PHYSICS ANSWERS.... GOD BLESS . . . Verified PHYSICS OBJ: 1-10: DABABACBBB 11-20: DCABCBBAAC 21-30: ABBCCDCDBB 31-40: CBDCBCDDAA 41-50: DDBADBDAAB Nos Answered: 2,4,5,7,8,9,10, 11 --------------- --------------- -------- PLS TAKE NOTE OF THESE SYMBOLS: @Means Tita sign whch looks like crossed- zero. ^Means Raise to power . *Means Multiply Degree looks like a small zero. (2.) R=(U^2sin2@)/g 78=(30*30 sin2@)/10 0.8667=sin2@ 2@=60 @=30 (4.) young modulus=stress/ strain stress=F/ A=35000/4=8750 strain=e/ l=0.025/ 50=0.0005 young modulus=8750/ 0.0005=17500000 (5a)Gas can conduct electricity under low pressure and high voltage. (5b)cathode (7a) The minimum energy of the incident ray of the light must be equal to the work function of the material or above the work function of the metal. (7b)(i) polarization. (ii) diffraction. (8a) (i) Rotational Motion I.The movement of the blades of a fan. II.The motion of the wheel of a car. (ii) Linear Motion I.The motion of a boy from a point to another point on a straight line. II.The motion of a ball on a straight course. (8b.) AIM: To determine the density of an irregularly shaped solid APPARATUS: An irregularly shaped solid, a beam balance,a measuring cylinder,a price of thread PROCEDURE: Place the irregularly shaped solid on the beam balance and measured its mass as mkg and place the solid in the measuring cylinder that contains water up to say xm^3 with the aid of the thread.Record the new volume of ym^3. (9)(a) Heat capacity is the quantity of heat required to change the temperature of a substance by 1 k or 1degree Celsius (9b) I. It changes the phase (9d) Given, mass of pepper soup, m=800g =0.800kg Initial temprature of pepper soup, tita =30degree C Power of the microwave oven, P=1200w Time taken, t =3minutes =3*60s =180s. Specific heat capacity of pepper soup, c=4000j/kg k. (9di)final temperature of the pepper soup, @2=? , Heat given by d microwave oven= Heat absorbed by d pepper soup. Pt= mc(@2 - @1), 1200 * 180= 0.8 * 4000(@2 - 30), 216000= 3200(@2 - 30), @2 - 30=67.5 , @2 = (67.5 + 30)degrees , @2 = 97.5degree Celsius NOTE THAT: @ Means tita sign (9Dii) containers with tight- fitting lids are not suitable for use in microwave cooking because there must be room for expansion which can only be catered for if the lids are not tight-fitted (9diii) there is dent on the container because the final temperature was so large compared to the material used in making the container,I.e plastic.and plastics are not very good for such heat.The cooling of the plastic cannot be uniform. (10)(a) The three characteristics of sound are: (i)pitch (ii)quality or timbre (iii)loudness or intensity. Factor on which each of them depends. (i)pitch depends on the frequency (ii)quality or timbre on the harmonics (iii)loudness or intensity depends on the amplitude. (11a.) EMF is the potential difference between the terminals of a cell when it is not delivering any current in an external circuit (11bi)when a steady current flows along a uniform wire, there is steady potential drop throughout its length. thus each unit length of the wire will have a constant P.D. across it (ii)-the potentiometer measures EMF correctly since no correction is needed to be made for the volt lost -it measures the EMF to a higher degree admin #Gturaki may Allah help ol my frnds and soyayyar social network pans that are writing exams.
Posted on: Thu, 19 Jun 2014 08:43:42 +0000
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