Abrick lies perilously close to the edge of the flat roof of a building. the roof edge is 50 ft about street level and the brick has 320.0 j of potential energy with respect to street level. what is the bricks kinetic energy the instant before it hits the street surface?
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Chemistry, 22.06.2019 08:30
Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?
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Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Abrick lies perilously close to the edge of the flat roof of a building. the roof edge is 50 ft abou...
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