Homework 6 - Irish, Emmaleigh
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School
California State University, Fullerton *
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Course
301
Subject
English
Date
Apr 3, 2024
Type
Pages
1
Uploaded by msemmaleighirish
Emmaleigh Irish PHYS 301 Professor Cadena Homework 6 1. How can you increase the pressure exerted by this book on a tabletop without increasing its weight? When an object exerts force on a surface, the force applied and the area over which force is distributed determines the pressure. If you were to increase the pressure exerted without increasing its weight, you would need to decrease the area over which the force is distributed. By reducing the surface area in contact with the tabletop, the pressure exerted can be increased. 8. Why is a dam constructed with a very broad base, as shown in Figure 8.28 (page 272)? A dam is constructed with a very broad base in order to decrease pressure on the structure of the dam. By increasing the area over which force is distributed, there is a decrease in pressure that stabilizes the structural integrity of the dam. 13. What are the effects of the Clean Air Act on the use of coal for electric generating plants? Check the Web. - preventing about 90% of the mercury in coal burned in power plants from being emitted into the air - reducing 88% of acid gas emissions from power plants - reducing 41% of sulfur dioxide emission from power plants beyond the reductions expected from the Cross State Air Pollution Rule. 27. Calculate the pressure exerted on your finger if you hold up a 15-lb box of apples. P = w/a A = (1.0cm
2
)(1.0m/100cm)
2
= 1.0 x 10
-4
m
2
M = (15lb)(0.4535kg/1.0lb) = 6.8039kg P = (6.8039kg)(9.80 m/s
2
)/(1.0 x 10
-4
m
2
) = 6.7 x 10
5
= amount of pressure exerted 28. What is the pressure exerted by your finger if you hold back water leaking through a hole in a dike, as shown in Figure 8.29? P = pgh H = (1.0ft)(0.3048m/1.0ft) = 0.3048m P = (1000kg/m
3
)(9.80m/s
2
)(0.3048m) = 2.99 x 10
3
= amount of pressure exerted 33. A 1000-MWe plant uses coal with 3% sulfur content. How many tons of SO
2
will be emitted into the air during the operation of the plant for a day? (Use the list of conversions and equivalences located on the inside of the back cover.) M = (3%) (9000 ton/day) = 270 tons/day Mso
2
= (2)(270 tons) = 540 tons
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