BOBO%̕XdHHHHHH%48H%̔ #%̍Z- Judy DavisjFLOM!`|x(HHR[ (hh t2 HK'dE6Mz %̎l@/b %40%4H/H/%4b%̌%  %̖ [^yDSETr554%̔%̔%̔8%̍%:(&`%:$    $ 5 6     4 5 6  % ' K `     ^ _ ` a b c d * + , - . / 0        c d e f g h i Z#6   %̔%;8PHY 1151 Fall 2002 Second Hour Exam October 23, 2002 1. A particular roller coaster has a loop with a radius of 20 m. What is the minimum speed the coaster can have at the top of this loop so that passengers just loose contact with the seat? 2. In loading a certain dart gun, a 50 g (0.050 kg) dart is pushed in 12 cm (0.12 m) before the gun is cocked. A force of 20 N is required at the end. Find the following: a) the spring constant k of the spring. b) the total amount of energy stored in the spring. c) the speed of the dart when it leaves the gun. 3. A 600 g glider moves on an air track with a velocity of 10 cm/s to the right while a 400 g glider moves to the left with a velocity of 20 cm/s. The two collide totally inelastically. What is their common velocity after the collison? 4. A uniform pole 6 m long weighs 300 N and is attached by a pivot at one end to a wall. The pole is held at an angle of 30 above the horizontal by a horizontal guy wire attached to the pole 4.0 m from the end attached to the wall. A load of 600 N hangs from the upper end of the pole. Find the following: a) the tension in the guy wire and b) the components of the force exerted on the pole by the wall. 5. Concept Questions: i) Consider a car that travels along a circular track at a constant speed. What do you know about the net force on the car? ii) Jupiters mass is 300 times greater than Earths mass. Yet you would only weigh 3 times as much if you were on Jupiters surface compared to your weight here on Earths surface. Why is that? iii) What does it mean to say a force is a "non-conservative force"? And give a common example of "non-conservative force". iv) Distinguish between momentum and kinetic energy. Or, what is the difference between momentum and kinetic energy? Or, compare and constrast momentum and kinetic energy. v) What are the two conditions of equilibrium? 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