1.The total momentum of a system is the same at a later time as at an earlier ti
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Question
1.The total momentum of a system is the same at a later time as at an earlier time if there are no (check one)
? collisions between particles within the system.
? inelastic collisions between particles within the system.
? changes of momentum of individual particles within the system.
? internal forces acting between particles within the system.
? external forces acting on one or more particles of the system.
2.An ice skater spins with her arms extended and then pulls her arms in and spins faster. Friction is negligible. Which statement is correct? (check one)
? Her kinetic energy of rotation does not change because, by conservation of angular momentum, the fraction by which her angular velocity increases is the same as the fraction by which her rotational inertia decreases.
? Her kinetic energy of rotation increases because of the work she does to pull her arms in.
? Her kinetic energy of rotation decreases because of the decrease in her rotational inertia.
? Her angular momentum increases because of the decrease in her rotational inertia.
? Her angular momentum increases because of the increase in her rotational velocity.
3.A cylinder is rolling without slipping down an inclined plane (angle ?). What is the work done by the friction force while the cylinder rolls a distance x (?s is the coefficient of static friction between the plane and the cylinder)? (check one)
4.As shown in the figure, two weights are hanging on a uniform wooden bar that is 100 cm long and has a mass of 200 g. Is this system in equilibrium? (check one)
? yes.
? no.
? cannot be determined.
? Depends on the value of the normal force.
The total momentum of a system is the same at a later time as at an earlier time if there are no (check one) collisions between particles within the system. inelastic collisions between particles within the system. changes of momentum of individual particles within the system. internal forces acting between particles within the system. external forces acting on one or more particles of the system. An ice skater spins with her arms extended and then pulls her arms in and spins faster. Friction is negligible. Which statement is correct? (check one) Her kinetic energy of rotation does not change because, by conservation of angular momentum, the fraction by which her angular velocity increases is the same as the fraction by which her rotational inertia decreases Her kinetic energy of rotation increases because of the work she does to pull her arms in. Her kinetic energy of rotation decreases because of the decrease in her rotational inertia. Her angular momentum increases because of the decrease in her rotational inertia. Her angular momentum increases because of the increase in her rotational velocity. A cylinder is rolling without slipping down an inclined plane (angle ?). What is the work done by the friction force while the cylinder rolls a distance x (?s is the coefficient of static friction between the plane and the cylinder)? (check one) + mu smog sin theta mu smog sin theta +mix sin theta -mix sin theta zero. Need more information. As shown in the figure, two weights are hanging on a uniform wooden bar that is 100 cm long and has a mass of 200 g. Is this system in equilibrium? (check one) yes. no. cannot be determined. Depends on the value of the normal force.Explanation / Answer
1) external forces acting on one or more particles of the system.
2) Her kinetic energy of rotation increases because of the work she does to pull her arms in.
3) zero
4) no.
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