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bubakazouba
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Homework Statement
a light scale pan is attatched to a vertical inextensible sring. The scale-pan carries two masses A and B. The mass of A is 400g and the mass of B is 600g. A rests on top of B, as shown in the diagram.
The scale-pan is raised verticaly, using the string with acceleration 0.5 m/s².
a)find the tension in the string.
b)find the force exerted on mass B by mass A
c)find the force exerted on mass B by the scale-pan.
visual representation of the problem http://i1269.photobucket.com/albums/jj597/bubakazouba/test_zps62ac1992.png
Homework Equations
F=ma
g=9.8 m/s²
The Attempt at a Solution
I got a) correct, I just said
Tension-(0.4x9.8 +0.6x9.8)=0.4x0.5+0.6x0.5
Tension-9.8=0.5
tension =9.8+0.5=10.3N
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b)find the force exerted on mass B by mass A
I think the answer is mg its the weight, because its the only downward force on A so it should be 0.4x9.8=3.92, but its not right.
What am i missing here?
Thanks in advance
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