4. A horse is towing a barge along a canal with a rope that makes an angle of 25° with the canal. The horse exerts a force of 500 lb on the rope. How much force is exerted on the barge in the direction of its motion?
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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 P4.74(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 P4.74All object of mass m = 500 kg is suspended from the ceiling of an accelerating truck as shown in Figure P6.21. Taking a = 3.00 m/s2, find (a) the angle 0 that the string makes with the vertical and (b) the tension T in the string.
- A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.2. A 2 kg box is suspended in the air. Attached to each corner of the box is a rope. All 4 ropes are the same length and are attached to 1 point in the ceiling. Draw the FBD of the box and find all the forces acting on it. 3 A 1 5 00-kg car starts from rest and takes 10s to reach a sneed ofThree men pull on ropes attached to the top of a heavy object which is level with the ground Man A is 6 ft. tall, stands 6 ft. away, 45 degrees NE from the center of the object and exerts a force of 12 lbs Man B is 5 ft 6 in tall 6 ft away, 60 degrees NW and pulls with a force of 60 His Man C is 5 ft fall, also stands 6 ft away, 30 degrees SE and pulls with a force of 80 lbs Assuming the topes are attached to their shoulders which are 2/3 of their height from the ground, what is the magnitude of the horizontal resultant (in lbs) of these forces on the object?
- Problem 56. Your car is stuck in a mud hole. You are alone but have a long, strong rope. Having studied physics you tie the rope tautly to a telephone pole and pull on it sideways as in the figure below. A) Find the forces exerted by the rope on the car when 0 = 3° and you are pulling with a force of 400 N and the car does not budge. B) How strong must the rope be if it takes a force F of 600 N to move the car when 0 = 4°. Pole CarTwo EMTS are carrying a person on a stretcher. The weight of the person and the stretcher is 600 N. 1. If both of them carry the stretcher at the same angle, 60° above the horizontal. Each of them exerts (less, same, more) amount of force as the other paramedic. (1) 2. Draw an FBD. (4) 3. Find the y- components exerted forces by the paramedics. (4) 4. Find the x- components exerted forces by the paramedics. (2) 5. Find the forces exerted by the EMTS. (3) 6. If the paramedics did not carry the stretcher at the same angle, the person carries it at a (larger/smaller) angle, compares to the horizontal, would exert more force. Explain your answer. (1)61. Consider the 52.0-kg mountain climber shown below. (a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary. Assume that the force is exerted parallel to her legs. Also, assume negligible force exerted by her arms. (b) What is the minimum coefficient of friction between her shoes and the cliff? 31° legs 15°
- A.) Two forces act an angle of 120 ° . The bigger force is 40 N and the resultant is perpendicular to the smaller . Find the smaller force.76. A rescue helicopter is lifting a man (weight = 822 N) from a cap- sized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acccleration of 1.10 m/s²? (b) What is the tension during the remainder of the rescue when he is pulled upward at a constant velocity?21. A canal barge is being pulled along a canal by two horses, one on either side of the canal. One of the horses is pulling with a force of 2800 N 30° to the right of the canal's direction. The total force from the two horses must have the direction of the canal. a) Calculate the force exerted by the second horse if it is pulling 20° to the left of the canal's direction. b) Calculate the direction that the second horse should be pulling if it exerts a force of 3200 N. 25