|
Un article trouvé pour ce sujet.
 |
|
|
|
|
|
|
|
|
How much work is done? |
2011-10-15 |
|
Jean pose la question :
"A conical buoy that weighs B pounds floats upright in water with its
vertex "a" feet below the surface. A crane on a dock lifts the buoy
until its vertex just clears the surface. How much work is done ?"
Penny Nom lui répond. |
|
|
|
