Unformatted text preview: he mouse needs a mechanical
advantage of 300,000:1. Problem: As shown, an air space above a long tube is pressurized to 50kPa vacuum.
Water (15°C) from a reservoir fills the tube to a height h. If the pressure in the air space is
changed to 25kPa vacuum, will h increase or decrease and by how much? Assume
atmospheric pressure is 100kPa.
Given: (a) From Table A.5 for water at 15°C, = 9800 N/m3
Equations and Assumptions:
(1) Multiple ways to solve this problem
(3) ∆ ∆ (alternate) Solution:
1000 100 0 9800 50 1000 9800 5.102
1000 100 0 9800 75 1000 9800 2.551
Change in height...
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- Fall '14
- Vapor pressure, pistons, table a.5