Recent content by Physou

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I don't understand : ".. we multiply the time in seconds with c, so the new unit of time becomes the time that light needs to travel a distance of one meter." thank you if you can rephrase this for me !

I guess I am stuck with the arithmetic : if I multiply time in sec. with speed c which is meters over second , how arithmetically do I get a unit of time corresponding to a 1 meter distance ?

I will be very grateful if someone could explain to me the following, in the most simple terms, f being a wave function : " ...f = f(x–ct). Let me explain the minus sign and the c in the argument. Time and space are interchangeable in the argument, provided we measure time in the ‘right’ units...

Thank you so much for your explanation and also for the link .. there are many more hours of reading ahead of me !

I have a basic understanding of the reason why we look for derivative or integration in Physics, based on the water flow example, where integration is the process of accumulating the varying water flow rate "2x" , while we reverse to the water flow rate by differentiating " x squared " the...

Thank you for your insight; division by halves and thirds with a knife has gone ok, I will wait more time to introduce the divided box and the different meaning. Talking about analogies , in south east Asian agglutinative languages the active / passive voice is often not used in spoken practice...

1 chocolate per chocolate is not meaningful, but saying " 6 chocolates divided by halves give 12 halves but divided by 1/2 box give 12 chocolates " is correct ?

Thank you for your interest ! there seems to be indeed 2 ways and 2 different results : with the realistic way of chocolates divided by boxes we are closer to the idea of speed and other things with 2 dimensions; the "forbidden" way doesn't but seems more tempting to use, easier to understand by...

I am following up my 8 years old daughter's homework, and want to show her how division and multiplication work together , such as in division by a fraction : am I right if I say " we divide chocolates by boxes and 6 chocolates divided by half a box means 6 x 2 half boxes = 12 in one box ? " or...

Thank you very much for your help, I really appreciate ! I understand now that length / time squared are the dimensions of acceleration and its SI units are m / s squared

I am self learning Physics From a course I read the following : " .. d^2x/dt^2 = -k/m x The left hand side is an acceleration so k/m must have dimensions of (time)−2 .. " I understand that the left hand is acceleration but why does it imply that k/m must have dimensions of (time)−2 ? I...

If I have a 10 kg box with a content of tightly packed eggs ( or balls etc ) that can collide with each other ( despite the protective paper wrapping them ) and collide with the cardboard of the box, and if this box has higher energy when colliding with the ground than the 1 kg box ( is that...

Thank you , this is clear now !

Thank you for seeing an interest in my question. I am asking this both as part of self teaching physics and as a professional exporter of fragile items. We know that employees at the posts throw the boxes; reinforcing the postal boxes is a solution that is limited by the higher postal cost...