Q&A - PSLE Science
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superksmum:
Robertpattinsonidle:
![](\"http://i46.tinypic.com/2wqhj80.jpg\")
http://i46.tinypic.com/2wqhj80.jpg\">
[b] tom inflated the balloon until it burst. state energy changes that occurred
elastic potential ?????????????? sound+kinetic energy
___________ >____________>__________?
The answer is:
Elastic potential energy (of the balloon)> kinetic energy( of the air in the balloon)> sound energy(popping of balloon).
(confirmed by DD's school science teacher).
But the scene did not described the balloon will stretch till burst. -
NY1969:
superksmum:
[quote=\"Robertpattinsonidle\"]
[b] tom inflated the balloon until it burst. state energy changes that occurred
elastic potential ?????????????? sound+kinetic energy
___________ >____________>__________?
The answer is:
Elastic potential energy (of the balloon)> kinetic energy( of the air in the balloon)> sound energy(popping of balloon).
(confirmed by DD's school science teacher).
But the scene did not described the balloon will stretch till burst.[/quote]
The question was \"Tom inflated the balloon until it burst. state energy changes that occurred\". Key words are 'stretch until burst'. Although the picture didn't state, but the question did. -
Can anyone advise me what is the difference between heart rate and breathing rate?
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I like the ans provided by vksm for the leaves coated with oil. But i cant click the like button. Dont know why.
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superksmum:
Robertpattinsonidle:
[b] tom inflated the balloon until it burst. state energy changes that occurred
elastic potential ?????????????? sound+kinetic energy
___________ >____________>__________?
The answer is:
Elastic potential energy (of the balloon)> kinetic energy( of the air in the balloon)> sound energy(popping of balloon).
(confirmed by DD's school science teacher).
That was my answer exactly. But ans key says no kinetic energy but it is heat energy for the second blank!!
Thanks
robertpattinsonidle ft.JB -
Can anyone tell me the difference between community and habitat?
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cccleo:
Can anyone tell me the difference between community and habitat?
Hi,
A population: Same species live and reproduce in a particular place. Must have at least two species. E.g. Butterfly and caterpillar
A community: different populations that live together in a same habitat (area)
A habitat: place where a population lives -
Robertpattinsonidle:
superksmum:
[quote=\"Robertpattinsonidle\"]
[b] tom inflated the balloon until it burst. state energy changes that occurred
elastic potential ?????????????? sound+kinetic energy
___________ >____________>__________?
The answer is:
Elastic potential energy (of the balloon)> kinetic energy( of the air in the balloon)> sound energy(popping of balloon).
(confirmed by DD's school science teacher).
That was my answer exactly. But ans key says no kinetic energy but it is heat energy for the second blank!!
Thanks
robertpattinsonidle ft.JB[/quote]
I think it is wrong. How is heat energy involved? -
![](\"http://i48.tinypic.com/142y5ue.jpg\")
The question is from the PSLE booklet Pg 50. My DD's answer is similar with the answer key which i think is wrong.However, the teacher did not explain what is the correct answer. :imdrowning:
Thanks. -
Bookwrappers:
Can anyone advise me what is the difference between heart rate and breathing rate?
Heart rate and breathing rate are interlinked. Heart rate is usually to measure how strenuous the activity is. Breathing rate is to measure the intake of oxygen. Both are about respiration.
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