Mac hotter, strange sound, and internet browser "not responding"

Dear Mac experts and users,
I bought my MacBook (OS X 10.4.9) in January, 2007.
Recently, some following problems happened that I would like to ask you for helps.
1. The battery sometimes stops charging at 97% power until power supply was cut and recharged.
2. As a cycle of about 20 min, the machine sounds "ton...ton" like a small sound caused by a finger flicking on a lastic sheet. The left side of the computer become hotter during working time.
3. I can not open a website containing a Java application or server like 3-D molecule shows or sonething like that although Java Web start .app and other Java plug-ins are available in the Mac Library. I have re-installed the latest Java updates from Apple but the situation is not improven.
4. When I open a site with much data like a whole genome sequence from GenBank, FireFox completely freezes, Safari slows down and machine become noisy with sound like its fans.
That's all I feel think torubles to my Mac. Please share with me your experiences and tell me what should I do.
Thank you!
Hua
  Mac OS X (10.4.9)   MacBook/Intel Core 2 Dual 2.0 GHz/RAM 1.0 GB/HDD 80 HB

Hi Vliet, Philsmith, and others,
Thank you for your kind suggestions.
My MacBook is equiped with a RAM of 1 GB. There is still 53 GB free in the HDD. Usually, using Activity Monitor to check, I see that free memory during working time is small (less than 100 MB) but with a not much percentage of CPU used.
I have a version of OnlyX installed and run in my computer. Could you please show me any kind of Hardware Test application?
Best regards,
Hua

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