Mechanics. Problems in Undergraduate Physics by S. P. Strelkov

By S. P. Strelkov

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The scales are bal­ anced whilst the capstan is braked and the string is not unwinding. What change must be made in the weights in the second scale of the balance in order to re-establish the equilibrium when the capstan rotates due to the load being allowed to fall downwards? 228. Under what conditions do the scales achieve a balance in the device described in the previous problem, when the load on the model capstan moves upwards due to the inertia of the untwisting flywheel? 48 PROBLEMS 229. The arrangement of a demonstration device (Maxwell disc) is illustrated in Fig.

Will the box move after the body has fallen into it? 184. The last truck gets uncoupled from a train travelling at constant speed and traverses a distance / before coming to rest. What will be the distance from the train to the wagon at the instant when the latter comes to rest, if the locomotive traction is constant, and the friction of each part of the train is independent of its speed and proportional to its weight? 185. A boat of mass M has a man of mass m standing on it and is at rest in a calm sea.

The points B, C and D are assumed to be hinged freely. 126. The length of a balance beam 2/ = 30 cm, the weight of the beam/? = 300 g, the length of the pointer D = 30 cm. An overload 29 STATICS p = 0-01 g on one of the scales causes to the point to deviate k = 0-3 cm from the vertical. Find the distance d of the centre of gravity of the beam from the rib of the prism. 127. What minimum coefficient of friction k is required between the wall of a cube and a horizontal plane in order for it to tilt about its rib as the result of a horizontal force F being applied to the upper face?

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