Recent content by kp87

k thanks a lot got it :)

Homework Statement A 75.0 kg horizontal beam is supported at each end. A 275 kg piano rests a quarter of the way from one end. What is the vertical force on the support closest to the piano? What is the vertical force on the support farthest from the piano? Homework Equations Tcw=Tccw...

Homework Statement Find the tension in the two wires supporting the 36 kg traffic light shown in Fig. 12-57. (Assume that 1 = 52° and 2 = 38°.) http://img15.imgspot.com/u/07/77/15/952alt.gif Homework Equations -T1cos(52)+T2cos(38)=m*g T1sin(52)+T2sin(38)=0 The Attempt at a...

1) I did 16.5/sqrt((6.1^2+4.6^2+6.3^2)(8.2^2+2.3^2+(-7^2))=712.93 arccos(16.5/712.93)= 83.67 is that right?? 2) 49.05 is the acceleration and the final velocity will be 0 so i squared the initial velocity which is 31

Homework Statement 1) Calculate the angle between the following vectors. A = 6.1 i + 4.6 j + 6.3 k and B = 8.2 i + 2.3 j - 7.0 k. 2) What should be the spring constant k of a spring designed to bring a 1320 kg car to rest from a speed of 116 km/h so that the occupants undergo a...

thx a lot :0

A horse canters away from its trainer in a straight line, moving 140 m away in 10.0 s. It then turns abruptly and gallops halfway back in 4.9 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the trainer" as the positive direction...