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2021 NECO PHYSICS PRACTICAL ANSWER

(1)
M/g; 50.0|70.0|90.0|110.0|130.0|
t,/s; 5.10|9.10|10.30|12.20|13.70|
t(s); 0.255•0.455|0.515|0.610|0.685|
T²(s²)0.065|0.207|0.265|0.372|0.469|
(1ix)
Graph.
(1x)
Slope; s DM/DT²
=178-50/0.7-0.07
=128/0.63
=203.1746
=203.17g|s²
(1xii)
(i)i avoided drought by closing the window
(ii)i avoided error due to parallax when reading the meter rule
(1bi)
Tabulate.
-Period-
(i)is the time taken on complete one oscillation/circle or to.
(ii)unit is second (s)
(iii)it is Oscillation motion
(iv)it is when a body moves in a to and fro manner
-Frequency of oscillation-
(i)is the number of complete oscillation in one second
(ii) frequency; unit Hertz (Hz)
(iii)it is Rotation motion
(iv)it is when a body turns about an axis through the body
(1bii)
E= 25J
Extension= 6.7×10-²m
Force constant (k) = ?
E= 1/2ke²
2E = ke²
k = 2E/e²
k = 2x 25/(0.067)²
k = 50/0.00449
k = 11135.9Nm-¹
=====================================
2bi) A real image is formed outside the system, where the emerging rays actually cross; such an image can be caught on a screen or piece of film and is the kind of image formed by a slide projector or in a camera.
The image developed by a plane mirror is virtual and laterally inverted.
=====================================
(3)
Tabulate
R(n); 2.0|4.0|6.0|8.0|1.0|
I(A); 0.80|0.64|0.46|0.36|
I^-¹(A^-¹)1.2500|1.5625|2.1739|2.7778|3.3333
(3viii)
Slope s= DI^-²/DR
=3-1/9-2=2/7=0.2857
(3ix)
Intercept C : 0.40
(3x)
K=c/5-2=0.40^²/0.2857=1.4-2=0.6
(3)
(3xi)
(i)I ensured tight connections
(ii) I avoided error due to parallax on the ammeter
(3bi)
(i)Free electrons
(ii)Protons and Electron
(iii)Electrons and ions
(3bii)
I=E/R+r
I=2*2/4+1=4/5=0.8A

Posted by on July 12, 2021.

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