# Mass + area - practice problems

#### Number of problems found: 77

- Three sigma rule

Stomach weights are normally distributed, with a mean of 1314g and a standard deviation of 113g. State the probability that a randomly selected stomach weighs more than 1118g. (Report the probabilities using at least four decimal places. ) - Centimeters 61934

How much pressure on the rails will cause an empty truck weighing 20 tons if the contact area of all wheels and rails is 16 square centimeters - Pipe thickness

The outer circumference of the tube is 32cm. Its length is 60cm, density 8.5g/cm³ and weight 9.495kg. Calculate the wall thickness of the pipe. - Aluminum cylinder

The aluminum cylinder weighs 1400 g and is 26 cm high. Its density is 2700 kg/m³. Calculate the base area of the cylinder and express the result in cm². - Kilos of meat

Marry bought 6 1/3 kg of meat. Anita used 2 1/4 kilograms, Maros 2 1/8 kg, and the rest, Adam. How many kilograms of meat did she use for Adam? - Kilograms 48761

Matthew paints his room. He paints square walls. He painted a wall with a side of 3 m and consumed 5 kg of paint. How many kilograms of paint will he need on a wall with a side length of 6 m? - School model

The beech school model of a regular quadrilateral pyramid has a base 20 cm long and 24 cm high. Calculate a) the surface of the pyramid in square decimeters, b) the mass of the pyramid in kilograms if the density of the beech is ρ = 0,8 g/cm^{3} - Empty aquarium

How much does an empty aquarium weigh with dimensions: length = 40 cm, width = 30 cm, height = 20 cm, if 1 dm² of glass weighs 300 g? Calculate its weight in kilograms. - Temperatures) 41991

Calculate the radiator output if it has a thermal gradient (difference between inlet water and return temperatures) a) 5 ° C b) 10 ° C c) 15 ° C d) 20 ° C A heating water volume flow is 45 kg / h. How fast the water flows from the supply pipe to the radia - Locomotive 40441

What is the pressure on the tracks when a 10-ton locomotive with eight wheels stands on them, and each wheel has a contact area of 4 cm²? - Cross-section 37443

What is the mass of an iron bar 1.5 m long, the cross-section of which is a rhombus with side a = 45 mm and a corresponding height of 40 mm? Iron density ρ = 7.8 g / cm³? What is the surface of the iron rod? - Sand loading

The truck, with a load capacity of 7 tons, has a storage area of 4.5 m and 2.1 m. The weight of 1 m³ of wet sand is 2,000 kg. How high can we load the sand so that the car's load capacity is not exceeded? - Hydraulic 36021

The small piston of the hydraulic jack has a capacity of 40 cm² and a large 120 cm². How heavy will a body lift when a man weighing 70 kg stands on a small piston? - Hydraulic 35301

The hydraulic jack has pistons with a capacity of 6 cm² and 360 cm². How much force do we have to apply to the smaller piston to be able to lift a body weighing 180 kg on the larger piston? - Efficiency 35023

The cellar, which has a floor area of 50 m^{2}, 3 m below ambient level, was flooded with water to a height of 80 cm. How long does it take for a pump with a power input of 1 kW and an efficiency of 75% (η = 0.75) to drain the water? - Fertilizer 34851

Urea contains 45% nitrogen. How much fertilizer will be needed per 1 hectare if you supply 30 kg of pure nitrogen? - Find the

Find the pressure exerted by a crawler tractor of mass 30 t standing on a flat road if the area of the contact surface of the belts with the ground is 6 m square. - Block-shaped 32591

Štěpán painted a block-shaped steel board measuring 2.2 m, 1.5 m, and 1.6 m twice with a protective coating. How many kilograms of paint to consume if he used 120g of paint per 1m²? - Block-shaped 31741

We will paint the block-shaped pool with the dimensions of the bottom a = 25 m and b = 15 m, and the height c = 3.5 m. How many kg of paint will we need, if one kg is enough for 5 square meters of paint? - Hectares 31661

Express the yield per hectare of sugar beet when you know that we can harvest 20 tons of sugar from 20 hectares of fields.

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