desday,September 25,2018 Problem 1: Multiple Choice 130 points] For each of the
ID: 1883012 • Letter: D
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desday,September 25,2018 Problem 1: Multiple Choice 130 points] For each of the following questions, circle the letter(s) corresponding to the best answer(s) from the options given. Each question is worth 5 points: partial credit will be given for those problems asking you to "Circle all that apply." a) [6 pts] In which of the following scenarios can the system be treated as isolated (or functionally isolated)? Circle ALL that apply... The system is: A) A hockey puck sliding on a smooth, horizontal icy surface (ignoring friction and air drag). B) A hockey puck sliding down a smooth, icy ramp (ignoring friction and air drag). C) A rocket drifting in outer space, far from any other objects. pace, far from any other objects. The rocket then sprays some g in order to make the rocket move (note that the gas is part of the system). E) The moon orbiting in a circle around the Earth. (consider the moon alone as the "system F) A person in free fall toward the earth (ignore air drag)Explanation / Answer
A)a hockey puck moving horizontally ignoring air resistance here no external forces are acting on the system.momentum is conserved
E)The moon and earth together form a system and only gravitational forces is acting between them and no other external force is acting ,only internal gravitational force .momentum is conserved
In an isolated systemthere are no external forces; the system is isolated. The total system momentum would be expected to be conserved.
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