Expert Physics Tutoring

MS1:

- Density is the mass of a substance per unit volume (1)

- Unit is kilograms per cubic metre (kg/m³ ) (1)

MS2:

- Buoyancy force acts upwards (1)

- Weight force acts downwards (1)

- Object floats when buoyancy force is greater than weight force (1)

MS3:

- Volume = length x width x height = 750cm³ (1)

- Density = mass / volume = 500g / 750cm³ (1)

- Density = 0.67 kg/cm³ (1)

MS4:

- Weight is directly proportional to density (1)

- Greater density means greater weight (1)

MS5:

- Buoyancy force = weight force (1)

- Buoyancy force = density of water x volume submerged (1)

- Weight force = density of boat x volume total (1)

- Density of boat = density of water x 2/5 (1)

- Density of boat = 800kg/m³ (1)

MS6:

- Buoyancy force = weight force (1)

- Buoyancy force = density of oil x volume submerged (1)

- Weight force = density of wood x volume total (1)

- Fraction submerged = density of wood / density of oil (1)

- Fraction submerged = 0.5g/cm³ / 0.8g/cm³ (1)

- Fraction submerged = 5/8 (1)

MS7:

- Cubic metre (m³) (1)

MS8:

- Air inside balloon is heated (1)

- Heated air is less dense than surrounding air (1)

- Buoyancy force on balloon is greater than weight force (1)

MS9:

- Volume = (4/3)π x 4³ = 268.08cm³ (1)

- Mass = density x volume = 2.5g/cm³ x 268.08cm³ (1)

- Mass = 670.2g (1)

MS10:

- Volume = difference between volumes of outer and inner cylinders (1)

- Volume = (π x 5² x 10) - (π x 3² x 10) (1)

- Volume = 314.16cm³ (1)