Physics 115 Test 2A with key

# Physics 115 Test 2A with key - PHYS115 Spring 2013 1 Test 2...

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PHYS115 g = 9.8 m/ 1 inch = 2 1 pound = 1 pound f Question a. N b. r c. N d. r Answer (a) l Question clock, why a. yo b. th c. th d. th Answer (d) force bigger Question recoils in a. 7 7 b. 7 c. 7 d. 0 5 – Spring 201 /s 2 5.4 mm = 1 lb = 0.454 force = 1 lbf = 1 – What is t N rad/s 2 N/rad rad/s like all forces, th 2 – As you w y does the kn our hand is ju he spring con he spring’s dis he mainspring The more you w r and bigger. 3 – Your 7 kg your arms ba 700 14 m/s 7 2 7 700 (0.005) 700 0.005 0 7 700 0.005 7 13 kg = 1 lb × g the SI unit of c he centripetal fo wind the main nob get harde ust getting tire stant is gettin stortion is get g obeys Hook wind the spring, g rifle fires a 5 ackward at 400 m/s 0.50 m/s 0.050 m/s centripetal fo rce is measured spring of a m er and harder ed. ng bigger tting bigger ke’s law the more it gets 5 gram bullet 1 orce? in newtons (N). echanical wa to turn? s distorted and a t forward with . atch or according to Hoo h muzzle velo Tes oke’s law this m ocity 700 m/s st 2 - 19 April akes its restorin sec. The rifle l 2013 ng

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PHYS115 Answer (c) B momentum momentum bullet bull p m At the same rifle rifle p m The vector s the shot (co If we take th toward the rif 3.5 7 v Question At which a. at b. at c. at d. in Answer (a) Y your swing, points along direction, an that your ap Answer (a) 5 – Spring 201 Before the shot m before the shot m et bullet 0.005 v e time, the rifle m rifle rifle 7 (d v v sum of these tw onservation of m he plus sign (+) t shooter, we get le 0 3.5 4 – As you sw point do you t the lowest p t the top of y t the top of y n the middle o You move back a because that’s w g the chains of t nd, like we said, pparent weight i See Fig. 2.2.6 (a 13 is fired, both the t is zero. After th 700 3.5 kg moves toward yo direction: towar o momenta is th momentum), whi to indicate the d t rifle rifle 7 v v wing back and feel the heav point of your our swing go our swing go of your swing and forth along where you go fa he swing to its p is biggest at the is biggest at the a) and its discuss e bullet and the he shot has been m/s (direction: ou (the shooter) rd shooter) he total moment ch was zero. direction away fr 3.5 0.5 m/s 7 d forth on a p viest? swing ing either for ing backward g going forwa part of a circle ( astest. Here, like pivoting points. S e bottom of you lowest point. Q W th sion in the book. 2 rifle have zero m n fired, the bulle away from shoo ), and has mome tum after the sh rom the shooter playground sw rward or back d rd, but not ye a so called arc). it does all the t So there the fee r swing. You mu
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