Combined Physics (5116) Aftermath 2008
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1.(a) mass of rock on earth = 0.11 kg
(b) mass of rock on Moon=0.11kg
(c) weight of rock on Moon = 0.176N
2.
Remote control -> infra-red
Satellite TV -> edited: micro waves
Cancer treatment -> Gamma rays
3.(a) draw st. line of grad=8 until 5s (reach 40 m/s)
draw st.line of grad=0 for 15s, i.e. until 20s (at 40m/s)
draw st.line of grad= -5 until 28s (reach 0m/s)
(bi) KE = 1/2 (300) (40)^2
(bii)Force = 1500 N (considering work done or usin f=ma)
4. As dust particles are - charged they are attracted to the + charged metal plate (to the right). unlike charges attract
5. Focal length= 1.8cm
spd of light in glass = 2.0 x10^8 m/s
6.Heating curve (draw), then recall Q
7. Vector and scalar def (recall)
Magnitude = 5N (parallelogram method/ check: pythagora's thm)
8.circuit break- how it works; recall Q
9. 2A, 4A, 2 ohm
essay
10. 1200m
explain how sound is transmitted through water (recall Q)
3 differences btw light and sound
v=f x lamda
12. Recall convection
recall conduction as a slow process
E=pt = (3000W)(60s) =...
$4.80
Suggest : Because water that is heated at the bottom maybe cooled at the top (?) -
i take 5152 syllabus i do every questions except the smoke and dust particle
2 mark let go, dont understand the bloody question.
i tink this paper overall can make it
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I got everything except electricity question (a). If I use my value for (a) and (b) to work out (c), do I get ecf ?
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my teacher said error may be carried forward .
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1.(a) Earth mass = 0.11 kg
(b) Moon mass=0.11kg
(c) Moon weight = 0.176NEarth mass so light meh?
Can type out question let me see?
2.
Remote control -> infra-red
Satellite TV -> Radio waves (?)
Cancer treatment -> Gamma raysSounds correct
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Why may ? I got ecf (full marks) in this kinda scenario in my prelims. /:
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you mean the mass on earth, mass on moon, weight on moon right?
gravity on moon roughly 1/6 of earth. or maybe they just gave it to you.
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1) not literally earth mass, but mass of rock on earth, just lazy type out (edited liao)
2) ecf depends on strictness of marker? not really sure -
Originally posted by eagle:
Earth mass so light meh?
Can type out question let me see?
Sounds correct
they give density 5.5
volume 20cm
mass = 5.5 x 20 = 110g
change to KG = 0.11kg
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Oh, I thought ecf should be agreed upon by all markers or sth. Okay, I'll just pray hard. Radio waves for satellite TV is correct btw. :)
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Originally posted by gunner77:
they give density 5.5
volume 20cm
mass = 5.5 x 20 = 110g
change to KG = 0.11kg
density is 5.5 what?
assuming SI units all correct...then it looks correct.
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Originally posted by Xcert:
density is 5.5 what?
assuming SI units all correct...then it looks correct.
g/cm^3 -
First question can leave in Gram.? 110g.?
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Im sure they want it in kg (mass SI unit), but may be they will accept.
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Originally posted by 慈��:
Oh, I thought ecf should be agreed upon by all markers or sth. Okay, I'll just pray hard. Radio waves for satellite TV is correct btw. :)
But my textbook say mircrowaves leh! Wah sian, careless mistake for the first question, I go put 110KG =.=" Wonder minus how many marks if i got include working. -
Originally posted by Twenty8:
First question can leave in Gram.? 110g.?
most likely they want it in kgunit for mass is kg
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Originally posted by Occam's Razor:
Im sure they want it in kg (mass SI unit), but may be they will accept.
I think they will accept grams cos' they didnt give us the unit, unlike other questions where they did.
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Originally posted by Ferrari_RoXz:
But my textbook say mircrowaves leh! Wah sian, careless mistake for the first question, I go put 110KG =.=" Wonder minus how many marks if i got include working.I also put microwave. Isnt it microwave?
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Textbook says TV satellite is microwave,TV Broadcasting is radiowave...WTF!!
But its seems to be microwave,cause they ask for satellite..
SIAN WRONG LER LAR!
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Textbook ? I also looked at my textbook. Microwaves for cooking in the microwaves. Something like that. o.O I'm quite sure about this.
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Ya, i confirmed with the textbook. Normal Television is radio waves. But satellite television is mircowaves. Heng sia, last min change answer! Too bad my 1st question units wrong.
My focal length I saw 1.9 cm leh. But I scared go put 2cm. Hope its correct. -
ok, I cfm-ed its microwaves not radio waves :(
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me2 cfm is microwaves.but i wrong ><
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lol i put 110N
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Ouch, one mark. Wrong le. >< didin't take note of the satellite thing.