Physics-
General
Easy
Question
A body of mass m is slowly halved up the rough hill by a force 
at which each point is directed along a tangent to the hill. Work done by the force
- independent of shape of trajectory
- dependes upon x
- depends upon h
- dependes upon coeffixcient of friction
The correct answer is: depends upon h
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A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x. Let be the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, = 2 N. Also shown is the variation of , the elongation of the spring The value of , if x = 3 cm is :
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Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure. The coefficients of friction between the floor and the blocks are as . Block A is pushed by an external force F. The value of F can be changed. When the welding between block A and ground breaks, block A will start pressing block B and when welding of B also breaks, block B will start pressing the vertical wall 
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STATEMENT-2 : To move the block placed at rest on rough inclined surface along the inclined surface, the net force on block (except frictional force) should be greater than 
. (N = normal reaction on block).
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STATEMENT-2 : To move the block placed at rest on rough inclined surface along the inclined surface, the net force on block (except frictional force) should be greater than . (N = normal reaction on block).
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Borax is converted into B by steps Borax 
I and II reagents are
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chemistry-General
