Practical Physics

Cover Practical Physics
Practical Physics
Glazebrook, Richard, Sir, 1854-1935
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VI. § e.
o G. Let the direction of the string, supposed horizontal, cut the displaced position of this line in q (fig. xiii), then cosec © = o q/q n, and 4 7r2 «a * Q N The following is another method of finding k.
Attach to the given body, so as to vibrate about the same axis, another body whose moment of inertia about the axis can be calculated. Let k' be this moment of inertia, m' the mass of the body, and h! the distance from o of its centre of gravity. Observe the time of vibration ; let i
...t be \\n\ then we have ^ - 4 TT^ K + K' ' • From these two equations we can eliminate m h^ and if m', h^ and k' are known, can find k.
Experiment — A rectangular bar of iron is made to vibrate abo\it a knife-edge near one end at right angles to its length.
Find the value of its moment of inertia, (i) by the first method ; (2) by attaching to one end a sphere of lead F. Ballifltio Pendulum. Measurement of Moment of Momentum and of Momentum.
If a moving body (^.j:, a moving iron ball or a hammer head) comes in contact with a heavy body (called for brevity a ballistic pendulum) having a definite position of equili- brium, but free to rotate about a horizontal axis, then (i) thie momentum of the moving body is changed by the impact, and the change of momentum measures the impulse of the Digitized by VjOOQ IC Ch.


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