Recent content by mia_material_x1

Homework Statement Attached figrue shows an 8.00 kg stone at rest on a spring.The spring is compressed 10.0 cm by the stone. (a) What is the spring constant? (b) The stone is pushed down an additional 30.0 cm and released.What is the elastic potential energy of the compressed spring just...

I would not have come here if I had book answers all along. But thanks for the help

mgH = umgx+umgd H=ux +ud d= (H-ux)/u = [20m-(0.21)(55m)]/0.21 = 40m got it, thank youuu xD

towards positive x, 20° from x ?

180°

180°

tan20°/20m = (55m)i + (-20m)j @ velocity=19.8m/s

I was thinking A(f) = F×S×cos(20°) seems right, but then I get S= - 21m...

I'm not sure... :( Can you enlighten me

if a) is 95m, then what would b) be? :cry::cry:

then what would b) be?

I inserted a photo, thanks for reply!

http://imgur.com/luj32IE 1. Homework Statement A skier starts from rest at the top of a smooth incline of height 20 m as in Figure 2. At the bottom of the incline, the skier encounters a horizontal rough surface where the coecient of kinetic friction between the skis and the snow is 0.21. (a)...

Homework Statement A 60 kg load is raised by a two-pulley arrangement. How much work is done by the force F to raise the load 3 m if there is a frictional force of 20 N in each pulley? Note that the pulleys do not rotate, but the rope slides across each surface. I've solved the problem, I...