Question

Сердце взрослого человека за одно сокращение прогоняет около 160 см3 (куб.) крови. Оно сокращается примерно 70 раз в минуту, совершая работу 1 Дж за каждое сокращение. Какую работу совершает сердце за день?

Answer 1

День это 24 часа, то есть 24*60 = 1440 минут
За день сердце сделает 1440*70 = 100800 сокращений
Если каждое сокращение 1 Дж, то вся работа за день

100800Дж или 100.8 кДж

Answer 2

Calculating the Daily Work Done by the Heart

The heart of an adult human being pumps approximately 160 cm³ of blood with each contraction and contracts about 70 times per minute, performing 1 Joule of work for each contraction. To calculate the total work done by the heart in a day, we can use the following formula:

Total work = (Volume of blood pumped per contraction) × (Number of contractions per minute) × (Work done per contraction) × (Number of minutes in a day)

Using the given values: - Volume of blood pumped per contraction = 160 cm³ - Number of contractions per minute = 70 - Work done per contraction = 1 Joule - Number of minutes in a day = 24 hours × 60 minutes/hour = 1440 minutes

We can calculate the total work done by the heart in a day using the above formula.

Calculation

Total work = 160 cm³/contraction × 70 contractions/minute × 1 Joule/contraction × 1440 minutes/day

Total work = 160 × 70 × 1 × 1440 = 16,128,000 Joules/day

Therefore, the heart of an adult human being performs approximately 16,128,000 Joules of work in a day.