Physics 114 Final Exam Questions Well Answered 2025| 2026 Updated

1. increases in magnitude as the object's speed increases 2. is opposite in direction to the velocity of the object v⃗→ - correct answers The drag force: Ball A=1/2CdpAv^2 Ball B=1/2CdpAv^2 Ratio Ball A to Ball B: 1/2Cdp(d)v^2/(pv((2d)^2)/n)=1/2*1/2=0.250 - correct answers Ball A with diameter d and ball B with diameter 2d are dropped from the same height. When the two balls have the same speed, what is the ratio of the drag force on ball A to the drag force on ball B? equal to - correct answers A falling object will reach its terminal speed when the magnitude of the drag force is ______________ to the magnitude of the weight force. The drag force goes up by a factor of 4. - correct answers The drag force pushes opposite your motion as you ride a bicycle. If you double your speed, what happens to the magnitude of the drag force? almost immediately come to rest once they stop swimming - correct answers Very small organisms, like paramecia or protozoa, moving around in water __________. a. 4 forces b. 3 forces c. 18 N d. 18/9=2.0 m/s^2 e. A=B=C f. 18 N-(6.0 kg)(2.0 m/s^2)=6.0 N g. (3.0 kg)(2.0 m/s^2) - correct answers Two boxes of mass 6.0 kg and 3.0 kg are pushed across a smooth (frictionless) floor by a 18 N force that is horizontal to the floor. a. How many forces are exerted on Box A? b. How many forces are exerted on box B? c. Suppose we consider the two boxes as a single box, box C that has a mass of 9.0 kg. What is the net force on box C? d. What is the acceleration of box C? e. Rank the magnitudes of the accelerations of boxes A, B and C. f. If all the boxes have the same acceleration, what is the magnitude of the force that box A exerts on box B? g. What is the magnitude of the force that box B exerts on box A? 1. tension 2. massless 3. equals 4. force - correct answers Generally, the ______ in a ______ string or rope ______ the magnitude of the ______ pulling on the end of the string or rope. 50 N - correct answers Two boxes are suspended from a rope over a pulley. Each box has weight 50 N. What is the tension in the rope? The velocity vector is perpendicular to the acceleration vector; the acceleration vector is parallel to the net force vector. - correct answers For an object in uniform circular motion, what can you say about the directions of the velocity, acceleration, and net force vectors? Uniform circular motion - correct answers In the video, a car rounding a corner and a car going over the crest of a hill are both presented as examples of... counterclockwise from the positive x-axis. - correct answers According to the convention used in the textbook, the angular position θ is positive when measured: 150*(2pi/360)=2.6 radians - correct answers How many radians are equivalent to 150°? Give your answer to two signficant figures. 2 revolutions=2*360=720 degrees(2pi/360)=12.57 radians w=angle/time w=12.57/0.95=13.2 rad/s - correct answers Suppose a child swings around her straight arm counterclockwise about her shoulder joint. If her arm is 40.0 cm long, and her arm completes exactly 2 revolutions in 0.95 s, what is her arm's angular velocity in rad/s? v=r*w v=(0.4)(13)=5.2 m/s - correct answers Suppose a child swings around her straight arm about her shoulder joint at an angular velocity of 13 rad/s. If her arm is 40.0 cm long, what is the speed of her hand? 5 radians - correct answers Consider the angular position-versus-time graph in Figure P7.9 in the problems section at the end of chapter 7. What is the angular velocity of the object between t = 0 s and t = 10 s? a=w/t a=13/1.5 a=8.7 rad/s^2 - correct answers Suppose a child starts swinging around her straight arm counterclockwise about her shoulder joint, starting at rest. If her arm's angular speed reaches 13 rad/s in 1.5 seconds, what is her arm's angular acceleration in rad/s2? -100 rad/s^2 - correct answers Consider the angular velocity-versus-time graph in Figure P7.62 in the problems section at the end of chapter 7. What is the angular acceleration of the object between t = 0 s and t = 2 s? Angular velocity Velocity - correct answers In the video, the two stuffed animals that rode on the turntable had the same __________ but had different _________ negative - correct answers If an object is rotating clockwise, this corresponds to a _____ angular velocity. points toward the center of the circle. - correct answers The acceleration of a particle that moves with uniform circular motion: a=(v^2/r)=[(1.3)^2/0.1]=17.0 m/s^2 - correct answers A particle moves in a circle with radius 10 cm and with a uniform speed 1.3 m/s. What is the centripetal acceleration of this particle? F=1/T F=1/4 F=0.250 s^-1 - correct answers A particle in uniform circular motion has a period of 4.0 seconds. What is the particle's frequency? F=ma F=m(v^2/r) F=mv^2/r - correct answers What is the net force acting on a particle with mass m moving with uniform speed of v in a circular path with radius r? F1; greater moment arm - correct answers Which of the following forces in Figure 7.16 is the most effective at opening the door? 1. The magnitude of the force. 2. The distance r from the pivot - the axis about which the object can rotate - to the point where the force is applied. 3.The angle at which the force is applied. - correct answers The ability of a force to cause a rotation depends on: