Collins CSEC Physics Workbook Answers A1 Scientific Method
Collins CSEC Physics Workbook answersA1 Scientific method1. a)Time takenfor 20oscillationst/s 15.520.1density of steel(1)80001000(1)e) Relative density of steel density of water23.726.929.832.4 8(1)3.Quantity being measuredInstrument most suitableDiameter of a wireMicrometer screw guageLength l/m0.150 0.250 0.350 0.450 0.5500.651Period T/s0.775 1.005 1.185 1.345 1.490 1.6202Mass of a coinElectronic balance0.601 1.010 1.404 1.809 2.220 2.624(6)3Temperature of boilingwaterThermometer4Electric current flowing ina circuitAmmeter5Period of a pendulumStopwatch22T /s2 2b) T )00.10.2c) Slope change in TSlope 0.30.40.50.6S 4 0.7l/m(10)(1)2change in l2.4 0.40.6 0.1(2) 4.0 s2/md)4. a) 1. May have recorded the length of the pendulumincorrectly, especially if the length is being measuredwith a metre rule from a point other than zero.(1)2. May have used the incorrect time for the period ofthe swing of the pendulum, especially if the timetaken for multiple swings is being measured.(1)b) 1. Find the time for 20 swings and then find the timefor one swing (period).2. Ensure that the distance from the fixed point andthe centre of mass of the bob is measured. Use ametre rule to measure the length of the string and amicrometre screw gauge to measure the diameter ofthe bob.3. Repeat the experiment using different lengths. Foreach length measure the corresponding period.4. Plot a graph of T 2 against l and draw the line of best fit.A2 Vectors(1)39.4g39.4g1. a) A scalar quantity has magnitude only.A vector quantity has magnitude and direction.b) Scalar quantityAny one of: mass, distance, speed, energy, powerVector quantityAny one of: velocity, acceleration, force, displacementc) i) 4.3 Nii) 2.5 Nd) i)(1)4g 39.4g 39.44g 9.85 ms 2(1)2. a) Density is the mass per unit volume.SI unit – kgm 3b) Mass of 1 steel marble in grams 336 33.6 g10Mass of 1 steel marble in kg 33.6 0.0336 kg1000c) Volume of 10 steel marbles 92 – 50 42 cm342Volume of 1 steel marble in cm3 10 4.2 cm3(2)(1)(1)(1)volume 0.0336 64.2 10 8000 kgm 3(1)(1)(1)(1)T90 W4.2Volume of 1 steel marble in m3 1 106 4.2 10 6 m3massd) Density of steel (1)(2)(2)(1)T(1)(1)(3)45 3CSEC Phy WB ANS.indd 305/10/15 4:36 PM
b) Extension/cmii) Using Pythagoras’ theorem (since one of the anglesin the triangle is 90 )W 2 5002 5002(1)W 2 500000(1)W 500000 707 N(1)8.07.02. a)6.05.0ntultaRes5N4.03.060 120 θO2.06N(4)(1)(1)Resultant force 9.5 Nb) 27 1.00A3 Statics1. a)Fundamental quantity SI Unit0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 ondsTemperatureKelvinKc) Slope (10)(1)change in extensionchange in weight8.3 02.5 0(1) 1(1) 3.32 cm Nd) spring constant 1(6)W F d(1) N m Nm(1)ii) Joule(1)iii) P F dtma d t kgms 2 ms 1 kgm2s 3(1)iv) Watt(1)2. a) Moment of a force is the force multiplied by theperpendicular distance from a fulcrum.(2)SI Unit – Nm(1)b) The sum of the clockwise moments about a point (1)is equal to the sum of the anticlockwise moments (1)about the same point.(1)c) i) Sum clockwise moments sum of anticlockwisemoments(1)(20 0.14) (50 0.30) X 0.04(1)17.8 0.04 X(1)X 17.8S b) i)13.32(1) 1(1) 0.301 NcmExtension 85.2 – 80 5.2 cm(1)From the graph, Weight 1.3 N(1)W 1.3Therefore, the mass g 10 0.13 kg (or 130 g)(1)ii) Weight mg 0.060 10(1) 0.6 N(1)From the graph, the extension 2.4 cm(1)e) i)A4 DynamicsVelocity is the rate of change of displacement. ms 1(2)ii) Acceleration is the rate of change of velocity. ms 2(2)b) i) v/ms–11. a) i)120.04X 445 Nii) Total upward force total downward force445 Y 20 50Y 445 – 20 – 50Y 375 N3. a)Mass/g(1)(1)(1)305080100 150 180 2000.10.30.50.81.01.51.82.0Extension/cm 0.41.22.03.24.06.07.28.0(4)30 t/minii) Deceleration (1)10Weight/N0 change in velocitytime taken12 – 0(30 60) 6.67 10 3 ms 2iii) Distance travelled area under the graph 1 (30 60) 122 10,800 m (10.8 km)(3)(1)(1)(1)(1)(1)(1)4CSEC Phy WB ANS.indd 405/10/15 4:36 PM
iv) F ma 3.0 107 6.67 10 3 2.0 105 N5. a) Newton’s first law states that a body stays at rest orif moving continues to move with uniform velocityunless acted upon by an external force.(2)Newton’s second law states that the rate of change ofmomentum is proportional to the applied force andtakes place in the direction in which the force acts. (2)Newton’s third law states that if a body A exerts a forceon body B, then body B exerts an equal and oppositeforce on body A.(2)b) Mass is the amount of matter contained in a bodyOR a measure of a body’s inertia.(1)Weight is the force experienced by a mass when placedin a gravitational field.(1)c) The Newton is defined as the force required to give amass of 1kg an acceleration of 1 ms 2.(2)d) i) Gravitational force due the Earth(1)ii) The tension in the string(1)iii) The friction between the tyres and the road(1)e) i) In order to maintain circular motion(1)an unbalanced force is required to provide theacceleration.(1)This force is provided by the gravitational forceof attraction(1)by the Earth on the satellite.(1)ii) The Earth exerts a gravitational force on thesatellite and(1)the satellite exerts an equal(1)but opposite force on the Earth.(1)(1)(1)(1)2. a) The rate of change of momentum isproportional to the applied forceand takes place in the direction in which theforce acts.b) A force is required for motion.The velocity is proportional to the force.Increasing the force increases the velocity.c) i) Aristotle, F 0Newton, F 0ii) Aristotle, F is constant but not zero.Newton, F 0iii) Aristotle, F is constant and now halved.Newton, F 0(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)(1)3. a) i)Linear momentum is the product of abody’s mass and velocity.(2)ii) In a closed system(1)the total momentum before a collision is equal (1)to the momentum after the collision.(1)b) Since both cars are at rest after the collision,the total momentum 0(1)Both cars have the same mass and are travellingat the same speed in opposite directions.Velocity is a vector quantity so(1)total momentum before collision mv ( mv) 0 (1)Therefore, the law of conservation of momentumapplies.(1)c) Total momentum before collision Total momentumafter collision(1)(0.12 V) (4.5 0) (0.12 4.5) 4.2(1)0.12 V 19.40(1)V 19.406. a) Initial momentum m v 0.01 12 0.12 kgms 1b) time taken to reach maximum height (v – u)a0(1)t (20 – 0)120(1)(1) 0.167 msii) Force m a(1) 500 0.167(1) 83.5 N(1)iii) Distance travelled area under the graph 1 (20 120) (20 380) 1 (20 350)1.2t/s(3)(1)(1)(1)(1)(1)2 12 300iv) Average speed (1)d) Area under the graph between t 0 and t 1.2 s.e) Maximum vertical height 1 1.2 122 7.2 m7. a) 2 ms–1b) v u at 0 (10 3) 30 ms 1 22 1.2 s12Displacement is the distance moved in a stateddirection and is a vector quantity.(1)Distance is a scalar quantity.(1)ii) If a car starts at a point A and travels in a circularpath a distance of 100m(1)and returns to the point A(1)the displacement will be zero.(1)Acceleration (v – u)(1)c) v/ms–1(1)4. a) i)b) i) (0 – 12) 100.12V 162 ms 1(1)(1)(1)(1)Total distance travelledtotal time taken12300850 14.5 ms 1v) Linear momentum m v 500 20 10,000 kgms 1(1)A5 Energy(1)1. a) i) Energy is the capacity to do work.ii) Energy can neither be creatednor destroyed butcan be converted from one form to another.b) i) Electrical energyLight Heatii) Potential energyKinetic energy Soundiii) Chemical energyKinetic energy Heat(1)(1)(1)(1)(1)(1)(1)(1)(1)(3)(3)(3)5CSEC Phy WB ANS.indd 505/10/15 4:36 PM
c) i)Ep mgh(1) 0.1 10 1.2(1) 1.2 J(1)ii) Loss in potential energy gain in kinetic energy(1)1.2 1 0.1 v 2(1)iii) W mg 240 10 2400 Niv) Weight of oil drum 2400 Nv) p ρgh atmospheric pressure (1000 10 0.75) 1 105 7500 1 105 1.075 105 Pa2v iii)2. a) i)ii)iii)iv)v) (2 1.2)0.1(1)v 4.9 ms 1W F d(1)1.2 F 2 10 2(1)F 60 N(1)Work is the force multiplied by the distance movedin the direction of the force.(1)Ep mgh(1) 120 10 0.8(1) 960 J(1)W F d(1) 200 8(1) 1600 J(1)Work is done against friction while the box ismoving up the ramp.(1)Energy is converted into heat and sound.(1)The gain in potential energy must therefore be lessthan the work done by the 200 N force, in orderfor the law of conservation of energy to apply. (1)Efficiency Useful output 100(1) Input960 1001600 60 %4. a) m ρV 1250 (0.18 3.8 10 4) 8.55 10 2 kgb) W mg 8.55 10 2 10 0.855 Nc) mass of fluid displaced ρV 750 (0.18 3.8 10 4) 5.13 10 2 kgUphthrust weight of fluid displaced 5.13 10 2 10 0.513 Nd) Reading on spring balance 0.855 – 0.513 0.342 N5. a) p (1) 5502.2 10 3 2.5 10 Pa2. a) p ρgh 1150 10 45 5.18 105 Pab) Total pressure 5.18 105 100 103 6.18 105 Pa3. a) A body wholly or partially submerged in a fluidexperiences an upthrustwhich is equal to the weight of the fluid displaced.b) i) Volume of water displaced A h 0.32 0.75 0.24 m3mii) ρ Vm ρ V 1000 0.24 240 kg(1)(1)(1)(1)(1)(1)1502 10 4(1)(1)(1)(1)(1)(1)1. a) Heat was an invisible fluid called caloric.(1)Caloric could neither be created nor destroyed andwas present in all matter.(1)Temperature rises due to the addition of caloric.(1)Temperature falls due to the removal of caloric.(1)b) Lack of experimental evidence to show that a hotbody weighed more than a cold one.(1)It was difficult to weigh a hot body accurately whenthe temperature was changing.(1)c) i) Horses were used to turn a blunt drill bit.The drill bit was used to bore a brass cannon. (1)The brass cannon and the brass borings becamevery hot.(1)This heating effect continued as long as thedrilling continued.(1)ii) Thermal energy can be created.(1)Hence it is not a material substance.(1)Thermal energy is produced when work is doneagainst friction, as in the case of the drilling. (1)(2)(1)(2)(1)(1)(1)(1)5(1)(1)B1 Nature of heatA6 Hydrostatics1. a) Pressure is the force acting normally per unit area.b) Pascal Pac) Barometer, U-tube manometer, Bourdon gauge(Any 2)d) W mg 55 10 550 NFP A(1)(1)(1)FA 7.5 105 Pab) p 7.5 105 Pac) F p A 7.5 105 3 10 4 225 1)(1)(1)(1)B2 Macroscopic properties andphenomena(1)(1)(1)1. a) Change in volume of a liquidChange in volume of a gasChange in electrical resistance of a metalGeneration of an e.m.f.Any two (1 mark each)6CSEC Phy WB ANS.indd 605/10/15 4:36 PM
Heat the water and record several correspondingvalues of the length of air column and temperature. (1)The pressure will remain constant provided that allreadings are taken at atmospheric pressure.(1)b) i)c)d)2. a)b)Temperature of pure melting ice(1)Lower fixed point 0 C(1)ii) Temperature of steam above pure boiling waterat normal atmospheric pressure(1)Upper fixed point 100 C(1)Mercury is opaque.(1)Mercury does not ‘wet’ glass.(1)Can measure rapidly changing temperatures(1)Can measure temperatures remotely(1)Gas is made up of many small similar particles(1)moving randomly at high speeds(1)i) Molecules are moving randomly at high speeds. (1)They collide with the walls of the container.(1)They undergo a change in momentum and(1)therefore exert a force on the walls of thecontainer.(1)The force acts on the surface area of the innerFwalls p A(1)ii) As the temperature increases the kinetic energyof the molecules increases.(1)They collide more frequently with the walls ofthe container.(1)There is greater change in momentum andtherefore a greater force is exerted on the wallsof the container.(1)Therefore the pressure inside the 030203.10CopperHeating element–300d)e)f)g)IronThe copper strip expands more than the iron strip whenheated by the heating element;(1)bi-metallic strip bends downwards;(1)electrical circuit is broken;(1)when bi-metallic strip cools it returns to its originalposition.(1)4. a) The volume of a fixed mass of gas is directlyproportional to its thermodynamic temperature,provided that the pressure is kept constant.b)0100200From the graph volume 28 cm3From the graph temperature 270 CThis is absolute zero.Gradient change in volumechange in temperature95 53 1 0.167 cm C300Temp/ C (9)(1)(1)(1)(1)(1)(2)5. a) The pressure of a fixed mass of gas is inverselyproportional to its volume provided that thetemperature is kept constant.(2)b) The pressure of a fixed mass of gas is directlyproportional to its absolute temperature provided thevolume is constant.(2)c) T1 27 273 300 K(1)T2 67 273 340 K(1)p1 190 kPa(2)p1T1190300 p2 AirWaterd)HeatSet up the apparatus as shown above.Record the length of the air column.Record the temperature of the water.–100 300 ( 340 190300p2 215 kPaT1 27 273 300 KT2 67 273 340 Kp1 190 kPaV1 VV2 1.05 Vp1V1T1 p 2V2T2(1)(1)(1)(1)(1)7CSEC Phy WB ANS.indd 705/10/15 4:36 PM
190 V300 1.05 p2V p2 p 2 1.05V340340 190 V300340 190 V1.05V 300p2 205kPaii) E mlf 150 340 51000 Jiii) E mcΔT 150 4.2 25 15750 Jiv) Total energy supplied 3000 51000 15750 69750 JP E(1)(1)(1)(1)B3 Thermal measurements1. a) E mlf(1) 0.08 3.4 105(1) 2.72 104 J(1)b) E mcΔT(1) 0.08 4.2 103 (8 – 0)(1) 2.688 103 J(1)c) Energy lost by lime juice energy used to melt ice energy gained by melted ice 2.72 104 J 2.688 103 J 2.989 104 J(2)d) Energy lost by lime juice mcΔT2.989 104 0.32 c (29 – 8)2.989 10 4c 0.32 212. a)b)c)d)c 4.45 103 Jkg 1 C 1Energy per second 850 4 3400 W (Js 1)Energy absorbed bypot per second 0.65 3400 2210 Js 1E P t 2210 40 60 5.304 106 JEnergy CΔT 8200 75 6.15 105 JEEfficiency Eo 100 6.15 1055.304 106 100(1)t69750690(1) 101 W(1)5. a) Ammeter, voltmeter, electric heater, power supply,oil, lagging, copper block, thermometer, variableresistor (rheostat), stop r(2)(1)(1)c) Energy supplied by the heater IVtEnergy gained by copper block mc (T2 – T1)WhereI – current flowing through heaterV – potential difference across heatert – duration of heatingm – mass of copper blockc – specific heat capacity of copperT1 – initial temperature of copper blockT2 – final temperature of copper blockEnergy suppliedby heater Energy gained by copper block(assuming no heat losses)IVt mc (T2 – T1)c IVt(1)(1)(1)(1)(1)1 (1)(1)(1)(1)(1)(1)(1) 11.6 %(1)3. a) Evaporation is the change in state of a liquid into avapour without reaching its boiling point.(2)Boiling is the process by which a liquid changes into avapour at a particular temperature and pressure.(2)b) Temperature is proportional to the average kineticenergy of all the molecules.(1)The molecules with a high kinetic energy are able toescape from the surface of the liquid.(1)The average kinetic energy of the remainingmolecules decreases.(1)Hence the temperature of the remaining liquid falls. (1)4. a) Specific heat capacity c, is the amount of energyrequired to raise the temperature of 1 kg of asubstance by 1 degree.(2)Heat capacity C, is the amount of energy required toraise the temperature of a substance by 1 degree.(2)b) C mc(1)c) Latent heat of fusion is the amount of energy requiredto change 1 kg of a solid into a liquid without achange in temperature.(3)d) i) E mcΔT(1) 150 2.0 10(1) 3000 J(1)m(T2 T1)(3)(1)(1)(1)(1)d) Insulate the copper block.(1)Repeat the experiment by changing I but measuringthe same temperature change.(1)6. a) Ammeter, voltmeter, battery, heater, stop watch, ice,beaker, retort stand, funnel(5)b)AVHeaterIceWaterc) Energy supplied by the heater IVtEnergy gained by ice mlfWhereI – current flowing through heaterV – potential difference across heater(3)(1)(1)8CSEC Phy WB ANS.indd 805/10/15 4:36 PM
t – duration of heatingm – mass of icelf – specific latent heat of fusion of iceEnergy supplied by heater Energy used to meltthe iceIVt m lflf IVtmC1 Wave motion1. a) i)Wavelength is the distance between two successivepoints in phase OR(1)The distance between two successive crests ORThe distance between two successive troughs.ii) Frequency is the number of cycles per second. (1)iii) Amplitude is the maximum displacementfrom the equilibrium or rest position.(1)b) i) 0.8 cm(1)ii) T 0.4 sf 1(1)(1)(1)B4 Transfer of thermal energy1. a) Conduction, convection, radiation(3)b) Double walled glass with vacuum between – Heat lostby conduction and convection reduced(4)Silvered glass surfaces in vacuum – Heat lost byradiation is reduced(2)2. a) Copper tubes – copper is a good conductor of heat. (1)Blackened surface – black surfaces are good absorbersof heat.(1)Glass – allows short-wave radiation to enter. There-radiated long-wave radiation is trapped by glass. (1)b) Short-wave radiation easily penetrates the glass.(1)The re-radiated waves have a longer wavelength andcannot pass through glass.(1)The radiation becomes trapped and the temperatureincreases.(1)c) CO2 is a greenhouse gas.(1)It behaves like the glass in the glasshouse effect.(1)More CO2 in the atmosphere causes global warmingand can lead to climate changes.(1)3. a) Conduction is the flow of heat through matter froma region of higher temperature to a region of lowertemperature without the flow of matter as a whole. (2)b) Convection is the flow of heat through a fluid froma region of higher temperature to a region of lowertemperature by the bulk movement of the fluid.(2)c) Radiation is the flow of heat from a region of hightemperature to a region of low temperature by meansof electromagnetic waves.(2)4. a) Radiation(1)Vacuum exists between the Earth and the Sun, so (1)conduction and convection cannot occur.(1)b)T(1) 10.4 2.5 Hz(1)iii) v f λ(1) 2.5 1.5 10 2(1) 3.75 10 2 ms 1(1)2. a) i) A progressive wave transmits energy from onepoint to another.(2)ii) A transverse wave is one in which the particles inthe wave oscillate at right angles to the direction oftravel of the wave.(2)iii) A longitudinal wave is one in which the particlesin the wave oscillate parallel to the direction oftravel of the wave.(2)b) A progressive wave – water wave(1)A transverse wave – light(1)A longitudinal wave - sound(1)3. a) Frequency 1T 50 Hzb) V f λ 50 4 10 2 2 ms 1(3)(3)C2 Sound1. a) Stand at one end of a long room.Measure the length of the room using a tape measure.Using two blocks of wood, hit them to makea sound.Record the time taken between hitting the blocksand hearing the echo using a stop watch.Sea breezeLandSpeed of sound (2 length of room)timevb) λ fSea 340250In the day time, the land heats up faster than the sea.Hot air rises above land.Cooler heavier air rushes in from above the seasurface.c) i) Bii) Black surfaces are better absorbers thanshiny ones.d) i) Aii) Black surfaces emit radiation better thanshiny ones.e) Good absorbers are also good emitters of radiation.1(20 10 3)(1)(1)(1)(1)(1)(1)(1) 1.36 m(1)c) d st(1) 340 9(1) 3060 m(1)2. a) In a sound wave the particles oscillate parallel to thedirection of travel of the wave.(2)b) Pitch – frequency(1)Loudness – amplitude(1)c) Light is a transverse wave/Sound is alongitudinal wave.(1)Light travels faster than sound in air.(1)Light can travel through a vacuum/Sound cannot. (1)d) 20 Hz to 20 kHz(2)(1)(1)(1)(1)(1)(1)(1)(1)9CSEC Phy WB ANS.indd 905/10/15 4:36 PM
3. a) Sound waves have a wavelength comparable to thewidth of the door; therefore sound waves diffract onpassing through the doorway and spread out intothe kitchen. Light waves have very much shorterwavelengths, so no diffraction is observed andthe light waves travel in straight lines.(4)b) i) Regions of sound and no sound(2)ii) Interference(1)iii) Waves from S1 and S2 interfere(1)Region of sound – two crests meet andcons
3 Collins CSEC Physics Workbook answers A1 Scientific method 1. a) Time taken for 20 oscillations t/s 15.5 20.1 23.7 26.9 29.8 32.4 Length l/m 0.150 0.250 0.350 0.450 0.550 0.65 Period T/s 0.775 1.005 1.185 1.345 1.490 1.620 T 2/s 0.601 1.010 1.404 1.809 2.220 2.624 (6)
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