Attractive force between Venus and Sun

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Homework Help Overview

The discussion revolves around calculating the attractive force between Venus and the Sun using Newton's law of universal gravitation. The original poster presents their calculations and seeks confirmation of their result.

Discussion Character

  • Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculation method using the gravitational force formula, questioning the precision of the original poster's rounding and the inclusion of units in the answer.

Discussion Status

There is ongoing dialogue about the correctness of the original poster's answer, with some participants providing feedback on rounding and unit usage. A comparison with an external source (WolframAlpha) introduces an alternative result, prompting further examination of the values used in the calculations.

Contextual Notes

Participants note discrepancies in mass values for Venus and the Sun, which may affect the final result. The discussion also highlights the importance of proper rounding and unit specification in scientific calculations.

sadifermi
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I just need someone to double check my answer and confirm they get the same answer as I do. Thanks.
Question: Find the attractive force between Vneus and the sun. The distance between their centers is 1.08x10^11.

Equation: F = Gm1m2/d^2
G= 6.67x10^-11 N.m^2/kg^2
m1 (mass of sun)= (1.98x10^30kg)
m2 (mass of venus) = (4.83x10^24kg)
d= (1.08x10^11)

= (6.67x10^-11 N.m^2/kg^2)(1.98x10^30kg)(4.83x10^24kg)/(1.08x10^11)^2
=5.4687 x 10^22

Please let me know if this is the correct answer asap. Thanks!
 
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Your answer has no units.
 
sadifermi said:
I just need someone to double check my answer and confirm they get the same answer as I do. Thanks.
Question: Find the attractive force between Vneus and the sun. The distance between their centers is 1.08x10^11.

Equation: F = Gm1m2/d^2
G= 6.67x10^-11 N.m^2/kg^2
m1 (mass of sun)= (1.98x10^30kg)
m2 (mass of venus) = (4.83x10^24kg)
d= (1.08x10^11)

= (6.67x10^-11 N.m^2/kg^2)(1.98x10^30kg)(4.83x10^24kg)/(1.08x10^11)^2
=5.4687 x 10^22

Please let me know if this is the correct answer asap. Thanks!

You have just omitted the next digits rather than round off to the 5 figures you have chosen to specify.

besides, your answer should only be to 3 figures!

And as per the previous post - you need some units.
 
Thanks folks, appreciate it!
 
WolframAlpha gets a slightly different result: 5.54*10^22 N

It uses a mass of venus which is larger by 1% and a mass of sun which is larger by .5%.
 
sadifermi said:
Thanks folks, appreciate it!

So you should have been saying 5.47 (correctly rounded) not 5.46 (merely truncated)
 

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