University physics 1

purposes, let's just call A the "rms\" for short. It turns out that when the distribution looks sort of bell-shaped, about 68% of the data fall between do A and do + A , Also about 95% of the data fall between do 2A and do +2A . So, the point of the rms (or in other words A) is that it measures how spread out the distribution is. For the following (short!) list of pebble sizes, nd the mean value and the rrns (Sizes d in mm) 1 5.846 2 10.057 3 4.98 4. 7.104 5. 7.856 6. 9.392 7 5.927 8 12.301 9 10.159 10 9.507 11 3.442 12. 3.476 (f) Compose two sentences to give the practical meaning (more than a denition) of the mean value and the rms of some data. In other words. what does each of these two statistics actually tell you about the data? 2. The next problem also has to do with muttiple measurements. It has to do with time measurements rather than diameter measurements, but the ideas are the same. From your reading. write down formulas for the distance traveled and for the velocity, each as a function of time, in terms of initial speed and the acceleration a, assuming the acceleration is constant. This situation applies to a failing object or a car skidding to a stop. \\. 3. In an experiment, a driver driving along at 15 miles per hour (22 /sec) is given without waning a srgnal to apply the breaks. Tests show that the reaction timethat is the time from the signal to when