BOBOdH6H6H6. H" p-Z xHHHV,(hh hd'0F ' l@/j86.Davis6.Color SW 2lorS2j!@1H  X4(|DSETb -- LIH[\xF#ch)t ',1} 1}& ($    . / Z [ \    E F  " #   ;  * Y    s t   8 u   % y  @ o  : S   X  t       ; a b  > y    2 A W o   W i       C }    + ; Q q     - m     K     C     4 q    ! c r      S   ? @ A B C D    # R S       9 } ! !d !e ! ! ! ! " " "< "m " " " " #c # # $ $& $' $ $ $ $ %= %> % % % % & & & & & ' '# 'D ' ' ' ' ( (9 (` (a ( ( ( )& )P )Q ) ) *g + +e +f + + + , ,/ ,0 ,k , , ,     > H L N Z [ ]   E H K O P Q R S              " # $ %    * + Y Z                            K N r   E F G H I t                  + , B C T U       & ' / 0 8 9 E F N O [ \ f g j k w x                     = > L M N O R S U V e f g h i m n } ~          a b            + , 0 1 9 : ; < A B c d e f r s                 J R  > ? C $7 $@ $Y $] $t ${ $ %< 'I ' ) ) ) ) ) ) ) ) ) ) *H *I *m *n * * + + +F +G ,3 @ :THiiU  1|[K)"%T) Physics 1150 Final Exam Fall semester 1995 Name: _________ ____ ___________ 1. Just as a traffic light turns green, a truck passes through the intersection and continues to move with constant velocity vtruck. At this same time a sports car starts from rest and accelerates with a constant acceleration of acar = 2.2m/s2. Of course the truck leads the sports car at first. But the sports car catches up with the truck and overtakes it in 500 m. Find the following: a) the speed of the truck, vtruck , and b) the speed of the car as it overtakes the truck. 2. A 1.8 kg block sits on an inclined plane. The plane is inclined at 20 the the horizontal. The coefficient of friction between the block and the plane is 0.10 (ie, =0.10). Find the acceleration of the block.  3. A 0.250 kg mass is attached as a simple harmonic oscillator to a spring whose spring constant is 75UN/m. To start the oscillations, the mass is pulled to on side 10cm (or 0.10 m) and released.  a) Find the speed of the mass when it is located at x =5 cm (or x = 0.05 m). b) Find the speed of the mass when it passes through equilibrium at x=0.4. A 0.050-kg ice cube, initially at 5.0C, is placed in 0.30 kg of water at 25C (thats about room temperature). Assume no heat is lost to the environment. What is the final temperature of the water? Or, if melting is not complete, how much ice remains unmelted at thermal equilibrium? cice = 2090 J/kg C , cwater = 4186 J/kg C , Lf = 3.33 x 105 J/kg True or False. Transfer all your answers to the front, cover sheet. I will not look at what you have written here. 1. Vector angles are always measured from the positive x-axis. 2. Velocity is the slope of the line on a distance-time graph. 3. Acceleration is the slope of the line on a distance-time graph. 4. Acceleration is the time rate of change of the velocity. 5. Acceleration is always constant. 6. For straight-line motion, velocity is always positive. 7. For a ball thrown straight up, its velocity at the top of its path is zero. 8. For a ball thrown straight up, its acceleration at the top of its path is zero. 9.The apparent weight of a passenger always increases while an elevator is moving upward. 10. In a loop-the-loop of a roller coaster, gravity always applies a force toward the center of the loop. 11. A roller coaster ride is a good demonstration of the conservation of momentum. 12.A diver, doing a double somersault, is a good demonstration of the conservation of angular momentum. 13. A diver, doing a double somersault, changes his angular velocity by keeping his moment of inertia constant. 14. A figure skater, in doing a spin about a vertical axis, keeps her moment of inertia constant while she pulls her arms and legs in close to her axis of rotation. 15. A figure skater, in doing a spin about a vertical axis, keeps her angular momentum constant while she pulls her arms and legs in close to her axis of rotation. 16. The specific heat of (liquid) water is about twice the specific heat of ice. That means a given amount of heat that will raise the temperature of (liquid) water 10 C will raise the temperature of the same mass of ice by about 5 C. 17. If enough ice, at 10C, is added to 0.5 kg of water at 23C (room temperature), the final temperature of the ice-water system may be 28C. 18. Expansion joints are placed in bridges and highways because steel and concrete expand as their temperatures increase. 19. We receive energy from our Sun through the mea1ns of convection. 20. The fundamental frequency of a note determines the pitch of the note that is heard. 21.The fundamental frequency of a note determines the quality or timbre or voice of the instrument that is heard. 22. Harmonics are always of lower frequency than the fundamental. 23. Gravity supplies the centripetal force that holds the moon in its orbit. 24. In a flat (or unbanked) curve friction between the tires and the road supplies the centripetal force that allows a car to make the curve. 25. Projectile motion may be described as horizontal motion with constant acceleration of 9.8 m/s2 and vertical motion at constant velocity.Multiple Guess Throughout, use E) for none of the above. Transfer all your answers to the front, cover sheet. I will not look at what you have written here. 1.  An airplane travels at 100 km/hr on a heading of 30 west of north. The components of its velocity are (where North is the positive y-axis and East is the positive xaxis) A) vx = 50 km/hr, vy = 87 km/hr B) vx = 50 km/hr, vy = - 87 km/hr C) vx = 87 km/hr, vy = - 50 km/hr D) vx= - 87 km/hr, vy = 50 km/hr 2. A ball is thrown with a speed of 10 m/s at an angle of 37 above the horizontal, giving it initial velocity components of vix = 8 m/s and viy = 6 m/s. At the top of its path, A) vx = 0, vy = 0; ax = 0, ay = 0 B) vx = 0, vy = 6 m/s; ax = 9.8 m/s2, ay = - 9.8 m/s2 C) vx = 8 m/s, vy = 6 m/s; ax = 0, ay = - 9.8 m/s2 D) vx = 8 m/s, vy = 0; ax = 0, ay = - 9.8 m/s2 3. The distance an object falls after being dropped from rest is given by A) y = vi t B) y = (1/2) vi t2 C) y = (1/2) g t2 D) y = (1/2) vi t2 4. A car, traveling down a straight highway, initially moving at 20 m/s, comes to a stop by braking wi[th an acceleration of 5 m/s2. How far does the car go during the time its brakes are being applied? A) v = vi + a t 20 = 0 + (9.8) t t = = 2.04 s x = v t = (2.04 s)(20 m/s) = 40.8 m B) v2 = vi2 + 2 a (s - si) 0 = 202 + 2 (-5)(s - si) (s - so) = = 40 m C) s = si + vi t + (1/2) a t2 s = 0 + (20)(2.04) + (1/2)( 5)(2.04)2 = 30.4 m D) s = si + vi t + (1/2) a t2 s = 0 + (20)(2.04) + (1/2)(9.8)(2.04)2 = 61.2 m 5. The length of a pendulum is made twice as long. This changes its period by A) one-half. B) twice as great. C) making the period longer. D) making the period shorter. 6. In an inelastic collision, A) Kinetic energy is conserved and momentum is conserved. B) Kinetic energy is not conserved and momentum is conserved. C) Kinetic energy is conserved and momentum is no tconserved. D) Kinetic energy is not conserved and momentum is not conserved. 7. In an elastic collision, A) Kinetic energy is conserved and momentum is conserved. B) Kinetic energy is not conserved and momentum is conserved. C) Kinetic energy is conserved and momentum is no tconserved. D) Kinetic energy is not conserved and momentum is not conserved. 8. Consider a girl swinging on a playground swing, A) At the bottom of her swing potential energy is greatest. B) At the bottom of her swing potential energy is smallest. C) At the top of her swing kinetic energy is greatest. C) At the top of her swing potential energy is smallest. 9. Again, consider a girl swinging on a playground swing, A) At the bottom of her swing kinetic energy is greatest. B) At the bottom of her swing kinetic energy is zero. C) At the top of her swing kinetic energy is greatest. C) At the top of her swing potential energy is smallest. 10. The period of a simple pendulum is directly proportional to A) the mass B) the square of the length of the string C) the acceleration of gravity D) the amplitude 11. The centripetal acceleration of a body in uniform circular motion A) is a force that must be added to the net force. B) is the net force and is directed tangential to the circluar path. C) is the net force and is directed toward the center of the circle. D) is the net force and opposes the motion (is opposite to the direction of the motion). 12. The force that keeps a satellite in a circular orbit about Earth is A) supplied by Earths gravitational pull. B) supplied by rocket engines. C) due to interactions with the molecules in the upper atmosphere. D) supplied by the Suns gravitaional pull. 13. The force that keeps a satellite in a circular orbit about Earth is A) the centripetal force. B) opposed by the centripetal force. C) a friction force. D) tangential to the orbit. 14. Work done on an object can A) change its kinetic energy by an amount equal to the work done B) change its potential energy by an amount equal to one-half the work done D) change its total energy by an amount equal to one-half the work done E) change its kinetic energy by an amount equal to one-half the work done 15. Work done on an object can A) only be positive B) be positive or negative C) be equal to its change in momentum D) be equal to its change in angular momentum 16. Which of the following is true? A) Energy is a vector. Momentum is a scalar. B) Energy and momentum are both vectors. C) Energy and momentum are both scalars. D) Energy is a scalar. Momentum is a vector. 17. Two nearby tuning forks, vibrating at 524 Hz and 440 Hz, are struck and sound in air at the same time. A) The 524 Hz fork produces sound with longer wavelengths. B) The wavelengths are the same. C) The 440 Hz fork produces sound with longer wavelengths. D) Beats will be heard a 16 Hz. 18. The mass on the end of a spring is increased from 300 g to 400 g. This affects the period by A) making the period longer. B) making the period shorter. C) The period is not affected. D) This can not be answered without additional information about the amplitude. 19. 0.2 kg of ice at 10C is added a container of 1.2 kg of (liquid) water at 20C. The final temperature of the mixture will be A) less than 5C B) exactly 5C C) more than 5C D) blank 20. A mass on the end of a spring moves as a simple harmonic oscillator. The spring, with spring constant of 60 N/m, is replaced by another spring with spring constant of 120 N/m. This affects the period by . . . A) making the period longer. B) making the period shorter. C) the period is not affected. D) This can not be answered without additional information about the amplitude. 21. The speed of sound in air A) is proportional to the length of a column of air in a pipe. B) increases with temperature. C) decreases with temperature. D) is proportional to the frequency. 22. For standing waves on a string, the length of the string is always A) an integer times the wavelength. B) an integer times half the wavelength. C) an integer times twice the wavelength. D) an odd integer times the wavelength. 23. The rotational equivalent of Newtons second law of motion is t = I a . A) t is the period, I is the moment of inertia, a is the angular acceleration B) t is torque, the rotational equivalent of force; I is the angular momentum, and a is the angular acceleration. C) t is torque, the rotational equivalent of force; I is the moment of inertia, the rotational equivalent of mass; and a is the angular acceleration. D) t is period of one oscillation, I is the moment of inertia, and a is the angular acceleration. 24. Harmonic frequencies are A) one-half the fundamental frequency B) twice the fundamental frequency C) an integer times the fundamental frequency D) 2 times the fundamental frequency 25. 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