8/7/2020Answer Key Chapter 1 - University Physics Volume 1 | OpenStax1/3Check Your Understanding1.1Mg or 479 Mg1.21.31.4The numbers were too small, by a factor of 4.45.1.51.6yes1.7or 30 km. It is probably an underestimate because the density of the atmospheredecreases with altitude. (In fact, 30 km does not even get us out of the stratosphere.)1.8No, the coach’s new stopwatch will not be helpful. The uncertainty in the stopwatch is too great todifferentiate between the sprint times effectively.Conceptual Questions1. Physics is the science concerned with describing the interactions of energy, matter, space, and time touncover the fundamental mechanisms that underlie every phenomenon.3. No, neither of these two theories is more valid than the other. Experimentation is the ultimate decider. Ifexperimental evidence does not suggest one theory over the other, then both are equally valid. A givenphysicist might prefer one theory over another on the grounds that one seems more simple, more natural,
