puff:lee_yl:[quote=\"nicnac\"]Wood, some float and some sink..
Although both are metals, when your hubby gives you a ring, either a gold ring or copper ring, would you think both are the same?
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puff:lee_yl:[quote=\"nicnac\"]Wood, some float and some sink..
Although both are metals, when your hubby gives you a ring, either a gold ring or copper ring, would you think both are the same?
lee_yl:nicnac:Wood, some float and some sink..
Although both are metals, when your hubby gives you a ring, either a gold ring or copper ring, would you think both are the same?
Sivak222:Agree that ans 2 shouldn't be wrong if base on the p3 material topic tat is being taught. However ans 4 shouldn't be wrong either as there are too many possibility tat 2 same material can float or sink.Even if the solid metal ball can float on water due to surface tension and with precise calculations, say diameter must not exceed 2.6cm, then how can balls Y and Z made of the same material and identical, one end up floating and one sinking?
This question just wanted to test on the P3 material topic, and density is not within the PSLE syllabus.
lee_yl:Even if the solid metal ball can float on water due to surface tension and with precise calculations, say diameter must not exceed 2.6cm, then how can balls Y and Z made of the same material and identical, one end up floating and one sinking?Thanks for the clarify a soaked sponge ball is not consider a solid. Steel solid ball could float on water due topuff:[quote=\"lee_yl\"]I am curious why that school teacher and tutor say it’s choice (4).
Btw, a sponge soaked with water is call a solid+liquid mixture. And can a solid ball be hollow, strictly speaking, no, else we are just playing with words
surface tension with precise calculation. So same material solid ball could sink or float depending on how it is place in the water. This sci qn have too many possibility how to say ans 4 is wrong.
Iluvmygals:The more we discuss about the ball question the more it looked like a PHD entrance exam....not a PSLE.
lee_yl:Thanks for the clarify a soaked sponge ball is not consider a solid. Steel solid ball could float on water due toI am curious why that school teacher and tutor say it’s choice (4).
Btw, a sponge soaked with water is call a solid+liquid mixture. And can a solid ball be hollow, strictly speaking, no, else we are just playing with words
lee_yl:Depends on the definition of same material.Take time to analyse what does choice (4) mean. If it’s neither A nor B then it means that either “all 3 materials are the same” or “materials X and Y different and materials Y and Z same”
I would like to know what materials, when used to fabricate 3 solids (identical in everything), when submerged in water, one piece will float and the other will sink!
lee_yl:Depends on the definition of same material.Take time to analyse what does choice (4) mean. If it’s neither A nor B then it means that either “all 3 materials are the same” or “materials X and Y different and materials Y and Z same”
I would like to know what materials, when used to fabricate 3 solids (identical in everything), when submerged in water, one piece will float and the other will sink!
ski:Some wood sink eg cocobolo EbonyBtw, wood does not sinkfaithj:I think it is 4.
eg. Y and Z could both be made of wood, but Z could be hollow.
ski:Could Z and Y made up of different type of wood?Should be B Only.
X and Y can be different or same materials e.g. both can be iron or X can be iron and Y is glass. There is no way to ascertain. But Z and Y must be different materials e.g. Z is wood, Y is iron.