Answer this if you know your physics?

  • Context: Undergrad 
  • Thread starter Thread starter Ian
  • Start date Start date
  • Tags Tags
    Physics
Click For Summary

Discussion Overview

The discussion revolves around various physical constants and forces, specifically focusing on the electric and gravitational forces between a proton and an electron, as well as the velocities and densities of certain entities. It includes calculations and estimations related to these constants.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant provides values for the electric force between a proton and electron, the gravitational force between them, the velocity of light, the permittivity of a vacuum, and the densities of a proton and the sun.
  • Calculations are presented for the ratios of these values, specifically the electric force to gravitational force, the square of the velocity of light to the square of the permittivity, and the cube of the density of a proton to the cube of the density of the sun.
  • A later reply suggests that the question regarding the similarity in order of the answers is flawed, arguing that the selection of the proton and sun is arbitrary and that similar ratios could be derived from any two objects.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the validity of the question posed about the ratios of the calculated values, with one participant challenging the premise of the question.

Contextual Notes

The discussion includes assumptions about the relationships between the selected physical constants and entities, and the implications of using arbitrary selections for comparative analysis are noted but not resolved.

Ian
Messages
88
Reaction score
1
Q1. What is the magnitude of the electric force between a proton & electron?
(8.238x10-8 N)
Q2,What is the magnitude of the gravitational force between a proton & electron?
(3.63x10-47 N)
Q3.
What is the magnitude of the velocity of light?
(299792458 m s-1)
Q4.What is the magnitude of the permitivity of a vacuum?
(8.854x10-12 m-2 s-2)
Q5. Estimate the density of a proton
(1.78x1016kg m-3)
Q6. Estimate the density of the sun
(1405 kg m-3)

Q7. Divide answer 1 by answer 2.
(2x1039)
Q8. Divide the square of the third answer by the square of the fourth answer.
(1x1039)
Q9. Divide the cube of the fifth answer by the cube of the sixth answer
(2x1039)
Q10. Why are the answers to Q7, Q8 & Q9 of the same order?
(Gotcha)
 
Physics news on Phys.org
Sorry, I posted this twice in error.
 
Ian said:
Q1. What is the magnitude of the electric force between a proton & electron?
(8.238x10-8 N)
Q2,What is the magnitude of the gravitational force between a proton & electron?
(3.63x10-47 N)
Q3.
What is the magnitude of the velocity of light?
(299792458 m s-1)
Q4.What is the magnitude of the permitivity of a vacuum?
(8.854x10-12 m-2 s-2)
Q5. Estimate the density of a proton
(1.78x1016kg m-3)
Q6. Estimate the density of the sun
(1405 kg m-3)

Q7. Divide answer 1 by answer 2.
(2x1039)
Q8. Divide the square of the third answer by the square of the fourth answer.
(1x1039)
Q9. Divide the cube of the fifth answer by the cube of the sixth answer
(2x1039)
Q10. Why are the answers to Q7, Q8 & Q9 of the same order?
(Gotcha)
I'm thinking Planck units here. But since your selection of proton and sun is purely arbitrary and the two aren't fundamentally related in any way, I could pick the density of any two objects and come up with the same ratio if I wanted to and ask the same question you're asking so I think your question is faulty
 
Q11. The number of fingers on my hands
(10)
Q12. The number of even primes (1)
(1)
Q13. Divide the 39th power of the eleventh answer by the 39th power of the twelfth answer.
(1039)
Q14. Why is the answer to Q13 the same order as the answers to Q7, Q8 & Q9?
A14. Because I ignored units in the ratio as did the OP in the answer to Q8.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
3K
Replies
2
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 28 ·
Replies
28
Views
5K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 19 ·
Replies
19
Views
3K
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K