Physics · May / June 2022 · Paper 41 · Question 2
0625
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The question as text
Fig. 2.1 shows water stored in a reservoir behind a hydroelectric dam. generator turbine reservoir 150 m Fig. 2.1 (not to scale)
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2(a)[1]
gravitational potential energy
2(b)(i)[3]
1.6 × 106 Pa
(p =) h g (in any form) or 150 × 1000 × 10 or 1.5 × 106
C1 1.5 × 106 or 1.0 × 105 + {150 × 1000 × 10} or 1.0 × 105 + 1.5 × 106
C1 or 1.6 × 10N
2(b)(ii)[2]
5.6 × 106 N
(F =) pA (in any form) or 1.6 × 106 × 3.5
C1
2(c)[2]
speed (of water) remains constant
otherwise density would decrease or gaps would appear in the water
or volume / density does not change or liquids incompressible or water enters / leaves at constant rate or quantity of water remains constant
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