By using the instruments from the task 1 you have determined

By using the instruments from the task 1, you have determined that it takes 3 s for a toy car to travel through the distance of 162 cm. What are the relative uncertainties of the distance and time measurements? Which measurement is the least uncertain? Calculate the average speed of the toy car. Decide whether you can use the weakest link rule to determine the relative uncertainty in speed estimation. Determine the range of possible values for the actual average speed of the car.

Solution

3. Relative uncertainity for distance = 1/1620

Relative uncertainity for time = 1/3

Distance less uncertain\'

4. speed =1.62/3 =0.54m/s

Uncertainitty (dv/v =dl/l+dt/t) = 0.333+1/1620 = 0.333 approx

Range = 0.21 m/s to 0.87m/s