Question

Найдите объем и площадь наружной поверхности бака без крышки 80*90*70. сколько понадобится краски, чтобы покрасить этот бак снаружи и изнутри, если на покраску 1 дм2 нужно 2 г. краски? сколько литров бензина можно влить в этот бак?

Answer 1

Так как объем нужно выразить в литрах, то измерения переводим в дециметры и умножаем, 9*8*7=504 л.
Площадь основания 63 квадр. дм.
Площадь передней грани 72 квадр. дм.
Площадь торца 56 квадр.дм.
Суммируем 2 передних, 2 торца и одно основание (ведь без крышки)

получаем 319 кв.дм.
Краски понадобится 638 г.

 

 

НЕЗАБУДЬ ПОБЛАГОДАРИТЬ!!!

Answer 2

Calculation of Volume and Surface Area of the Tank

To find the volume and surface area of the tank without the lid, we can use the given dimensions of the tank: 80 cm (length), 90 cm (width), and 70 cm (height).

The volume of the tank can be calculated using the formula: Volume = length × width × height. Substituting the given values, we get: Volume = 80 cm × 90 cm × 70 cm = 504,000 cm³.

The surface area of the tank can be calculated by adding the areas of all its faces. Since the tank does not have a lid, we need to calculate the areas of the five faces: the top, bottom, front, back, and sides.

The area of each face can be calculated as follows: - Top and bottom faces: Area = length × width. - Front and back faces: Area = length × height. - Side faces: Area = width × height.

Substituting the given values, we get: - Area of the top and bottom faces = 80 cm × 90 cm = 7,200 cm². - Area of the front and back faces = 80 cm × 70 cm = 5,600 cm². - Area of the side faces = 90 cm × 70 cm = 6,300 cm².

To find the total surface area, we add the areas of all the faces: Total Surface Area = 2 × (Area of top and bottom faces) + 2 × (Area of front and back faces) + (Area of side faces). Substituting the calculated values, we get: Total Surface Area = 2 × 7,200 cm² + 2 × 5,600 cm² + 6,300 cm² = 32,900 cm².

Therefore, the volume of the tank is 504,000 cm³ and the surface area of the tank without the lid is 32,900 cm².

Calculation of Paint Required

To calculate the amount of paint required to paint the tank both on the outside and inside, we need to know the paint coverage rate. According to the given information, 2 grams of paint is required for every 1 square decimeter (dm²) of surface area.

Converting the surface area from cm² to dm², we get: Surface Area in dm² = Surface Area in cm² ÷ 100. Substituting the calculated value, we get: Surface Area in dm² = 32,900 cm² ÷ 100 = 329 dm².

To calculate the amount of paint required, we multiply the surface area in dm² by the paint coverage rate: Amount of Paint Required = Surface Area in dm² × Paint Coverage Rate. Substituting the given values, we get: Amount of Paint Required = 329 dm² × 2 g/dm² = 658 g.

Therefore, 658 grams of paint will be required to paint the tank both on the outside and inside.

Calculation of Fuel Capacity

To calculate the fuel capacity of the tank, we need to know the density of the fuel and assume that the tank is completely filled.

Unfortunately, the density of the fuel is not provided in the given information. Therefore, we cannot accurately calculate the fuel capacity of the tank without this information.

Please provide the density of the fuel so that we can calculate the fuel capacity accurately.