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Question
Wed March 07, 2012

# A block is on a horizontal slabwhich is moving horizontally and executing S.H.M. The co-efficient of static friction b/w block & slad is miu.If the block is not separated from slab,then determine angular frequency of oscillation?

Mon April 09, 2012
We can consider it as the slab and block is one system and it is attatched with a spring and the system is in SHM.

As the block will execute SHM due to friction , here the friction is internal force for the system of slab and block. So the w should be =(K/m+M)1/2 .
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Wed January 18, 2017

# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016

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