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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 1] The Extrema of a Function of One Argument 89<br />

865. It is required to make an open rectangular box of greatest<br />

capacity out of a square sheet of cardboard with side a by cutt<strong>in</strong>g<br />

squares at each of the angles and bend<strong>in</strong>g up the ends of the<br />

result<strong>in</strong>g cross-like figure.<br />

866. An open tank with<br />

of v litres. What size will it<br />

a square base<br />

be if the least<br />

must have a capacity<br />

amount of t<strong>in</strong> is used?<br />

867. Which cyl<strong>in</strong>der of a surface?<br />

given volume has the least overall<br />

868. In a given sphere <strong>in</strong>scribe a cyl<strong>in</strong>der with the greatest volume.<br />

869. In a given sphere <strong>in</strong>scribe a cyl<strong>in</strong>der hav<strong>in</strong>g the greatest<br />

lateral surface.<br />

870. In a given sphere <strong>in</strong>scribe a cone with the greatest volume.<br />

871. Inscribe <strong>in</strong> a given sphere a right circular cone with the<br />

greatest lateral surface.<br />

872. About a given cyl<strong>in</strong>der circumscribe a right cone of least<br />

volume (the planes and centres of their circular bases co<strong>in</strong>cide).<br />

873. Which of the cones circumscribed about a given sphere<br />

has the least volume?<br />

874. A sheet of t<strong>in</strong> of width a has to be bent <strong>in</strong>to an open<br />

cyl<strong>in</strong>drical channel (Fig. 26). What should the central angle cp be<br />

so that the channel will have maximum capacity?<br />

D<br />

N<br />

I<br />

Fig. 27<br />

875. Out of a circular sheet cut a sector such that when made<br />

<strong>in</strong>to a funnel it will have the greatest possible capacity.<br />

876. An open vessel consists of a cyl<strong>in</strong>der with a hemisphere<br />

at the bottom; the walls are of constant thickness. What will the<br />

dimensions of the vessel be if a m<strong>in</strong>imum of material is used for<br />

a given capacity?<br />

877. Determ<strong>in</strong>e the least height h = OB of the door of a ver-<br />

tical tower ABCD so that this door can pass a rigid rod MN of<br />

length /, the end of which, M, slides along a horizontal straight<br />

l<strong>in</strong>e AB. The width of the tower is d

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