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Chapter 1: Q14PE (page 11)
An infant鈥檚 pulse rate is measured to be. What is the percent uncertainty in this measurement?
The percentage uncertainty in the given case is 3.846%.
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Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten times the mass of a hydrogen atom. (Hint: The mass of a hydrogen atom is on the order of 10-27kg and the mass of a bacterium is on the order of 10-15kg.)
The length and width of a rectangular room are measured to be\({\bf{3}}.{\bf{955}}{\rm{ }} \pm {\rm{ }}{\bf{0}}.{\bf{005m}}\)and \({\bf{3}}.{\bf{050}}{\rm{ }} \pm {\rm{ }}{\bf{0}}.{\bf{005m}}\). Calculate the area of the room and its uncertainty in square meters.
A short circuit in a\(120{\rm{ }}V\) appliance cord has a \(0.500{\rm{ }}\Omega \) resistance. Calculate the temperature rise of the \(2.00{\rm{ }}g\) of surrounding materials, assuming their specific heat capacity is and that it takes \(0.0500{\rm{ }}s\) for a circuit breaker to interrupt the current. Is this likely to be damaging?
(a) Suppose that a person has an average heart rate of beats/ min. How many beats does he or she have in 2.0 y ? (b) In 2.00 y ? (c) In 2.000 y ?
(a) How many significant figures are in the numbers 99and 100? (b) If the uncertainty in each number is 1, what is the percent uncertainty in each? (c) Which is a more meaningful way to express the accuracy of these two numbers, significant figures or percent uncertainties?
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