WAEC May/June 2024 Alternative A Physics Practicals (Fluid mechanics: watch to the end)

[@josephogbonna7678]

Is it possible to manipulate the readings?

[@bestsciencebrain]

Watch to the end and you will see where the readings are being calculated. Thanks

[@josephogbonna7678]

​@@bestsciencebrainthanks so much. Please sir how do we know the value of the density of the mass used as you stated that the constant value for the iron mass is7.87gcm^3?
Again, will teachers report that value in their report sheet?

[@bestsciencebrain]

​​@@josephogbonna7678 The density is a standard value though can be determined experimentally. If you are using a steel or brass mass, the density will be slightly different but that has no effect on the readings or final solution. The slope determines the accuracy of the experiment. The relative density of Kerosene is 0.80 and you can see that the manipulated data gave a value of 0.833, which is the slope of the graph. In the real experiment, we got 0.90 as the slope, which is a slight variation but still acceptable. So don't bother about the density used. There is no provision in WAEC report form for teachers to state density. The density was used in that section because without it, you can not manipulate.

[@josephogbonna7678]

@@bestsciencebrain thanks

[@josephogbonna7678]

@@bestsciencebrain sir what I am asking is how do I know I should use density of brass or steel when nothing like that is given in the specimens?