Answer the multiple-choice questions below. 1. An object is moving…
Question Answered step-by-step Answer the multiple-choice questions below. 1. An object is moving… Answer the multiple-choice questions below.1. An object is moving along a straight, flat section of track. The net force acting on the object as a function of position is shown in the graph, where the positive direction is in the direction of motion of the object. Assuming the object moves from position x=0 to x=7do, without stopping or moving backward, which of the following statements about its motion are correct? Select two answers.a) the object has its greatest kinetic energy at position 5d0. b) the kinetic energy of the object at position do, is greater than 2F0d0. c) the object has the same kinetic energy at position d0, that it has at position 7d0.d) the kinetic energy of the object is not changing when it is between positions d0 and 3d0. 2. Two blocks of equal mass are connected by a string that passes over a pulley, as shown in the figure. Block 1 hangs from the string, and block 2 can slide on a table. The system is released from rest. Using conservation of energy, a student derives an expression for the speed v of block 1 when it has fallen a distance h after the system has been released from rest and obtains the equation v=gh. The experiment is performed and both h and v are measured, but the measured value of vis larger than the calculated value using the student’s equation. Which of the following sources of experimental error could have caused the discrepancy?a) Friction between the table and block 2 is not negligible. b) The mass of block 2 is actually greater than the mass of block 1. с) Air resistance is not negligible. d) There is friction between the rim of the pulley disk and the string. e) The table is not horizontal. 3. A cylinder at rest is released from the top of a ramp, as shown above. The ramp is 1.0 m high, and the cylinder rolls down the ramp without slipping. At the bottom of the ramp, the cylinder makes a smooth transition to a small section of a horizontal table and then travels over the edge at a height of 1.0 m above the floor, eventually landing on the floor at a horizontal distance of 1.5 m from the table. A sphere with the same mass and radius as the original cylinder, but a smaller rotational inertia, is released from rest from the top of the ramp. Ks and Kc are the sphere’s and the cylinder’s total kinetic energy at the bottom of the ramp, respectively. How do Ks and Kc compare, and why?a) Ks < Kc, because the sphere will gain less rotational kinetic energy.b) Ks < Kc, because the sphere has a greater acceleration and therefore has less time to gain kinetic energy.c) Ks < Kc, because both objects accelerate at the same rate.d) Ks < Kc , because the gravitational force does equal work on each object as it rolls down the ramp. Science Physics SCIENCE 432 Share QuestionEmailCopy link Comments (0)
