when an athlete presses a 115kg barbell from his chest to a distance of 0.71m above his chest, he does blank of work

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.

How is the ideal mechanical advantage of a wheel and axle calculated?

If we compare the force of gravity to strong nuclear force, we could conclude that