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## Homework Statement

A lid is put on a box that is 14 cm long, 12 cm wide, and 8.0 cm tall and the box is then evacuated until its inner pressure is 9.0 104 Pa.

How much force is required to lift the lid in Denver on a day when the atmospheric pressure is 67.5 kPa (2/3 the value at sea level)?

## The Attempt at a Solution

(67500-90000)*.o168

=-378 N

I Keep getting my answer wrong could someone help please