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(1a)
Acceleration(a)=change in
velocity/time
Velocity=displacement/time
V=L/T
V=LT^-1 a=LT^-2
(1b)
Presssure=force/Area
P=F/A
F=ma=MLT^-2
P=MLT^-2/L^2 =ML*L^-2T^-2
P=ML^-1T^-2
(1c)
Density=M/L^3
=ML^-3 (2)
Initial velocity(u)=42ms^-1
Angle(tita)=30degrees
H=u^2sin^2(tita)/2g
H=42^2*sin^2(30degrees)/2*10
H=42*42*(0.5)^2/20 H=22.05m (3)
Mercury does not wet glass
because the cohesion
of mercury to glass is greater
than adhesion of
water to glass (4)
Gradient=(30-12)/(F-10)
={12- 8 }/ {10-5}
18/(F-10)=4/5
4F-40=90
4F=130 F=130/4
=32.5N (5a) Tensile stress is the ratio
of load or force(F)
to its cross-sectional area(A). It
is measured in
Nm^-2 or N/m^2. (5b) Young modulus is the ratio
of tensile or compressive stress
to compressive
strain. It is demoted by E and
measured in N/
m^2 or Nm^-2(S.I unit) (6)
Charge(q)=1.6*10^-19C
Potential difference(v)=1.0*10^5V
Energy(E)=1/2qV
E=1/2*1.6*10^-19*1.0*10^5
E=0.8*10^-14 E=8*10^-15J (7)
-Electron diffraction
-Compton effect
-Optical spectra (8a)
(i)Relative motion is the motion
of a body say A
in reference to another body
say B
(ii)Velocity of the car =80km/hr-60km/hr
=20km/hr (8b)
(i)force is the push or pull on a
body and
anything that makes a body to
move (ii)Contact
force;push,tension,reaction
Field forces;gravitational
force,electrostatic
force,magnetic force
(8c) DRAW THE DISTANCE TIME GRAPH
total distance travelled(s)=15m
(a)
a=change in v/change in t
=v1-v0/t1-t0
1=v1-0/2-0 1=v/2
v=2m/s (b)
15=(1/2*2*2)+(2*(x1-2)+(1/2*
(x2-x1)*2)
15=2+2x1-4+x2-x1
15=x1+x2-2
x1+x2=17(eq1) a=(0-2)/(x2-x1)
2=-2/(x2-x1)
2x2-2x1=-2
x2-x1=-1(eq2)
x2+x1=17(eq1)
2x2=16,x2=8s x1+x2=17
x1+8=17
x1=9s
Total time =2+9+8=19s (10a)
-Sound wave is longitudinal
while radio wave is
transverse
-Sound wave is mechanical while
radio wave is elecromagnetic (10b)
It is louder because the tension
imposed on its
stem (10c)
(i)
-The two waves must have the
same amplitude
-The two waves must have the
same frequency (ii)
-They must emanate from
different sources
-The must super-imposed (iii)
-Light must travel from optically
densed
medium to less dense medium
-The incidence angle must
exceed the critical angle (9a)
(i)Electrical energy to mechanical
energy and then
heat energy
(ii)wind energy to electrical
energy (9b)
-A narrow stem
-A uniform bore
-A liquid of high thermal
expansivity
(9c) This is because heat gained by
hot water in the pot is
not lost to the surrounding and
the clay pot is a poor
conductor of electricity
(9d) Mass of water (m) =0.4kg
Energy(E) = 210kJ
mc(tita1-tita2) = ml + mc
(tita2-tita1)
0.4*4200*
(60)=0.4*3.3*10^5+0.4*2100* (tita2+60)
100800=132000-840(tita2+60)
31200=840(tita2+60)
37.14=tita2+60
tita2=37.14-60
tita2=-22.86 degree.
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07066531599 Physics Obj 1-10: BCBDBCCCCA
11-20: DBBCCCACBD
21-30: CBCDCDADDA
31-40: BACDDBCCDC
41-50: CADCADDBAC 07066531599