1 of 1 Q - 2 | Page view A" Read aloud T Add text Draw Highlight Erase B m A 3. [1pt ] *35 At the zoo, two monkeys weighing 70.0 N each are playing on a rope-and-pulley system. If the lower rope is attached to a weight of mass m = 14.0 kg, what is the tension in the lower rope at point A, assuming the system is in equilibrium? Answer: Submit All Answers Last Answer: 274.6N Incorrect, tries 1/15. 4. [1pt] * *53 What is the tension in the upper rope at point B Answer: Submit All Answers1 of 1 Q - 2 Page view A" Read aloud T Add text Draw Highlight Erase 5. [1pt] * *# Give the correct tension, T, in the marked rope for each situation. The rope is held so the system is stationary. All ropes and pulleys are massless and frictionless. A) T = W B) T = W/2 C) T = W/3 D) . T = 2W E) T = 3W/2 F) T = 2W/3 G) T = W/7 H) T = W/5 1) T = 2W/7 J) T = 2W/5. (E.g., if the first is B and the rest are A, answer BAAA.) 30 30 1) W W 309 3) 60 W W W Answer: Submit All Answers Moving Pulleys 6. [1pt] *2383 Which of the following statements are true? Select all correct. If none correct, enter N. A. If two objects are connected with ropes and pulleys, their accelerations must have the same magnitude. B. If a rope passes around several pulleys, it has the same tension at every point. C. The total length of an un-stretchable rope may change if it's attached to moving objects. D. If an object is hanging from a vertical rope, it can accelerate up, down, or not at all. Answer: Submit All AnswersAnswer: Submit All Answers 7. [1pt] * 7 A frictionless pulley with zero mass is attached to the ceiling. Mass .M, - 0.227 kg is being accelerated downward with 1.24 m's?. Calculate the mass m, 1 2 Submit All Answers 8. [1pt] # 72 Am You only have 8 tries. Draw free body diagrams! Answer True, False, or Cannot tell to each of the four statements below. E.g, if the answer to the first statement is "true' and to the rest, "cannot tell', enter TCCC. Be careful about the signs of the acceleration (x is posithe to the right, y is positive up)! 2 b. Block 1 rests on a frictionless table. In case A, a 10 N weight is attached; in case B, a 10 N force is applied to the rope. The ter n the block is released. 1 1 77 ION 10 N Tension B diagram below, then joy) = 8- 1 2 The diagram below shows two blocks, I and 2, at rest, connected to a rope and pulley system. There is friction between the blocks, but block 2 rests on a frictionless surface. An external force F.., is applied; the tension in the rope is I and the frictional force is F. (Draw free body diagrams!) If the blocks move, then 27-F. 1 2 Answer Submit All Answers9. [1pt] * #4 . Jf, and .M, are two masses connected as shown. The pulley and the incline are f M, (3.00 kg) accelerates downwards at 291 m's', and that @ - 27.0'. Answer: Submit All Answers 10. [1pt] # #ty Two masses M, = 8.31 kg and .M, = 8.33 kg are connected with a massless string over two massless pulleys, with one end of the string attached to a solid table. The pulleys and surfaces are frictionless. What is the magnitude of the acceleration of mass M? answer Submit Al Answers 11. [1pt] * # t A block of mass m, is attached to a block of mass m, by a ss. When the blocks are let aswer to the first question is A, to the second, C, and to the third, D, enter ACD. You only have 6 tries! A) a, = 20/m, 8 B) a, - 8-20m. D) a, - Dim,-g E) , = Im, G) a, = Tim,+gm, (2m) H) a,, = 126, L) a, - Tim,+gmi'm, Na= Im 0) , = 207m, P) a, = 27im,+gm_m, R) a - -20 s) a = 201m;-8 1) a, - 21im, +gm/my V) a, = 2Tim, X) a, = -20% Note that in these expressions, g is the magnitude of the acceleration due to gravity. 1) Select the correct expression for the relationship between the accelerations of blocks 1 and 2. in) Select the correct expression that describes how the magnitude of the acceleration of block 1, a,, depends on the tension in the rope, I. il) Select the correct expression that describes how the magnitude of the acceleration of block 2, a,, depends on the tension in the rope, I. Answer Submit Al Answers 12. [1pt] # # tz If m, " 2.20 kg and my = 1.80 kg. find the magnitude of the acceleration of block 1, a,, once the blocks are released. Answer: Submit Al Answers13. [p(] * 7 Which of the following statements are true? Select all correct. If none correct, enter N. e center of mass of an object is the geometric average location of all the component pieces. B. If you throw a stick in the air, the center of mass will follow projectile motion. C. If there are two objects in a system, the center of mass of the system is exactly halfway between the two objects. D. To find the center of mass of a 2D object, the x-position will ex-position will depend on the y-position E. If there are no external forces, the center of mass will never move. Answer: Submit All Answers Calculate the centre of mass of the object shown below, assuming uniform density. 14. [1pt] * #t Assume the origin, O, at the lower left, and the positive x-axis pointing to the right. What is the x coordinate of the centre of mass, in terms of a? Answer: Submit All Answers 15. [1pt] # #17 If the positive y-axis points up along the page, what is the y coordinate of the centre of mass, in terms of a? Answer: Submit Al Answers Ay 16. [1pt] #titz A thin rectangular plate of uniform density o = 2.73 kg'm has a length a - 35.8 cm and a width b - 26.5 cm. The lower left comer in the plate with centre at (1 1.90 em, 11.25 cm) and radius r = 7.30 cm. Calculate the mass of the object. Answer: Submit All Answers b 17. [1pt] # trz Calculate the x coordinate of the object's centre of mass. Answer Submit All Answers 18. [1pt] #717 Calculate the distance of the centre of mass from the origin. Answer: Submit All Answers 19. [ 1pt] * * * A 540 kg cannon and a supply of 71 cannon balls, each with a mass of 20.4 kg, are inside a sealed railroad car with a mass of 44000 kg and a length of 48 m. The car e been fired, what is the greatest distance the car can have moved from its original position? Answer: Submit All Answers 20. [1 nt] #r1 of 1 Q - + 2 | Page view A Read aloud T Add text Draw Highlight Erase | | 6 9 To exit full screen, swipe down from top of screen or press | F11 A 540 kg cannon and a supply of 71 cannon balls, each with a mass of 20.4 kg. are inside a sealed railroad car with a mass of 44000 kg and a length of 48 m. The cannon fires to the right; the car recoils to the left. The cannon balls remain in the car after hitting the wall. After all the cannon balls have been fired. what is the greatest distance the car can have moved from its original position? Answer: Submit All Answers OWO 20. [1pt ] * What is the speed of the car after all the cannon balls have come to rest on the right side? Answer: Submit All Answers 21. [1pt] * * * A dog, with a mass of 11.0 kg, is standing on a flatboat so that he is 24.0 m from the shore. He walks 7.3 m on the boat toward the shore and then stops. The boat has a mass of 45.0 kg. Assuming there is no friction between the boat and the water, how far is the dog from the shore now? x (m) Answer: Submit All Answers