The loudness, \( L \), measured in decibels (Db), of a sound intensity, \( I \), measured in watts per square meter, is defined as \( L=10 \log \frac{i}{i_{0}} \), where \( l_{0}=10^{-12} \) and is the least intense sound a human ear can hear. What is the approximate loudness of a rock concert with a sound intensity of \( 10^{-1} \) ? 2 Db 22 Db 60 Db 110 Db

Describe a method to measure the density of a liquid.

22. Suppose your mass is 70.0 kg and your density is \( 970 \mathrm{~kg} / \mathrm{m}^{3} \). If you could stand on a scale in a vacuum chamber on Earth's surface, the reading of the scale would be \( m g=(170.0 \mathrm{~kg})\left(9.80 \mathrm{~N} / \mathrm{kg}^{2}\right)=686 \mathrm{~N} \). What \[ \begin{array}{l}\text { Unit } 3 \text { Fluid Mechanics } \\ \text { density } 1.29 \mathrm{~kg} / \mathrm{m}^{3} \text { ? (b) What will the scale read if you weigh yourself } \\ \text { in swimming pool with your body completely submerged? }\end{array} \]

12. How tall must a water-filled closed end manometer be to measure blood pressures as high as 300 mm Hg ?

The loudness, \( L \), measured in decibels (Db), of a sound intensity, \( I \), measured in watts per square meter, is defined as \( L=10 \log \frac{I}{I_{0}} \), where \( I_{0}=10^{-12} \) and is the least intense sound a human ear can hear. Jessica is listening to soft music at a sound intensity level of \( 10^{-9} \) on her computer while she does her homework. Braylee is completing her homework while listening to very loud music at a sound intensity level of \( 10^{-3} \) on her headphones. How many times louder is Braylee's music than Jessica's? \( \frac{1}{3} \) times louder 3 times louder 30 times louder 90 times louder

4. Write your answers on an A4 bond paper with a 0.5 in. border on all sides. 1. A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R If the entropy of the sink increase by 10 Btu/R, how much will the entropy of the source decrease? How much heat in Btu is transferred from the source?