2. There is a square wood, which is 0.5m long and 2cm in cross section. How big is the square wood when it is flat? What is the volume? Answer: When tiled, the area is 100 cm2; The volume is 200 cubic centimeters.
There are four rectangular columns in the school auditorium, which are 4cm long and 6m high. Now these columns need painting for decoration. How many square meters is the painting area? If you need to brush 0.3 kg per square meter, how much kg does a * * * need to brush? A: the painting area is128m2; A * * * needs 38.4 kilograms of paint.
There is a cuboid glass jar, which is 3cm long and 2cm wide. After putting an irregular stone, the water depth is 1.5 decimeter, and after taking out the stone, the water surface drops by 0.5 decimeter. What is the volume of this stone?
5. The volume of a cubic water tank is 125 cubic decimeter. Pour all the water in this tank into a rectangular water tank. It is known that the cuboid water tank is 10 decimeter long and 5 decimeters wide. What is the depth of this water tank?
The school has a bunker with a length of 43 centimetres, a width of 34 centimetres and a depth of 5 centimetres. The sand surface in the bunker is away from the pit mouth 1 decimeter. What is the volume of sand in the bunker? If the sand per cubic decimeter weighs1.4kg, how many kilograms of sand does it take to fill this bunker?
7. There is a 6-meter-long cubic water tank. After it was filled with water, it was poured into a rectangular water tank, and the water depth was measured as 3 minutes. What is the bottom area of this rectangular water tank?
8. The cuboid fuel tank has a volume of 20 liters. The bottom of this oil tank is 25 cm long and 20 cm wide. What is the depth of the fuel tank?