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Physics OBJ1-10: CBBBCACBBB11-20: BCCCABBCBB21-30: DCDADDBDDA31-40: BDDBBCAABC41-50: ABDABDCBBA=====================Physics Theory(1)Mass = 20g = (20/100)kg = 0.02kgExtension = 5cm = (5/100)m = 0.05mK = 200N/V = ?1/2mvsquare = 1/2kesquareV = rootkesquare/m = root200×0.05×0.05/0.02V = root25V = 5m/s===================================(2a)P – Initial velocity of the projectile B – Angle of projectionH – Maximum height reached by the projectile R – Range or the total horizontal distance covered by the projectile(2b)R=P^2 sin 2beta/gat maximum range sin2beta=1Rmax=P^2/gThis happens at B = 45degree===================================Edited(3)(i)reflection(ii)refraction(iii)diffraction ===================================(4)(i)Magnetic Declination(ii)Horizontal Component of Earth’s Magnetic Field(iii)The angle of Dip or Magnetic Inclination===================================(5a)Free electrons are electrons in a material which can contribute to electric current.(5b)hole is the absence of an electron in a particular place in an atom===================================(6a)Principle of operation of fiber optics state that the density of transparent glass and the refractive index is greater than the density of the two mirrors(6b)(i)it is used to view deep down the throat of a patient(ii)it is used to conveying information=====================Question 4.– Angle of declination– Angle of Dip or inclination.– Horizontal component of the Earth’s magnetic field at that point.====================================Question 8.It states that every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.ii) Gravitational field is a region or space around a mass in which the gravitational force of mass can be felt.b)i. F = Gmm/r^2 —— From Newton’s lawwhere m is mass of earth.m is any mass on earth r is the distance at mass from earthG is a constant at gravitationBut F = Gmm/r^2 = mgi.e Gm/r = g=> g = Gm/r(8di)Escape velocity is the velocity required for an object to escape from a gravitational influence of the earth(8dii)Two differences between acceleration of fall fall (g) and universal gravitational constant (G)Tabulate g | GUnder g>>> (i) it varies(ii) it’s unit is ms^2Under G>>> (i) it is constant(ii) it’s unit is kg^2/Nm^2===========================(9a)Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process. (9aii)(i)surface area in contact with atmosphere(ii)nature of the liquid(9bi)Clay is poorer conductor of heat than plastic(9bii)An increase in pressure in the cooker increase the ambient temperature in the cooker hence the food cooks faster(9c)(i)Change in the state of a substance(ii)Increase in temperature(9di)Heat supplied = m1lvt = m112*40*1400=1.5*1L=12*40*1400/1.5L=672000/1.5= 448,000J/kgLaten heat of fusion of the body = 4.48*10^5J/Kg(9dii)lvt=mc D tita12*40*72=1.5*c*60C=12*40*72/1.5*60C=384J/Kg/KSpecific heat capacity of the body =384J/Kg/K===================================Question 11.a) i. Force is anything that cause motion. its S.I unit is Newton(N) or kgm/s^2ii. – Static friction.– Dynamic Friction.b) i. Draw the diagram.ii) Deceleration during last 5s = 18/5 = 3.6m/s^2iii) Total distance = S1 + S2 + S3 + S4= (30*20) + 1/2(18+30)(6) + (18*10) + (1/2*5*18)= 600 + 144 + 180 + 45= 969metre=============
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