Hey guys, I could do with some help. I know its fairly simple stuff but I'm just dammed if I can do it at the moment, it melts my mind.
4. [1pt]
Identify each of the following as E-Energy, P-Power, N-Neither. (If the first is E, the second is P, and the rest are N, enter
EPNNNN)
A) horsepower/day
B) kilocalorie
C) joules*seconds
D) kW/hr
E) kilowatt*hour
F) joules/sec
6. [1pt]
It has been estimated that a person can perform continuous manual labor at a power of 60 Watt for an 8 hour working day. How many gallons of crude oil contain the energy equivalent of the useful physical labor a person can perform in this time period? (Do not enter units, just the number of gallons)
(This one has really confused me as I was sure that I was doing it right when I calculated that the person would generate 480Whr and that going off the book a gallon of crude was equal to 40.47 KWhr so I thought it would be 0.11 or thereabouts).
7. [1pt]
The population of Boulder County in 1995 was roughly 2.500×105. In 2005, it
was more like 3.178×105. Assume (for this question) that the growth rate
has been constant these 10 years, and will continue growing at this same rate
indefinitely. How many years from 2005 will the population double from the 2005
level? (Don't enter units, just the number of years)
(Again this one has confused the hell out of me)
If anyone does decide to help then thanks a lot, if nobody does then I really don't blame you.
4. [1pt]
Identify each of the following as E-Energy, P-Power, N-Neither. (If the first is E, the second is P, and the rest are N, enter
EPNNNN)
A) horsepower/day
B) kilocalorie
C) joules*seconds
D) kW/hr
E) kilowatt*hour
F) joules/sec
6. [1pt]
It has been estimated that a person can perform continuous manual labor at a power of 60 Watt for an 8 hour working day. How many gallons of crude oil contain the energy equivalent of the useful physical labor a person can perform in this time period? (Do not enter units, just the number of gallons)
(This one has really confused me as I was sure that I was doing it right when I calculated that the person would generate 480Whr and that going off the book a gallon of crude was equal to 40.47 KWhr so I thought it would be 0.11 or thereabouts).
7. [1pt]
The population of Boulder County in 1995 was roughly 2.500×105. In 2005, it
was more like 3.178×105. Assume (for this question) that the growth rate
has been constant these 10 years, and will continue growing at this same rate
indefinitely. How many years from 2005 will the population double from the 2005
level? (Don't enter units, just the number of years)
(Again this one has confused the hell out of me)
If anyone does decide to help then thanks a lot, if nobody does then I really don't blame you.