PLEASE HELP ME WITH THIS PHYSICS ASSIGNMENT THERES A TIME LIMIT

Time left 2:29:14 Question 7 Which of the graphs best represents a relationship from simple harmonic motion? Not yet a. C. answered acceleration Marked out of 1.00 Flag displacement question b d displacement The correct selection isQuestion 8 A block attached to a spring with a spring constant of 8.45 x 104 N/m oscillates on a horizontal frictionless surface with an amplitude Not yet answered of 21.8 cm. If the maximum speed of the mass is 9.65 m/s, then the block has a mass of kg. (Record your three-digit Marked out of answer on the answer sheet.) 1.00 Flag questionQuestion 9 A 1.25-kg pendulum bob is attached to a 2.50 m long string. The pendulum is pulled sideways until the string makes an angle of Not yet 15.0 with the vertical. What is the restoring force acting on the pendulum? answered Marked out of Select one: 1.00 O a. 2.91 N Flag question O b. 3.17 N O c. 2.64 N d. 3.29 NQuestion 10 A mass of 7.50 kg is attached to a spring with a spring constant of 1.80x 10 N/m so that is oscillates on a horizontal frictionless Not yet answered surface. If the amplitude of the oscillation is 15.0 cm, then the magnitude of the maximum acceleration of the mass is Marked out of m/s2. (Record your three-digit answer here in units of m/s2.) 1.00 Flag questionQuestion 11 Block on a Spring Not yet answered A block on a horizontal frictionless surface attached to a spring. Diagram is not to scale. Time left 2:28:5 Marked out of 1.00 -X max Flag + Xmax question III 0008040908008080800800 Refer to the above diagram Block on a Spring to answer this question. A block on a horizontal frictionless surface is attached to a spring, as shown in the diagram. When the block is released, it oscillates back and forth between the positions indicated by the vectors max . Which points (I, II, and Ill) best indicate where the acceleration of the block will have the greatest magnitude? Select one: O a. land Il O b. Il and Ill O c. Il only O d. I and IllQuestion 12 The graph shows data taken during an experiment to verify Hooke's law. What is the spring constant for the spring used in the Not yet experiment? answered Marked out of 1.00 Flag 12 question 10 Force - F (x 10* N) A N 10 15 20 Position -x (x 102 m) Select one: O a. 7.5 x 103 N/m O b. 6.7 x 103 N/m O c. 9.5 x 103 N/m O d. 1.5 x 104 N/m