What did I do wrong in these PCS211 questions about Newton's Laws? Please take your time to correct the mistakes!

8. [3/4 Points] DETAILS PREVIOUS ANSWERS SERPSE10 5.4.OP.006.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two forces F , and F 2 act on a 8.00-kg object. F1 = 30.0 N and F, = 16.0 N. 90.0 60.0 m m a b (a) Find the acceleration of the object for the configuration of forces shown in Figure (a). magnitude 4.25 V m/s2 26.56 direction X Draw a careful picture representing the sum of the two forces (draw vectors, 'tip-to-tail') then check your trigonometry definitions. . (counterclockwise from F, ) (b) Find the acceleration of the object for the configuration of forces shown in Figure (b). magnitude 5.05 m/s2 direction 19.79 . (counterclockwise from F 1 )10. [3/5 Points] DETAILS PREVIOUS ANSWERS SERPSE10 5.4.P.007. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Three forces acting on an object are given by F, = (-1.91 + 5.50j) N, F2 = (4.951 - 1.5j) N, and F3 = (-501) N. The object experiences an acceleration of magnitude 3.50 m/s. (a) What is the direction of the acceleration? 4.87 X Note that the direction of the acceleration is the same as the direction of the net force. (counterclockwise from the +x-axis) (b) What is the mass of the object? 13.46 kg (c) If the object is initially at rest, what is its speed after 15.0 s? 52.5 m/s (d) What are the velocity components of the object after 15.0 s? (Let the velocity be denoted by v.) V = -52.2 vi+ 4.35 X If the initial velocity is zero, a constant acceleration will generate a velocity oriented in the same direction as the acceleration.j ) m/s Need Help? Read It Watch It13. [1/3 Points] DETAILS PREVIOUS ANSWERS SERPSE10 5.7.OP.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A bag of cement weighing 350 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles 0, = 62.0 and 0, = 38.0 with the horizontal. Assuming the system is in equilibrium, find the tensions 71, 72, and 73 in the wires. T1 =L 182.7 X Consider the net force at the point where the three wires come together. What is the acceleration of this point? N 306.53 T , X The horizontal component of your 7, is not equal to the horizontal component of your 72, so the object would be accelerating horizontally. N T3 = 350 VN T CEMENT 4 Need Help? Read It Watch It15. [0/3 Points] DETAILS PREVIOUS ANSWERS SERPSE10 5.7.P.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An object of mass m, = 3.90 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m, = 8.70 kg as shown in the figure. m mo A (a) Draw free-body diagrams of both objects. Chon tep Khong co tep nao duoc chon This answer has not been graded yet. (b) Find the magnitude of the acceleration of the objects. 3.03 X If my = 0, what would you expect the acceleration to be? Rework your solution to see if you get the expected result. m/s2 (c) Find the tension in the string. 11.82 X You appear to have correctly calculated the tension using your incorrect value from part (b). N Need Help? Read It Watch It16. [1/4 Points] DETAILS PREVIOUS ANSWERS SERPSE1OS.A.OP.O42. MY NOTES ASK YOUR TEACHER PRACTICE ANC A block and sphere are connected by a cord that passes over a pulley as shown. Neglect friction and assume the cord is massless. Take m1 : 2.00 kg, 1772 : 7.45 kg, and 6 : 50.0\". G) (a) What are the magnitude of acceleration (in m/sQ) of the block and sphere? x Write Newton's second law for each object. What forces act on each object? How are the tension forces that act on each object related? How are the accelerations related? mfs2 (b) What is the tension (in N) in the cord? (Enter the magnitude.) x Use one of your secondalaw equations and the result from part (a) to solve for T. N (c) What is the speed (in m/s) of each object 2.50 s after being released from rest? x It seems as if you have calculated the distance the system has moved. Use vf = V,- + at a VF = at and the result from part (a) to find vf. m/s (d) What If? If the incline under m2 is rough, what is the minimum value of the coefficient of static friction ,us for which the system will not move? AirJ