Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 3, Problem 5P
To determine
Find the equivalent power of coal in watts.
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An average American consumes approximately 105 kJ of energy per day. The average life expectancy of an American is 77.9 years.
How much coal would need to be burned to provide enough energy to meet a person's energy demands if the efficiency of energy production from coal is 38%?
☐g coal
If the energy present in a jet of water of 20 cm diameter and having a velocity of 25 m/s could be extracted by a device with 90% efficiency, the power extracted would be nearly.
sec²
m
tak ing
1
2g
0.051
2. The combined mass of a car and its passengers travelling at 72 km/hr is 3000 Ibm-
Find the kinetic energy in BTU of this combined mass.
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- A diesel engine required 9,800 kJ of heat to produce 1,800 kJ of power. What is its efficiency?arrow_forwardFind the energy required to increase the room temperature of a coffee in a cup to a temperature of 60°C.arrow_forwardWhat is the best definition for non- renewable energy? O a. It is energy collected by humans that can be replaced after five to ten years. O b. It is energy from finite sources that cannot be replaced by natural means at a quick pace of time. O c. It is energy from finite sources that can be replaced after using them. O d. It can be measured in joules or kilowatts.arrow_forward
- Determine the mass of carbon tetrachloride that should be mixed with 80 kg of glycerin so that the combined mixture has a density of 1450 kg/m3.arrow_forwardQ3: B: A 208 g of C6H6 (78 g/mol.) burns in air according to the equation: CHs + O2 - CO2 +H2O What mass of CO2 (44 g/mol.) is produced?arrow_forwardA petroleum refinery processes 100,000 barrels of crude oil per day and operates with an energy efficiency of 90%. The oil and the petroleum products have enrgy contents of 35 MJ/L. What are the energy and fuel volume flows to and from this refinery, in J/day? ( One barrel of oil is 159 liters).arrow_forward
- 4. The human heart pumps the average adult's 6.0 liters (6000 cm3) of blood through the body every minute. The heart must do work to overcome frictional forces that resist blood flow. The average blood pressure is 1.3x104 N/m² a) How much work does the heart do to move the 6.0 liters of blood completely through the body? b) What power output must the have to do this task once a minute? Hint: When the heart contracts, it applies a force to the blood. Pressure is force/area. Model the circulatory system as a single closed tube, with crosssectional area A and volume V=6.0 liters, filled with blood to which the heart applies a force.arrow_forwardConsider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat. The heat content of the coal is 8,000 Btu/lb, the carbon content is 60% by mass, and the sulfur content is 2% by mass. How much electricity (in kWh/yr) would the plant produce each year? How many pounds per hour of coal would need to be burned at the plant? Estimate the annual carbon emissions from the plant (in metric tons C/year). If the cooling water is only allowed to rise in temperature by 10 °C, what flow rate (in m3/s) from the stream would be required? What would be the river temperature if all the waste heat was transferred to the river water assuming no heat losses during transfer? Estimate the hourly SO2 emissions (in kg/h) from the plant assuming that all the sulfur is oxidized to SO2 during combustion.arrow_forward
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