Question

Тело массой 100 кг упало с высоты 10 м на крышу дома, высота которого 3 м .Какова работа, совершенная силой тяжести? Должно получиться 6,86 кДж.

Answer 1

E=m*g*(h1-h2)=100*9,8*(10-3)=6860 Дж=6,68 кДж

Answer 2

Calculation of Work Done by the Force of Gravity

To calculate the work done by the force of gravity when a body of mass 100 kg falls from a height of 10 m onto a roof with a height of 3 m, we can use the formula:

Work = Force × Distance

The force of gravity can be calculated using the formula:

Force = mass × acceleration due to gravity

Acceleration due to gravity is approximately 9.8 m/s^2.

Let's calculate the force of gravity first:

Force = 100 kg × 9.8 m/s^2 = 980 N.

The distance over which the force of gravity acts is the difference in height between the initial position and the final position of the body:

Distance = 10 m - 3 m = 7 m.

Now, we can calculate the work done by the force of gravity:

Work = Force × Distance = 980 N × 7 m = 6860 J.

Converting the work from joules to kilojoules:

Work = 6860 J = 6.86 kJ.

Therefore, the work done by the force of gravity is approximately 6.86 kJ.

Please note that the calculated value of 6.86 kJ may differ slightly from the given value of 6.86 kJ due to rounding errors or variations in the values used for calculations.

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