Recent content by Pandemonium

As far as I understand, X-rays from outer space that reaches Earth are mostly absorbed by the atmosphere. That's why most cosmic X-ray detectors are out there in the satellites so as to collect more data.

I don't quite get what you want... So are you asking help to give questions/clues that point to the answer "plutonium"? Or in another words, do you want information on "plutonium"?

I've not experimented with the Wilberforce Pendulum before, so I cannot tell you anything, but what I suggest is to try goggling "Wilberforce Pendulum". I tried that, and it gave me quite a number of links, though most are no more informative than the one above.

For the first question, since you're told to assume constant acceleration, the question becomes a simple kinematics question. At t = 0, u = 0. At t = 6.2s, s = 10m. Apply your kinematics equation. With the first part, you can get the acceleration of the mountain climber. Then, you should next...

Here's some help I hope will assist you in arriving to the answer. Understand that, horizontally, there are three forces on block 2. Two of them are frictional force, the other is the applied force. Let the mass of block 1 be m. Now, what is the frictional force between the two blocks, and...

Most of the similar experiments I've seen is to use data loggers and motion sensors. That is the simplest way of finding the terminal velocity. However, if you don't have the luxury of such apparatus, you can always use the stopwatch method, measure the time taken over a vertical distance once...

I know the general policy of this forum is that we do not give answers to homeworks, but I'm not so sure about quizzes/competitions. I've tried goggling "RCS angle" and it fetched a whole wealth of answers. Maybe you can try that or something similar?

Light can go around a corner to a small degree by diffraction, but in your case I doubt this is so, because from what you described, it sounds like the laser has to make a 90° turn. I don't know what this advertisement is trying to sell, but if it's something like a detector, then it could be...

I think this originated from a study, which claimed that much of the environmental problem such as global warming would be solved if the moon is blown up. Well, I think it's quite hard to say when if we blow up the moon, especially with so many different pieces of rock flying all over the...

In which direction? Down, I presume? And also, I assume that air resistance is negligible. From the data given, I just need the mass of the baseball, the gravitational acceleration, and the height it reached. Then, just use the Conservation of Energy. The part before the ball being whacked by...

-- Tom D Well, first thing I've to point out is that childlike and childish have similar meanings, much very different connotations. Obviously, the second one is rather negative, but definitely not the first. Personally, I wouldn't really say that our science is primative or childlike, but...

In Reply To Tom D Well, according to the article, it says that these gas bubbles 'had the potential to cause aircraft to crash'.

I'll try and assist you in constructing the free body diagram. For the elevator question, here's a hint: according to Newton's 3rd Law, the force on the elevator from the cable is equal to the tension in the cable. The force on the elevator due to the cable is pulling it upwards, while...

Hmmm... I've never thought of that. I don't know...

Alternatively, you may want to consider applying the principle of equivalence. When we make a turn, the centrifugal acceleration we experience is directed away from the centre of the turn. Now, using the principle, we can also think it as if we are not moving/turning at all, but there's a...