A 65 kg woman is horizontal in a push-up position. What are the vertical forces acting on her hands? A) 410.4 N B) 433.3 N C) 217.3 N D) 410.4 N Centre of Mass 0.50m- -1.00m-
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- The driver of a car of mass 1.00 tonne is travelling on a mobrway at 126 km/h (nearly 80.0 mph), they slam the brakes on b avaid hitting a second vehicle in front of them, which had come to rest because of congestion ahead. After the brakes are applied, a cons tant friction force of 8.00x10' N acts on the car. Ignoring air resistance I) at what minimum distance should the brakes be applied to avoid a collision with the other vehicle? (Hint relate the change in kinetic energy to the work done) (a) 153 m (b) 2.19 m (c) 76.6 m (d) 6 12 m II) If the distance between the vehicles is initially only 30.0 mat what speed would the collision occur? (Hint relate the change in kinetic energy to the work done) (a) 18.8 ms" (b) 27.3 m s (c) 98.3 m s (d) 17.5 m s"1. When jumping off one foot, a 70 kg long jumper generates a vertical reaction force of 2200 newtons. If the coefficient of friction between the shoe and the track is 0.26 what is the netforce acting on the jumper (sum of all external forces)?two objects are at rest on a frictionless surface. Object ‘a’ has a greater mass than object ‘2’. When a force is applied to object ‘1’, it accelerates through a distance ‘d’. the force is removed from object ‘1’ and is applied to object ‘2’. At the moment when object ‘2’ has accelerated through the same distance ‘d’. K1 and K2 are K. E. acquired by ‘1’ and ‘2’ then : Group of answer choices a)K1 = K2 b)K1 < K2 c)K1 > K2 d)none
- m A person is pushing a wooden crate of mass mo = 20 kg at a constant speed vo = 1.2– for Ax = 3 m along a rough horizontal floor that has a coefficient of friction µk = .4./--/ A mass is suspended as shown in the diagram, with M = 18 kg and 0₂ = 28. Find the three tensions. 0₂ T₁ 15. T₁ A. 331.8 N 337.1 N ن کو ہے B. C. 293_N 1-1 16. T₂ A. B. C. /--/ 469.9 N 375.7 N 276.9 N T₂ T₁ M D. 73.3 N E. 504.1 N F. 515.3 N D. 346.4 N E. 297.5 N F. 304.8 NA 100-kg ice hockey player collides head-on with a 70-kg player. If the first player exerts a force of 500 N on the second player, how much force is exerted by the second player on the first? 100 kg 70 kg - 500 N - 1000 N The coefficient of static friction between a sled and the snow is 0.3, with a coefficient of kinetic friction of 0.2. A 500 N female sits on the 100 N sled. How much force directed parallel to the horizontal surface is required to start the sled in motion? 90 N 180 N 270 N 360 N
- 9 4a8-26. The refrigerator has a weight of 180 lb and rests on a tile floor for which us horizontally on the refrigerator in the direction shown. determine the smallest magnitude of horizontal force needed to move it. Also, if the man has a weight of 150 lb. determine the smallest coefficient of friction between his. shoes and the floor so that he does not slip 0.25. I| the man pushes Claca comm deces com1) Suppose that in-between the two carts is placed a spring balance. One end of the spring balance is tied to the Red cart, and the other to the Blue cart. The Red cart is held fixed, and the Blue cart is pulled with a force F newtons. What will be the force (i.e. weight) shown by the spring balance? 2) Suppose that in-between the two carts is placed a spring balance. One end of the spring balance is tied to the Red cart, and the other to the Blue cart. The Red cart is pulled to the left, and the Blue cart is pulled to the right. The two forces are equal, so that the carts do not move. If the force applied on the Blue cart is F newtons, what will be the force (i.e. weight) shown by the spring balance? 3) Suppose that in the third law experiment, you attach the magnetic bumpers on both carts and place them on the track so that the two carts repel each other. Also suppose that the red cart's magnets are twice as strong as the blue cart's. Then as you hold one cart at fixed position, and…
- 6-15.An anchor block is acted upon by the forces shown in Figure P6–15. Determine the resultant force. 5 lb 9 lb 13 lb FIGURE P6-154. The two boxes are connected by a heavy uniform rope with a of 4.00 kg. An upward force of 200 N is applied as F = 200 N mass shown. (a) Draw three free-body diagrams: one for the 6.00-kg block, one for the 4.00-kg rope, and another one for the 5.00-kg 6.00 kg block. For each force, indicate what body exerts that force. (b) What is the acceleration of the system? (c) What is the tension at the top of the heavy rope? (d) What is the tension at the midpoint of the rope? 4.00 kg 5.00 kg12.) Two effectively massless pulleys are used to hold the two F masses at rest, as shown in the figure to the right. Rope segment C attaches the leftmost pulley to the ceiling, while rope segment E anchors the rightmost pulley to a sturdy ledge. Rope segment F is tied off on the ceiling. What is the tension in rope segment E? B D 80 kg A) 2940 N B) 1960 N C) 980 N D) 490 N E A E) ON 20 kg