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   DIR Return to: WAEC/NECO 2017/2018 UPDATE
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       #Post#: 55--------------------------------------------------
       Waec 2017 Physics (Alternative A) Practical Answers
   DIR By: anephy
       Date: April 3, 2017, 4:45 am
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       Solution
       (1)
       TABULATE:
       i:1,2,3,4,5,
       L(cm):80.00,70.00,60.00,50.00,40.00
       t1(s):17.87,16.22,16.09,14.08,13.28
       t2(2):17.56,16.46,15.09,14.77,13.36
       t(s)mean:17.715,16.340,15.590,14.425,13.320
       T(t/10)s:1.7715,1.6340,1.5590,1.4425,1.3320
       LogT(s):0.2483,0.2133,0.1928,0.1591,0.1212
       Log L(cm):1.9031,1.8451,1.7782,1.6990,1.6021
       Log T*10^-2(s):24.83,21.33,19.28,15.91,12.12
       Log L*10^-1(cm):19.031,18.451,17.782,16.990,16.021
       SLOPE(s)=(LogT2*10^-2 - LogT1*10^-2)(/Log L2 *10^-1 -
       LogL1*10^-1)
       =(21.33-12.12(s))*10^-2/(18.50-16.02(cm)*10^-1)
       =3.714*10^-1
       =0.3714cm^-1
       1axi)
       i)ensured supports of pendula were rigged
       ii)avoided parallax error on meter rule/stop watch
       1bi)
       simple harmonic motion is the motion of a body whose
       acceleration is always direct towards a fixed point and is
       proportional to the displacement from the fixed points
       1bii)
       T=1.2secs
       Log 1.2=0.079
       0079 shown on graph with corresponding Log L read L
       correctly determined
       2b)
       bi)The boiling point of a liquid is the temperature
       at which the vapor pressure of the
       liquid equals the pressure surrounding the liquid
       and the
       liquid changes into a vapor.
       bii) impurities increases the temperature range a
       substance can exist as a liquid
       (3a)
       TABULATE:
       x(cm):10,20,30,40,50,60
       V(v):0.65,0.75,1.00,1.20,1.45,1.55
       I(A):0.20,0.30,0.35,0.40,0.45,0.55
       LogV(v):-0.187,-0.125,0.000,0.079,0.161,0.190
       LogI(ohm):-0.699,-0.523,-0.456,-0.396,-0.391,-0.360
       SLOPE(s):=( LogI2-LOgI1)/(LogV2-LogV1)
       =-0.2-(-0.7)/0.3-(-0.2)
       =0.5/0.5
       =1AV^-1
       3axi)
       i)ensured clean/tight terminals
       ii)open key when reading was taken
       3bi)
       i)brightness of the bulb increases
       ii)voltage/current through the bulb increases
       3bii)
       i)diode
       ii)transistor
       ¡¡) capacitor
       ¡¡¡)transistor
       ¡v)thermistor
       V)thyristor
       =====KEEP REFRESHING====
       Typing...
       *PHYSICS*
       ==========================
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