13-5. A body slides down a plane inclined at 40° to the horizontal, with an acceleration of 2.3 m/s². Determine the coefficient of kinetic friction.
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13-5. A body slides down a plane inclined at 40° to the horizontal, with an acceleration of 2.3 m/s². Determine the coefficient of kinetic friction.
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- 13-6. A body takes twice as long to slide down a plane inclined at 30° to the horizontal as compared to the time required if the plane were frictionless. Determine the coefficient of kinetic friction.15-7. Crates A and B weigh 100 lb and 50 lb, respectively. If they start from rest, determine their speed when t = 5 s. Also, find the force exerted by crate A on crate B during the motion. The coefficient of kinetic friction between the crates and the ground is µ = 0.25. A P = 50 lb25 sSM www Block B in Fig. 6-31 weighs 711 N. The coefficient of static friction between block and Knot- table is 0.25; angle is 30°; assume that the cord between B and the B. knot is horizontal. Find the maxi- mum weight of block A for which the system will be stationary.
- Answer must be Correct. A 10 kg box is pulled along a horizontal surface by a force of 40 N applied at a 30 ̊ angle from the horizontal. Coefficient of kinetic friction is 0.30. Calculate the distance travelled in 10 sec.4-54. The spool has a mass of 200 kg and rests against the wall and on the floor. If the coefficient of static friction at B is (4)e = 0.3, the coefficient of kinetic friction is (He)B = 0.2, and the wall is smooth, determine the friction force developed at B when the vertical force applied to the cable is P= 80 N. 0.4 m 0.1 m15-102. The 800-lb roller-coaster car starts from rest on the track having the shape of a cylindrical helix. If the normal force of the tracks on the car has a transverse component of No = 68 lb, determine the transverse component of its Ne velocity in t = 4s. Also, what is the car's velocity when it descends 8 ft? Neglect the size of the car. r=8 ft Probs. 15-101/102 8 ft
- In Fig. 6-23, a sled is held on an inclined plane by a cord pulling directly up the plane. The sled is to be on the verge of moving up the plane. In Fig. 6- 28, the magnitude F required of the cord’s force on the sled is plotted versus a range of values for the coefficient of static friction ms between sled and plane: F1 = 2.0 N, F2 = 5.0 N, and m2 = 0.50. At what angle u is the plane inclined?4-61. The drum has a weight of 500 N and rests on the floor for which the coefficient of static friction is 4, = 0.5. If a = 0.9 m and b= 1.2 m, determine the smallest magnitude of the force P that will cause impending motion of the drum.15-9. The 200-kg crate rests on the ground for which the coefficients of static and kinetic friction are µ, = 0.5 and Hk =0.4, respectively. The winch delivers a horizontal towing force T to its cable at A which varies as shown in the graph. Determine the speed of the crate when 1= 4 s. Originally the tension in the cable is zero. Hint: First determine the force needed to begin moving the crate. T (N) 800 T = 400 2 -t (s) 4
- Suppose you have a 120-kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.88 In Fig. 6-59, block 1 of mass m = 2.0 kg and block 2 of mass m2 = 1.0 kg are connected by a string of negligible mass. Block 2 is pushed by force F of magnitude 20 N and angle 0= 35°.The coef- %3D %3D %3D ficient of kinetic friction between each block and the horizontal surface is 0.20. What is the tension in the string? Fig. 6-59 Problem 88.1) Two blocks of masses m, = 5kg and m, 2kg are connected by a rope. The coefficient of %3! static friction between m, and the surface is u, = 0.5, and the coefficient of kinetic friction %3D is = 0.4. Which of the the following statements is correct about the type and the magnitude of the friction force acting on m, ? (Let g =10m/s) %3D mi Select one: a. Static, 20 Newtons b. Kinetic, 20 Newtons c. Static, 50 Newtons d. Static, 25 Newtons e. Kinetic, 50 Newtons f. Static, 0 g. Kinetic, 0 h. Kinetic, 25 Newtons