(a) If your speedometer has an uncertainty of 2.0km/h2.0km/h at a speed of 90km/h90km/h , what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60km/h60km/h , what is the range of speeds you could be going?

(a) A car speedometer has a 5.0%5.0% uncertainty. What is the range of possible speeds when it reads 90km/h90km/h ? (b) Convert this range to miles per hour. (1 km=0.6214 mi)

. (a) A person's blood pressure is measured to be 120 ± 2 mm Hg120 ± 2 mm Hg . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg?

A marathon runner completes a 42.188km42.188km course in 2h2h , 30 min, and 12s12s . There is an uncertainty of 25m25m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?

The kinetic energy of a body is determined from measurements of its momentum p and its mass m.The percentage uncertainties in the measurements are:p± 3%m±4%What is the percentage uncertainty in the kinetic energy?A. 7%B. 10%C. 13%D. 14%

An atom of tungsten has a radius of 193. pm and the average orbital speed of the electrons in it is about ×1.6108/ms.Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of tungsten. Write your answer as a percentage of the average speed, and round it to 2 significant digits.%