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q.21 :Q- 18, 21, 25, 30-how can da ans is C..shudnt it b A or B??
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w06_qp_1.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w06_ms_1.pdf
pressure due to oil = 830* 9.81*x
pressure due to water = 1000*9.81*(2000-x)
so now the equation is ,
17.5x10^6 = (830*9.81*x) + (1000*9.81*(2000-x)
solve it and u get the ans 1270 (D)