Question

O A U-shaped tube is closed at one end; the Po other end is open to the atmosphere. Water fills the side of the tube that includes the closed end, while oil, floating on the water, fills the side of the tube open to the atmosphere. The two liquids do not mix. O The density of oil is less than that of water Is the pressure at point A greater than, less than, or equal to the pressure p3? A. Greater than B. Less than C. Equal to

Answer 1

Since P_1 and P_2 are at same height in same liquid implies P_1 = P_2 implies P_1 - P_2 = 0 Now P_1 = P_A + e_0 gh P_2 = P_3 + e_w gh implies P_1 - P_2 = (P_A - P_3) + (e_0 - e_w) gh implies 0 = (P_A - P_3) + (P_0 - P_w) gh implies P_A - P_3 = (e_w - e_0) gh implies P_A - P_3 > 0 [because e_w > e_0] implies P_A > P_3 therefore pressure at point A is greater than from pressure P_3 correct option A) Greater than