An enzyme is a substance that slows down or stops a chemical process.
Answer the following statement true (T) or false (F)
False
Rationale: An enzyme is a substance that speeds up or stimulates a chemical process.
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Power cycles typically have an efficiency well below the efficiency of a Carnot cycle. Which of the following is most responsible for this?
A) Friction B) Heat transfer across a finite temperature difference C) Heat transfer from pipes connecting the various components D) Pressure drops in pipes
It is estimated that about _____ of the population of the United States suffers from some type of food allergy
a. 1.5% c. 33% b. 10.5% d. 45.5%
You are asked to calculate ?H when 0.1 kg of steam is heated at a constant pressure of 0.1 MPa from 373.15 K to 423.15 K. You remember learning that the heat capacity of water is about 4.19 kJ/kg•K, so you multiply 0.1 kg by 50 K by 4.19 kJ/kg•K and get an answer of 20,950 joules. Which of the following is the best assessment of your answer?
A. Your calculation is accurate, but you should round the answer to 21,000 joules, since your heat capacity only had three significant figures and 20,950 joules has four. B. This is a reasonable estimate of ?H, but it would have been more accurate to use the data in the steam tables than to use MCP?T. C. This is a reasonable estimate of ?H, but it assumes CP is constant with respect to temperature. You can get a more accurate answer by accounting for the temperature dependence of CP. D. This is not a reasonable estimate of ?H. 4.19 kJ/kg•K is a heat capacity of liquid water and you cannot assume water vapor has the same heat capacity. E. This is not a reasonable estimate of ?H. You should have used CP* = (5/2)R.
Baseband transmissions consist of multiple data channels.
Answer the following statement true (T) or false (F)