Length of Pendulum Homework: Find String Length

  • Thread starter Thread starter cupcakequeen
  • Start date Start date
  • Tags Tags
    Length Pendulum
AI Thread Summary
The discussion revolves around calculating the length of a pendulum string given a mass and its oscillation period. The student initially uses the formula T = 2π√(L/g) but arrives at an incorrect string length. After calculating the period and frequency, they mistakenly reverse the period and frequency values in their calculations. A peer suggests verifying the gravitational constant used, indicating it should be for Earth. Ultimately, the student realizes their error in handling period and frequency, which led to the incorrect answer.
cupcakequeen
Messages
8
Reaction score
0

Homework Statement



A 319g ball is tied to a string. It is pulled to an angle of 7.60 degrees and released to swing as a pendulum. A student with a stopwatch finds that 14 oscillations take 13.0s.
What is the length of the string?

Homework Equations


I have already tried using T = 2pi sqrtL/g, but that does not give me the right answer.


The Attempt at a Solution

 
Physics news on Phys.org
Show your work so we can see what you did.
 
13 oscillations/14 seconds = 1.07 for T, and 1/1.07 = 0.928s for f.
Then I tried T = 2pi sqrt L/g, so 1.07 = 6.28 sqrt L/9.8m/s, then divided each side by 6.28 and got 0.170 = sqrt L/9.8, then squared each side, so 0.029 = L/9.8, then solve for L = 0.2842m, which is wrong according to MasteringPhysics.
 
How far off is your answer?

It looks okay to me. Is the g value for Earth or some other planet?
 
Last edited:
I figured it out...I had period and frequency backwards
 
Thread 'Voltmeter readings for this circuit with switches'

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...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Foucault Pendulum at the North Pole
Replies
9
Views
2K
Tension in the string of a simple pendulum
Replies
4
Views
3K
How much do you need to increase the pendulums length by to
Replies
2
Views
1K
Why Does T^2 Not Directly Correspond to L in Compound Pendulums?
Replies
2
Views
2K
Find the position of a pendulum as a function of time?
Replies
1
Views
2K
Tension in string for a bob pendulum
Replies
11
Views
5K
Rotational Motion of a pendulum
Replies
6
Views
5K
Pendulum experiment systematic errors
Replies
41
Views
20K
Pendulum max gravity acceleration
Replies
5
Views
2K
Pendulum Length and Period Calculations
Replies
6
Views
2K

Hot Threads

Recent Insights

Back
Top