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* A person is pushing two carts that are connected with a metal bar so that the carts are moving at constant acceleration
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- A 1 000-kg car is pulling a 300-kg trailer. Together, the car and trailer move forward with an acceleration of 2.15 m/s2. Ignore any force of air drag on the car and all frictional forces on the trailer. Determine (a) the net force on the car, (b) the net force on the trailer, (c) the force exerted by the trailer on the car, and (d) the resultant force exerted by the car on the road.arrow_forwardThree objects are connected on a table as shown in Figure P4.73. The coefficient of kinetic friction between the block of mass m2 and the table is 0.350. The objects have masses of m1 = 4.00 kg, m2 = 1.00 kg, and m3 = 2.00 kg as shown, and the pulleys are frictionless. (a) Draw a diagram of the forces on each object. (b) Determine the acceleration of each object, including its direction. (c) Determine the tensions in the two cords. (d) If the tabletop were smooth, would the tensions increase, decrease, or remain the same? Explain. Figure P4.73arrow_forwardMeasuring coefficients of friction A coin is placed near one edge of a book lying on a table, and that edge of the book is lifted until the coin just slips down the incline as shown in Figure P4.82. The angle of the incline, C, called the critical angle, is measured. (a) Draw a free-body diagram for the coin when it is on the verge of slipping and identify all forces acting on it. Your free-body diagram should include a force of static friction acting up the incline. (b) Is the magnitude of the friction force equal to sn for angles less than C? Explain. What can you definitely say about the magnitude of the friction force for any angle c? (c) Show that the coefficient of static friction is given by s = tan c. (d) Once the coin starts to slide down the incline, the angle can be adjusted to a new value c c such that the coin moves down the incline with constant speed. How does observation enable you to obtain the coefficient of kinetic friction? Figure P4.82arrow_forward
- A man exerts a force of 16.7 N horizontally on a box so that it is at rest in contact with a wall as in Figure 6.3. The box weighs 6.52 N. a. Find the static friction force exerted on the box, given the forces being applied, b. If the coefficient of static friction between the wall and the box is 0.50, find the maximum static friction force that may be exerted on the box. Comment on your results.arrow_forwardA 1.00 103 car is pulling a 300.-kg trailer. Together, the car and trailer have an acceleration of 2.15 m/s2 in the positive x-direction. Neglecting frictional forces on the trailer, determine (a) the net force on the car, (b) the net force on the trailer, (c) the magnitude and direction of the force exerted by the trailer on the car, and (d) the resultant force exerted by the car on the road.arrow_forwardTwo boxes of fruit on a frictionless horizontal surface are connected by a light string as in Figure P4.85, where m1 = 10.0 kg and m2 = 20.0 kg. A force of 50.0 N is applied to the 20.0-kg box. (a) Determine the acceleration of each box and the tension in the string. (b) Repeat the problem for the case where the coefficient of kinetic friction between each box and the surface is 0.10. Figure P4.85arrow_forward
- Q5) Which of these is the action-reaction pair for the frictional force of the ground pulling back on the skier? A) The gravitational force of the skier pulling up on the Earth. B) The normal force of the earth pushing up the skier. C) The normal force of the skier pushing down on the earth. D) The frictional force of the skier pulling forward on the ground.arrow_forward1. Steve pushes a box across a level floor with a constant horizontal force. This causes the box to move at a constant speed, v. The force from Steve: a. has the same magnitude as the weight of the box. b. equals the sum of the box's weight and the total frictional forces opposing the box's motion. c. has the same magnitude as the frictional forces opposing the box's motion. d. has greater magnitude than the frictional forces opposing the box's motion. e. has greater magnitude than the weight of the box. 2. Steve now doubles the force he applies to th box from the previous problem. Which of the following is true? a. The box will move at double the previous speed. b. The box will move with a continuously increasing speed. c. The box will increase speed for a while, then move at a constant speed. d. The box will continue to move at the same speed for a while, then continually increase speed. e. The box will move at a greater constant speed, but not necessarily double the speed.arrow_forward(Background Info) A car has a mass of 1600 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 8000 N. Draw all diagrams by hand. (Question) Draw a picture and identify all the forces acting on the car while the brakes are applied before it stops. Draw a free body diagram (FBD) of the car during this time. Don’t forget to label your coordinate system. Additionally, if the car was initially moving at 20 m/s, what is the shortest distance in which the car can stop safely?arrow_forward
- A 0.35 kg block is being pulled across a flat, level surface by a horizontal string. When the tension in the string is 1.8 N, the block’s acceleration is 0.75 m/s2 in the same direction as the tension. What is the coefficient of kinetic friction between the block and the surface? For your physical representation, draw a free body diagram of the forces acting on the blockarrow_forwardPlease select TWO options as your correct answers. TWO correct answers will give you correct answer.WRONG answers If you choose ONE answer only or only ONE answer is correct. In a Tesco supermarket parking lot, an employee is pushing ten empty shopping carts, lined up in a straight line. The acceleration of the carts is 0.050ms ^ -2 . The ground is level, and cach cart has a mass of 2.6 kg. (i) What is the net force acting on any one of the carts? (ii) Assuming friction is negligible, what is the force exerted by the firth cart on the sixth cart? A. 0.13 N B. 0.65 N C. 1.25 N D. 1.30 N E. 6.50 Narrow_forwardA chain consists of identical links, each with a mass of 2.5 kg. You grab the top link and pull the chain so that it accelerates upwards at a constant rate of 2.5 m/s2. a) Draw a free body diagram of the bottom three links (labeled 1, 2, 3). Label all forces and use double subscript notation to denote which object exerts the force and which object is experiencing the force. b) Find the magnitude of the force exerted on link 1 by link 2, in Newtons. c) Find the magnitude of the force exerted on link 2 by link 3, in Newtons.arrow_forward
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