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- A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?1. When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200N, directed 20° below the horizontal, the magnitude of the normal force of the floor on the crate is: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 lb
- Redo Example 5, assuming that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. For purposes of significant figures, use 2.91 kg for the mass of the plane, 12.2 m for the length of the guideline, and 18.2 and 36.4 m/s for the speeds. (a) Number (b) Number Units UnitsRedo Example 5, assuming that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. For purposes of significant figures, use 0.954 kg for the mass of the plane, 18.1m for the length of the guideline, and 18.8 and 37.6 m/s for the speeds. (a) Number (b) Number i eTextbook and Media Save for Later Units Units > Attempts: 0 of 5 used Submit Answer15-9. 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
- An 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is?15-102. 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 ftA drill rod is used with a air hammer for making holes in hard rock so explosives can be placed in them. How many impulsive forces act on the drill rod during the drilling? Assume the weight of the drill rod is nonimpulsive 2 1,
- . A 50 kg box lies on top of a 30° inclined plane, what is the force exerted by the plane on the box? (Complete solution)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.A suspended mass of 20 grams located at 210° in the force table is the same as:
