S = 1.2 m2.
g = 10 N / m.
P = 35 kPa = 35 * 10 ^ 3 Pa.
The tractor pressure on the soil P is determined by the formula: P = F / S, where F is the force with which the tractor presses on the soil, S is the area of contact of the tractor with the soil.
The tractor presses on the soil by the force of its weight, the value of which is expressed by the formula: F = m * g, where m is the mass of the tractor, g is the acceleration of gravity.
P = m * g / S.
We find the mass of the tractor by the formula: m = P * S / g.
m = 35 * 10 ^ 3 Pa * 1.2 m2 / 10 N / m = 4.2 * 10 ^ 3 kg = 4.2 t.
Answer: the mass of the tractor is m = 4.2 tons.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.