The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?
frequency of collision of trapped air molecules with walls of the syringe is more
molecules of trapped air expands more
speed of the trapped air molecules decreases
number of molecules of trapped air increases
Which of the following devices is used to determine the relative density of an acid?
A block of wood of density 0.6 gcm-3, weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm-3. Calculate volume of the portion immersed (g = 10ms-2)