PHYS 2101 Lecture : Lecture25
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Monday, march 19, 2012: hw9 due tonight at 11:59pm, of ce hours mwf 12:30-1:30, exam 3 : tuesday (tomorrow night), march 20 @ 6pm in. Lockett 16 (our section: exam 3 covers chapters 10-12. To make a projectile escape from the earth, we must give it an initial velocity larger than the escape velocity. The projectile can escape the earth"s gravitational pull (i. e. never return) if the total energy of the. Earth-projectile system is positive, or if the projectile"s initial kinetic energy exceeds (or equals) the negative of the initial graviational potential energy of the earth-projectile system: (1/2)mv2 > (gmm)/r2. We can eliminate m from this equation, because it appears on both sides, so v does not depend on m. we are left, then, with an expression for v, that depends on. A force f is applied to a dumbbell for a time interval t, rst as in (a) and then as in (b).
