Question

a）Pressure cookers have been around for more than 300 years, although their use has strongly declined in recent years (early models had a nasty habit of exploding). How much force (in N) must the latches holding the lid onto a pressure cooker be able to withstand if the circular lid is 22.0 cm in diameter and the gauge pressure inside is 2.70 atm? Neglect the weight of the lid.

N

b）A crass host pours the remnants of several bottles of wine into a jug after a party. He then inserts a cork with a 1.80 diameter into the bottle, placing it in direct contact with the wine. He is amazed when he pounds the cork into place and the bottom of the jug (with a 14.0 cm diameter) breaks away. Calculate the extra force (in N) exerted against the bottom if he pounded the cork with a 120 N force.

N

Answer 1