Aplane stress element has σ,-4750 psi, σ,-1200 psi, and τ,-950 psi ccw. a) draw mohr's circle. b) find the principal stresses and show them on a sketch of a properly oriented element c) find the maximum shear and show them on a sketch of a properly oriented element that shows the orientation of the maximum shear stress planes and all other stresses acting on those planes

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?