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Worksheet: Measurement Uncertainties

Q1:

Suppose your bathroom scale reads your mass as 65 kg with a uncertainty. What is the uncertainty in your mass (in kilograms)?

Q2:

What is the percent error of thinking the melting point of tungsten is instead of the correct value of K?

Q3:

A marathon runner completes a 42.188-km course in 2 h, 30 min, and 12 s. There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time.

Calculate the percent uncertainty in the distance.

Calculate the percent uncertainty in the elapsed time.

What is the average speed in meters per second?

What is the uncertainty in the average speed?

Q4:

A car engine moves a piston with a circular crosssection of cm in diameter a distance of cm to compress the gas in the cylinder.

By what amount is the gas decreased in volume in cubic centimeters?

Find the uncertainty in the decrease in the volume of the gas when the gas is compressed.

Q5:

An infant’s pulse rate is measured to be beats/min. What is the percent uncertainty in this measurement?

  • A
  • B
  • C
  • D
  • E

Q6:

A good-quality measuring tape can make an error in length measurement of 0.40 cm when measuring a distance of 24 m. What is its percent uncertainty?

Q7:

A car speedometer has a uncertainty.

What is the range of possible speeds when the speedometer reads 85 km/h?

  • A km/h
  • B km/h
  • C km/h
  • D km/h
  • E km/h

What is the possible range of speeds when the speedometer reads 85 km/h, stating this speed range in miles per hour, where 1 km = 0.6214 mi.

  • A mph
  • B mph
  • C mph
  • D mph
  • E mph