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gravel is dropped into a conveyer belt at rate of 0.5kg/sec. the xtra force needed to keep the belt moving at 2m/s is?
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This is the case of same velocity and changing mass.
So F=-u*(dm/dt)= 2*0.5=1N <F-dp/dt=d/dt(mv)=v(dm/dt)+m(dv/dt)= v*(dm/dt) bcoz vel remains constt, dv/dt=0>
So a force equal to newton is required.
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