Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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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%?
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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.
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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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- 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_forwardA small particle has charge -4.30 μC and mass 2.00×10-4 kg. It moves from point A, where the electric potential is VA = 260 V, to point B, where the electric potential VB = 960 V is greater than the potential at point A. The electric force is the only force acting on the particle. The particle has a speed of 4.60 m/s at point A. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Electric force and electric potential. - Part A What is its speed at point B? Express your answer in meters per second. ΜΕ ΑΣΦ v = Submit Request Answer Part B Is it moving faster or slower at B than at A? Faster Slower Submit Request Answer ? m/sarrow_forwardHow long would it take a current of 100 A to deposit 10.0 g of Fe from FeCl 2arrow_forward
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