Dimensions related to Planck's constant H

AI Thread Summary
The discussion revolves around deriving new quantities from the fundamental constants: the speed of light (C), Planck's constant (H), and the mass of the proton (M sub p). For part A, the correct combination to yield dimensions of length (L) is H/(M*C), while for part B, the combination for dimensions of time (T) is H/(M*C^2). The original poster expressed confusion but ultimately confirmed their calculations were correct. Additionally, they sought further assistance on a separate topic regarding FCC fraction packing in a pyramidal structure. The thread highlights the collaborative nature of learning in physics forums.
ODBS
Messages
5
Reaction score
0
Consider a system where the three fundamentally important quantities are the speed of light C with dimensions (L)/(T), Planck's constant H with dimensions (M)(L)^2/(T), and the mass of the proton M sub p with dimension (M).
a) What combination of ratios and/or products of C, H, and M sub p will yield a new quantity of dimensions (L)?
b) What combination of ratios and/or products of C, H, and M sub p will yield a new quantity of dimensions (T)?


I have no idea how to figure this out. I am brand new to physics so any help would be greatly appreciated. Could you please solve the question and walk me through how you found the answer? I am a very literal learner and I need to see the answer along with how you found it.




This is what I came up with, not sure if it's correct:

(C^a)*(H^b)*(M^c)

L^(a+2b)=L----> a+2b=1
M^(b+c)= 1-----> b+c=0
T^(a-b)=1---->a-b=0

a=-b
b=1
a=-1
c=-1

(C^-1)*(H^1)*(M^-1)=H/C*M

-a-b=1
a+2b=0
b+c=0
b=1
a=-2
c=-1

So, H/M*c*c


part A= H/M*C
part B= H/M*C*C
 
Physics news on Phys.org
:approve: yes, you are correct...I checked it myself. Cheers :smile:
 
Thank you! I've asked another question about fcc fraction packing for a pyramidal structure. Can you take a look at it and help me out? I'm really lost on that one.
 
ODBS said:
Thank you! I've asked another question about fcc fraction packing for a pyramidal structure. Can you take a look at it and help me out? I'm really lost on that one.

I would've if I myself had any clue!:-p I am a student myself, I am not proficient with that topic!...I am sure others will help out! :smile:
 
Thread 'Struggling to make relation between elastic force and height'
Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Back
Top