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anonymous
 one year ago
A canoeist on a lake throws a 0.145 kg baseball at 40.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially. How fast is the first canoe moving after the pitch, assuming no friction with the water?
A. 0.048 m/s
B. 0.33 m/s
C. 20 m/s
D. 40 m/s
** :/
anonymous
 one year ago
A canoeist on a lake throws a 0.145 kg baseball at 40.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially. How fast is the first canoe moving after the pitch, assuming no friction with the water? A. 0.048 m/s B. 0.33 m/s C. 20 m/s D. 40 m/s ** :/

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2here, since we can neglet any friction forces acting on our canoe, we have to apply the theorem of conservation of total momentum

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2here is the situation described in your problem: dw:1433009286262:dw

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2the momentum of the ball is: \[\Large mv = 0.145 \times 40 = ...\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2the speed of the ball is referred to the water, and the water is at rest with respect to the earth

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2ok! that's right!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yay! what happens next?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2the momentum gained, by the system canoeist+canoe is: \[\Large MV = 120 \times V\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.2now both of those momentum have to be equal each other, so we can write: \[\Large 120 \times V = 5.8\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so 5.8=120*V V=0.0483333...? so our solution is choice A?
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