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Babynini
 one year ago
Work and Force.
Babynini
 one year ago
Work and Force.

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Babynini
 one year ago
Best ResponseYou've already chosen the best response.1A car drives 800ft on a road that is inclined 9 degrees to the horizontal. The car weighs 2700lb. Thus gravity acts straight down on the car with a constant force. F=2700j. Find the work done by the car in overcoming gravity. You are expected to use vectors and the appropriate formula to find work.

rational
 one year ago
Best ResponseYou've already chosen the best response.2dw:1433491777790:dw

rational
 one year ago
Best ResponseYou've already chosen the best response.2Force : F = <0, 2700> Displacement : s = <800cos(9), 800sin(9)> yes ?

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1what's that j thing? that would be just the other angle there? 81?

rational
 one year ago
Best ResponseYou've already chosen the best response.2i : unit vector along horizontal direction (x axis) j : unit vector along vertical direction (y axis)

rational
 one year ago
Best ResponseYou've already chosen the best response.2F=2700j is same as F= 0i  2700j

rational
 one year ago
Best ResponseYou've already chosen the best response.2simply take the dot product for work done \[W = F\bullet s \]

rational
 one year ago
Best ResponseYou've already chosen the best response.2W = F.s = <0, 2700> . <800cos(9), 800sin(9)> = ?

rational
 one year ago
Best ResponseYou've already chosen the best response.2what happened to the negative sign

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1..it didn't want to be there xD *337898.445

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1the work is negative?

rational
 one year ago
Best ResponseYou've already chosen the best response.2Yes the work done by gravity is negative so, the work done by the car will be positive : +337898.445

Babynini
 one year ago
Best ResponseYou've already chosen the best response.1Fabulous. That makes sense :) thank you soo much!
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