Elliott Beck

01/13/2023 · Senior High School

7. When 3 litres of oil are removed from an upright cylindrical can, the level falls by 10 cm . Find the radius of the can. 8. A solid cylinder of radius 4 cm and length 8 cm is melted down and recast into a solid cube. Find the side of the cube. 9. A solid rectangular block of copper 5 cm by 4 cm by 2 cm is drawn out to make a cylindrical wire of diameter 2 mm . Calculate the length of the wire. 10. Water flows through a circular pipe of internal diameter 3 cm at a speed of \( 10 \mathrm{~cm} / \mathrm{s} \). If the pipe is full, how much water flows from the pipe in one minute? (Answer in litres.) 11. Water flows from a hose-pipe of internal diameter 1 cm at a rate of 5 litres per minute. At what speed is the water flowing through the pipe? 12. A cylindrical metal pipe has external diameter of 6 cm and internal diameter of 4 cm . Calculate the volume of metal in a pipe of length 1 m . If \( 1 \mathrm{~cm}{ }^{3} \) of the metal has a mass of 8 g , find the mass of the pipe.