O-LevelPhysicsForces5054/21 · Oct/Nov 2018 · Q25 Marks
A small crack appears in an oil tank and a stream of oil is pushed out through the crack. The oil hits the floor at P where a puddle of oil starts to form. Fig. 2.1 shows the oil tank. The gravitational field strength g is equal to 10N/kg. [Figure 2.1]
- (a)(i)The density of the oil is 940kg/m³ and the crack is 3.3 m below the surface of the oil. Calculate the pressure due to the oil at the level of the crack. pressure = [2]
- (a)(ii)Explain why the atmospheric pressure does not affect the rate at which the oil is pushed out through the crack.[1]
- (b)As time passes, the point where the oil hits the floor moves away from P and towards the tank. Explain why this happens.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [C1] (p =) p gh or 940 × 10 × 3.3
- [A1] 3.1 x 10⁴ Pa
- [B1] atmospheric pressure acts at both ends of crack
- [B1] (surface) level decreases / drops
- [B1] pressure (at level of crack) decreases
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