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Physics-Obj PHYSIC TYPE C

1DDCADDBCDC

11ECACECCCBC

21EEABBBEDEE

31BECEBADDEC

41BDDBAEDEDB

51DAEACDBEDC

**Use This To Identify Your Answers For The Objectives.**

1D -I and II only

2D-3.34*10^-7N

3C-4.0*10^3

4A-332ms^-1

5D-0.45m

6D-saxophone and trumpet

7B-sqrootVR^2 (Vc-VL)^2

8C-copper

9D-II and III only

10C-4.84&10^-19J

11E-3.3*10^-10Ns

12C-Focusing collector

13A-benue

14C-recieves signal

15E-transportation

16C-101K

17C-prevent electric sparks

18C-R and RM

19B-5.0s

20C-173.2J

21E-80.0%

22E-Venier calipers and spring balance

23A-centrifugal

24B-360m

25B-beyond 2f

26B-52.50cm

27E-shekere

28D-diffusion

29E-I,II and III

30E-Neutrons

31B-5ohm

32E-400.0Vm^-1

33C-I and III only

34C13.30cm

35B-Hot body and thermophile

36A-before,before

37D-26.7mm

38D-10.5

39E-80.00mmHg

40C-7.74N 41B-(x-z)/(x-y)

42D-240m

43D-interchanging the polarity of the magnet

44B-minimize energy losses

45A-perforator

46E-15/16

47D-Y and X-Y

48E-(E2-E1)h^-1

49D-magnet is moving away from the coil

50B-150V

51D-VL leads IL by pie/2 rad

52A-A red surface appearing black when viewed under green light

53E-Sun and firefly

54A-2.0

55C-methane

56D-inertia

57B-Burning of firewood

58E

59D-momentum and weight

60C-w^2/2x

Theory Answers

NOTE: / means DIVISION

* means multiplication

tita u should know dat.

^ means raise to power

sqr rut/ squar rut means square root

1D -I and II only

2D-3.34*10^-7N

3C-4.0*10^3

4A-332ms^-1

5D-0.45m

6D-saxophone and trumpet

7B-sqrootVR^2 (Vc-VL)^2

8C-copper

9D-II and III only

10C-4.84&10^-19J

11E-3.3*10^-10Ns

12C-Focusing collector

13A-benue

14C-recieves signal

15E-transportation

16C-101K

17C-prevent electric sparks

18C-R and RM

19B-5.0s

20C-173.2J

21E-80.0%

22E-Venier calipers and spring balance

23A-centrifugal

24B-360m

25B-beyond 2f

26B-52.50cm

27E-shekere

28D-diffusion

29E-I,II and III

30E-Neutrons

31B-5ohm

32E-400.0Vm^-1

33C-I and III only

34C13.30cm

35B-Hot body and thermophile

36A-before,before

37D-26.7mm

38D-10.5

39E-80.00mmHg

40C-7.74N 41B-(x-z)/(x-y)

42D-240m

43D-interchanging the polarity of the magnet

44B-minimize energy losses

45A-perforator

46E-15/16

47D-Y and X-Y

48E-(E2-E1)h^-1

49D-magnet is moving away from the coil

50B-150V

51D-VL leads IL by pie/2 rad

52A-A red surface appearing black when viewed under green light

53E-Sun and firefly

54A-2.0

55C-methane

56D-inertia

57B-Burning of firewood

58E

59D-momentum and weight

60C-w^2/2x

Theory Answers

NOTE: / means DIVISION

* means multiplication

tita u should know dat.

^ means raise to power

sqr rut/ squar rut means square root

(1a)

-Coil

-Rotor

-Springs

(1b)

-For space exploration

-For warfare

-For scientific research

(1c)

-They are used as battery charger for boats

and caravans

-They are used for powering garden equipment

(2)

Given; d=10units

R(6,4) and S(2,K)

d=sqroot(y2-y1)^2+(x2-x1)^2

10^2=(k-4)^2+(2-6)^2

100=k^2-8k+16+16

k^2-8k+32-100=0

k^2-8k-68=0

k=8+_sqroot(8^2-4*1*-68)/2

k=8+_sqroot(64+272)/2

k=8+_sqroot(64+272)/2

k=8+_sqroot(336)/2

k=8+_18.3/2

k=8-18.3/2 or 8+18.3/2

k=-5.15 or 13.15

(4)

Velocity ratio(V.R)=1/sintita

4=1/sintita

sintita=1/4

tita=sin^-1(0.25)

(7)

This is because the speed of sound decreases

as temperature increases.On hot day the

temperature in high hence the speed decreases

while on cold day,the speed increases because

temperature is lowered

(8)

Given;length(l)=2.0m

Resistance(R)=3.0ohm

Diameter(d)=0.8mm

d=0.8*10^-3m

Resistivity=?

R=el/A

A=(pie*d^2)/4

=3.142/4*(0.8*10^-3)^2

A=(3.142*0.64*10^-6)/4

A=0.50*10^-7m^2

A=5*10^-7m^2

3.0=(e*2)/(5*10^-7)

e=(15*10^-7)/2

Resistivity(e)=7.5*10^-7nm

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

3) A trajectory is the curved path of an object that has been fired or throw/a path followed by a projectile.

3b) i) The force

ii) The mass of the body.

iii) The surface area of the projectile

(12a) -Sugar tongs->third class

-Nutcracker->second class

-Bottle opener->first class

(12b) (i)Archemedes' principle states that a body which is wholly or partially immersed in a fluid ,experiences loss in wheight which is equals to weight of fluid displaced

(ii)This is due to the resulting apparent weight of the object in liquid which is less than true weight

(12c)

Given; mass(m)=500g=0.5kg

Force constant(k)=4Nm^-1

(i)Period (T)=w=sqroot(k/m)

=sqroot(4/0.5)

w=sqroot(8)

=2.83rad/s

w=2*pie*f

w=2*pie(1/T)

2.83=(2*3.142)/T

T=(2*3.142)/2.83

=2.22s

(ii)frequencyf=1/T

f=1/2.22

=0.45Hz

(5a)

Energy is the ability to do work while power is the rate expended

(5b)

Given mass of man(m)=72kg

height(h)=5m

time(t)=40s

p=mgh/t=energy/time

p=(72*10*5)/40

p=90W

(14a)

landa=wavelength

x=wave distance

v=velocity/speed

(14b)

(i)The eye is a natural optical device while camera is artificial optical device

(ii)-Both eye and camera are used as optical device

-Both eye and camera use lenses

14c)

i)Resonance is a phenomenon where by a

vibrating body sets another body vibrating both

having the same natural frequency

ii)Length(L)=45cm=0.45m

L=landa/2

0.45=landa/2

landa=0.45*2=0.90m

v=f*landa

340=fo*0.90

fo=340//0.90

fo=377.8Hz

15a)

i)-its presence gives charge

-its presence bring spark

-its presence bring light

ii)The presence of charge is responsible for moving charges

15b)

i)-it is used for radio turning

-it is used to reduce spark

ii)-Area of over-lap between the plates

-Dustance of seperation between the plates

15c)

Force(Fxy)=1.13*10^11N

(Fzx)=3.60*10^11N

i)Resultant force(Fzy)=R

R=sqroot(Fxy^2+Fzx^2)

R=sqroot(1.13*10^11)^2+(3.60*10^11)^2

R=sqroot(1.28*10^22+12.96*10^22)

R=sqroot(14.24*10^22)

R=3.78*10^11N

ii)tan tita=(3.60*10^11)/(1.13*10^11)

=3.19

tita=tan^-1(3.19)=72.60 degrees

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