Question

Человек массой 70кг равномерно поднялся за 16 с по лестнице на высоту 8 м. Какую работу совершил человек? Дам 40 баллов!!

Answer 1

Ответ:

5600 Дж

Объяснение:

A= F*h следовательно A= mgh A=70*10*8=5600Дж

Мощность на всякий случай тоже

N= A/t следовательно N= mgh/t

N= 70*10*8/16= 5600/16= 350

Answer 2

Calculation of Work Done

To calculate the work done by a person, we can use the formula:

Work = Force × Distance

In this case, the force exerted by the person is equal to their weight, which can be calculated using the formula:

Weight = mass × acceleration due to gravity

Given that the mass of the person is 70 kg, we can calculate their weight as follows:

Weight = 70 kg × 9.8 m/s^2 (acceleration due to gravity)

Calculating the weight:

Weight = 686 N

The distance traveled by the person is 8 m, and the time taken is 16 s.

Using the formula for work, we can calculate the work done by the person:

Work = Force × Distance

Substituting the values:

Work = 686 N × 8 m

Calculating the work:

Work = 5488 Joules

Therefore, the person has done 5488 Joules of work while climbing the stairs.