A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm³, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then: A)2.25 cm B)8 cm C)6 cm D)4 cm E)need to know the cross-sectional area of the U-tube

Question

Quizplus · Accepted Answer

The pressure at the bottom of both arms must be equal. The height of the water column is 3 cm, and the density of oil is 0.75 times that of water. Therefore, the height of the oil column must be 3 cm / 0.75 = 4 cm. Since the water level rises by 3 cm, the total length of the oil column is 4 cm + 4 cm = 8 cm.

A Uniform U-Tube Is Partially Filled with Water