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I have a length of string and I want to know the maximum tension the string can support. I tie one end of the string to the ceiling and the other end to a glass of mass 100 g. The glass is cylindrical, with a cross-sectional radius of 4 cm and a height of 15 cm. I fill the glass with water (density of 1 g/cm3) and discover that the string breaks when the glass is 2/3 full. What is the maximum tension in N the string can support?

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closed as too localized by John Rennie, Waffle's Crazy Peanut, Manishearth Apr 17 '13 at 10:08

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Calculate the volume of the water in the glass, and from this its mass. Add the mass of the glass, multiply by the acceleration due to gravity to get the force, and this is your answer. – John Rennie Apr 17 '13 at 9:22
can you show it with mathematical way please – leava-wing Apr 17 '13 at 9:41
Welcome to Physics! Please see our homework policy. We expect homework problems to have some effort put into them, and deal with conceptual issues. If you edit your question to explain (1) What you have tried, (2) the concept you have trouble with, and (3) your level of understanding, I'll be happy to reopen this. (Flag this message for ♦ attention with a custom message, or reply to me in the comments with @Manishearth to notify me) – Manishearth Apr 17 '13 at 10:07