Current Attempt in Progress Consider the freight train in Figure below. Suppose 21 boxcars pass by in a time of 15.8 s and each has a length of 12.0 m.(a) What is the frequency at which each boxcar passes? (b) What is the speed of the train? - The time. for one car to pass is the period 7 Velocity = V -Wavelength = à (a) Number i Units (b) Number Units

Each measurement we take has a level of uncertainty in it. The smaller the uncertainty, the larger the precision our measurement has. Let's revisit how one might go about estimating the uncertainty in a measurement. If we assume our instrument is properly calibrated and we are not introducing systematic error through improper techniques, then if we take enough measurements, the average of these measurements will be around the true value. The upper and lower bounds of these measurements would then give us one method for determining our measuring device's uncertainty. (This of course is only true for a large set of measurements, but the approximation is good enough for now to get us started). For example, say we perform last week's experiment of pulling a block at a constant velocity with a force sensor across another rough surface. We take the following five measurements: F, = {2.51 N, 2.53 N, 2.50 N, 2.54 N, 2.49 N} The average of this dataset is F, = 2.51 N Now we have the choice of…

Christian Huygens in the 1600’s invented the first clock which was small enough to fit in an ordinary room but much more accurate than the large tower clocks of his day. What was his big idea? Why does it work well on land but not at sea? (Ships would have to wait many years for an accurate on-board timepiece).

The distance travelled of a car is given by the values in the following table.Fill in the blanks to answer this question Time t (seconds) 1 4 Distance s (feet) 16 35 71 112 179 Find the car's average velocity for the following time intervals: Time interval [1,3] feet/ second Time interval [2,3] feet/second