# need help getting started

by lefthand
Tags: started
 P: 8 this here is the problem.... Use the equations below. (Note that the direction is indicated by the sign in front of the equations.) x = (0.0553 m) cos(4.094t + 0.14π) v = −(0.226 m/s) sin(4.094t + 0.14π) a = −(0.927 m/s2) cos(4.094t + 0.14π) (a) Determine the first time (t > 0) that the position is at its maximum (positive) value. s (b) Determine the first time (t > 0) that the velocity is at its maximum (positive) value. s i have no idea where to start, or how to do this.
 P: 939 Position is given by x. At what angle is the cos(...) maximum?
 P: 8 they didnt give an angle. but I'm guessing since we want x to equal what ever number is there, then cos must equal 1 right?
P: 939

## need help getting started

so (0.0553 m) cos(4.094t + 0.14π) is max when cos(4.094t + 0.14π) = 1

that is when (4.094t + 0.14π) = ....?

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