Recent content by smith5029

hey guys I'm having trouble on these things. ok here it is f(t):3cos^2(5t), the domain is [-pi/5,pi/5]. I have to find the concavity and where the curve increases and decreases. I took the second derivative and got the inflection point at .157. I have no idea where i am going...

i don't see how u got 3 and 15 ??

Yes i determined the second derivative as -12x + 78. Then using the second derivative rule plugged in 15, and -2 telling me that -2 was a local min and 15 was a local max. DO you know if 15, -2 are the only critical points in my problem?

hi guys I'm stuck on this, i keep thinking i have the right answeres but i can't get them. the function is f(x): -2x^3 + 39x^2 - 180x + 1 i need to list all of the critical points, and hten indicate where it is increasing and where it is decreasing. I set the derivative -6x^2 + 78x - 180...

the question wants to know what the force of the cables question is, and the length isn't defined but you can cancel it out right?

it wants to know the force of the cables tension, the length isn't defined but we can get it out right?

A wrecking ball (weight = 5400 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3800 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the...

A wrecking ball (weight = 5400 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3800 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the...