Recent content by spj1

I have a question asking for the period, frequency, amplitude and phase angle from simply looking at a graph. I have the period and frequency, and 'think' i have the amplitude (high point - low point / 2), but I don't know how to get the phase angle. No equation is given so I can't simply...

The problem: sin(t) - cos(t) can be rewritten as ? - The answer is sqrt(2)cos(3PI/4 - t). there is an equation Re^(xt)cos(bt - angle). R = sqrt(A^2+B^2) So i get the following answer: sqrt(2)(cos(t - 3PI/4)). Why does the correct answer have the 3PI/4 switched with the t??

Car travels up 10% grade at constant speed of 35 m/s. The car is 2000 kg and requires a total force of 600N on a regular, flat incline. What is the power required to get up the grade? P=FxV %10 percent incline = arctan(.1)... theta = 5.7, so the displacement would be about...

Thanks, but you've went a little over my head. We haven't covered anything but the basic equations. To be honest, it seems like there's something missing in the question. Either the total height needs to be given or the velocity...

1. A flower pot falls out of a window and past the window below (ignore air resistance). It takes the post .42 s to pass this window, which is 1.9m high. How far is the top of the window below the windowsill from which the flowerpot fell? answer: .31 m 2. v = v0 + at x = x0 + v0t...

Thanks to everyone who posted. 40 m/s was the total acceleration and after reading the posts my biggest problem was assuming that 2.5 s was the time it took to reach the top.

This free fall problem seems simple, but I can't get it. you have a rocket fired from rest with an acceleration of 40 m/s^2. It runs for 2.5 and then falls. I'm wanting to find the maximum height, which I think would require me getting the initial velocity first. v = v0 + at 0 = v0 + 40(2.5)...