Calculations Made Easy for Beginners

[Acstars]

Thank you <3

 

[CompuChip]

How about you start with question a)
It's an estimate, so go look in a mirror... as long as you don't come up with 5 cm² or 12 m² or something in m³ or kW/m you're fine.

For b), I think the question is fairly straightforward. But if you have no idea, you can look at the units. You are given something in J/(s m²), something in m² (from a) and something in s (a duration is given in the question). The units you need to have are J (Joules, you are asked for an energy). How can you combine these?

 

[Acstars]

^___^

 

[dacruick]

For a if the average height was 170cm and the width is 30cm.
Surface area = height X width
SA = 170 X 30
SA = 5100cm
SA = 51m^2
It seems pretty off though?

5100cm² seems right, but there is an issue in your conversion to m².

 

[gneill]

You can always look it up, too, for comparison purposes:

http://en.wikipedia.org/wiki/Body_surface_area

When you do your energy calculations, remember that only one "side" of a person faces the sun at any given time.

 

[Acstars]

^___^