This is a gordon rule question Q#2 (a) How can a rocket change direction when it

Question

This is a gordon rule question Q#2 (a) How can a rocket change direction when it is far out inspace and is essentially in a vacum? (b) A bungee jumper momentarily comes to a rest at the bottomof the dive before they spring back upward. At that moment,describe the bungee jumpers velocity, acceleration,and whether ornot they are in equilibrum? (c) Suppose that a grandfather clock( a simple pendulumdevice) is running slowly . The time it take to complete each cycleis lomger than it should be. should one shorten or lenghten thependulum to make the clock keep the correct time? .Why? This is a gordon rule question Q#2 (a) How can a rocket change direction when it is far out inspace and is essentially in a vacum? (b) A bungee jumper momentarily comes to a rest at the bottomof the dive before they spring back upward. At that moment,describe the bungee jumpers velocity, acceleration,and whether ornot they are in equilibrum? (c) Suppose that a grandfather clock( a simple pendulumdevice) is running slowly . The time it take to complete each cycleis lomger than it should be. should one shorten or lenghten thependulum to make the clock keep the correct time? .Why?

Explanation / Answer

a) The rocket can burn fuel and turn the exhaust gas in onedirection. This means that the gas particles gain velocity in onedirection. Because the initial momentum of the system is zero, byconservation of linear momentum, the final momentum of thesystem also has to be zero. Thus, the rocket will move in theopposite direction... b) At the lowest point, all the jumper's kinetic energy ismomentarily converted into the bungee cord's elastic potentialenergy. Thus, the jumper's velocity is zero, and acceleration is zero.However, the system is not in equilibrium as the tension in therope does not balance the weight of the jumper, causing him to moveupwards again. c)time period of a pendulum is given by: T=2L/g thus T is directly proportional to L so if one wants to reduce the time period(i.e make it go faster),then one should reduce the length.

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