Recent content by Gattz

Homework Statement A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 210 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the...

Actually I just realized that the square root of az2 + ay2 is the hypothesis. So I guess it makes sense.

Is it something like http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/3D_Vector.svg/555px-3D_Vector.svg.png ? So if it is then wouldn't you have to find the hypotenuse of az2 + ay2 then take that length and find the hypotenuse of that and az?

You mean az for the last one? And to do superscripts, just put "[.SUP] [/SUP.]" without the quotations and periods (caps don't matter). And it's [sub] for subscripts.

If you are given vector a = axi + ayj + azk and you want to find the magnitude of a, then would you just do the square root of ax2 + ay2? If so, then what about az? What is azk actually? I'm a little unclear about it being related to a.

Homework Statement A particle moves along a circular path over a horizontal xy coordinate system, at constant speed. At time t1 = 3.80 s, it is at point (5.10 m, 5.60 m) with velocity (3.30 m/s) and acceleration in the positive x direction. At time t2 = 10.0 s, it has velocity (–3.30 m/s) and...

Homework Statement For the following three vectors, what is -4.00 C·(4.00 A×B)? http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c03/eq03_86.gif" Homework Equations a x b = (a2b3 - a3b2) i + (a3b1 - a1b3) j + (a1b2 - a2b1) k The Attempt at a Solution I've multiplied 4 to each of the...

Haha, no problem. The thing is I have to enter the answers on the computer, but apparently my answer is wrong.

Homework Statement In a meeting of mimes, mime 1 goes through a displacement d1 = (2.79 m)i + (3.53 m)j and and mime 2 goes through a displacement d2 = (-6.75 m)i + (5.3 m)j. What are (a)|d1 × d2|, (b)d1 · d2, (c)(d1 + d2) · d2, and (d) the component of d1 along the direction of d2? Give...

Homework Statement 10(1 + e-x)-1=3 Homework Equations The Attempt at a Solution I'm supposed to solve for x, but I don't know how to go about this. I tried dividing the 3 by the 10, but after that I don't know what to do. I believe I should use ln on both side, but that's after...

Thanks so much physicsface! Great help!

My god, you are right, I made the answer to -4ac to negative. Ok so then the answer for a must be .8seconds. Does that sound too small? Also I found the answer for part c to be 33 m/s.

For part a I did x-xo=vot + 1/2at2. Plugging in I get 85-61.2=24.5t + 1/2(9.8)t2 to get 4.9t2 +24.5t - 23.8 = 0 Okay, that's nice, but when I tried doing quadratic formula, both my times come out to be negative. t = -1.32s and -3.68. What did I do wrong?

Would a = -9.8 or +9.8? Okay I did part b without doing part a if that is possible. First I flipped the problem upside down so the starting point is 0m and the bolt is falling up to 85m so that a = 9.8. I did v2 = vo2 + 2a(x-xo) to find v. So it's v2=0 + 2(9.8)(61.2-0). So v = 24.5m/s. That's...

I believe I'm suppose to neglect air resistance. How could I draw a speed-time graph, if I don't have velocity or time? And what is "u" in the a = (v-u)/t equation?