Ch. Ex. 6a - A lid is put on a box that is 15 cm long, 13 cm wide, and 8.0 cm ta

Question

Ch. Ex. 6a - A lid is put on a box that is 15 cm long, 13 cm wide, and 8.0 cm tal 1 out of 7 attempts A lid is put on a box that is 18 cm long, 15 cm wide, and 5.8 cm tall and the box is then Assistance Check My Work View Hint View Question Show Me Guided Solution Practice This Question Print Question Help Report a Problem evacuated until its inner pressure is 0.91 × 10, Pa. How much force is required to lift the lid (a) at sea level; (b) on a mountain where the atmospheric pressure is 70.4 kPa?

Explanation / Answer

a) Atmosphering pressure at sea level is 101325 Pa. The lid's surface area's 0.17*0.15 m2, which is 0.02554 m2, so the force on the the lid is:
F= Pressure * Area= ( 101325 - 91000 )Pa * 0.0255m2 = 263.29 N

b) The pressure at mountain is given as: 70.4 * 103 Pa. So, this will act as internal pressure
Force is given as:
( 91000 - 70400 )Pa * 0.0255m2 = 525.3 N

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