1. Why, when building a house, all its walls are laid at the same height at the same time? 2. Why do trucks have two wheels on the rear axle and one on the right?
3. The airframes are airtight, what would happen if a hole appeared in the airplane at an altitude of 10 km?
4. The volume of the concrete column is 5 m³ and the cross-sectional area is 1.6 m². What is the ground pressure of this column? Concrete density 2200 kg / m³.
5. Water is added to one branch of the contact containers and glycerol to the other. The height of the glycerol column is 20 cm. What is the height of the water column? Water density 1000 kg / m³, glycerol - 1200 kg / m³.
6. The small piston of the hydraulic press with an area of 20 cm² is subjected to a force of 200 N and has lowered by 50 cm. What force acts on a large piston with an area of 0.01 m² and to what height did it rise?
7. The atmosphere acts on the table surface with a force of 105 kN. Atmospheric pressure 750 mmHg. What is the surface area of the table? The density of mercury is 13600 kg / m³.
8. At the foot of the mountain the barometer reads 98,642 kPa and at its top 90137 Pa. Based on this data, find the height of the mountain. Air density 1.29 kg / m³.