Recent content by alexkolb

ok yeh that worked now...! :) i messed up on it because i was adding Ks of both springs for second part of motion, and taking only one spring for first part;, in part a i added Ks so i didnt see why it wouldn't work in part, B, but you are right, its the displacement of each separate spring...

i did it that way took k of 1st spring, times 0.5 squared, and over 2 then add that to k of first and k of second spring, times displacement with 2 springs, 0.268 squared, over 2 it gives about 0.97*10^5J, which is not the ansewr that book gives... book gives 1.68*10^5... i don't...

Problem statement: Trucks have leaf and helper spring (spring put on top of leaf spring vertically) attached to axel. After the leaf spring is compressed by 0.5m, the helper spring helps with additional load. k of leaf spring is 5.25*10^5N/m, and k of helper spring is 3.6*10^5N/m. Load is...

so? nobody has a clue?

Basketball player covers 2.80m horizontally in a jump. His center of mass moves through the space as following: his center of mass is at elevation 1.02m when he leaves the floor, it reaches a maximum height of 1.85 above the floor, and its at 0.900m when he touches down again...

hm, that formula for velocity that u gave, isn't that a formula for velocity in one dimensional motion? can it be used here? its not the straight line that the object is moving at..., its a parabola...

could u please elaborate a little? i don't quite get it, r u saying that vertical component of velocity at 1.85 max height point is 0, and i should use equation Y=Yo+VoT+1/2at^2, where Yo=0, Y=0.83, but i still don't understand how that helps since i don't know Vo and T

Please help, 2D motion problem, projectile movement. Two dimensional motion with constant acceleration problem, please help this is the last one i have to solve and i can't come up with anything. Basketball player covers 2.80m horizontally in a jump. His center of mass moves through the...