Simple harmonic motion, finding displacement given time

[scholio]

Homework Statement

mass = 1.8kg
given equation in problem x(t) = (7.40cm)cos[(4.16s^-1)t - 2.42]
*when i tried solving i converted 7.40cm to 0.074m

find the position of the mass at t = 1.00s

Homework Equations

x(t) = (7.40cm)cos[(4.16s^-1)t - 2.42]

The Attempt at a Solution

i've been working on this problem for a while, i haven't been able to get the correct answer, even when i made sure to check units and make necessary unit conversions. i made sure my units were in radians (within the cosine) but it keeps yielding the wrong answer, i was able to find velocity and acceleration from the given equation, just not position.

i thought this problem would be just plug and chug, when i stuck t=1.00s it still hasn't given me the correct answer, i got -0.01 and 0.074, both were incorrect

thanks

 

[scholio]

EDIT sorry for double posting - actually was kinda correct the first time, it was just very picky with sig figs, i initially entered -0.01 which was incorrect, the actual answer was -0.0125

 

[Moetasim]

for any help!

I would suggest double checking your calculations and making sure all units are consistent. It is possible that there may be a small error in your calculations that is causing the incorrect answer. It may also be helpful to try using a calculator or computer program to solve the equation, as it can be more accurate. Additionally, it may be helpful to plot the equation on a graph to visualize the motion and see if the result makes sense. If the issue persists, it may be helpful to consult with a teacher or classmate for further assistance.