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- Question : 1P - What is the difference between the classical and the statistical approaches to thermodynamics?
- Question : 2P - Why does a bicyclist pick up speed on a downhill road even when he is not pedaling? Does this violate the conservation of energy principle?
- Question : 3P - An office worker claims that a cup of cold coffee on his table warmed up to 80 C by picking up energy from the surrounding air, which is at 25 C. Is there any truth to his claim? Does this process violate any thermodynamic laws?
- Question : 4P - One of the most amusing things a person can experience is that in certain parts of the world a still car on neutral going uphill when its brakes are released. Such occurrences are even broadcast on TV. Can this really happen or is it a bad eyesight? How can you verify if a road is really uphill or downhill?
- Question : 5P - How does the science of heat transfer differ from the science of thermodynamics?
- Question : 6P - What is the driving force for (a) heat transfer, (b) electric current, and (c) fluid flow?
- Question : 7P - Why is heat transfer a nonequilibrium phenomenon?
- Question : 8P - Can there be any heat transfer between two bodies that are at the same temperature but at different pressures?
- Question : 9P - Consider a 1000-kg car moving horizontally at a constant speed of 10 km/h on a straight path. What is the absolute minimum energy needed to move this car horizontally 500 m? Assume the final speed of the car is still 10 km/h.
- Question : 10P - What is the difference between pound-mass and pound-force?
- Question : 11P - Explain why the light-year has the dimension of length.
- Question : 12P - What is the net force acting on a car cruising at a constant velocity of 70 km/h (a) on a level road and (b) on an uphill road?
- Question : 13P - A man weighs 180 lbf at a location where g 32.10 ft/s2. Determine his weight on the moon, where g 5.47 ft/s2. Answer: 30.7 lbf
- Question : 14P - Determine the mass and the weight of the air contained in a room whose dimensions are 6 m 6 m 8 m. Assume the density of the air is 1.16 kg/m3.
- Question : 15P - At 45 latitude, the gravitational acceleration as a function of elevation z above sea level is given by g a bz, where a 9.807 m/s2 and b 3.32 10 6 s 2. Determine the height above sea level where the weight of an object will decrease by 1 percent.
- Question : 16P - If the mass of an object is 10 lbm, what is its weight, in lbf, at a location where g 32.0 ft/s2?
- Question : 17P - The acceleration of high-speed aircraft is sometimes expressed in g
- Question : 18P - A 5-kg rock is thrown upward with a force of 150 N at a location where the local gravitational acceleration is 9.79 m/s2. Determine the acceleration of the rock, in m/s2.
- Question : 19P - Solve Prob. 1
- Question : 20P - The value of the gravitational acceleration g decreases with elevation from 9.807 m/s2 at sea level to 9.767 m/s2 at an altitude of 13,000 m, where large passenger planes cruise. Determine the percent reduction in the weight of an airplane cruising at 13,000 m relative to its weight at sea level.
- Question : 21P - How do rating problems in heat transfer differ from the sizing problems?
- Question : 22P - What is the difference between the analytical and experimental approach to engineering problems? Discuss the advantages and disadvantages of each approach?
- Question : 23P - What is the importance of modeling in engineering? How are the mathematical models for engineering processes prepared?
- Question : 24P - When modeling an engineering process, how is the right choice made between a simple but crude and a complex but accurate model? Is the complex model necessarily a better choice since it is more accurate?
- Question : 25P - What is the value of the engineering software packages in (a) engineering education and (b) engineering practice?
- Question : 26P - Determine a positive real root of this equation using EES:
- Question : 27P - Solve this system of two equations with two unknowns using EES:
- Question : 28P - Solve this system of three equations with three unknowns using EES
- Question : 29P - Solve this system of three equations with three unknowns using EES:
- Question : 30P - Specific heat is defined as the amount of energy needed to increase the temperature of a unit mass of a substance by one degree. The specific heat of water at room temperature is 4.18 kJ/kg
- Question : 31P - A lunar exploration module weighs 4000 N at a location where g 9.8 m/s2. Determine the weight of this module in newtons when it is on the moon where g 1.64 m/s2.
- Question : 32P - The weight of bodies may change somewhat from one location to another as a result of the variation of the gravitational acceleration g with elevation. Accounting for this variation using the relation in Prob. 1
- Question : 33P - A man goes to a traditional market to buy a steak for dinner. He finds a 12-oz steak (1 lbm 16 oz) for $3.15. He then goes to the adjacent international market and finds a 320-g steak of identical quality for $2.80. Which steak is the better buy?
- Question : 34P - The reactive force developed by a jet engine to push an airplane forward is called thrust, and the thrust developed by the engine of a Boeing 777 is about 85,000 lbf. Express this thrust in N and kgf.
- Question : 35P - Write an essay on the various mass- and volume-measurement devices used throughout history. Also, explain the development of the modern units for mass and volume.

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