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Chapter 1: Q22PE (page 11)
What is the area of a circle 3.102 cmin diameter?
The area of the circle is or .
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How many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human? (Hint: The lifetime of an unstable atomic nucleus is on the order of 10-22s
(a) How far apart are two layers of tissue that produce echoes having round-trip times (used to measure distances) that differ by \[{\rm{0}}{\rm{.750 \mu s}}\]? (b) What minimum frequency must the ultrasound have to see the detail of this small?
An infant’s pulse rate is measured to be . What is the percent uncertainty in this measurement?
An infant’s pulse rate is measured to be. What is the percent uncertainty in this measurement?
(a) A woman climbing the Washington Monument metabolizes \[6.00 \times {10^2}{\rm{ }}kJ\] of food energy. If her efficiency is \({\bf{18}}{\bf{.0\% }}\) , how much heat transfer occurs to the environment to keep her temperature constant? (b) Discuss the amount of heat transfer found in (a). Is it consistent with the fact that you quickly warm up when exercising?
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