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Quiz3-11amSolutions - Physics 1Al Quiz#3 10 am class Before...

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Unformatted text preview: Physics 1Al Quiz #3. 10 am class Before starting to answer questions bubble in your student ID# and test version number (A,B,C, or D on the bottom of this quiz page on your scantron form. If you do not bubble in this info your quiz will not be graded. For numeric answers two significant digits is enough. More digits is also 0k. A small range of answers near the correct answer will be accepted. Use scientific notation (with "E" to indicate a power of ten) when needed. Note, however, that 3.1E-2 and 0.031 will be accepted as the same answer. Mark a minus sign when needed to indicate a negative value. DO NOT TO FORGET TO MARK (decimal points) and 'E" (when using scientific notation) on scantrons Name Turn in this test form with your scantron form and also have your ID card out and ready to be checked. Using notes or books, or calculators which store notes or formulas is not allowed. Talking or looking at other students' tests is not allowed. 1) Which of the following four statements is NOT true about mass—spring systems 1) A) A stiffer spring has a higher spring constant k B) The spring force is in a direction opposite the displacement from the unstretched/ uncompressed position C) The stiffer the spring in a mass—spring system the slower the oscillation D) The amplitude of oscillation of a mass—spring system is the maximum displacement from the unstretched/ umcompressed position E) All of the above statements are true 2) Which of the following four statements is NOT true about numeric solution of an equation ol 2) motion A) A numeric solution can be found regardless of whether an equation of motion has an analytic solution or not B) The acceleration can be calculated from the force C) The change in velocity can be calculated from the acceleration D) The change in position can be calculated from the velocity E) All of the above statements are true 3) Which of the following four statements is NOT true about energy 3) A) It can be converted from one form to another B) It can be transferred from one object to another C) Newtons times meters is a unit of energy D) Work energy transferred to an object equals the change in kinetic energy of the object B) All of the above are true 4) Which of the following four statements is true? A) If a battery has higher ”power" that means it stores a larger amount of energy 4) B) If an object is moving at 10 m/ s and is slowed by friction to 5 m / s then all the kinetic energy is converted to heat energy C) 1 Watt is 1 Newton times one 1 meter divided by one second D) When heat energy is transferred to an object the change in temperature is proportional to the mass of the object E) All of the above statements are false 5) A 10 g bullet is fired into a 10 liter water tank (note that 1 liter = 1 kg of water) and comes to a stop in the tank due to friction forces (fluid drag). If all of the bullet's energy is transferred to the water and the water increases temperature by 0.1 degree celcius, what was the initial velocity of the bullet when it entered the water tank? Express this velocity as a positive number in m / s (i.e., assume the bullet is moving in the +x direction). The specific heat capacity of water in MKS units is 4200 1/ kg /“C. 6) A mass—spring system has mass m=l kg and spring constant k=10 N/ m, Assume that the spring force is the only force acting on the mass. If the unstretched/ uncompressed position is x:0, the initial position at time t:0 is 0.2 m and the initial velocity is zero, what is the velocity at time t=3 5? Express the answer in m/ s and include the sign of the velocity (positive if moving in the +x direction, negative if moving in the -x direction). Tip: make sure your calculator is set to calculate trig functions in radians, not degrees. 7) Suppose a bungee cord acts like a spring with a spring force F=—Cx3, with C22 in MKS units. Neglecting any effects of friction and gravity, what is the work (energy required) to stretch the bungee cord (once moving at constant velocity) from x:0 to x=0.5 m? Express the answer as a positive number in Joules. 8) A mass m=4 kg is connected to a bungee cord which acts like a spring with a spring force F=-Cx3, with C=2 in MKS units. If this spring force is the only force acting on the mass and the initial displacement is x:2 m and the initial velocity v:0, what is the change in velocity after a short time step of 0.01 seconds? Express the answer in m/ s and include the sign of the change in velocity. 9) Suppose a constant force of F25 N is applied to slide an object of mass 100 grams 3 meters along a surface with friction forces acting. If 80% of the work energy is converted to heat energy, 0% to potential energy, and the remainder to kinetic energy, what is the final velocity of the object, expressed as a positive number in m/ s? 10) Please re—enter your ID number as the answer to this question and doublecheck that you marked it correctly and the same in the ID entry boxes at the top left corner of your scantron form. Also check that you entered the test version letter. 10) Answer Key Testname: QUIZB—l 1AM 1) C H): Lfffil‘rRm’l 2)E H): L, SE ‘ NJ. 3) D il): Lbliii~2 4) C iL): LISVRMB 5) 917 m/s ”5: LHE‘VRQ‘I 6) 0.039 U): LbfLR-J’ 7) 0.031 N): USER—7 8) —0.04 If): UHI‘lRw‘fi 9) 7.7 EU: USER—{v ‘ m ED: LSER—v’i A—3 isr’ncicfi‘ S/Wv; Mfms A" )7)?!” Wing 0 g, —.—=—> (4,751” /< //2///\p/£S #- (69424” figV'C/VCQ/ ; :14. z jfflv/z :9 #fl sr4rrMI/V7‘S Ava/E 7'1 12;. (st? coy/'59 1784—!!!" rm 3 2/ // J / /$ WGT’ 775226. f% /5 ofl/y 7’7705 215 flint fl—ms fla off/e7“ %flc£$ AMI/«7 W“ M‘ “537567“ // // @ K )S ~r/‘MUE . / wart" /§ (/ flimfa’y' (/fl’tfl") M . / $31on fine: ¢//5Wc£ 77’06 :3 > fl/v- E/V‘r/yy W WW7}: N 7—145 7745 @ flfl? w; #5 floater’s Ava/five Fat/7) /S 1&A/Vf/7'Efl //Vf‘0 %54—7’ f/VtW/y 4 7L @ fl/E fin/274W? fiu4wr/arv £97; Mar/”y 7%" fl MMS aw # S/fl/Vj /s; 7(0/3 Yo szoéos{/§é) gAflJ%:O. 775m Mg z/Mac/W 2s a W07? 2560 2S o//0$/T€ %§£ 5/4/«1/ fancé’ ‘/ Ag) 2‘;()<>~= -(_€>(3> 6% AVmchf‘ wmer qfifi: r—KXB: .fiz(z> 2"? [email protected] ...
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