Advertisements
Advertisements
प्रश्न
Water in a canal 30 cm wide and 12 cm deep, is flowing with a velocity of l00 km per hour.How much area will it irrigate in 30 minutes if 8 cm of standing water is desired?
Advertisements
उत्तर
Given that,
Water in the canal forms a cuboid of
width `(h)=300cm=3m`
`height = 12 cm = 1.2 m`
length of cuboid is equal to the distance travelled in 30 min with the speed of 100 km per hour
∴ length of cuboid = `100xx 30/60km=50000 meters`
So, volume of water to be used for irrigation = `50000xx3xx1.2m3`
Water accumulated in the field forms a cuboid of base area equal to the area of the field and height equal to `8/(100) meters `
`∴ (Area of field)xx8/(100)= 50,000xx3xx1.2`
`⇒Area of field = (50000xx3xx1.2xx100)/8 `
`2,250000 meters `
APPEARS IN
संबंधित प्रश्न
A cuboidal water tank is 6 m long, 5 m wide and 4.5 m deep. How many litres of water can it hold? (1 m3 = 1000l)
A village, having a population of 4000, requires 150 litres of water per head per day. It has a tank measuring 20 m × 15 m × 6 m. For how many days will the water of this tank last?
Half cubic meter of gold-sheet is extended by hammering so as to cover an area of 1 hectare. Find the thickness of the gold-sheet.
The external dimensions of a closed wooden box are 48 cm, 36 cm, 30 cm. The box is made of 1.5 cm thick wood. How many bricks of size 6 cm x 3 cm x 0.75 cm can be put in this box?
A rectangular tank is 80 m long and 25 m broad. Water flows into it through a pipe whose cross-section is 25 cm2, at the rate of 16 km per hour. How much the level of the water rises in the tank in 45 minutes.
A child playing with building blocks, which are of the shape of the cubes, has built a structure as shown in Fig. 18.12 If the edge of each cube is 3 cm, find the volume of the structure built by the child.
Volume of a cuboid is 34.50 cubic metre. Breadth and height of the cuboid is 1.5m and 1.15m respectively. Find its length.
The volume of a cuboid is 660 cm3 and the area of the base is 33 cm2. Its height is
Volume of regular solids such as cube and cuboid can be found by multiplying the dimensions. Complete the given table by finding the volume of the given objects
| S.No. | Objects | l | b | h | Volume (cubic cm) |
| 1. | Note books | 6 cm | 15 cm | 1 cm | |
| 2. | Name board | 20 cm | 90 cm | 2 cm | |
| 3. | Show case cub board | 70 cm | 250 cm | 70 cm | |
| 4. | Gift box | 10 cm | 10 cm | 10 cm | |
| 5. | Dice | 1 cm | 1 cm | 1 cm |
How many small cubes with edge of 20 cm each can be just accommodated in a cubical box of 2 m edge?
