Seaweed contains plant ____________________ that stimulate root growth
Fill in the blank(s) with correct word
hormones
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Gas at constant T and P is contained in a supply line connected through a valve to a closed tank containing the same gas at a lower pressure. The valve is opened to allow flow of gas into the tank, and then is shut again.
(a) Develop a general equation relating 
and 
the moles (or mass) of gas in the tank at the beginning and end of the process, to the properties 
and 
the internal energy of the gas in the tank at the beginning and end of the process, and H?, the enthalpy of the gas in the supply line, and to Q, the heat transferred to the material in the tank during the process.
(b) Reduce the general equation to its simplest form for the special case of an ideal gas with constant heat capacities.
(c) Further reduce the equation of (b) for the case of 
= 0.
(d) Further reduce the equation of (c) for the case in which, in addition, Q = 0.
(e) Treating nitrogen as an ideal gas for which 
apply the appropriate equation to the case in which a steady supply of nitrogen at 25°C and 3 bar flows into an evacuated tank of 4 
volume, and calculate the moles of nitrogen that flow into the tank to equalize the pressures for two cases:
1. Assume that no heat flows from the gas to the tank or through the tank walls.
2. Assume that the tank weighs 400 kg, is perfectly insulated, has an initial temperature of 25°C, has a specific heat of 
and is heated by the gas so as always to be at the temperature of the gas in the tank.
The most serious Confederate threat to the Union blockade came from
A. British navy vessels on loan to the South. B. swift blockade-running steamers. C. the threat of mutiny from pro-Southern sailors. D. the entrance of the British and French navies as direct military combatants on behalf of the Confederacy. E. the ironclad Merrimack (renamed the Virginia) warship, which destroyed two wooden ships of the Union navy off the Chesapeake Bay and threatened to destroy many more wooden Union warships.
Parting tools can jam in the cut and break as a result of:
A) Cutting speed that is too high B) The tool is set above center C) Feed that is too light D) Lack of cutting oil or too heavy feed
____________________ design, also called green or eco-design, happens when designers think about the ecological impacts of the design solution.
Fill in the blank(s) with the appropriate word(s).