1. Indicate in the diagram below, possible positions of the star and its orbiting planet, which would result in astronomers obtaining spectra A, B and C above. (Motions of both star and planet are counterclockwise in this diagram.

2. How would astronomers use spectra A, B and C to precisely calculate how fast the star was moving?

3. How would the speed the star is moving allow astronomers to be able to deduce information about the orbiting planet? What type of information could the astronomers calculate?

4. Why did the first exoplanets discovered by this method tend to be called ‘hot Jupiters’? (Define a hot Jupiter.)

5. What is a ‘habitable zone’? How would astronomers decide if a planet was in a star’s habitable zone?

 

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method for its uncollectible accounts receivable. During the year, a monthly bad debt accrual is made by multiplying 3% times the amount of credit sales for the month. At the fiscal year-end of December 31, an aging of accounts receivable schedule is prepared and the allowance for uncollectible accounts is adjusted accordingly.At the end of 2010, accounts receivable were $574,000 and the allowance account had a credit balance of $54,000. Accounts receivable activity for 2011 was as follows:

 

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Methane, which is composed of 1 carbon and 4 hydrogens, lacks functional groups and is a gas at room temperature. upon replacing one of the hydrogen atoms with a hydroxyl group, methane is converted to a liguid called methanol. draw these 2 molecules. explain the reason behind the diiference in the physical properties of methane and methanol.

 

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Methane is burned with air in a continuous steady-state combustion reactor to yield a mixture of CO2, CO and water. The reactions taking place are

CH4 + 1½O2 → CO + 2H2O

CH4 + 2O2 → CO2 + 2H2O

The feed to the reactor contains 7.8 mol % CH4, 19.4 mol % O2, and 72.8 mol % N2. The percentage conversion of methane is 90.0% and the gas leaving the reactor contains 8 mol CO2/mol CO. How do i calculate the molar composition of the product stream using: Molecular and atomic balances and extent of teactions?

 

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Methane is burned completely with 40% excess air. The methane enters the combustion chamber at 25°C, the combustion air enters at 150°C, and the stack gas [CO2, H2O(v), O2, N2] exits at 450°C. The chamber function as a preheater for an air stream flowing in a pipe through the chamber to a spray dryer. The air enters the chamber at 25°C at a rate of 1.57*10^4 m^3 (STP)/h and is heated to 181°C. All of the heat generated by combustion is used to heat the combustion products and the air going to the spray dryer (i.e., the combustion chamber may be considered adiabatic).

I’m stuck on this question. Please upload the actual solution for this question.

This questions is from the Elementary Principles of Chemical Processes 4th edition.

 

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