By T. Heddle

ISBN-10: 0080158293

ISBN-13: 9780080158297

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**Extra resources for Calculations in Fundamental Physics. Mechanics and Heat**

**Example text**

It follows that 1 Ν approximately equals the weight of a body of mass ^ kg. When an object hangs at rest on a spring balance, the extension of the spring depends upon the apparent weight of the object. 81 m s~ . However, the extension for a given mass may be increased or decreased by using the balance under abnormal conditions, as in the question. Although under such conditions the scale of the spring indicates an incorrect mass, it gives a measure of the force which the spring exerts by its tension.

So Ffi = fiFni = 025Fni. 6 cos 30°. ·. 25 N . 6 sin 30°. 6 N. ai (b) If Fa is now increased, the friction first decreases, reaching zero when Fa alone balances the component of weight down the slope. Further increase of Fa produces a tendency to slide u p , with friction opposing again. Eventually if Fa reaches the minimum value Fa2 needed for upward movement. 8 (Fig. 19). Here Ff% is equal to the maximum value calculated for (a) but in the reverse direction. 8 = 14 N . COMBINATIONS OF FORCES FIG.

A heavy cable running above ground is supported on vertical poles. The route changes direction by 30° at one pole, where the side strain is taken symmetrically by a stay at 70° to the horizontal, attached to the top of the pole. Each part of the cable leaves the pole at 10° to the horizontal and has a tension of 250 N . Calculate the tension in the stay, assuming no horizontal force due to the pole itself. 8. W O R K E D EXAMPLE A square plate of metal of uniform thickness has a side of length 30 cm.

### Calculations in Fundamental Physics. Mechanics and Heat by T. Heddle

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