.35 and u = 0.28 between a. Determine the maximum weight of block C if block B not slide on bracket A. b. If the weight of block C is 10 percent larger than the answer found in a, determine the accelerates of A, B and C. A B 4/ 4 ...1. Imagine 4 objects made of the same material but with different masses. All systems have the same coefficient of static friction μs. Rank in order from smallest to largest: the minimum applied force required to make the objects move if their masses are: Object 1 = m/2 Object 2 = m Object 3 = 2m Object 4 = 4m 2. Now imagine three objects with the same coefficient of kinetic friction but each having a different mass. We’re going to push each object with a known force F. Rank the velocity of the objects, from smallest to greatest, after we apply the force F for 4 seconds.