shreyasshree

like Swami Vivekanda said, : Show me!

I am in no position to answer your question scientifically but out of some experience in sports I can tell you that warming up is extremely vital to your stretching. You don't need to warm up for long but little is advisable. For example you could start by mobility exercise; like rotating your arms and torso. If you like you could just jog around or if you prefer you could do it on spot. Warm muscles are much more easily stretched than cold ones, always warm up first to get blood circulating throughout the body and into the muscles. A warm-up should be slow and pleasant. If you don't you might risk tearing or injuring the muscle.

Can anyone tell me some interactive websites that can help me revise my high school science and prepare for exams? Something like khanacademy will be great! And please don't mention any that are NOT free.

So basically, I have to finish my high school science first? Or can I just learn waves, optics and EM and start off ?

Hi I am in high school and really want to learn quantum theory. Is there any way I can begin? Or do I have to finish my high school science before attempting? Are there any free books/ courses/videos that will help me learn?

What about Kno3 + Sugar as a fuel? Will it fly that high?

I am building a rocket and need a way to predict the maximum altitude. Can someone send me some links or explanation? Also, is there any way to measure the thrust of the rocket? Thnx in advance.

Yeah ! I got it today! Thnx. Conformed that what i thought was kind of right!

The book says: The lift is at rest---> weight=mg The lift is moving up or down with uniform velocity---> weight=mg I understood this far. Now, it says that when the lift is accelerating uniformly a)upwards--->weight=m(g+a) b)downwards--->weight=m(g-a) My problem is: Why is it + in a) and - in b)? Thnx