Final-1A simple pendulum is swinging back and forth. What is the direction of the acceleration of the pendulum mass at the moment when it is at maximum displacement to the right?Pink: zeroPurple: None of these.A free-body diagram of the forces on the ball when it is at theextreme right position is shown.Suppose now the ball swings back and forth between horizontalpositions:Green Blue Yellow mg T FnetWhen the ball is in the horizontal position, the tension in the string is Pink: zeroYellow: not zero.Final-2A computer monitor is thrown upward. It rises to a height h and falls back down to Earth. During the flight, the work done by the force of gravity is...Pink: mgh Green: 2mgh Blue: zeroYellow: -mgh Purple: -2mghDuring the flight, the work done by the drag force of air resistance is..Pink: zero Yellow: positive Green: negativehFinal-3A Cadillac and a Volkswagen have a head-on collision and stick to together in a mangled pile of metal and bloody limbs. The police determine that the wreckage is in the exact same spot where the two cars collided. Detective O'Newton (who got an A in Physics 1110) writes in his report that, just prior to the collision, the two cars had the same... Pink: magnitude of momentum. Yellow: kinetic energy.Blue: mass. Green: speed.Which car had the larger speed?Pink: Cadillac Yellow: VolkswagenFinal-4Schwinn decides to redesign its model X-2000 28-speed "Road Warrior" bike ($129.95). The rims of the wheels are made lighter but more weight is added to the frame so the total weight of the bike remains unchanged.Compared to the old bike, when the new bike is moving at a given speed, itstotal kinetic energy is..Pink: less. Yellow: greater Blue: the same.Compared to the old bike, when the new bike is accelerated from rest up to agiven speed, does the rider have to work less, more, or the same?Pink: less. Yellow: greater Blue: the same.Final-5A distraught student standing at the edge of a cliffthrows one calculator straight up and anothercalculator straight down at the same initial speed. Neglecting air resistance, the one which hits theground with the greatest speed is the onethrown ... BLUE: upward.YELLOW: downward.PINK: neither–they both hit at the same speed.Same question, but now do not neglect air resistance. The calculator which hits with the greatest speed is the one thrown..BLUE: upward. YELLOW: downward.PINK: neither–they both hit at the same speed.Final-6A flaming physics book is dropped from anairplane flying at height h at constant horizontalvelocity and speed vo. Neglecting air resistance,the book will...BLUE: quickly lag behind the planeYELLOW: remain vertically under the planePURPLE: move ahead of the planeGREEN: it depends how fast the plane is flying.What is the speed with which the book hits the ground?Blue: 0v 2g hYellow: 0v 2g hPurple: Neither/don't know[Hint: For 1D motion along x: v2 = v02 + 2a(x-x0).]h voFinal-7Consider an exhausted physics student standing in an elevator that is movingupward with constant velocity. The upward normal force N exerted by the elevator floor on the student is...BLUE: larger thanYELLOW: identical toPINK: smaller thanthe weight mg of the student.Final-8A student attempting to make her 9th pot of coffeeis so shaky she drops the coffee filter. The filterfloats gently downward, at some constant("terminal") velocity v.The net force on the coffee filter isBLUE: UpwardsYELLOW: DownwardsGREEN: Zero.v=constantFinal-9A relieved student driving away from CU on Dec. 21 wishes to cause her carto accelerate. How many controls in an ordinary car are specifically designed and intended to accelerate the vehicle?BLUE: onePURPLE: twoGREEN: threeYELLOW: more than threeFinal-10At some instant in time, two asteroids in deepspace are a distance r=20 km apart. Asteroid 2has 10 times the mass of asteroid 1. What isthe ratio of their resulting acceleration (due tothe gravitational attraction between them)?a1 / a2 = Blue: 10 Yellow: 1/10 Green: 1Pink: None of these/don't knowThis is a problem with constant acceleration. Green: True Pink: Falsem 10 m m1 m2Final-11An distraught student works out his aggression by attempting to knock downa large wooden bowling pin by throwing balls at it. The student has two balls of equal mass, one made of rubber and the other of putty. The rubber ball bounces back, while the ball of putty sticks to the pin. Which ball is most likely to topple the bowling pin?BLUE: the rubber ballYELLOW: the ball of puttyPINK: makes no differenceGREEN: need more informationFinal-12Suppose a Ping-Pong ball and a bowling ball are rolling toward you. Both have the same momentum, and you exert the same force to stop each. How do the time intervals to stop them compare?BLUE: It takes less time to stop the Ping-Pong ball.YELLOW: Both take the same time.PURPLE: It takes more time to stop the Ping-Pong ball.Which ball travels further while slowing down?BLUE: the Ping-Pong ball.YELLOW: Both travel the same distance.PURPLE: The bowling ball.Final-13Consider a light rotating rod with 4point masses attached to it atdistances 2 and 4, as shown. The axisof rotation is thru the center of therod, perpendicular to its length. The4 masses are moved to new positionsso that all masses are now 3 unitsfrom the axis. Did the moment ofinertia I Pink: increaseGreen: decrease Yellow: remain the same2 4 3Final-14Two wheels initially at rest roll the same distance without slipping down identical inclined planes. Wheel B has twice the radius but the same mass as wheel A. All the mass is concentrated in their rims, so that the rotational inertia's are I = mR2 . Which has more translational kinetic energy when it gets to the bottom?BLUE: Wheel A PINK: Wheel BPURPLE: The kinetic energies are the same.YELLOW: need more informationFinal-15A physics text of mass m sits at rest on a woodenboard inclined at an angle above a flaminghibachi. The coefficient of static friction betweenthe text and the board is s. How does themagnitude of the force of friction between the textand the board compare to the weight mg of the text?Pink: mg > FfricGreen: mg < FfricPurple: mg = Ffric Yellow: mg can be either greater than, less than, or equal to Ffric, depending on the size of
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