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engineering

A rigid tank contains $1.2 \mathrm{m}^{3}$ of argon at $-100^{\circ} \mathrm{C}$ and 1 MPa. Heat is now transferred to argon until the temperature in the tank rises to $0^{\circ} \mathrm{C}$ . Using the generalized charts, determine (a) the mass of the argon in the tank, (b) the final pressure, and (c) the heat transfer.

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chemistry

Balance the following equations: (a) The explosion of ammonium nitrate:

\mathrm{NH}_4 \mathrm{NO}_3 \longrightarrow \mathrm{N}_2+\mathrm{O}_2+\mathrm{H}_2 \mathrm{O}

(b) The spoilage of wine into vinegar:

\mathrm{C}_2 \mathrm{H}_6 \mathrm{O}+\mathrm{O}_2 \longrightarrow \mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2+\mathrm{H}_2 \mathrm{O}

(c) The burning of rocket fuel:

\mathrm{C}_2 \mathrm{H}_8 \mathrm{~N}_2+\mathrm{N}_2 \mathrm{O}_4 \longrightarrow \mathrm{N}_2+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}

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physics

A $15.0 \mathrm{~g}$ clothesline is stretched with a tension of $22.1 \mathrm{~N}$ between two poles $7.66 \mathrm{~m}$ apart. What is the frequency of the fundamental and the second harmonic?

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physics

Thorium $_{90}^{228}\mathrm{Th}$ produces a daughter nucleus that is radioactive. The daughter, in turn, produces its own radioactive daughter, and so on. This process continues until bismuth $_{83}^{212}\mathrm{Bi}$ is reached. Concepts: (i) How many of the 90 protons in the thorium nucleus are carried off by the $\alpha$ particles? (ii) How many protons are left behind when the $\beta^{-}$ are emitted? (iii) How many of the 228 nucleons in the thorium nucleus are carried off by the $\alpha$ particles? (iv) Does the departure of a $\beta^{-}$ particle alter the number of nucleons? Calculations: What are the total number $N_{\alpha}$ of $\alpha$ particles and the total number $N_{\beta}$ of $\beta^{-}$ particles that are generated in this series of radioactive decays?

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Continents

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