A ball is thrown straight upward. Neglecting air resistance, what initial up-
ward speed does the ball need in order to remain in the air for a total time of 10 sec be- fore it is caught at the initial point of release?

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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.

Why do some scientists and archeologists think that volta was not the first person to build a battery