Recent content by titaniumpen

This is a very simple question. Does a larger f-stop lead to an image with a higher resolution? The reason why I think so is that with a larger f-stop (f-stop=f/D), the focal length will be greater, and because the image height is proportional to the focal length when the object is at...

I managed to read 1/4th of it before the final exams last school year. I may finish it some time later. I remembered being fascinated by it, but frankly I can't remember much of the content itself.

Thanks for the article! I'm still in secondary school but I'm already considering a career in physics (but of course a lot can change). My parents advice me against following the academic route after graduate school, since I'll have to do post-docs with very low salaries, and it's nearly...

Like you said, the bar is allowed to expand freely. However, if it isn't (e.g. stuck between two pillars) the bar cannot expand at all. There's a force acting on the bar, and that force causes thermal stress.

Thanks a lot for the reply, I think I have the concepts clear now. It's a great feeling! Thanks! :D

Thanks for the replies! I didn't know the answer is so simple. :smile:

Thanks for the reply! However, what do you mean by equilibrium? I thought you can never achieve equilibrium with the atmosphere, since in the end the atmosphere is so big you can never saturate it with vapor. Another question is, would boiling become very difficult if it happens inside a very...

After hours of reading and googling, I still do not really understand how boiling works. I have some questions: What I know is that boiling occurs when the vapor pressure is equal to the atmospheric pressure. But I thought that vapor pressure is the pressure exerted by the water vapor...

I was reading about the Carnot engine, and I stumbled upon this forumla: Carnot efficiency = 1 - (QH-QL)/QH = 1 - (TH-TL)/TH Where QH is the heat input, QL is the heat output, TH is the input temperature, TL is the output temperature. The book says that TH is proportional to QH, and TL...

Is the initial velocity 14.7 m/s^2?

The radial acceleration has to point towards the center of the circle. If you use Pythagoras Theorem the resulting acceleration will probably point somewhere else. If you have to use Pythagoras Theorem then you'll need to find the values of tangential acceleration and the net acceleration...

Is the solution wrong? How is the angle of the rope related to the tangential acceleration anyway? Edit: Whoops I didn't read the question.

Since you don't have the temperature of the surroundings in space (it varies greatly depending on the position of the Sun), I'll just assume you're finding out the rate of heat loss of the pizza, not the NET rate of heat loss. So ignore the temperature of the surroundings and use the formula...

Just thinking, when you drop a single drop of water into a body of water you get ripples, not a single ripple. That's because the water at the contact point goes up and down. Is it possible to create a single circular wave? That will make it easier to observe the behavior of a single wave in a...

I was looking at it a few hours ago, and I realized that you have to interpret the two wires as a series circuit. Then you told me that the second wire is the return path. Now everything makes sense. :D