Angular momentum problems with answers
Questions
Big Ben (Fig. P10.42), the Parliament tower clock in London, has hour and minute hands with lengths of 2.70 m and 4.50 m and masses of 60.0 kg and 100 kg, respectively. Calculate the total angular momentum of these hands about the center point. Treat the hands as long, thin, uniform rods. 2.4 kg.m2/s. 1.2 kg.m2/s. 3.6 kg.m2/s. 8.
[DOC File]ANSWERS - AP Physics Multiple Choice Practice – Torque
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Jul 12, 2012 · Total momentum before must equal total momentum after. Before, there is an x momentum of (2)(1.5)=3 and a y momentum of (4)(1)=4 giving a total resultant momentum before using the Pythagorean theorem of 5. The total after must also be 5. Just as linear momentum must be conserved, angular momentum must similarly be conserved.
[DOC File]Practice Problems for TEST II, PHY2020
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Free from external torques means angular momentum (L=I() is conserved. Thus the new ( = 3 * 100 rad/s = 300 rad/s, since (new * Inew has to equal the given (initial) ( of 100 rad/s times Iinitial. This is just like the spinning person in the chair who decreases their moment of inertial by pulling weights in closer to the axis of rotation ...
[DOC File]Higher Education Books Blog
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10-15 Angular Momentum. 10-16 Newton’s Second Law in Angular Form. 10-17 The Angular Momentum of a System of Particles. 10-18 The Angular Momentum of a Rigid Body Symmetrically Rotating About a Fixed Axis. 10-19 Conservation of Angular Momentum. Reasoning Type Questions. Multiple Choice Questions. Questions. Problems. Additional Problems ...
[DOCX File]Weebly
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Oct 05, 2014 · Calculate the angular momentum of a ballet dancer who is spinning at 1.5 rev/sec. Model the dancer as a cylinder (I = ½ MR2) with a mass of 62 kg, a height of 1.6 m and a radius of 0.16 m. A student of mass 42 kg is standing at the center of a merry-go-round of radius 3.4 m and a moment of inertia of 840 kg-m2 that is rotating at ω = 1.8 rad/s.
[DOC File]Chapter 10
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26• A woman with mass 50.0 kg is standing on the rim of a large disk that is rotating at 0.50 rev/s about an axis perpendicular to it through its center. The disk has a mass of 110 kg and a radius of 4.0 m. Calculate the magnitude of the total angular momentum of the woman-plus-disk system, assuming that you can treat the woman as a point. 27.
[DOC File]Chapter 5A - Wake Forest University
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When its angular velocity is 10 rad/s, its angular momentum (in kg · m2/s) is. a. 50. b. 20. c. 40. d. 25. e. 70. 15. A puck on a frictionless air hockey table has a mass of 5.0 g and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of ...
[DOC File]Practice Problems for TEST II, PHY2020
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Erot. Kin. Energy = ½ I(2 L(angular momentum)=I(I(moment of Inertia) is for a point mass a distance ‘r’ from the axis of rotation=mr2 (If you need a moment of inertia for a special problem – as long as that’s not the question – you will be given it.) ... Practice Problems for Test 2 Chapters 8-13. 3 sig figs on all answers – I have ...
[DOC File]AP PHYSICS C – Mechanics 1987 - Ryono
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Linear momentum is not conserved! Hmm... Why? The hinge exerts an external force on the system. Notice that the hinge force exerts no torque on the system and hence angular momentum is conserved. ... We haven't used conservation of angular momentum yet! L0 = Lf . 12 = (We'll resolve the velocity to find a component, ) 12 = 1.44(5) + 1.2(1 ...
[DOC File]Chapter 8: Rotational Motion
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Angular momentum analogous to Linear Momentum ( An object moving in a straight line has an angular momentum about the pivot point O. Newtons 2nd Law for Torques in momentum form. Conservation of Angular Momentum. If the resultant external torque acting on a system is zero, the total angular momentum of the system is constant.
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