Physics OBJ
1-10 BABDAECDEB
11-20 CDADDDBCBB
21-30 DBEBBEACEB
31-40 EBEBCBCCDA
41-50 BDBCEDAAAE
51-60 AAABBACECA
1 ai)
i) Rockets are used for space travels .
ii )Rockets are used for launching satellites
into space
1 aii)
i) Artificial Satellites are used to send signals
for televisions,radio , etc
ii )Artificial satellites they are used for
monitoring cloud patterns for a weather
station
1 b)
A propeller like piece called turbine is been
rotated continuously by falling water from a
dam, which then turns a metal shaft in an
electric generator ,which is the motor that
produces electricity
===================
2 a)
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i) distance covered= 5 m+ 10m =15 m
ii )magnitude of his displacement
= a^ 2 =b ^ 2 +c ^ 2
x^ 2 = 5^ 2 + 10^ 2 =25 + 100
x^ 2 = 125
x= sqr 125
= 5sqr 5 m
====================
4 a)
i) pulley
ii )the inclined plane
4 b)
CLICK HERE TO VIEW THE IMAGE
load- -- - -- > fulcrum- -- -- - >effort
eg- crowbar
=================
5 )
V 1= 700cm ^ 3 , T 1 = 30dgree -census
+ 273= 303k, P 1 = 606mmHg
V 2= 700- 300= 400cm ^ 3, T 2 = 47+ 273= 320k
from general gas law
P 1V 1 / T 1 = P 2 V 2/ T 2
606* 700/303 =P 2 * 400/320
P 2= 606* 700* 320/ 303*400
P 2= 1120 mmHg
==================
8 a)
Electric current is the rate of charge flow
past a given point in an electric circuit,
measured in Coulombs / second which is
named Amperes.
8 b)
d =30 cm ,£ = 1. 5 *10 ^- 5 c r= 30 cm
30/ 100= 0 .3 m
V =kE /r = 9 *10 ^9 * 1. 5 *10 ^- 5 /0 . 3
= 13.5 * 10^ 4
= 13.5 * 10^ 5 /3
V =4 . 5* 10 ^5
V =450 kv
================
9 a)
i) by heating
ii )electrical method
9 b)
energy stored = 1/ 2 CV^ 2
given that t
C =4 HF = 4 * 10^ -6 F
v= 800v
= 1/ 2 *4 * 10^ -6 * 800* 800
= 2* 800* 800* 10^ -6
= 1280000j* 10^ -6
= 1. 28j
================
11)
Tabulate
-Hard Xray-
i) high penetrating power
ii )short wave length
iii)produce high voltage
-soft Xray -
i) low penetrating power
ii )long wave length
iii)produced at low voltage
=================
12) CLICK HERE TO VIEW THE IMAGE
(12 a) centre of gravity can be define as the
point through which the line of action of the
weight of the body always passes
irrespective of the position of the body .
12b )
C .g = centre of gravity
:- v = u - gt
Of maximum height v= O - K
O = u -gt
For vertical component, U = uSin tita
Therefore O = usin tita - gt
gt = uSin tita
T =uSin tita / g
Where T is the time taken to maximum
height
12c )
Taken moment about point A
Cwm = { 60* 10) + ( 20* 60)
Cwm =600 +1200
Cwm =1800
Acwm = (20 *40 ) + ( R3 * 40)
Acwm= 800+ 80 R3
At equilibrium , Cwm = Acwm
1800 = 800+ 40r 3
1800 -800 =40 r3
1000 = 40r 3
R 3= 1000 / 40
R 3= 25 N
====================
13a )
dew point is the temperature at which the
water vapour present in the atmosphere is
just sufficent to saturate it
13b )
mist is formed as a result of condensed
drops of moisture throughout the mass of
cooled air . That is when water droplet in the
air cool suddenly
13ci)
the plastic comb will acquire electric charges
13cii )
the plasic com can attract small pieces of
paper due to the acquired charges
13di)
area expansivity( B)= 2§
= 2* 1 .2 * 10^ -5
B =2 . 4* 10 ^- 5 1 k
13dii )
given that initial length= 6 cm
initial area A = 6 *6 = 36cm ^ 2
rise in temperature = 25k
linear expansivity = 1. 2 *10 ^- 5 /k
area expansivity = 2 .4 * 10^ - 5/ k
new area At =Ao (1 + Btita )
At= 36( 1 +2 . 4* 10 ^- 5 *25 )
At= 36( 1 + 60* 10^ - 5)
At= 36( 1 +0 . 0006 )
At= 36( 1 .0006 )
At= 36. 0216
15a )electrical potential is the work required to transfer a unit positive electric charge from an infinite distance to a given point against an electric field.
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