WQ5.9 1/1 point (graded) Two students are pulling horizontally with 100 N force on opposite ends of a rope. What is the tension in the rope? Three students discuss the situation: (b) Student 1: The tension must be zero, because they pull with equal magnitude, but in opposite diretion. 100 N T =? Rope 2 100 N Student 2: The tension must be 200 N because the two forces add to the total tension force. Student 3: I know that the tension must be 100N, but I can't explain it. With whom do you agree? Write your answer and then look at WQ5.10 below. I know that the tension must be 100N, but I can't explain it. V WQ5.10 4/4 points (graded) a) What is the tension force in the rope that is measured by the spring scales in each of the two cases? Use Newton's laws to determine the forces exerted on the two ends of each spring scale. Assume that the pulley wheels have no friction and that the systems are in static equilibrium (which means that nothing moves). Spring scale 5 kg 5 kg 5 kg a) Case 1 (left picture) What is the tension force in the rope? Cive your answer is units of Newtons [N]. 49 1 49 a) Case 2 (right picture) What is the tension force in the rope? Give your answer is units of Newtons [N]. 49 V 49 b) Are the tension forces in the two cases the same? Explain your answer. no c) What is your final answer to WQ5.9 above? V I know that the tension must be 100N, but I can't explain it. V
WQ5.11 2/2 points (graded) a) Robert pulls on the rope at an angle and lifts up a heavy box. With what force does he have to pull on the rope to move up the box at constant speed? Fric Sonkas pulley 1000 N C 1000 N cos 45° 1000 N 1000 N sin 45° other 1 b) Explain your answer: angle does not matter V