Physics · Oct / Nov 2020 · Paper 41 · Question 3
0625
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The question as text
A U-shaped tube of constant cross-sectional area contains water of density 1000 kg / m3. Both sides of the U-tube are open to the atmosphere. Fig. 3.1 shows that the water levels in the two sides of the tube are equal. stopper 0.200 m rubber tubing connected to gas supply Fig. 3.1 Fig. 3.2 The atmospheric pressure is 1.00 × 105 Pa. The left-hand side of the tube is now connected to a gas supply using a length of rubber tubing. This causes the level of the water in the left-hand side of the tube to drop by 0.200 m, as shown in Fig. 3.2.
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3(a)[3]
(pliq =) hρg (in any form) or 0.400 × 1000 × 10 or 2000 or 4000 or 1.02 × 105 (Pa)
(p =) patm + hρg (in any form) or 1.00 × 105 + 0.400 × 1000 × 10 or 4000 or 1.02 × 105 (Pa)
1.04 × 105 Pa
3(b)(i)[2]
(F =) pA (in any form) or 4000 × 0.025
100 N
3(b)(ii)[2]
(W.D. =) F × x (in any form) or 1.04 × 105 × 0.025 × 0.50 or 4000 × 0.025 × 0.50 or 50 (J)
1300 J
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