PLEASE ANSWER ALL PARTS OF THE QUESTIONS AND SHOW WORK IN ORDER TO GET POINTS TH

Question

PLEASE ANSWER ALL PARTS OF THE QUESTIONS AND SHOW WORK IN ORDER TO GET POINTS THANKS

1. convert the following temps

a)90 deg F to ____deg C

b) -29 deg C to ____ deg F

c) -94 deg F to ______K

d) 98.6 deg F to ______deg C

2. Highway slabs of concrete are poured in lengths of 10.0 m. How wide should the expansion gaps between the slabe be at a temperature of 20.0 deg C to make sure that there will be no contact between adjacent slabs over a temperature rang of -25 deg C to 45 deg C

3.Calculate the total quantity of heat in both "J-joules" and "Kcal-Kilocalories" required to change 1.00 kg of ice at -20.0 deg C to steam at 120.0 deg C. note that this process requires a total of several calculations that include phase changes. Assume that there are no losses of mass or temperature in the conversions.

4. a heat engine absorbs 250 Kcal of heat from a high temperature reservoir and exhausts 175 Kcal to a low temperature reservoir.

a) determine the engines thermal efficiency from the efficiency of an idea gas heat engine.

b) from the efficiency that you have calcualted , how much heat is actually converted into useful work?

Explanation / Answer

Use the thermal expansion equation, dL = LAdT. Put in the values of 45 C (convert to kelvin first!) for T to find how much it could expand at maximum. L 10m and you'll need to look up the thermal coefficient of concrete, which is A. This will give you dL, which is the maximum it could expand. Use that to find the gap widths.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.