Q&A - PSLE Science

[cccleo]

Does anyone agree to the answer of a question on a theme park ride on page 11,9th post about the circular track ans is below the question.

Please explain I don't understand :scratchhead:

[Too young for old]

Hi. Well, for A and B, it does not nessesarily mean that if the breathing rate increase is greater, the more energy is used up. And if it’s the same, it depends on the body itself. The key word is 'based on the results in the table. No inferrence should be done.

[Too young for old]

I agree cccleo. Okay, to simplyfie it, the higher it is above mid point, the more gp it has than ke. Vice versa, the lower it is from mid point, the more ke than gp

[PSLE 2012]

paranoid:

please help with this question :?: :imdrowning:

http://i48.tinypic.com/2j3ikwi.png\">

Thanks in advance

Dear paranoid, the correct answer should be (1). For A,B, :congrats: both groups will have two animals each.


Cheers! :salute: :xedfingers:

[Clairifina]

I need to clear a doubt. If we want to magnetise a rod, we need to use the north-pole of a magnet to stroke a rod from point A to B. Then, point A will become the north-pole. But what if we stroke the rod with the south-pole? Will point A still be the north-pole or will it become the south pole?

[Too young for old]

South pole

[Clairifina]

Tnx

[Petkwang]

So, final answer is still 3?

[Too young for old]

Does anyone know the ans to: explain clearly why it is dangerous to throw a stapler out the window from the 10 floor?(scientific ans pls)

[Ready2WORK]

I agree with VAL82. However, please correct me if I am wrong.

Copper is not a magnetic material, so therefore, magnetic force is able to pass through it. A is therefore correct.
The magnets were attracted towards the copper sheet, which is also towards each other. As unlike poles attract and like poles repel, the unlike poles have to be facing each other. Also, if noted, the question states that after the magnets were released, which means that the original position of the magnets was shown in the diagram, and when released, one of the magnets swiveled around to face the copper sheet which its north pole. D is thus correct.
So, the answer would be (2).