Question

Какую работу совершил подъёмный кран, подняв стальную балку размерами 5м х 0.5м х 0.5м на высоту 10м. Плотность стали 7800 кг/м³.

Answer 1

V=abc

V=0,5*0,5*5=1,25

m=pv

m=7800*1,25=9750

f=mg

f=9750*10=97500

A=f*h

A=97500*10=975000дж=975кДж

Answer 2

Calculation of the Weight of the Steel Beam

To determine the work done by the crane in lifting the steel beam, we first need to calculate the weight of the beam. The weight of an object can be calculated using the formula:

Weight = Volume x Density x Gravity

In this case, the volume of the steel beam is given by its dimensions: 5m x 0.5m x 0.5m. The density of steel is given as 7800 kg/m³, and the acceleration due to gravity is approximately 9.8 m/s².

Using the formula, we can calculate the weight of the steel beam:

Weight = (5m x 0.5m x 0.5m) x 7800 kg/m³ x 9.8 m/s²

Calculating this expression gives us the weight of the steel beam.

Calculation of the Work Done by the Crane

The work done by the crane in lifting the steel beam is given by the formula:

Work = Force x Distance

In this case, the force is equal to the weight of the steel beam, and the distance is the height to which the beam is lifted.

Using the weight of the steel beam calculated earlier, we can now calculate the work done by the crane:

Work = Weight x Height

Substituting the values, we have:

Work = (Weight of the steel beam) x 10m

Calculating this expression gives us the work done by the crane in lifting the steel beam.

Answer:

The work done by the crane in lifting the steel beam with dimensions 5m x 0.5m x 0.5m to a height of 10m can be calculated using the formulas mentioned above. The weight of the steel beam is calculated to be:

Weight = (5m x 0.5m x 0.5m) x 7800 kg/m³ x 9.8 m/s²

After calculating the weight, we can calculate the work done by the crane:

Work = (Weight of the steel beam) x 10m

Please note that the exact numerical value of the weight and work done will depend on the specific calculations.