2014/15 NECO PHYSICS PRATICAL ANWSERS BELOW ( SKYDINO,NET ) 1a)PLOT THE GRAPH URSELF s/n=1,2,3,4,5 L(cm)= 90,85,80,75,70 t(s)=4.70,4.50,4.30,4.00,3.80 Calculate T=t/10(s), T2(S2), L3(cm3) Slope S=change in L3/change in T2 = 720,000-200,000/0.225-O.11 = 520000/0.115 = 4521739.13cm3/s2. [Source Skydino,net] PRECAUTION TAKING 1. I made sure rigid support of the apparatus 2. I avoided error due to parallax when reading my stopwatch 3. I made sure I oscillate at small angle 4. I minimized draught (1bi) The mass M serves as an oscillator (1bii) 1. Simple Pendulum bob 2. Loaded test tube 3. Loaded Spiral Spring 4. Skin of talking drum 5. Helical Spring (3a) Plot Graph Urself e.m.f(E)=3.00v, I=O.62A V=1,2,3,4,5,6 PJ=L(cm)=20,30,40,50,60,70 I(A)=0.58,0.50,0.45,0.40,0.35,0.32 y=E/2(V/A)=5.172,6.000,6.667,7.500,8.571,9.375. Slope(S)=change in y/change in L =10.20-4.00/80-7 =6.20/73 =0.0849v/Acm The intercept C in the vertical area is 2.70V/A K=IC K=0.62X2.70 K=1.674 PRECAUTION TAKING (Write just 2 out of the Below) 1. I Ensured tight connection of the wires of all the instrument used 2. I maintained steady flow of current before taking my reading 3. I made sure that i removed the key after each reading to avoid drain of the cell 4.I avoided error due to parallax on ammeter 5. I made sure that the jockey is not dragged on the wire of the potentiometre 3bi The Key K. This is because the key serves as switch which does not drain any current or voltage from the source of e.m.f. 3bii From the definition of resistivity P=R.A/L but A=^d2/4 P=R=^d2/4/L P=^Rd2/4L P4L=^Rd2 divide both side P4 L=^RD2/4P Where P is the resivitivity of the material. NOTE:-To Get The Rest Make 3comments And Also Hit The Like Button And Share Button,The 1st 30members To Follow The Step Will Get The Remaing Anwsers Immidiately.
Posted on: Thu, 05 Jun 2014 05:23:17 +0000