By Philippe Depondt
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Extra resources for L'entropie et tout ça - Le roman de la thermodynamique
Compare the times taken for each body to roll (from rest) down the plane with that taken by a body to slide (also from rest) down a smooth plane of the same length and slope. 75. Masses of 145 and 155 gm. are attached by a light string and hung freely on either side of a pulley of mass 20 gm. 6 cm. 2 Calculate a value for the acceleration of gravity (a) neglecting the mass of the pulley, (b) taking it into account. ) 22 MECHANICS AND HYDROSTATICS WORKED EXAMPLE 76. , is brought to rest after completing 3o revolutions when a steady opposing couple of I oo gm.
Cm. units = too X 981 dynecm. units, and the work done by the couple in operating through an angle (0) of 3o X 27V radians = CO = I oo X 981 X 3o X 27r ergs. 2 units. 2 Hence, since the flywheel is initially at rest, the angular velocity acquired by it in 5 sec. 29 radians per sec. 77. Describe, with full experimental details, how you would determine the moment of inertia of a flywheel. 2 rotating at 5o rev. per sec. is brought to rest by the friction of the bearings after completing a further ioo rev.
And is then released. Find the period of the motion, and also the kinetic energy with which the mass passes through the mean position of the motion. ) zoo. Explain what is meant by simple harmonic motion. Consider the following cases—a swinging balance, a mass, on the end of a spring, oscillating in the vertical direction, a simple pendulum swinging backwards and forwards. Are these cases of simple harmonic motion ? Give reasons for your answer. A compound pendulum can swing about a given axis about which its moment of inertia is 5 X 1o6 gm.