Physics, 12.07.2019 02:00 jerseygirl3467
Asealed pressure cooker allows steam to escape only through an opening in the lid. a separate metal object, called a petcock, sits on top of the opening and prevents steam from leaving until the pressure within the cooker overcomes the weight of the petcock. the petcock and the periodic escape of steam prevents the dangerous buildup of pressure and keeps the pressure inside the cooker above atmospheric pressure. determine the mass of the petcock of a pressure cooker whose operational pressure is 100 kpa gage and has a round opening 4 mm in diameter. assume atmospheric pressure is 101 kpa.
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Physics, 22.06.2019 19:30, diyagawande
Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.
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