A hollow garden roller of 42 cm diameter and length 152 cm is made
of cast iron 2 cm thick. Find the volume of iron used in the roller
A river 2 m deep and 45 m wide is flowing at the rate of 3 km per
hour. Find the amount of water in cubic metres that runs into the
sea per minute
A cuboidal tin box opened at the top has dimensions 20 cm × 16 cm × 14 cm. What is the total area of metal sheet required to make 10 such boxes?
Radius of a cylinder is r and the height is h. Find the change in the
volume if the
(a) height is doubled.
(b) height is doubled and the radius is halved.
(c) height remains same and the radius is halved.
The thickness of a hollow metallic cylinder is 2 cm. It is 70 cm long
with outer radius of 14 cm. Find the volume of the metal used in
making the cylinder, assuming that it is open at both the ends. Also
find its weight if the metal weighs 8 g per cm3.
The radius and height of a cylinder are in the ratio 3:2 and its
volume is 19,404 cm3. Find its radius and height.
How many cubic metres of earth must be dug to construct a well 7
m deep and of diameter 2.8 m?
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