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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 8 | A turntable has a moment of inertia of 3.00*10^-2 kg*m^2 and spins freely on a frictionless bearing at 25.0 rev/min. A 0.300-kg ball of putty is dropped vertically onto the turntable and sticks at a point 0.100 m from the center. What is the new rate of rotation of the system? | 22.7 rev/min | |
| 8 | A turntable has a moment of inertia of 3.00*10^-2 kgm^2 and spins freely on a frictionless bearing at 25.0 rev/min. A 0.300-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.100 m from the center. By what factor does the angular momentum of the system change after the putty is dropped onto the turntable? | 1.00 (no change) | |
| 8 | A uniform 1.0-N meter stick is suspended horizontally by vertical strings attached at each end. A 2.0- N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50 cm position, and a 3.0-N weight is suspended from the 60 cm position. What is the tension in the string attached at the 100-cm end of the stick? | 3.5 N | |
| 8 | A uniform bridge span weighs 50.0*10^3 N and is 40.0 m long. An automobile weighing 15.0*10^3 N is parked with its center of gravity located 12.0 m from the right pier. What upward support force does the left pier provide? | 29.5*10^3N | |
| 8 | A uniform solid sphere rolls down an incline of height 3 m after starting from rest. In order to calculate its speed at the bottom of the incline, one needs to know: | no more than is given in the problem. | |
| 8 | A uniform, horizontal beam of length 6.0 m and weight 120 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium? | 69 N | |
| 8 | A vault is opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. Find the torque due to this force about an axis through the hinges. | 240 Nm | |
| 8 | A ventilation fan with a moment of inertia of 0.034 kg*m^2 has a net torque of 0.11 N*m applied to it. What angular acceleration does it experience? | 3.2 rad/s^2 | |
| 8 | A ventilation fan with a moment of inertia of 0.034 kg*m^2 has a net torque of 0.11 N×m applied to it. If it starts from rest, what angular momentum will it have 8.0 s later? | 0.88 kg*m^2/s | |
| 8 | A ventilation fan with a moment of inertia of 0.034 kg*m^2 has a net torque of 0.11 N×m applied to it. If it starts from rest, what kinetic energy will it have 8.0 s later? | 11 J | |
| 8 | A woman who weighs 500 N stands on an 8.0-m-long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing? | 1.6 m | |
| 8 | According to Newton's second law, the angular acceleration experienced by an object is directly proportional to: | the net applied torque. | |
| 8 | An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 20 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder. | 1.7&10^2 N | |
| 8 | An 800-N billboard worker stands on a 4.0-m scaffold supported by vertical ropes at each end. If the scaffold weighs 500 N and the worker stands 1.0 m from one end, what is the tension in the rope nearest the worker? | 850 N | |
| 8 | An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550 N in that rope? | 2.5 m |
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