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A2 Physics Unit 4 Jan 2010 Multichoice A2 Physics Unit 4 Jan 2010 Multichoice Mr D Powell

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Raw Marks.... A = B = C = D = E = U =

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Mr Powell 2008 Index C Ft=mv-mu

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Mr Powell 2008 Index B v = 2x10 -4 m 3 s -1 / 7.2x10 -4 m 2 = ms -1 mass per second = 1000kgm -3 x 2x10 -4 m 3 s -1 = 0.2kgs -1 mv = 5.6 x 10 -2

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Mr Powell 2008 Index D Inelastic means that you lose some KE to thermal/sound in the smash But you always conserve mass and total energy and momentum in any collision

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Mr Powell 2008 Index A =v/r = (6400 x10 3 x 2 / 24 x 60 2 )/ (6400 x 10 3 ) D FBI for C

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Mr Powell 2008 Index B

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Mr Powell 2008 Index B Reason out what is happening to M on spring about a point. Time for cycle is down, up past zero to top and down to zero. i.e. 0.5s x 4 = 2s A is only halfway down

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Mr Powell 2008 Index A Why? B – it is in phase C – It is the reverse! D – can happen in chemical or electrical systems as well

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Mr Powell 2008 Index A Changes cancel out

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Mr Powell 2008 Index D Look at idea of velocity in circle v=r Force on moving object in circle is F=mv 2 /r

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Mr Powell 2008 Index B 1.Use formula for gravitation field on Earth. 2.Plug in new case then divide 2 by 1 to cancel all terms and give x 2 y 1 2

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Mr Powell 2008 Index D Think of formula... The gravitational potential (V) is the potential energy (U) per unit mass:potential energy U = mV where m is the mass of the object. The potential energy is the negative of the work done by the gravitational field moving the body to its given position in space from infinity

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Mr Powell 2008 Index A Think of new situation and plug in numbers

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Mr Powell 2008 Index C 1.Work is only done then moving towards or away from electrode. 2.Equipotential means no PD between points 3.Hence no work against the field

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Mr Powell 2008 Index B E-field is uniform D = ½ then V = ½ to cancel

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Mr Powell 2008 Index C E=V/d Field is 1NC -1 Electric Potential is 1JC -1 V d

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Mr Powell 2008 Index C 1.Energy = ½ mv 2 this is converted to potential energy V at point P 2.There is no way that total energy can be zero at this point or it would simply sit there and not reverse direction!

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Mr Powell 2008 Index D

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Mr Powell 2008 Index B CV=Q Q=It CV=It CV/I =t

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Mr Powell 2008 Index D Look at equations Q = CV & E = ½CV 2 Q V, E C Now put in values ratios are 1000: 100 in formula Both come out as 10:1 X:Y

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Mr Powell 2008 Index D F=BIL F = 0.2T x 8A x 0.4m F = 0.64N Electrons = 8 x electrons/m 3 x (1x10 -6 m 2 x 8 x 0.4m) Force per electrons = 2 x N

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Mr Powell 2008 Index C Same plane so no effect B r = mv / Bq r m only correct one!

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Mr Powell 2008 Index A Using formulae for induced e.m.f Rearrange to second line.... (mine complex version!)

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Mr Powell 2008 Index A 1.Conducting Rod of length l moves through magnetic flux density (field strength per unit area) B at constant speed v Distance travelled by rod is v∆t 3.Area of flux it cuts is lv∆t. 4.Magnetic flux = = BA = B x lv∆t 5.Faraday law states e.m.f = ∆ / ∆t = Blv∆t/ ∆t = Blv 6.e.m.f = 1x10 -5 T x 60m x 150ms -1 = 0.09Tm 2 s -1 = 0.09 Vsm -2 m 2 s -1 = 0.09V

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