Question

Спортсмен поднимает гирю массой 16 кг на высоту 2 м, затрачивая на это 0,8 с. Какую мощность при этом развивает спортсмен?

Answer 1

N=m*g*h/t=16*2/0,8=40 Вт

Answer 2

Calculating the Power Developed by the Athlete

To calculate the power developed by the athlete when lifting a 16 kg weight to a height of 2 m in 0.8 s, we can use the formula for power:

Power (P) = Work / Time

Where: - Work = Force × Distance - Force = Weight (mass × acceleration due to gravity) - Distance = Height lifted

First, let's calculate the work done by the athlete.

Calculating Work

The work done by the athlete can be calculated using the formula: Work = Force × Distance

Given: - Mass (m) = 16 kg - Acceleration due to gravity (g) = 9.81 m/s^2 (standard value)

The force exerted by the athlete can be calculated as: Force = Mass × Acceleration due to gravity

Let's calculate the force: ``` Force = 16 kg × 9.81 m/s^2 ``` This gives us the force exerted by the athlete.

Calculating Distance

The distance lifted by the athlete is given as 2 m.

Calculating Work

Now, we can calculate the work done by the athlete: ``` Work = Force × Distance ``` This will give us the work done by the athlete.

Calculating Power

Finally, we can calculate the power developed by the athlete using the formula: Power (P) = Work / Time

Given: - Time (t) = 0.8 s

We can now calculate the power developed by the athlete.

Conclusion

By using the above calculations, we can determine the power developed by the athlete when lifting a 16 kg weight to a height of 2 m in 0.8 s.