# Energy - practice problems

#### Number of problems found: 127

- 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, the pump or the motor generates the more pollution if fo - Which 10

Which will have greater momentum between a 10 wheeler truck weighing 7,000 kg and a bus that weighs 5,000kg if the bus is moving at 15 m/s while the truck is moving at 10 m/s? - Calculate 71684

Calculate the mass of water that gave off 520.5 kJ of heat when cooled from 69 ° C to 27 ° C. - Increases 69454

The car weighs 1850 kg and increases its speed from 27 to 81 km / h. How much has its kinetic energy increased? - 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 speed of the water from the mouth of the hose is 20 m / s. - Increasing 69094

The aircraft weighing 61 t climbed from a height of 1000 m to a height of 3000 m while increasing the speed from 170 m / s to 210 m / s. What work did the aircraft engines do? - Transfers 67414

At the height of 80 cm above the road, a person transfers a stone weighing 2 kg parallel to it in a uniform motion along a path of 6 m in 10 s. With what power does it work? - Fuel efficiency

The gravimetric analysis of an anthracite fuel is 90% carbon, 3% hydrogen, 2% oxygen, 1% nitrogen. Given that analysis of the dry combustion products, by volume, is 16.2% CO2, 3.5% O2, 80.3% N2, during the combustion process of an anthracite which conside - Power consumption

The price of electricity is ₱6.50 per kilowatt hour (kWh). If a television with 120 W power consumption ran from 7:30 AM to 12:30 PM, how much electricity was consumed? How much will this cost? - Gas prices 2021

According to the SPP price list in 2021, the price of natural gas together with its supply is as follows: D1 - we cook. Fix 3.34 euros/month and 0.0479 euros/kWh (1 cubic meter of gas is approximately 10.555 kWh. It is called combustion heat and changes o - Ice to boiling water

Calculate the heat needed to convert 5kg of ice with a temperature of -5°C to water with a temperature of 100°C. c (water) = 4200 J. Kg-1. kg-1, c (ice) = 2100 J. Kg-1. kg-1. the mass group heat of solidification of water is l = 334kJ/kg. Calculate the he - Lead melt

Find the heat needed to melt an object made of lead weighing 250g and an initial temperature of 35°C. Lead melts at 327°C at normal pressure. Mass heat capacity of lead c = 129 J/kg • K and mass latent heat of lead lt (t is the subscript) = 22.6 kJ/kg - What power

What power should the radiator have in a room 5x4 meters with a height of 3 meters? Hint: Calculate 35 watts per meter³ in case you need 22 degrees in the room but you need about 24 degrees in the bathroom. It's an old heating cheat, but it will definitel - 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? - Thermometer

Immerse a thermometer with a heat capacity of 2.0 J. K-1 in water weighing 67.0 grams. Before immersion in water, the thermometer showed a temperature of 17.8 degrees Celsius. After reaching equilibrium, the temperature is 32.4 degrees. What was the water - Flatbed 47151

How many bricks do they have to lift on a 1.2 m high flatbed if I want to do the work 5.88kj and one brick weighs 5 kg? - Latent heat

How much heat is needed to take from 100 g of water at 20°C to cool to ice at -18°C? Mass heat capacity c (ice) = 21kJ/kg / °C; c (water) = 4.19 KJ/kg / °C and the mass group heat of solidification of water is l = 334kJ/kg - Cylindrical 46021

Calculate the magnetic field energy of a cylindrical coil with 400 turns, a length of 0.4 m, and a radius of 20 mm. A current of 3A passes through the coil. (µo = 4π 10-7 H. M-1) - Electrical 44931

A current of 20 A passes through the heating spiral of the electric fireplace with a resistance of 10Ω for 2.5 hours. Determine the power input of the fireplace and the consumed electrical energy - Transmission 44701

The electric field performs work 1610 J in the transmission of el. 7 C hubs between the heating coil terminals. Calculate the voltage between the terminals.

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