When you Rollerskate, does it effect the earth by erosion/weathering?

Lift a long object with two points with block and tackle at each poing and rigged to one line at one end of the long object

Can you help me with Penn Foster 038152 graph?

I am waiting for the answer of question number 6 and also i need the answer from the same paper for question number 3

question number 6

canon at an angle 30 degree tube is rotating at an axes with anguar velocities w1 and w2 2 and 5 rad/s and tube blows a ball at b with constant rate 7 m/s . what is velocity and acceleration of ball at tube end ball is at distance of 3m from tube start

canon at an angle 30 degree to x axis tube is rotating at an axes with angularr velocities w1 and w2 2 and 5 rad/s at z and y axes and tube blows a ball at b with constant rate 7 m/s . what is velocity and acceleration of ball at tube end ball is at B which is 3m from tube start

""canon at an angle 30 degree to x axis tube is rotating at an axes with angularr velocities w1 and w2 2 and 5 rad/s at z and y axes and tube blows a ball at b with constant rate 7 m/s . what is velocity and acceleration of ball at tube end ball is at B which is 3m from tube...

it is the same question number 6

suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 26 MPa. It has been determined that fracture results at a stress of 112 MPa when the maximum internal crack length is 8.6 mm long. For this same component and alloy,...