PHYS 3210 Midterm: PHYS 321 UVA Fin2002s
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Answer all 6 questions: you and an assistant are holding the (opposite) ends of a long plank when oops! the butterfingered assis- tant drops his end. W f (hint: use newton"s 2nd law for rotations & linear motion. ) N i= && l (newton"s 2nd law for rotations) (newton"s 2nd law for linear motion) 4: the surface gravity of the moon is almost exactly of the earth"s, and its curva- ture is such that in 1870 meters of forward progress the surface drops 1 meter. The projectile must fall 1 meter for every 1870 meters of forward motion. 1870 m v y t and so v = 1. 69 km/sec: a pendulum consists of a massless rigid rod of length r with a weight of mass m attached to its end. The bob is released from a height h above a table, upon which is resting a block of mass 2m, whose end is exactly be- low the point of suspension.
