# Density + fundamentals of Physics - practice problems

#### Number of problems found: 93

- A fuel

A fuel tank has 28 gallons of fuel. One gallon of fuel weighs 7 1/10 pounds. How many pounds of fuel are in a full tank? - What power 2

What power has a pump output to move 4853 hl of water to a height of 31 m for 8 hours? Comparing the power generated by the pump vs. the power generated by the motor, which is more efficient? Which pump or motor generates more pollution if, for every watt - Calculate 73134

The wooden prism weighs 5 kg and has a density of 700 kg/m³. Calculate the volume of the wooden prism. - Determine 69154

Determine the pump power if: I pour 3 m³ of water from the tank in 120 seconds with a hose. The height of the hose mouth above the tank is 1.5 m. The water's speed from the hose outlet is 20 m/s. - Determine 67764

The barrel filled with asphalt has a diameter of 60 cm and a height of 100 cm. The weight of the asphalt in it is 390 kg. Determine the density of the asphalt. - Container 67524

One milk container weighs 80g. What is the weight of a package of 12-liter milk cartons? - Calculate 66974

Calculate the density of the wood from which the statuette is made. Its volume is 32000 cm^{3}, and it weighs 20800 g. - Kilograms 66864

The sculptor composes an ice city from ice cubes. The cube with an edge length of 2 dm weighs 7.2 kg. How many kilograms is an ice cube with an edge length of 6 dm heavier than it? - Temperature 61484

The air bubble at the bottom of the lake at a depth of h = 21 m has a radius r1 = 1 cm at a temperature of t1 = 4 °C. The bubble rises slowly to the surface, and its volume increases. Calculate its radius when it reaches the lake's surface, with a tempera - Hydrogen 60813

One liter of air weighs 1,299 g and one liter of hydrogen 0.089 8 g. How many times is hydrogen lighter? Round the result to units. - Gravitational 54411

How much force do we lift a stone in the water that weighs 30 kg and has a density of 2500 kg / m³? Gravitational acceleration g = 10 m / s². - Dynamometer

What is the volume of a body that stretches a dynamometer in air, on which a force of 2.5 N suspends it, and if it is immersed in alcohol with a density of 800 kg/m³, does it tension the dynamometer with a force of 1.3 N? - Above water surface

If we remove the stone from the water, we apply a force of 120N. How much force will we exert if we move the stone above the water? The density of the stone is 5000 kg/m³. - There

There is 5 l of water with a temperature of 20°C in the bucket. We add 3 liters of hot water. The resulting temperature will be 30°C. What was the temperature of the hot water? - Measuring 46271

Calculate the weight of a block measuring 15 cm, 7.5 cm, and 10 cm made of a) oak wood (ρ = 800 kg/m³), b) spruce wood (ρ = 550 kg/m³). - Molecules 45441

The mean square velocity of the gas molecules is 1200 m/s. What pressure does this gas exert on the vessel wall when its density is 0.03 kg/m³? - Heat transfer

We placed a lead object weighing 0.4 kg and 250°C in 0.4 L water. What was the initial temperature of water t2 if the object's temperature and the water after reaching equilibrium was 35°C? We assume that the heat exchange occurred only between the lead o - Diameter 41221

How many shots with a diameter of 2 mm can a gunsmith cast from 1 kg of lead? The density of lead is 11.4 g / cm^{3} - Buoyancy 39891

The balloon filled with hot air has a volume of 1440m³. How large a buoyancy force acted on the balloon in the air with a density of 1.3 kg / m³? - Dimensions 39343

Determine the density of sheet glass with dimensions of 2m x 2m x 1dm weighing 500kg.

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