In times of economic difficulty, people are often willing to pay short-term costs in order to obtain a benefit in the long term.
a. true
b. false
b. false
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Show that the friction factor in the Darcy-Wiesbach equation for laminar flow is 64/ReD.
What will be an ideal response?
What is happening inside a star while it expands into a subgiant?
A) It is fusing hydrogen into helium in the core. B) It is fusing hydrogen into helium in a shell outside the core. C) It is fusing helium into carbon in the core. D) It is fusing helium into carbon in a shell outside the core. E) It is not fusing any element; it is contracting and heating up.
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day, and the heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) How much thermal energy is exhausted each day? (c) Using the same heat reservoirs, what is the maximum possible efficiency for a thermodynamic engine?
The location in the Hertzsprung-Russell (H-R) diagram of giant stars fusing helium is referred to as the vertical branch
Indicate whether the statement is true or false