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Wednesday, July 29, 2009

cars, bikes etc in india

some links to websites with information / review on used cars, new cars , bike review in india,like maruti 800, maruti alto, ambassador, hyundai santro, cielo, tata nano, tata indica, karizma, bajaj pulsar, ford fiesta, honda city etc

Interesting information on bikes seems to be available at bikeadvice.in
The website seems to be in the form of a blog . Information on carburetor tuning, engine oils etc is available. review/information on some bikes from yamaha , karizma, suzuki , honda , bajaj pulsar etc seem to be available

Another website with review on cars bikes / two wheelers etc is gaadi.com.
Information on price of new cars, as well as of used cars seems to be available.

some other websites with information on new and used cars are

automobileindia.com

cardekho.com

carazoo.com

carwale.com


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.

finding area using green's theorem

The area enclosed by a plane curve C can be evaluated using the following integral

for the proof refer the following page





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Sunday, July 19, 2009

hair oil

In Kerala, people used to use plain coconut oil heated/treated with hibiscus or some other spices as hair oil.
Some of the women had very long hair. But then they started to cut down the length of their hair just like males.
So I think their concept of use of hair oil also has changed with time.
But now you can buy varieties of hair oil, perfumed etc in bottles, small pouches etc. with attributes like non greasy, non sticky, stops hair loss, adds vitality to your hair, gets rid of dandruff, herbal hair oil, almond drops hair oil, amla hair oil, leaves hair soft, silky and shiny etc.
But I do not know what is the difference between the old hair oil and the new fangled ones except the cost and ease of buying and using .


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Thursday, July 16, 2009

some silly things

Is it possible to lose a lot of weight in a single week through exercise ?
Does the cockroach have a bizarre odour
Why do some clothes smell mouldy even after they are washed ?
Is practicing hard for football worth it ?
How does a shy boy talk to a girl he has just met in class ?
Why do people try so hard to participate in the auction of bsnl vanity cellphone numbers ?
Is buying a used car better than buying a new car even if you have ready cash for the new car?


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Tuesday, July 14, 2009

mobile cell phones vs landline

In the old days, the only telecom company in India was BSNL, the government controlled entity.
There was no mobile network. Only landlines were present. Getting a telephone connection was a long process. You applied for a connection and waited for something like months before you got a telephone alloted to you.

But now with the arrival of cell phone companies , getting a phone connection is a lot easier. You just go to a phone shop (or even some other general stores) with a passport size photo and copies of identification documents like voter id etc, and you can buy a sim card which is usually activated then itself on receipt of the identification documents by the shop keeper.

some of the networks in kerala are idea ( earlier bpl mobile or escotel ? ) , bsnl cellone, airtel, tata indicom

ideacellular.com

bsnl.co.in

airtel.in

tataindicom.com

There have been problems with call congestion on certain networks during peak usage hours. There are also complaints about billing on post paid services of some service providers. There are also some problems with unwanted promotional messages, advertisement calls etc.

In kerala mobile phones have become very common place. Even people earning very little money like casual labourers , auto drivers etc use mobile phones (usually cheap mobile handsets with black and white display) to keep in touch with their clientele.
Some college students carry around two or three mobile phones. Students seem to be searching for the latest and hottest mobile phones. Sometimes this kind of mobile phone usage seems to develop into something like an addiction. There was even an incident when some student committed suicide apparently because his parents enforced some ban on his cell phone usage.

There also have been safety concerns on the use of mobile phones by very young children.
Some governments have banned the use of cell phones in schools and some universities like anna university in tamilnadu have banned the use of camera phones in engineering colleges during class hours.

Using a mobilephone while driving is very dangerous since the reaction time may be slower.

Some of the qualities to look for in a mobile phone seem to be ruggedness ,durability, memory, camera quality in case of a phone with camera, texting ease, should fit easily in ones pocket etc.


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Monday, July 13, 2009

digital cameras

In the old days you had cameras which used film, It was very costly to develop the film and print it out. The capacity was also small.
Nowadays there are digital cameras where the capacity can be expanded using memory cards. You can review the photos on the screen or on a computer, use software to make the photos prettier and print them out on special photo paper (slightly more expensive than ordinary paper)

some of the common brands are jvc , kodak, epson, canon , hitachi, nikon, panasonic, philips, sony, benq etc

jvc.com

digitalcameras.kodak.com

usa.canon.com

benq.com/products/digicam

I use a simple kodak camera, and sometimes wish that i had bought one which can be fitted with extra lens for taking photos of objects a little far away.





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conditional identities in trigonometry

conditional identities in trigonometry are usually based on A,B, C being angles of a triangle or A + B +C = π

examples

If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

explanation of If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

If A+B+C=π, prove that: sinA+sinB+sinC = cot(A/2).cot(B/2) [sinA+sinB-sinC]

explanation





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Sunday, July 12, 2009

radius of curvature

find the radius of curvature of y = exp(-x) at x =1

y' = -exp(-x)

y" = exp(-x)

at x = 1

y' = -exp(-1)= -1 /e

y" = exp(-1) = 1/e

radius of curvature = { [ 1 + (y')² ] ^(3/2) } / y"

radius of curvature = { [e² + 1] ^(3/2) } / e²

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Saturday, July 11, 2009

gensets

In the old days for marriages rececptions, they would keep petromax lamps on hand in case the current went out.
Later on they started renting out generators which usually ran on kerosene or petrol , usually starts up on petrol and runs on kerosene, and were very noisy. The starting up of the generator was also quite hard with having to pull a cord to turn the flywheel? .
But now a days you can see generators in most shops due to the worsening power situation with power cuts and so on. Most of them are self starting as in they will start when you turn the key
In some of the big offices / banks you can see big generators which are of the size of a small room with huge mufflers to cut down on the sound. Even the small generators now are relatively silent when compared to the old ones.


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Friday, July 10, 2009

microwave oven

Recently we have been looking around for a microwave oven since there have been many advertisements for microwave ovens from LG, Samsung, IFB whirlpool etc. After looking around it seems that the microwave oven from bajaj is pretty good considering its cost of around Rs. 5000/- . We mainly use the oven to heat up food like puffs etc bought from the bakery and sometimes rarely to bake cake.
Only after buying the microwave oven did we notice that it is not good to put metal vessels inside the microwave oven . Even some types of glass vessels cannot be used in the microwave oven.


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pressure cooker

In Kerala, pressure cookers are usually used to cook idili, rice, meat, vegetables for sambar etc.
In our house we recently bought a new prestige pressure cooker. The older one also was a prestige pressure cooker which was around for a very long time .
Spare parts seem to be readily available. The only thing that has been replaced from time to time is the gasket. Here we take the old gasket to a shop in Chalai near east fort, and the shopkeeper gives a new gasket by comparing the size with the old one.
Other brands commonly available seem to be Hawkins, Premier pressure cooker etc



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Wednesday, July 8, 2009

cable vs dth service

We had been using cable tv from asianet for many years. Initially it was for one tv and the cost was around Rs.180/- which was later increased to around 200 rupees.
They had introduced a set top box and digital service. But we did not change over to that.
Then we asked them for an extra connection for another tv which increased the charge to around 285 rupees. The only problem was that now and then some of the english channels like star world,some sports channels etc would just disappear for some months .

Then the age of dth channels came around with doordarshan dth service ddinews.gov.in, dish tv dishtv.in , tata sky tatasky.com airtel dth airtel.in, suntv dth sundirect.in etc.

We opted for tata sky in addition to the cable service .
We selected the package which consisted of most of the south indian channels, sports channels , english movie channels, music channels etc. In those days there were also radio channels from all india radio on tata sky.
But after a few days the radio channels just disappeared from tata sky.
Then one by one most of the sports channels and some other channels started to be moved into other packages for which the subscriber had to pay extra money. Most of the repackaging of sports channels would happen when there was some cricket match or series likely to be watched by indians.


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driving test in trivandrum, kerala

Before taking the driving test you have to get a learner's license.For that you had to to take an objective test on the computer in the RT office. The questions that are asked correspond to important trafic signs, traffic rules etc. Books are available that contain model questions (usually in malayalam). But I was able to find an online version of the model questions in english.

After passing the test you are given a date after several weeks to appear for the driving test which consisted of taking a H test (driving the car in a particular pattern between iron stakes arranged in the shape of an H ; you go forward along one of the vertical lines of the H from bottom to top , then reverse to the middle , go in reverse along the centre horizontal line of the H , and then to the opposite bottom of the other vertical line of the H in reverse , then forward to the top of that vertical line , then reverse to the middle of the vertical line, then in reverse along the central horizontal line of the H and then in reverse along the first vertical line to the starting point. )and a short driving test on the road to test the gear shifting and hand signals.

My father taught me driving in his old petrol ambassador car (amby). But before going for the driving test, father advised me to take the test in a maruti 800 which is smaller and hence might make it easier to take the H test.
So we went to a driving school. The maruti 800 had the gear lever on the floor as opposed to the gear lever on the steering column of the ambassador I practiced on.
So we paid the driving school for a couple of hours of driving practice on the road and for practice of the H test using the Maruti 800.

The teachers at the driving school were very helpful. For those who had trouble taking the H test smoothly, they gave some pointers like stopping and taking the 90 degree turns based on sighting the iron stakes at certain points relative to the car's rear window quarter glass etc.

They also raise/adjust the fuel flow to the engine during idling for the test so that the engine does not shut down frequently in the hands of the amateur drivers.

Anyway the whole exercise was fun. I got the receipt of passing the driving test, but had to wait some days for the actual license since there was some problem with the printing machine in the RT office at that time

More details on the eligibility conditions , forms and documents , fee , requirements for renewal , international drivers licence etc is available at the kerala motor vehicle department website
 keralamvd.gov.in .



The following diagram may have errors



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Tuesday, July 7, 2009

problem on trapezoidal rule

evaluate integral of sinx from 0 to pi using trapezoidal rule with n=10

take a=0 b = pi, h = (b-a)/n = pi/10

break up the interval 0 to pi into subintervals of length h = pi/10
evaluate y = sinx at the endpointsformulae




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Monday, July 6, 2009

answers

1. b
2. c
3. a
4. a
5. b
back to questions 1 to 5

explanation




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practice questions for various entrance exams


Answers and some explanation









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