Expert Physics Tutoring

MS1

- Atmospheric pressure is the force exerted by the weight of air molecules above a given point (1)

- Unit is Pascals (Pa) (1)

MS2

- Weight of water above diver increases with depth (1)

- Pressure increases with depth (1)

MS3

- Pressure = Force / Area (1)

- Substitutes values correctly: 200 / 0.5 (1)

- Final answer: 400 Pa (1)

MS4

- Volume of balloon increases (1)

- Pressure inside balloon decreases (1)

MS5

- Uses Boyle's Law: P₁V₁ = P₂V₂ (1)

- Substitutes values: 2.5kPa × 2.0m³ = P₂ × 1.5m³ (1)

- Final answer: 3.33kPa (1)

MS6

- Example: Drawing water from a straw (1)

- Air pressure outside straw is greater than air pressure inside straw (1)

MS7

- Mercury (or liquid) in the barometer is pushed down by air pressure (1)

- Height of mercury column is proportional to air pressure (1)

MS8

- Pascal is the pressure exerted by a force of one newton acting on an area of one square metre (1)

MS9

- Pressure difference = ρgh (1)

- Substitutes values: 1000kg/m³ × 9.81m/s² × 20m (1)

- Final answer: 196.2kPa (1)

MS10

- Air pump increases volume of tyre (1)

- According to Boyle's Law, pressure decreases as volume increases (1)

- Inside pressure becomes greater than outside pressure (1)

- Air flows into tyre until pressures equalise (1)