Question

Чему ровна работа силы тяжести для тела массой 200г при падении его высоты с 20 м до 5 м над землей

Answer 1

A=F*H

H=20м-5м=15м

A=15*0.2=7.5Дж

Ответ: А=7,5Дж

 

Answer 2

Calculation of the Work Done by the Force of Gravity

To calculate the work done by the force of gravity on an object, we need to determine the change in height and the mass of the object. In this case, we have a body with a mass of 200g (0.2kg) that falls from a height of 20m to a height of 5m above the ground.

The work done by the force of gravity can be calculated using the formula:

Work = Force x Distance

In this case, the force is the weight of the object, which is given by:

Force = mass x acceleration due to gravity

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

Let's calculate the work done by the force of gravity step by step:

1. Calculate the force:

Force = mass x acceleration due to gravity Force = 0.2kg x 9.8 m/s^2

2. Calculate the change in height:

Change in height = initial height - final height Change in height = 20m - 5m

3. Calculate the work done:

Work = Force x Distance Work = (0.2kg x 9.8 m/s^2) x (20m - 5m)

Now, let's calculate the numerical value of the work done by the force of gravity.

Using the given values:

- Mass (m) = 0.2kg - Acceleration due to gravity (g) = 9.8 m/s^2 - Initial height (h0) = 20m - Final height (h) = 5m

We can substitute these values into the equation:

Work = (0.2kg x 9.8 m/s^2) x (20m - 5m)

Calculating the numerical value:

Work = (0.2kg x 9.8 m/s^2) x (15m)

Work = 2.94 Joules

Therefore, the work done by the force of gravity on the object with a mass of 200g, falling from a height of 20m to a height of 5m above the ground, is 2.94 Joules.