Physics (Essay) Paper 2 WASSCE (PC 2ND), 2022

Question 9

 

(a)        Give three examples of thermometric properties

(b)        A quantity of water of mass 20 g at -5oC was gradually heated until it finally boils.
(i)         Sketch a graph of density against temperature for the heating process.
(ii)        Calculate the minimum energy required to melt the ice.
[ specific heat capacity of ice = 2.1 x 103 J kg-1,Specific latent heat of fusion of ice = 3.2 x 105 J kg-1] 

(c)        Define each of the following terms associated with a simple machine:
(i)         load;
(ii)        velocity.

(d)       State whether or not velocity ratio is affected by frictional forces and give the reason for your answer.

(a)        Give three examples of thermometric properties.

(b)     A quantity of water of mass 20 g at -50C was gradually heated until finally boils.

                        (i)         Sketch a graph of density against temperature for the heating process.

                        (ii)        Calculate the minimum energy required to melt the ice.
[ specify heat capacity of ice = 2.1 x 103 J kg-1 K-1, Specify latent heat of fusion of ice = 3.2 x 105 J kg-1]

(c)        Define each of the following terms associated with a simple machine;

                        (i)         load;

                        (ii)        velocity ratio.
(d)        State whether or not velocity ratio is affected by frictional forces and give the reason for your answer.

Observation

 

(a)   Examples of thermometric properties

Change in :

  • Volume
  • Resistance
  • Length
  • Pressure
  • Emf
  • Colour

 

(c)        Definition of terms
(i)  Load: The force overcome (by the effort applied) in a simple machine.
OR
The force overcome when work is done.

(ii) Velocity Ratio : The ratio of effort distance to load distance.                                                                                                                                                                                              
(d) It is not affected by frictional force                                                   
Reason : It is a ratio of distances.