Question

Человек, масса которого 70 кг, держит на плечах ящик массой 20 кг. С какой силой человек давит на землю? Пожалуйста и спасибо!!!

Answer 1

Сила тяжести = m*g
Сила тяжести = (70кг+20кг) * 10 Н\кг
Сила тяжести = 90 кг * 10 Н\кг = 900 Н

Answer 2

Calculation of the Force Exerted by a Person

To calculate the force exerted by a person holding a box on their shoulders, we need to consider the weight of the person and the weight of the box.

Given: - Mass of the person = 70 kg - Mass of the box = 20 kg

To find the force exerted by the person on the ground, we need to consider the force due to gravity acting on both the person and the box.

The force due to gravity can be calculated using the formula:

Force = mass x acceleration due to gravity

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

Let's calculate the force exerted by the person:

1. Calculate the force due to gravity acting on the person: - Mass of the person = 70 kg - Acceleration due to gravity = 9.8 m/s^2 - Force = mass x acceleration due to gravity - Force exerted by the person = 70 kg x 9.8 m/s^2

2. Calculate the force due to gravity acting on the box: - Mass of the box = 20 kg - Acceleration due to gravity = 9.8 m/s^2 - Force = mass x acceleration due to gravity - Force exerted by the box = 20 kg x 9.8 m/s^2

3. Calculate the total force exerted by the person on the ground: - Total force exerted = Force exerted by the person + Force exerted by the box

Let's calculate the values:

1. Force exerted by the person: - Mass of the person = 70 kg - Acceleration due to gravity = 9.8 m/s^2 - Force exerted by the person = 70 kg x 9.8 m/s^2 = 686 N.

2. Force exerted by the box: - Mass of the box = 20 kg - Acceleration due to gravity = 9.8 m/s^2 - Force exerted by the box = 20 kg x 9.8 m/s^2 = 196 N.

3. Total force exerted by the person on the ground: - Total force exerted = Force exerted by the person + Force exerted by the box - Total force exerted = 686 N + 196 N = 882 N.

Therefore, the person exerts a force of 882 N on the ground while holding a box with a mass of 20 kg on their shoulders.

I hope this helps! Let me know if you have any further questions.