An iron rod of length 100 m at 10°C is used to measure a distance of 2km on a day when the temperature is 40°C. Calculate the error in measuring the distance. (linear expansivity of iron = 1.2x10-⁵/°C)

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.