Search found 6 matches

Fri Oct 14, 2011 10:52 pm
Forum: High School Physics
Topic: Why night sky dark?
Replies: 1
Views: 13205

Why night sky dark?

If there are so many (so many that it can be considered infinite) number of stars, then the night sky should be bright.
Even though the speed of light is finite, that still doesn't make sense.
Wed Sep 28, 2011 11:05 am
Forum: High School Physics
Topic: Feedback from the article 22 April, Sydney Morning Herald,
Replies: 10
Views: 27176

Re: Feedback from the article 22 April, Sydney Morning Herald,

This is quite a shock to me.
In my home country, there was almost no essay writing test on physics in high school. We were exposed in applying and deriving various law of physics to solve particular problems. In fact, I think the calculation in uni is still too basic.
Sat Jul 02, 2011 12:43 am
Forum: Physics Questions
Topic: Warning Shot.
Replies: 2
Views: 6261

Warning Shot.

Police officers when trying to give warning shot, they shot straight up in the air. Is this a good idea? What goes up must come down. It won't happen to the officer who shoots, cos when it gets to the top, the wind will change the vertical position of the bullet. There was an experiment where they f...
Sat Jul 02, 2011 12:24 am
Forum: Physics Questions
Topic: Quite Interesting.
Replies: 6
Views: 12491

Re: Quite Interesting.

angle.alpha wrote:That is definitely not true if you are using SI units....
Please note that when someone measuring gold, or any precious metals, especially silver and gemstones, troy weight is used.
Sat Jul 02, 2011 12:11 am
Forum: Physics Questions
Topic: Quite Interesting.
Replies: 6
Views: 12491

Quite Interesting.

When I was a little kid, someone had asked me a question. What's heavier a ton of gold or a ton of feathers? At first I answered gold but later I've been told that they were actually in balance. A ton of something is weighted a ton of something. Nothing could be further than the truth. One of them I...
Fri Jul 01, 2011 11:50 pm
Forum: Physics Questions
Topic: Does Higher Temperature Water Freeze Faster?
Replies: 12
Views: 12073

Re: Does Higher Temperature Water Freeze Faster?

Well, I learned something today.
If you want to make ices, use hot water.