PH 2004 Fall Quizzes(2) - Physics Honors Physics Honors...

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Unformatted text preview: Physics Honors Physics Honors Distributed By: Tyrone G Carter Chapter 2 Quiz 1. Which of the following can never be a negative quantity? A. Average velocity B. Displacement C.* Instantaneous speed D. gravitational acceleration E. not covered in the assigned reading. Can an object's velocity change direction when its acceleration is constant? A. No, this is not possible because it is always speeding up. B. No, this is not possible because it is always speeding up or always slowing down, but it can never turn around. C.* Yes, this is possible, and a rock thrown straight up is an example. D. Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example. E. Not covered in the assigned reading Can an object have increasing speed while its acceleration is decreasing? A. No, this is impossible because of the way in which acceleration is defined. B. No, because if acceleration is decreasing the object will be slowing down. C. Yes, and an example would be an object falling in the absence of air friction. D.* Yes, and an example would be an object dropped from rest in the presence of air friction. E. Not covered in the assigned reading. Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion? A. In equal times its speed increases by equal amounts. B.* In equal times its velocity changes by equal amounts. C. In equal times it moves equal distances. D. None of these are true. E. Not covered in the assigned reading. A ball is thrown straight up. What is its instantaneous acceleration just before it reaches its highest point? A. Zero B. Slightly less than g. C.* Exactly g. D. Slightly greater than g. E. Not covered in the assigned reading Objects A and B both start at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. After the acceleration, object A is moving __________ as object B. A. at the same speed B.* twice as fast C. three times as fast D. four times as fast E. Not covered in the assigned reading. Objects A and B both start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. During the times that the objects are being accelerated, compare the distance traveled by object A to that of object B. After the acceleration, object A has traveled __________ as object B. A. the same distance B. twice as far C. three times as far D.* four times as far E. Not covered in the assigned reading. Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between them A.* increases. B. remains constant. C. decreases. D. cannot be determined from this information. E. Not covered in the assigned reading. How is motion in the negative direction represented on a position vs time graph? A. By a curve to the left of the origin. B. By a curve below the horizontal axis. C.* By a downward sloping curve. D. Such a motion cannot be shown on a simple x vs. t graph. E. Not covered in the assigned reading. Complete the following word analogy: acceleration is to velocity as __________ is to __________ . A. acceleration, displacement B. displacement, velocity C.* velocity, displacement D. displacement, acceleration E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Physics Honors Distributed By: Tyrone G Carter Chapter 3 Quiz 1. If the acceleration of an object is always directed perpendicular to its velocity, A. the object is speeding up. B. the object is slowing down. C.* the object is turning. D. this situation is impossible. E. Not covered in the assigned reading. If you want to cross a river in a motorboat in the least amount of time, you should try to swim A.* straight across the river. B. slightly upstream. C. slightly downstream. D. in any direction; it doesn't matter. E. Not covered in the assigned reading. Consider a plane flying with groundspeed Vg and airspeed Va in a wind with speed V relative to the ground. Which of the following relationships is true? A. Vg = V a + V B. Vg can be greater than Va + V C. Vg can be less than Va + V D.* Vg can be between Va + V a nd Va - V E. Not covered in the assigned reading. Suppose that several projectiles are fired. Which one will be in the air longest? A. The one with the farthest range B.* The one with the highest maximum elevation C. The one with the greatest initial velocity. D. None of these. E. Not covered in the assigned reading. A pilot drops a bomb from a plane flying horizontally at constant speed. Ignoring air resistance, when the bomb hits the ground, the horizontal location of the plane will A. be behind the bomb. B.* the same as that of the bomb. C. be in front of the bomb. D. depend on the speed of the plane. E. Not covered in the assigned reading. A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below? A. It is impossible to tell from the information given. B.* The stone C. The ball D. Neither, since both are traveling at the same speed. E. Not covered in the assigned reading. An Olympic athlete throws a javelin at four different angles above the horizontal, each with the same speed: 30° 40° 60° 80°. Which two throws cause the javelin to land the same distance away? A. 30° and 80° B. 40° and 60° C. 40° and 80° D.* 30° and 60° E. Not covered in the assigned reading. A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance and assume that the surface of the earth is flat. Compare the times of fall of the two bullets. A. The fired bullet hits first. B. The dropped bullet hits first. C.* They hit at the same time. D. Cannot tell without more information. E. Not covered in the assigned reading. Suppose an object has components of acceleration in both the x and y directions. A. It is moving in a circle. B. It is moving in a curved but non-circular path. C.* It may be moving in a straight line. D. Its velocity may be constant. E. Not covered in the assigned reading. A man at the top of a tall building is attempting to shoot a target on the ground with his gun. Which of the following is true? A. He should aim his gun directly at the target. B. Where he should aim his gun does not depend on the height of the building he's in. C.* He should aim his gun above the target. D. He should aim his gun below the target. E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Distributed By: Tyrone G Carter 1. A packing crate slides down an inclined ramp at constant velocity. We can conclude that A.* a frictional force acts on it. B. a net downward force acts on it. C. it may be accelerating. D. the weight of the crate is quite small. E. Not covered in the assigned reading. In the absence of an external force, a moving object will A. stop immediately. B. slow down and eventually stop. C. go faster and faster. D.* move with constant speed. E. Not covered in the assigned reading. The acceleration due to gravity is lower on the moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the moon's surface, compared to Earth? A. Mass is less, weight is same. B.* Weight is less, mass is same. C. Both mass and weight are less. D. Mass and weight are the same. E. Not covered in the assigned reading. Action-reaction forces A. sometimes act on the same object. B. always act on the same object. C. may be at right angles. D.* always act on different objects. E. Not covered in the assigned reading. An egg is dropped out of the window of a tall building. When it hits the ground, a force F will act on the egg that will cause it to crack. Which of the following is FALSE? A.* The force F is equal to the weight of the egg. B. The faster the egg is moving when it strikes the ground, the larger force F will be. C. The quicker the egg comes to a stop after striking the ground, the larger force F will be. D. Force F acts upward on the egg. E. Not covered in the assigned reading. For a car to maintain a constant acceleration, the car's engine must A. maintain a constant power output. B. develop ever-decreasing power output. C.* develop ever-increasing power output. D. maintain a constant torque. E.* Not covered in the assigned reading. A free-body diagram of a ball in free fall in the presence of air resistance would show A. a downward arrow to represent the force of air resistance. B. only a downward arrow to represent the force of gravity. C.* a downward arrow to represent the force of gravity and an upward arrow to represent the force of air resistance. D. an upward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance. E. Not covered in the assigned reading. A hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted by each object. A. The nail exerts a force on the hammer; the hammer exerts a force on the wood. B. The hammer exerts a force on the nail; the wood exerts a force on the nail. C.* The hammer exerts a force on the nail; the nail exerts a force on the hammer. D. The hammer exerts a force on the nail; the hammer exerts a force on the wood. E. Not covered in the assigned reading. As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is A.* greater than the player’s weight. B. equal in magnitude and opposite in direction to the player's weight. C. less than the player’s weight. D. zero. E. Not covered in the assigned reading. The magnitude of the force of gravity acting on an object is A. frictional force. B. inertia. C.* weight. D. mass. E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Physics Honors Chapter 5 Quiz Distributed By: Tyrone G Carter 1. Is it possible for a system to have negative potential energy? A. Yes, as long as the total energy is positive. B.* Yes, since the choice of the zero of potential energy is arbitrary. C. No, because the kinetic energy of a system must equal its potential energy. D. No, because this would have no physical meaning. E. Not covered in the assigned reading. Can work be done on a system if there is no motion? A. Yes, if an outside force is provided. B. Yes, since motion is only relative. C. No, since a system that is not moving has no energy. D.* No, because of the way work is defined. E. Not covered in the assigned reading. Consider two masses m1 and m2 at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which m1 sits is at an angle of 30 degrees to the horizontal, while the plane on which m2 sits is at 60 degrees. If the masses are released, which is going faster at the bottom of its plane? A. m1 B. m2 C.* They are going the same speed. D. Cannot be determined. E. Not covered in the assigned reading. A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? A.* More than 30 J B. Less than 30 J C. Exactly 30 J D. Cannot be determined. E. Not covered in the assigned reading. If you push twice as hard against a stationary brick wall, the amount of work you do on the wall A. doubles B. is cut in half C. remains constant but non-zero D.* remains constant at zero. E. Not covered in the assigned reading. A child pushes horizontally on a box of mass m t hat moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is At what rate does the child do work on the box? . A.* B. C. D. E. 2. 3. 4. 5. 6. 7. Two objects collide and stick together. Kinetic energy A. is definitely conserved. B. is conserved only when momentum is conserved. C. is conserved only if the collision is elastic. D. is conserved only if the environment is frictionless. E.* Not covered in the assigned reading. Which of the following energy forms is associated with an object due to its position relative to Earth? A. potential energy B.* gravitational potential energy C. elastic potential energy D. kinetic energy E. Not covered in the assigned reading. Which of the following energy forms is stored in any compressed or stretched object? A. potential energy B. gravitational potential energy C.* elastic potential energy D. kinetic energy E. Not covered in the assigned reading. An object is moving in a circular path at constant speed. Does the force acting on the object do work on the object? A. Yes, since a force acts and the object moves, and work is force times distance. B. Yes, since it takes energy to turn an object. C.* No, because the object has constant speed. D. No, because the object ends up where it starts. E. Not covered in the assigned reading. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Phyics Honors Distributed By: Tyrone G Carter Chapter 6 Quiz 1. Two equal mass balls (one blue and the other gold) are dropped from the same height, and rebound off the floor. The blue ball rebounds to a higher altitude. Which ball is subjected to the greater magnitude impulse during its collision with the floor? A. It's impossible to tell. B. The impulse was the same for both. C. The gold ball D.* The blue ball E. not covered in the assigned reading. A small object collides with a large object and sticks. Which object experiences the larger magnitude of momentum change? A. the large object B. the small object C.* both have the same momentum change. D. Cannot be determined. E. not covered in the assigned reading. Two objects move on a level frictionless surface. Object A moves east with a momentum of 24 kg·m/s. Object B moves north with momentum 10 kg·m/s. They make a perfectly inelastic collision. What is the approximate magnitude of their combined momentum after the collision? A. 14 kg m/s B.* 26 kg m/s C. 34 kg m/s D. zero. E. not covered in the assigned reading. A very large object moving with speed v collides head-on with a very small object at rest. The collision is elastic, and there is no friction. The large object barely slows down. What is the speed of the small object after the collision? A. nearly v B.* nearly 2v C. nearly 3v D. nearly infinite E. Not covered in the assigned reading. Two isolated objects collide and bounce off each other. Linear momentum A.* is definitely conserved. B. is definitely not conserved. C. is conserved only if the collision is elastic. D. is conserved only if the environment is frictionless. E. Not covered in the assigned reading. The change in an object’s momentum is equal to A. the product of the mass of the object and the time interval. B.* the product of the force applied to the object and the time interval. C. the time interval divided by the net external force. D. the net external force divided by the time interval. E. Not covered in the assigned reading. A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually does not break because for the egg dropped on the grass, A. the change in momentum is greater. B.* the time interval for stopping is greater. C. the change in momentum is less. D. the time interval for stopping is less. E. Not covered in the assigned reading. A large moving ball collides with a small stationary ball. The momentum A.* of the large ball decreases, and the momentum of the small ball increases. B. of the small ball decreases, and the momentum of the large ball increases. C. of the large ball increases, and the momentum of the small ball decreases. D. does not change for either ball. E. Not covered in the assigned reading. A 20 kg shopping cart moving at a velocity of 0.5 m/s collides into a store wall and stops. The momentum of the shopping cart A. increases. B. remains the same. C.* decreases. D. is conserved. E. Not covered in the assigned reading. A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. The momentum of the rubber ball A. increased in magnitude. B. remained the same. C. decreased in magnitude. D.* changed somehow, but not in magnitude. E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Distributed By: Tyrone G Carter 1. A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? A.* g downward B. 2g downward C. g upward D. 2g upward E. Not covered in the assigned reading. A spaceship is traveling to the moon. At what point is it beyond the pull of earth's gravity? A. When it gets above the atmosphere B. When it is half-way there C. When it is closer to the moon than it is to earth D.* It is never beyond the pull of earth's gravity. E. Not covered in the assigned reading. A spherically symmetric planet has four times the earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the earth, how much would it weigh on the surface of this planet? A. 6N B.* 12 N C. 24 N D. None of these. E. Not covered in the assigned reading. An astronaut is inside a space capsule in orbit around the earth. The earth's gravity causes the space capsule to move in a circle around the earth at constant speed. The astronaut is able to float inside the capsule because A. her weight is zero, and her capsule's weight is zero. B. her weight is zero, and her capsule is accelerating. C. she and her capsule move with the same constant velocity. D.* she and her capsule move with the same acceleration. E. Not covered in the assigned reading. Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration? A. No, because then the path would not be a circle. B. No, an object can only have one or the other at any given time. C. Yes, this is possible if the speed is constant. D.* Yes, this is possible if the speed is changing. E. Not covered in the assigned reading. An object moves in a circular path at a constant speed. Consider the direction of the object's velocity and acceleration vectors. Which of the following is true? A. Both vectors point in the same direction. B. The vectors point in opposite directions. C.* The vectors are perpendicular. D. The question is meaningless, since the acceleration is zero. E. Not covered in the assigned reading. A car goes around a curve of radius R at a constant speed v. Then it goes around a curve of radius 2R at speed 2v. What is the centripetal acceleration on the car as it goes around the second curve, compared to the first? A. one fourth as big B. one half as big C.* twice as big D. four times as big E. Not covered in the assigned reading. A car goes around a curve of radius R at a constant speed v. What is the direction of the net force on the car? A.* toward the curve's center B. away from the curve's center C. toward the front of the car D. toward the back of the car E. Not covered in the assigned reading. Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius R, what is the radius of planet B? A. 0.707R B. R C.* 1.41R D. 4R E. Not covered in the assigned reading. T wo planets have the same surface gravity, but planet B has twice the radius of planet A. If planet A has mass M, what is the mass of planet B? A. 0.707M B. M C. 1.41M D.* 4M E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC Physics Honors Physics Honors Distributed By: Tyrone G Carter Quiz: Chapter 12 1. A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum? A.* At either A or B B. Midway between A and B C. One-fourth of the way from A to B D. None of these E. Not covered in the assigned reading. What is the velocity of propagation if a wave has a frequency of 12 Hz and a wavelength of 3m? A. 0.25 m/s B. 4 m/s C.* 36 m/s D. None of these E. Not covered in the assigned reading. A mass hanging on a spring of constant k has natural frequency f. If the spring is changed to one of constant 4k, what is the new natural frequency? A. 4f B.* 2f C. 0.5 f D. 0.25 f E. Not covered in the assigned reading. In a wave, the maximum displacement of points of the wave from equilibrium is called the wave's A. speed. B. frequency. C. wavelength. D.* amplitude. E. Not covered in the assigned reading. Which of the following is the time it takes to complete a cycle of motion? A. amplitude B.* period C. frequency D. acceleration E. Not covered in the assigned reading. By what factor should the length of a simple pendulum be increased if the period of the motion is to be tripled? A. 3 B. 6 C.* 9 D. 27 E. Not covered in the assigned reading. What happens to the energy carried in a given time interval by a mechanical wave when the wave’s amplitude is doubled? A. It increases by a factor of two. B.* It increases by a factor of four. C. It decreases by a factor of two. D. It decreases by a factor of four. E. Not covered in the assigned reading. Which of the following is the interference that results when two waves with similar orientations but unequal amplitudes are added together to form the resultant wave? A.* constructive B. destructive C. complete constructive D. complete destructive E. Not covered in the assigned reading. A student sends a pulse traveling on a taut rope with one end attached to a post. What will the student observe? A. The pulse will not be reflected if the rope is free to slide up and down on the post. B. The pulse will be reflected and inverted if the rope is free to slide up and down on the post. C.* The pulse will be reflected and inverted if the rope is fixed to the post. D. The pulse will not be inverted if the rope is fixed to the post. E. Not covered in the assigned reading. Standing waves are produced by periodic waves of A. any amplitude and wavelength that are traveling in the same direction. B. the same amplitude and wavelength that are traveling in the same direction. C. any amplitude and wavelength that are traveling in opposite directions. D.* the same frequency, amplitude, and wavelength that traveling in opposite directions. E. Not covered in the assigned reading. 2. 3. 4. 5. 6. 7. 8. 9. 10. Distributed By: Tyrone G Carter TGC ...
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This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at University of California, Berkeley.

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