Emissions of heat-trapping carbon dioxide (CO2) reached an all-time high of 36.9 gigatons in 2014, a 2.5% increase over 2013. The International Energy Agency said this further reduces the chance that the world could avoid a dangerous rise in global average temperature by 2020. (a) If the discharge of CO2 continues at the same 2.5% rate per year for the next 6 years, how many gigatons will be released in 2020, and (b) what will be the total percentage increase between 2014 and 2020?
What will be an ideal response?
(a) CO2 discharge = 36.9(1 + 0.025)?
= 42.79 gigatons (4.279 × 10¹? tons)
(b) Total % increase = [(42.79 – 36.9)/36.9](100)
= 15.96%
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a plug, ball, or butterfly valve has a trim identification symbol, it is because _____.
a. the plug, disc, closure member, or stem are of different material from the body b. every valve has a trim identification symbol on it c. the ISA mandates it d. it is designed for corrosive liquids
The efficiency of a Carnot cycle operation between the same temperature limits as the diesel cycle above is nearest:
The pressure and temperature at the inlet to an ideal diesel cycle, with P-v diagram shown, are 100 kPa and 10ºC. It has a compression ratio of 18 and a cut-off ratio of 2. The maximum temperature in the cycle is 1400ºC. Assume constant
specific heats from Table below for all calculations.
A) 87%
B) 85%
C) 83%
D) 81%
How does a reservoir reduce flooding hazard?
What will be an ideal response?
Over the past 50 years, more than 3 million acres have been preserved using the _____
a. Sodbuster Act b. Lacey Act c. Duck Stamp Act d. Swampbuster Act