Chemistry, 14.11.2019 03:31 inesperezferrere
Abrick lies perilously close to the edge of the flat roof of a building. the roof edge is 50 ft above street level, and the brick has 370.0 j of potential energy with respect to street level. someone edges the brick off the roof, and it begins to fall. what is the brick's kinetic energy when it is 35 ft above street level?
Answers: 3
Chemistry, 21.06.2019 19:10
Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?
Answers: 1
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
Chemistry, 22.06.2019 14:30
The three types is stress that act on earths rocks are compression, tension, and
Answers: 1
Chemistry, 22.06.2019 17:00
Reduction is a reaction which results in a in electrons and a in positive charge of the atom or ion 1) a- loss 1) b- gain 2) a-increase 2) b-decrease
Answers: 1
Abrick lies perilously close to the edge of the flat roof of a building. the roof edge is 50 ft abov...
Biology, 02.04.2020 02:49
History, 02.04.2020 02:49
English, 02.04.2020 02:49
History, 02.04.2020 02:49
Mathematics, 02.04.2020 02:49
Mathematics, 02.04.2020 02:49
Biology, 02.04.2020 02:49
Physics, 02.04.2020 02:49
History, 02.04.2020 02:49
Chemistry, 02.04.2020 02:49