Recent content by ThienAn

To all the engineers or the enginnering students out there. How do you give the definition to one meter (1 m)? More: How much do you weight in Newton, slug, and pound-force (lb_f)?

What are you guys talking about? It is obviously a very vague question. I were born in Vietnam. I speak Vietnamese fluently. Ten out of ten times I won't misspell any world. Plus, French to me is like my English now because Vietnamese people communicate in French, also. But drawn from my...

I were just thinking that if the U.S, North Korea, Russia, China will not find a solution for the wasted nuclear, such as where to put it, this Earth will be in its deepest hole. For eaxmple, mountains nowadays are not availble, oceans cannot simply do, and the vaccumed space is a big cost. So...

Hey, an idea: a delayed-trip to Mars. A joint programm between U.S and other countries would sastify this idea.

There are many things to consider to even begin to build a mission to Mars. First, energy, engine exaust, fluid, oxygen, screws, hovercraft, etc. This is the history repeats itself as the reflection of the Cold War. But, one of the safest way to reduce risks is not to do the rendezvous, and not...

Take a look at MIT, Cornell, UM (College Park), etc. But, before you even consider to work for Nasa, you have to realize that you have to focus on one, and only one particular engineering program. No matter what school you go to, put all the effort into your strengh and make it happen, but if...

You know what i think. I think it is partly right that you are imagining the box and a person. Take a look at this: the resistance of air. When the engine is fired up, inside the engine will become a high pressure environment, whereareas the outside is a lower pressure environment than the...

or i know why they committed suicide is they had eyes. They can see each other' eye color. You should have posted that they are color-blinded, or mute

To me, i believe the question was asked without any appropriate considerartion. No matter if the universe is expanding or contracting, it still is a theory. It is a very elegant question to ask, but it is ultimately wrong to ask. The question should had been: "In where the time is moving...

Where did you even get the world's population is 2 billions. China's population is 2 billions

The U.S Military is a secret to us. I believe what you say earlier, but to launch off an incredible machine like F-22 (Raptor), they will need an incredible afterburner to reach beyond Mach.2, or just even barely break the sound barrier. However, F-22 is a pretty light-weight that packs a bunch...

The problem you are trying to solve is called Demoivre Theorem, or you can solve it by applying Polar and Rectangular Cooordinates (a+bi)

This question has more than 2 answers Ok, first of all: cot (data)= 0. But, cot= cos/sin (data) so, on the Unit Circle there woul be Pi/2 (0,1), and 3Pi/2 (0,-1). And that would make the fuction to be equal 0. However, k is any integer that -Pi/2<data<Pi/2, so data has to lie in QD IV and I...