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Physics OBJ :
1 - 10 : BAEDEECDEB
11 - 20 : CDADDDBCBB
21 - 30 : DBEBBEADEB
31 - 40 : ABEBCBCCDA
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 )

i )distance covered = 5 m +10 m = 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

= 5 sqr 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 =30 dgree- census + 273=303k ,

P 1 =606mmHg

V 2 =700- 300= 400cm^ 3 , T 2 =47 +273= 320k

from general gas law

P 1 V 1/ T 1 = P2 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 = 450kv

================

9 a )

i )by heating

ii )electrical method

9 b )

energy stored =1 / 2CV ^ 2

given that t

C = 4HF = 4 * 10 ^ - 6F

v = 800v

= 1 /2 * 4 * 10 ^ - 6 * 800* 800

= 2 * 800* 800* 10 ^ - 6

= 1280000 j * 10 ^ - 6

= 1 . 28 j

================

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 a )

CLICK HENaijacomms.comRE TO VIEW THE IMAGE

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 .Naijacomms.com

12 b)

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

12 c )Naijacomms.com

Taken moment about point A

Cwm = { 60 * 10 ) + (20 * 60 )

Cwm = 600+1200

Cwm = 1800

Acwm = (20 * 40 ) + ( R 3 * 40 )

Acwm =800+ 80 R 3

At equilibrium , Cwm = Acwm

1800 = 800+40 r 3

1800 - 800= 40 r 3

1000 = 40 r 3

R 3 =1000 / 40

R 3 =25 N

====================

13 a)

dew point is the temperature at which the water vapour

present in the atmosphere is just sufficent to saturate it

13 b)

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

13 ci )

the plastic comb will acquire electric charges

13 cii)Naijacomms.com

the plasic com can attract small pieces of paper due to

the acquired charges

13 di )

area expansivity (B )= 2 §

= 2 * 1 . 2 * 10 ^ - 5

B = 2. 4 * 10 ^ - 5 1k

13 dii )

given that initial length= 6 cm

initial area A = 6* 6 =36 cm^ 2

rise in temperature =25 k

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

=================

15 a)

electrical potential is the workdone in driving a unit

charge of electric current from one point to another in aNaijacomms.com

closed circuit. It is measured in volta ( V)

15 b)

DIAGRAM LINK COMMING SOON

A metal rod can be made into a magnet by divided touch

me thod as shown in the diagram above .Naijacomms.com

The metal rod is stroke at the middle with opposite pole

end of two permanent magnets towards the opposite

ends several times opposite polarity are then formed

15 ci )

DIAGRAM LINK COMMING SOON

VR = 120v - - - - > Vl =50 v - - - - > Vc= 134. 39 v

220v , 506z

15 cii)Naijacomms.com

V ^ 2= Vr^ 2 +( Vl - Vc )^ 2

220^ 2 =120^ 2 +( 50 - Vc )^ 2

48400 =14400 +( 50 - Vc)^ 2

48400 =14400 =( 50 - Vc)^ 2

34000 =( 50 - Vc)^ 2

50 - Vc= sqr 34000

50 - Vc= 184. 39

- Vc= 184. 39 - 50

Vc =134. 39 v

; the potential difference acrross the capaitor is 134. 39 v

====================

====================

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