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 DUISTANCE TIME GRAPH (8)
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) -Soundwave is longitudinal while radio wave is transverse -Soundwave 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 °°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°° ====KEEP REFRESHING====
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