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Sebuah bola massa 6 kg bergerak dengan kecepatan 7,5 m/s ke kanan menumbuk lenting sempurna bola lain yang bermassa 15 kg yang sedang bergerak dengan kelajuan 3 m/s. Tentukan besar dan arah kelajuan kedua bola setelah tumbukan bila kedua benda berlawanan arah?

Diketahui :

m1 = 6 kg       v1 = 7,5 m/s

m2 = 15 kg     v2 = -3 m/s (kedua benda berlawanan mk salah satu bertanda negatif)

Untuk menyelesaikan soal tumbukan lenting sempurna gunakan :

1. Persamaan hukum kekekalan momentum :

    m1v1 + m2.v2 =  m1v1' + m2.v2'    (akan didpt pers v1' dan v2' yang tdk diketahui)

2. Persamaan koefisien restitusi (tumbukan)

    e = -(v1' -v2')/(v1 -v2)    dengan e = 1 karena tumbukan lenting sempurna

    akan didpt pers v1' dan v2' yang tdk diketahui

Jika kedua persamaan 1 dan 2 disubstitusika akan anda peroleh v1' dan v2'

dengan v1' =  -(45/14) m/s dan v2' = (9/7) m/s

Pelajaran Fisika (SMP) Kelas 11
09-01-2012 Leo
16-01-2012 Winarso, S.Pd

kasih contoh text prosedur ea?????

Recipe for French Toast


You are going to need:


 4 pieces of bread

 1 spoon of sugar

 2 eggs

 A quarter of a cup of milk






Before you start to cook, you have to read the recipe.

Now you can get ready. After you read the recipe, put everything on the counter.

When everything is ready, break the eggs, pour a quarter of the milk in the bowl, then add a small spoon of sugar. Mix the eggs, milk and sugar.

Next, put a piece of bread in the bowl with the eggs, milk and sugar. Turn over the bread.

Now, put some butter in the pan. Turn on the stove. When the pan is hot, take the bread out of the bowl and put it into the pan. After you cook one side of the bread, cook the other side. After you finish the first place of the bread, cook the other pieces. Now you have French toast!


Pelajaran Bahasa Inggris Kelas 9
12-01-2012 andy
12-01-2012 Tri Raharjo, S.Pd

tolong saya dong buk..

advertisement itu definisinya apa ya??

dan beri contohnya 2 buah ya buk

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Pelajaran Bahasa Inggris Kelas 10
09-01-2012 Furqan
12-01-2012 Tri Raharjo, S.Pd

maaf,saya mau tanya..tolong berikan contoh teks hortatory exposition beserta language features dan generic structure-nya serta apa bedanya dengan analytical exposition.terimakasih

hal ini sudah pernah kita bahas , silakan ke arsip jawaban. trimakasih

Pelajaran Bahasa Inggris Kelas 11
06-01-2012 sekar
12-01-2012 Tri Raharjo, S.Pd

tolong buatkan saya text description yang pendek.



Sawahlunto is about 94 km from Padang, 38 km from Batu Sangkar or 137 km from Bukit Tinggi. If you want to go to Sawahlunto, you can start from any of these three places and take a bus, a taxi or join a trip arranged by a travel agency. If you start from Padang, you can get to Sawahlunto in two hours.

If you take a bus from Padang, you will have to pay Rp8.0000. A taxi will cost you Rp. 200.000. If you join a trip, you will have to pay the travel agency Rp 20.000.

At present, The Tourism, Art, and Culture office of Sawahlunto municipality prepares a tourist package called “One day City Tour of sawahlunto”. If you take this package, you will be taken around the town on a tourist train, locally known as dressing, or a tourist bus.

A tourist train is available every day at Sawahlunto station. It starts at 10.00 a.m. and will take you to Muara Kalaban station, which is about 5 km away. This tourist train can accommodate a maximum of 12 passengers and the return fare is Rp. 75.000.

On the way, you can see the tower of the old electric power plant and will be plunged into darkness as you enter the 900-meter-long tunnel.

If you wish to travel by bus, you can charter a tourist bus. It is big enough for 25 people and the charter fee is Rp.250.000 The bus will take you around the old town, visit the living museum, the former open mining pit, and the location of Ombilin Mines Training College (OMTC) and the grave of Prof M.Yamin in Talawi.

When you visit OMTC, you will get information about mining activities through a simulation system of underground mining. You can also visit the geological museum and a coal mining laboratory.

At the end of your tour, you can buy local handicrafts as souvenirs.



Pelajaran Bahasa Inggris Kelas 9
18-12-2011 riyad
12-01-2012 Tri Raharjo, S.Pd

mohn bantuannya

apakah syarat menggambar garis gaya gaya magnet


Pola medan magnet digambarkan sebagai garis gaya magnet yang berupa garis melengkung/kurus yang keluar dari kutub utara magnet dan menuju kutub selatan magnet.

Silahkan coba anda gambarkan!

Pelajaran Fisika (SMP) Kelas 9
08-01-2012 gilang smp n 16 yogyakarta
09-01-2012 Winarso, S.Pd

1.sebuah bola kayu pejal dgn berat 72N dan memiliki jari-jari 0,15 m bergerak pada kelajuan 30m/s sambil berputar total energi kenetik yang di alami adalah..(g=10m/s)

pak tlong di bantu kinah kesusahan menjawab soal yang di ats terima kasih...

Benda yang bergerak:

  • Translasi memiliki Energi Kinetik Translasi Ektrans = 1/2 mv2.
  • Rotasi memiliki Energi Kinetik Rotasi Ekrot = 1/2 Iω2.

Maka benda yang bergerak Rotasi dan Translasi (menggelinding) akan memiliki Energi Total :

Ektotal = Ektrans + Ekrot =  1/2 mv2 + 1/2 Iω2 = ...... (coba sendiri).

Catatan : I = momen inersia bola pejal, dan v = ω.R


Pelajaran Fisika (SMP) Kelas 11
05-01-2012 sakinah
06-01-2012 Winarso, S.Pd

Assalamualaikum.. tolong mnta pnjelasan tentang Analitycal exposition .. dan mnta contohnya yang ada hubungannya atau judulnya tentan "OVERFISHING" .. terima ksh


Social function: To persuade the readers or the listeners that something in the case, to analyze or to explain.
Generic Structure:
1. Thesis (usually includes a preview argument. It introduces topics and indicates the writer’s position.)
2. Arguments (consists of a point and elaboration sequence. The number of points may vary, but each must be supported by discussion and evidence).
3. Reiteration (restates the position more forcefully in the light of the arguments presented).
Language features:
 Emotive words such as : alarmed, worried.
 Words that qualify statements such as: usual probably
 Words that link arguments such as: firstly, however, on the other hand, therefore.
 Usually present tense
 Compound and complex sentences


Smoking in restaurants is just not on.  It must not be allowed because it is rude, harmful to others and dangerous for the smokers.

Firstly, smoking in a restaurant is impolite.  The smell of the smoke affects all people and can turn them off their food.  People pay to taste good food and not to be put off by foul smelling smoke.

Another reason smoking should not be allowed in restaurant is the harm it can do to others.  Passive smoking that is breathing in smoke made by a smoker can lead to asthma attacks and even cancer.

Finally, smoking is dangerous and a health risk to the smokers.  Cigarettes cause heart and lung disease and people should not smoke anywhere, not just in restaurants.

Therefore, smoking in restaurants is impolite, harmful to others and a health risk to the smokers and should not be allowed in any restaurants.



Pelajaran Bahasa Inggris Kelas 12
03-01-2012 Surya kunindar
04-01-2012 Tri Raharjo, S.Pd