Recent content by birdec

Homework Statement I'm doing a statics problem and am following how the solutions manual does it but they skipped a few steps and I'm lost as a result. I have two equations and two unknowns: F and θ (degrees) Homework Equations Equation 1: F*cos(25+θ) = -54.684 Equation 2: F*sin(25+θ) =...

Suppose that X sub 1, X sub 2,... X sub n and Y sub 1, Y sub 2,... Y sub n are independent random samples from populations with means mu sub x and mu sub y and variances sigma squared sub x and sigma squared sub y , respectively. Show that X bar - Y bar is a consistent estimator of mu sub x - mu...

An electric elevator with a motor at the top has a cable weight 4.5 lb/ft. When the car is at the first floor, 198 ft of cable are paid out, and effectively 0 ft are out when the car is at the top floor. How much work does the motor do just lifting the cable when it takes the car from the first...

Hi, I was trying to solve inequalities on my regular TI-89 today and discovered I couldn't! I did solve((x+6)(x-2)>8,x) and pressed enter. Instead of the answer it just spit me back the question. I tried on 2 different TI-89 Titaniums and it worked fine. I called TI tech support and they...