A piece of wood is floating in water kept in a bottle. The bottle is connected to an air pump. Neglect the compressibility of water.

(a) (i) and (ii) 

Charcoal is considered a better fuel than wood because: (i) It has high calorific value. (ii) It does not produce any smoke. Disadvantages: (i) 1 kg of wood on destructive distillation produces only 0.25...

(c) evaporation and condensation.

(b) with a decreasing upward acceleration Explanation:  Just when the wood is released, the net force on it is B-W, {Buoyancy minus weight}upward. If the mass of the wood be m, then...

Let the minimum edge of the block = X cm  The volume of the ice block =X³ cm³ =X³/10⁶ m³  Density of the ice = 0.9*1000 kg/m³ =900 kg/m³  The weight of the...

Let the mass of the lead piece =X g  Total weight of the wood and the lead = 200+X g  The volume of the lead piece = X/11.3 cm³   {Since the density of...

The correct answer is (c) (d)  (c) If both are picked up by bare hands, the steel will be felt hotter than the charcoal.  (d) If the two are picked up from...

(a) is towards east if the vehicle is accelerating (b) is zero if the vehicle is moving with a uniform velocity Explanation:  When the vehicle is accelerating towards east the frictional force must...

(b) with a decreasing upward acceleration Explanation:  Just when the wood is released, the net force on it is B-W, {Buoyancy minus weight}upward. If the mass of the wood be m, then it has...

(A) just after it is dropped from the window of a stationary train  (B) just after it is dropped from the window of a train running at a constant speed of...