Time Period of pendulum on another planet? Given gravity

  • #1

Homework Statement



9. A simple pendulum on Earth has a period of 6.0 seconds. What would the period of this pendulum be on Jupiter, if the acceleration of gravity on the surface of Jupiter is 26 m/s2

A. 2.3 sec
B. 3.7 sec
C. 6.0 sec
D. 15.6 sec

Homework Equations


T=2pi * sqrt (L/g) Where L= Length of the pendulum

g=grav


The Attempt at a Solution



i know that 6.0s=2pi * (L/9.8) <-since that is the gravity on earth.
and T= 2pi* (L/9.8)

maybe, 6= 2pi * (L/9.8) ? But then ill be solving for L...
i have no idea what to do if any one could please help me/explain the concepts.
 

Answers and Replies

  • #2
olivermsun
Science Advisor
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They're asking you what T would be, so that is what you need to solve for under Jupiter conditions.

What changes on the right hand side when you move to Jupiter?
 
  • #3
maybe sub "6on Earth" somewhere, but i dont know how to word that into a mathmatical form. like present the ratio between earth and jupiter somewhere
 
  • #4
im doing 6= 2pi sqrt(L/26)

6^2=4pi^2 L/26

i keep getting 23. which is not an option.
 
  • #5
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
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The period is 6 sec. on earth. It will not be 6 sec on Jupiter. Don't you have enough information to calculate the period on Jupiter? (Hint: use algebra)
 
  • #6
OKAY, cross multiply, try number 3:

6sec = Xsec x=15.91, which again, is not an option.
/9.8 / 26
 
  • #7
so now i have solved for the LENGTH of the pendulum on earth: L= 6^2/4pi^2 * 9.8

(i think thats right) and used 870, the Length and solved for T on Jupiter.

I get 36.34. Hmm, the squroot of 36.34 is 6. ahhh!
 
  • #8
SteamKing
Staff Emeritus
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In the formula for the period of the pendulum, you have enough data to determine the length of the pendulum based on its behaviour on earth. Taking the same pendulum to Jupiter, where the gravity is higher, what would the period of the pendulum be?
 
  • #9
is the length, 870, correct, you think? at least tell me tHat much. <?>
 
  • #10
thanks everyone for the help! Gotta 100 on the quiz!
 

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