Physics

Physics Objective

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Physics Theory


11a)principle  of conservation of linear momentum states that in a collision system, the total linear momentum  before the collision is equal to the totaWhy now ADEYEMI, u‘ve really changed. Dont allow d devil, always mal linear momentum after the collision .ke me HAPPY.


11b)during the propulsion of rocket, the gases filled in the rocket move backward in order to project the rocket forward. the net total of the linear momentum of the rocket & the exhaust gases is zero.

10c)i-it is not periodic. ii-the acceleration of the motion of the ball is not directly proportional to the distance between the two footballers

11c)i-it is not periodic. ii-the acceleration of the motion of the ball is not directly proportional to the distance between the two footballers


11d)i- the ball would hit the ground at the same time. ii-the time taken for the ball  to reach the ground depends on the height of the projection & free fall acceleration


12A)i-a machine is any devices which enable energy to be used for the performance of work in a convenient way. ii-*to transmit power from one shaft to another. *to transmit motion from one shaft to

another.


12a)iii-velocity ratio for a pair of gear wheel=angular velocity of d driving wheel/angular velocity of d driven wheel. iv-the mechanical advantage of a gear system can be increased by increasing d angular velocity of d driving gear wheel.


12bi)it velocity=number of teeth of the driven wheel/number of teeth of the driving wheel=18/15=1.5  12bii)efficiency=(M.A/V.R) X 100%, E=(70X100)/(90X1.5)=51.9N, d effort required is 51.9N.


12biii)calculated effort is less than d actual effort required because d defficiency of  d bicycle is less than 100%


13a)the critical angle of a glass is d angle of incidence in the glass when the angle of refraction in a less dense medium is 90degree.13b)i-a ray of light must travel from a less dense medium to a dense medium. ii-the wave length to the light should change on entering d glass


13di)p+20=45,p=45-20=25. Q=180-60=120.R=180-(25+120)=35. 3dii)refractive index n of the prism = sin i/sin r, n=sin 45/sin 25=0.7071/0.4226=1.67. iii-45 degree.  iv-total deviation D=50 degree


1)frictional force Fp along d plane=mgsin@, normal reaction R of d body=mgcos@, the co efficient of friction btw the surface in contact= mgsin@/mgcos@=sin@/cos@=tan@.   2) relative density of the metal =forceexerted gy the metal in air/force exerted in water=Fa/Fw=Kea/Kew=ea/ew=10.5cm/6.8cm=1.54


6a)surface area is defined as the force per unit length on either side of the imaginary line drawn on the liquid surface at rest.

6b)1-by boiling the water. 2-by adding camphor to the water


4a)electrodes are plates made up of metal or graphite through which electric current enter or leave d electrolytes in electric cells.  4b)t=20sec  m=200g  z=8.33 X 10^-4 gc, m=zIt,I=m/zt=200g/(8.33 X 10^-4 X120sec)=0.2 X 10^4 A, CURRENT I=2.0 X 10^3 A.


5)SOUND wave cannot be polarized because sound wave are longitudinal,they cannot be cut off when the plane of the polarizer is changed
   


5c)1-depletion of natural vegetation. 2-the problem of transportation of logs