PHYSIC OBJ
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1a)A projectile is any object that is cast, fired, flung, heaved, hurled, pitched, tossed, or thrown which continues in motion by its own inertia and is influenced only by the downward force of gravity.
1B-)The horizontal velocity of a projectile is constant because There are no horizontal forces acting upon projectiles and thus no horizontal acceleration
5a)Doping is the process of adding impurities to intrinsic semiconductors to alter their properties
7a)De brogile equation states thatlanda=h/mv where landa=wavelenght of lightmv=p=momentumh=planck's constant
7b)The equation is used to explain the wave-nature of matter
2)
Angle of projection(tita)=30degrees
velocity(u)=150m/s At greatest height, v=0
t=Usin*tita/g
t=(150*sin30degrees)/10
=150*0.5/10
t=7.5s
3) Given original lenght(Lo)=2.00m
radius(r)=1.0mm=1*10^-3m
Extension(e)=25mm=2*10^-3m
Force(f)=10^3N
stress =force/area
Area(a)pie*R^2 =22/7*(10^-3)^2
3.142*10^16m^2
Stress=10^3/3.142*10^-6
=3.18*10^-1*10^3*10^6
=3.18*10^8Nm^-2
Strain=Extension/original length =25*10^-3/2
=1.25*10^-2
Young modulus(Y)
=3.18*10^8/1.25*10^-2
Y-2.54*10^10Nm^-2
4) -By wind
-By increasing the cup surface area
-By reducing the temperature
12a)
Nucleon number is the sum of proton number
and neutron number
12b)
95=c+a
95=c+2
c=95-2
c=93
I)
Number of neutrons in americium-241 is
237-93=144
ii)
a=2, b=4, c=93
12ci)
Gamma ray is not deflected because it has no
charge
12cii)
-It has the highest penetrating power
-it has low ionizing power
12d)
N/Nt=(1/2)^t1/2/T
1/32=(1/2)^(110/t1/2)
5=110/t1/2
5t1/2=110
t1/2=110/5
t1/2=22s
t1/2=0.693/landa
22=0.693/landa
landa=0.693/22
landa=0.0315
landa=0.0315 per year
(8ai)
Uniform acceleration occurs when there is an
equal changein n velocity with equal time
interval no matter how small the time interval
may be
(8aii)
V=wr
V=linear velocity
w=angular velocity
r=radius
(8b)
R= resultant
R=root(F1^2+F2^2)
R=root(30^2+40^2)
R=root(2500)
R=50N
(8c)
This is done to increase the surface friction in
water
(8di)
Given;mass(m)=20kg
angle of inclineation(tita)=30degrees
F=UR
F=Umgcos*tita
ma*sin*tita=Umg cos tita
U=tan*tita
U=tan30
U=0.51
(8dii)
Frictional force(Fr)
Fr=Umgcos*tita
Fr=0.51*20*10*c0s30
Fr=90.9N
9a. Specific latent heart of
vaporization can be defined as the
quantity of heat required to change the
state of a liquid(wata) to gas (vapour) at
constant temperature and pressure.
9bi. Renewable energy sources are:those
that can be replaced as they are used up.
They are continually replenished
9bii.
(i) Biomass
(ii) water energy
(iii) wind energy and
(iv) solar enemy.
9c. Tomatoes kept in a moist jute bag stay
longer because the quantity od heat
required to change the state of solid to
liquid is very low as a result of the
moisture content of the jute bag.
9d. Given that V=0.28 M3 (i.e m square),
(tita)= 25'c (decgree c), Density (p)=
8.00x10 square kg|m sqaure
Specific latent heat of fudion of
iron=1.38x10 raise to power 5 j|kg,
SHC= 460 j|kg|k, tita= 1500'c (degree )
9di.
Total mass of the iron filling=density
x volume from Density=mass/volume, p=
8.00x10 raise to power 3kg|m raise to
power 3, v=0.28m raise to power 3
Therefore: m= 8.00 x10 raise to power 3
kg/ m raise to poer 3
M= 2240kg
: 70% of m= 70/100x2240/1
=1568kg answer
9dii.
Q1= ml tita,Q2.=MC tita. Qr=Q1+Q2
But 10% of the iron filling
=10/100x2240/1=224kg
therefore Q1=2241.38x10 raise to power
5x(1500-25)+224x460x(1500)
=3091200x1475)+(103040x1475)
4.5592x10 raise to power 10+151984000
=4.575x10 raise to power 10j
10ai)
Resonance ia a phenomenon whereby a
vibrating body sets another bodies
vibrating all oscillating at the same neutal
frequency
10aii) 1)Radio-recieving circuit
2)Sets of bob of pendulum
10aiii)
Loudness is the sensation of sound
reaching the ear while intensity is the
ratio of the power to the area
10b)
Wavelenght and speed
10d)
Given;focal lenght(f)=18.0m
Object distance(u)=90.0m
Image height(hi)=1.0m i)
1/u+1/v=1/f
1/90+1/v=-1/18
1/v=-1/18-1/90
1/v=(-5-1)/90
1/v=-6/90 v=-90/6
=-15cm
ii)
v/u=hi/ho
15/90=1.0/h0
ho=90/15 =6cm
Lenght of shark is 6cm
GOODLUCK TO YOU ALL
1AACCCAABDC
11BABAADAADD
21DAAABBACDC
31CDBDBACCAA
41CCBADCCABD
1a)A projectile is any object that is cast, fired, flung, heaved, hurled, pitched, tossed, or thrown which continues in motion by its own inertia and is influenced only by the downward force of gravity.
1B-)The horizontal velocity of a projectile is constant because There are no horizontal forces acting upon projectiles and thus no horizontal acceleration
5a)Doping is the process of adding impurities to intrinsic semiconductors to alter their properties
7a)De brogile equation states thatlanda=h/mv where landa=wavelenght of lightmv=p=momentumh=planck's constant
7b)The equation is used to explain the wave-nature of matter
2)
Angle of projection(tita)=30degrees
velocity(u)=150m/s At greatest height, v=0
t=Usin*tita/g
t=(150*sin30degrees)/10
=150*0.5/10
t=7.5s
3) Given original lenght(Lo)=2.00m
radius(r)=1.0mm=1*10^-3m
Extension(e)=25mm=2*10^-3m
Force(f)=10^3N
stress =force/area
Area(a)pie*R^2 =22/7*(10^-3)^2
3.142*10^16m^2
Stress=10^3/3.142*10^-6
=3.18*10^-1*10^3*10^6
=3.18*10^8Nm^-2
Strain=Extension/original length =25*10^-3/2
=1.25*10^-2
Young modulus(Y)
=3.18*10^8/1.25*10^-2
Y-2.54*10^10Nm^-2
4) -By wind
-By increasing the cup surface area
-By reducing the temperature
12a)
Nucleon number is the sum of proton number
and neutron number
12b)
95=c+a
95=c+2
c=95-2
c=93
I)
Number of neutrons in americium-241 is
237-93=144
ii)
a=2, b=4, c=93
12ci)
Gamma ray is not deflected because it has no
charge
12cii)
-It has the highest penetrating power
-it has low ionizing power
12d)
N/Nt=(1/2)^t1/2/T
1/32=(1/2)^(110/t1/2)
5=110/t1/2
5t1/2=110
t1/2=110/5
t1/2=22s
t1/2=0.693/landa
22=0.693/landa
landa=0.693/22
landa=0.0315
landa=0.0315 per year
(8ai)
Uniform acceleration occurs when there is an
equal changein n velocity with equal time
interval no matter how small the time interval
may be
(8aii)
V=wr
V=linear velocity
w=angular velocity
r=radius
(8b)
R= resultant
R=root(F1^2+F2^2)
R=root(30^2+40^2)
R=root(2500)
R=50N
(8c)
This is done to increase the surface friction in
water
(8di)
Given;mass(m)=20kg
angle of inclineation(tita)=30degrees
F=UR
F=Umgcos*tita
ma*sin*tita=Umg cos tita
U=tan*tita
U=tan30
U=0.51
(8dii)
Frictional force(Fr)
Fr=Umgcos*tita
Fr=0.51*20*10*c0s30
Fr=90.9N
9a. Specific latent heart of
vaporization can be defined as the
quantity of heat required to change the
state of a liquid(wata) to gas (vapour) at
constant temperature and pressure.
9bi. Renewable energy sources are:those
that can be replaced as they are used up.
They are continually replenished
9bii.
(i) Biomass
(ii) water energy
(iii) wind energy and
(iv) solar enemy.
9c. Tomatoes kept in a moist jute bag stay
longer because the quantity od heat
required to change the state of solid to
liquid is very low as a result of the
moisture content of the jute bag.
9d. Given that V=0.28 M3 (i.e m square),
(tita)= 25'c (decgree c), Density (p)=
8.00x10 square kg|m sqaure
Specific latent heat of fudion of
iron=1.38x10 raise to power 5 j|kg,
SHC= 460 j|kg|k, tita= 1500'c (degree )
9di.
Total mass of the iron filling=density
x volume from Density=mass/volume, p=
8.00x10 raise to power 3kg|m raise to
power 3, v=0.28m raise to power 3
Therefore: m= 8.00 x10 raise to power 3
kg/ m raise to poer 3
M= 2240kg
: 70% of m= 70/100x2240/1
=1568kg answer
9dii.
Q1= ml tita,Q2.=MC tita. Qr=Q1+Q2
But 10% of the iron filling
=10/100x2240/1=224kg
therefore Q1=2241.38x10 raise to power
5x(1500-25)+224x460x(1500)
=3091200x1475)+(103040x1475)
4.5592x10 raise to power 10+151984000
=4.575x10 raise to power 10j
10ai)
Resonance ia a phenomenon whereby a
vibrating body sets another bodies
vibrating all oscillating at the same neutal
frequency
10aii) 1)Radio-recieving circuit
2)Sets of bob of pendulum
10aiii)
Loudness is the sensation of sound
reaching the ear while intensity is the
ratio of the power to the area
10b)
Wavelenght and speed
10d)
Given;focal lenght(f)=18.0m
Object distance(u)=90.0m
Image height(hi)=1.0m i)
1/u+1/v=1/f
1/90+1/v=-1/18
1/v=-1/18-1/90
1/v=(-5-1)/90
1/v=-6/90 v=-90/6
=-15cm
ii)
v/u=hi/ho
15/90=1.0/h0
ho=90/15 =6cm
Lenght of shark is 6cm
GOODLUCK TO YOU ALL
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