Recent content by rpgnick85

t = (vf - vi)/a so (38.3-17)/9.8 unless i used the wrong formula

I used Vf = Vi + a*t with Vf = 38.3, Vi = 17, a = 9.8 and came up with t = 2.17 but that is the incorrect answer for when the rock hits the ground. The rock went up at a starting point of 60m, then came down past 60m to hit the ground.

Homework Statement A rock is thrown vertically upward with a speed of 17.0 from the roof of a building that is 60.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? Homework Equations I used v^2 = vinitial^2 + 2a(y - yinitial)...

We don't have the mass of the head. I set Yleft and Yright to 2.30 and solved for Xleft and Xright in which I got 1.075 and magnitude of 2.54 for each direction (after left = sqrt(x^2 + y^2). That answer was wrong. But the resultant magnitude is 2.30N and the resultant angle is 90 degrees...

Good place to start, I am guessing 1N is the downforce due to gravity and that will help me find the horizontal and vertical forceS?

I did the vertical force at 90 degrees by 2.3N. The left diagonal force I did 115 degrees and the right diagonal force I did 65 degrees. I am having trouble finding the magnitude of the left and right forces. I tried (2.3)^2 = sqrt(x^2 + x^2) I did x^2 twice because of two equal forces...

I need to find the magnitude of the left pulling force and right pulling force. The upward resultant is 2.30N and 90 degrees? The angle of the left is 115 degrees and angle of the right is 65 degrees not sure N force though.

found the answer- was in the wrong quadrant

or if someone could point me in the right direction i have no idea where to begin

alright so when i use -18cos37 and -18sin37 for my Bx and By values respectively and 12cos180 and 12sin180 for my Ax an Ay values I am coming up with R= 28.5126 and θ=22.33° which is incorrect

-Bx = -Bcosθ -By = -Bsinθ Does that mean that I would do -18cos(217) for my first value?

Homework Statement Sketch the vector difference D = A - B I have found F = A + B. Homework Equations A(x) = AcosTHETA A(y) = AsinTHETA B(x) = BcosTHETA A(y) = BsinTHETA R = sqrt(rx^2 + ry^2) The Attempt at a Solution As opposed to the F = A + B I have tried changing the...

Homework Statement Q: Make a scale drawing showing both the forces produced by the cables and the resultant force. Estimate the angle carefully or measure it with a protractor. Supplement: A person with an injured jaw has a brace below his chin. The brace is held in place by two cables...