For each of the following, estimate the difference between the speeds of the particle when it is in the first excited state and when it is in the lowest-energy state: (i) an electron confined by an infinite square-well potential whose width is roughly to the radius of an atom (about 10-10 m); (ii) a tennis ball confined by an infinite square-well potential whose width is equal to the width of a tennis court. What do your answers tell you about the mechanics of microscopic and macroscopic systems

How do scientists think that gravity affected the formation of our solar system?

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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.)