- #1
Tom Hardy
- 46
- 1
I have this question:
1. The problem
Convert 200 Btu to (a) BG (British gravitational), (b) SI and (c) cgs
(a) and (b) are fine I got 155600ftlb and 200kJ but the answer the sheet gives for cgs is 211x10^10 dyne but surely the answer is 211x10^10 erg?! I can correctly convert to erg but I have no idea how to convert energy (joules) into a force (dynes).
My working was since joule is kg.m^2/s^2 to turn it into cgs units I would times by 1000 to account for kg --> cm and times by 10,000 to account for m^2-->cm^2 and I get an answer of 211x10^10 but the units is what's bothering me. Surely the units should be 'erg'? But the answer sheet is showing 'dyne', is there a way to to convert energy (joule) to force (dyne) or is there an error on the answer sheet?
Many thanks
1. The problem
Convert 200 Btu to (a) BG (British gravitational), (b) SI and (c) cgs
The Attempt at a Solution
(a) and (b) are fine I got 155600ftlb and 200kJ but the answer the sheet gives for cgs is 211x10^10 dyne but surely the answer is 211x10^10 erg?! I can correctly convert to erg but I have no idea how to convert energy (joules) into a force (dynes).
My working was since joule is kg.m^2/s^2 to turn it into cgs units I would times by 1000 to account for kg --> cm and times by 10,000 to account for m^2-->cm^2 and I get an answer of 211x10^10 but the units is what's bothering me. Surely the units should be 'erg'? But the answer sheet is showing 'dyne', is there a way to to convert energy (joule) to force (dyne) or is there an error on the answer sheet?
Many thanks