Mathematics
A cylindrical water tank of diameter 2.8 m and height 4.2 m is being fed by a pipe of diameter 7 cm through which water flows at the rate of 4 m s-1. Calculate, in minutes, the time it takes to fill the tank.
Related Questions
The cross-section of a tunnel is a square of side 7 m surmounted by a semicircle as shown in the adjoining figure. The tunnel is 80 m long. Calculate:
(i) its volume,
(ii) the surface area of the tunnel (excluding the floor) and
(iii) its floor area.
Water flows, at 9 km per hour, through a cylindrical pipe of cross-sectional area 25 cm2. If this water is collected into a rectangular cistern of dimensions 7.5 m by 5 m by 4 m; calculate the rise in level in the cistern in 1 hour 15 minutes.
The given figure shows the cross-section of a cone, a cylinder and a hemisphere all with the same diameter 10 cm, and the other dimensions are as shown.
Calculate :
(i) the total surface area,
(ii) the total volume of the solid and
(iii) the density of the material if its total weight is 1.7 kg.
