Atmospheric pressure. Archimedes’ law
Answers are for parents and teachers.
1
Starting at 760 mmHg and climbing 480 m, about what is the pressure in mmHg (1 mmHg per 12 m)?
720
2
A 4 dm³ body is fully in water. Buoyant force in N (ρ = 1000 kg/m³, g = 10 N/kg)?
40
3
A body weighs 25 N in air and 15 N in water. Buoyant force in N?
10
4
Why can liquid be drunk through a straw? Explain using atmospheric pressure.
Sucking air out lowers the pressure in the straw, and outside atmospheric pressure pushes the liquid up.
5
An ice cube floats. About what percent of it is under water (900 : 1000)?
90