Simple Harmonic Motion: Finding displacement at given time t

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SUMMARY

The discussion centers on calculating the displacement of a 1.10 kg mass on a spring using the equation x(t)=(7.40cm)cos[(4.16rad/s)t−2.42rad]. The correct displacement at t=1.00s is derived by ensuring the calculator is set to radians, resulting in a displacement of approximately 0.0740m. A common mistake highlighted is the confusion between degrees and radians in calculator settings, which can lead to incorrect results. The importance of verifying calculator mode is emphasized for accurate calculations in physics.

PREREQUISITES
  • Understanding of Simple Harmonic Motion (SHM)
  • Familiarity with trigonometric functions and their applications
  • Knowledge of radians versus degrees in angular measurements
  • Basic proficiency in using scientific calculators
NEXT STEPS
  • Review the principles of Simple Harmonic Motion (SHM) in physics
  • Learn how to convert between degrees and radians effectively
  • Practice solving SHM problems using different initial conditions
  • Explore the use of graphing calculators for visualizing SHM
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and oscillatory motion, as well as educators looking for common pitfalls in teaching SHM concepts.

Vanessa Avila
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Homework Statement


A 1.10 kg mass on a spring has displacement as a function of time given by the equation
x(t)=(7.40cm)cos[(4.16rad/s)t−2.42rad].

Find the position of the mass at t=1.00s;

Homework Equations


x = Acos(ωt+∅)

The Attempt at a Solution


I tried to just plug in the time t in that equation to solve for the displacement, but I'm getting 0.074 which apparently is not the right answer:

x = 0.0740m*cos(4.16rad/s(1.00s) - 2.42rad)
x = 0.074
 
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Is your calculator's mode set for degrees or radians?
 
aha! it's in degrees!
gneill said:
Is your calculator's mode set for degrees or radians?
 
Vanessa Avila said:
aha! it's in degrees!
:smile:
 
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gneill said:
:smile:
Thanks a lot lol. I didn't catch that at all. I'm so stupid XD
 
Vanessa Avila said:
Thanks a lot lol. I didn't catch that at all. I'm so stupid XD
Eh. It happens more often than you might think, and to some very clever people, too!
 
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