Suppose the current through a wire is given by the curve shown in Figure P2.9.



Known quantities:

Current-time curve

Find:

a) Amount of charge during 1st second

b) Amount of charge for 2 to 10 seconds

c) Sketch charge-time curve


Analysis:

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In the following equation of state, a is constant.

P= RT/?V+ (aT^1.5)/?V^2 Which of the following is a correct expression for the molar enthalpy residual property for this equation of state? A.RT(Z-1)+(1.5aT^1.5)/?V B.RT(Z-1)-RT ln??V-(1.5aT^1.5)/?V-P?V C.RT(Z-1)-(1.5a?T)/?V-P?V D.RT(Z-1)-(0.5aT^2.5)/?V E.None of these are the correct expression.

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Most welding processes produce a(n) ____ in which the metals are heated over a range of temperatures.

A. thermal cycle B. fusion cycle C. interpass temperature D. phase change

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The construction industry is not moving with great haste towards standardized methods and materials

Indicate whether the statement is true or false

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Nearly all of the faux evergreen items are made from ____, a type of plastic that can be rolled into

sheets.

a. resin and ethylene b. synthetic acetate c. polyvinyl chloride, abbreviated as PVC d. flame-retardant vinyl

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