# Shared Flashcard Set

## Details

Final Exam
In class quizzes
85
Physics
12/14/2010

Term
 The force of friction on an object on a level floor that does not move when you push it is...
Definition
 equal to the force of your push
Term
 The mass of a sliding block is somehow tripled, and at the same time, the force applied on it is also tripled. How does its acceleration compare to its original acceleration?
Definition
 it remains the same as before
Term
 What is the acceleration of a falling object that has obtained terminal velocity?
Definition
 0 m = s^2
Term
 What best describes the relation between speed and velocity:
Definition
 velocity includes speed and direction of motion
Term
 A car is moving at 90 km/h and it rounds a corner, also at 90 km/h. Which is true?
Definition
 The car is accelerating and the car moves at constant velocity
Term
 What did Galileo discover about the speed of a ball rolling freely down an incline?
Definition
 it increases by the same amount each second
Term
 If a moving car doubles its speed, which of the following are doubled?
Definition
 its momentum
Term
 An apple hanging from a limb has potential energy because of its height. If it falls, what becomes of this energy just before it hits the ground?
Definition
 it becomes nearly all kinetic energy
Term
 Which requires more work:
Definition
 lifting a 200 kg sack a distance of  five meters.
Term
 Which remains the same for a 10 omhs and a 20 omhs resistor wired in series in a series circuit?
Definition
 the current through each resistor.
Term
 If the voltage impressed across a circuit is held constant while the resistance doubles, what change occurs in the current?
Definition
 it decreases to half its former value
Term
 What best describes the relationship between power, voltage and current?
Definition
 Power is voltage times current
Term
 Which of the following can be used to distinguish longitudinal waves from transverse waves?
Definition
 Polarization
Term
 Interference is a property seen in...
Definition
 sound waves, waves in a slinky, light waves
Term
 Is diffraction more pronounced through a small opening or through a large opening?
Definition
 small opening
Term
 What produces an electromagnetic wave?
Definition
 vibrating electric charge
Term
 Which of the following can be used to distinguish between light and an radio wave?
Definition
 a radio wave has a smaller frequency than light
Term
 In which medium does light travel faster, air, or water?
Definition
 air
Term
 A device that converts mechanical energy to electrical energy is a...
Definition
 generator
Term
 A transformer works best with...
Definition
 AC current
Term
 What is induced by the rapid alternation of an electric field?
Definition
 a magnetic field
Term
 In a circuit with two resistors in series, the...
Definition
 current through each resistor must be the same
Term
 In a circuit with two resistors in parallel, the...
Definition
 voltage across each resistor must be the same
Term
 A wire carries a current of 2 Amps. In 10 seconds the total charge that passes through the wire is...
Definition
 20 C
Term
 A wire carries a current of 2 Amperes for 10 seconds. What is the net charge on the wire during that time?
Definition
 Nearly zero
Term
 The electrons in a metal wire that forms part of an electrical circuit come from...
Definition
 the wire itself
Term
 Can an electron at rest in a magnetic field be set into motion by it?
Definition
 No
Term
 Can an electron at rest in an electric field be set into motion by it?
Definition
 Yes
Term
 How would an electron and a proton moving at the same speed in the same magnetic field behave compared to each other?
Definition
 They are deflected in opposite directions, but the electron is deflected more than the proton
Term
 Electromagnetic induction may be caused by:
Definition
 a sudden power surge in an electric circuit and moving a wire inside a magnetic field
Term
 When a magnet is plunged in and out of a coil of wire, voltage is induced in the coil. If the rate of the in-and-out motion is doubled, the induced voltage
Definition
 doubles
Term
 If instead the number of loops in the coil is doubled, the induced voltage
Definition
 doubles
Term
 Electrons flow from
Definition
 low potential to high
Term
 You move +2 C from 0 V to +120 V. How much work must you do?
Definition
 240 J
Term
 How much potential energy does the charge gain?
Definition
 240 J
Term
 Now you move -1 C through the same potential difference. What is the change in potential energy now?
Definition
 -120 J
Term
 What is the speed of an electromagnetic wave that has a frequency of 10,000 Hz?
Definition
 300,000 km/s
Term
 Which of the following can be used to distinguish between light and an X-ray?
Definition
 An X-ray has smaller wavelength than light
Term
 What produces an electromagnetic wave
Definition
 Vibrating electric charge
Term
 An electromagnetic wave consists of
Definition
 Oscillating electric charge
Term
 The color of light with the lowest frequency is
Definition
 Violet
Term
 Two cars, one twice as heavy as the other, move down a hill at the same speed. Compared with the lighter car, the heavier car has
Definition
 double
Term
 A bug hits the windshield of a bus as it travels down the highway. Which experiences the greater change in momentum?
Definition
 Neither
Term
 For which kind of collision is momentum conserved?
Definition
 both inelastic and elastic
Term
 A hammer hits a nail into a block of wood. Identify the reaction force to this action.
Definition
 the nail pushing against the hammer
Term
 Superman, reknowned man of steel dashes into outer space to save the world from an incoming asteroid. He uses his super strength, capable of exerting force enough to lift the asteroid were it on the earth, to hurl the asteroid towards the sun. Which of the following most likely describes the resulting motion?
Definition
 Superman will be knocked back a bit when pushing the asteroid, but given his super strength, the asteroid will move forwards more.
Term
 Which has a greater momentum- a heavy truck at rest or a moving skate-board?
Definition
 the skateboard
Term
 Which requires more impulse? A ball that is caught, or the same ball, caught and then thrown back again? (Assume it is initially travelling at the same speed each time)
Definition
 the one that is caught and thrown back
Term
 Your friend says that the law of momentum conservation is violated when a ball rolls down a hill and gains momentum. Is this true or false? Why?
Definition
 True: gravity is its external force and the ball accelerates
Term
 What is the period of the second-had of a clock?
Definition
 60 s
Term
 What is the frequency of the second-hand of a clock?
Definition
 1/ 60 Hz
Term
 Which of the following contributes to the natural frequency of an object?
Definition
 its stiffness
Term
 Which of the following characterizes sound waves in air?
Definition
 they are longitudinal
Term
 the relationship between wave speed, wavelength and frequency is
Definition
 speed is frequency times wavelength
Term
 In what direction do the vibrations of a longitudinal wave occur, relative to the direction of travel of the wave?
Definition
 parallel to the direction of travel
Term
 Which of the following characterizes sound waves in air?
Definition
 they are longitudinal
Term
 the speed of an object is doubled. which of the following are true:
Definition
 its momentum is doubled
Term
 A car going 15mph takes 10m to come to a stop. How far will the same car going 45mph take to stop, if the same force is applied on the brakes?
Definition
 30 m
Term
 Two identical cars going at the same speed, but in opposite directions collide head on and come to a stop. Which are conserved?
Definition
 momentum only
Term
 What is it that a body having energy is capable of doing?
Definition
 Doing work on another object
Term
 A car is travelling on a smooth flat road and comes to a stop. The work done by the car in stopping
Definition
 is equal to the change in kinetic energy of the car
Term
 A car is lifted a certain distance in a service station and therefore has potential energy (PE) relative to the floor. If it were lifted twice as high, how much PE would it have?
Definition
 Twice the original PE
Term
 A car slows down as a result of air friction. Which is true?
Definition
 the car's kinetic energy decreases, heat is generated, and the energy of the car+road+air taken together is constant.
Term
 The work done by the car in stopping
Definition
 is equal to the change in the kinetic energy of the car.
Term
 the relationship between wave period and wave frequency is
Definition
 the period is the inverse of the frequency
Term
 two waves that meet at the same point in space
Definition
 intefere
Term
 a node is
Definition
 a point where a standing wave has zero displacement.
Term
 according to Galileo's (also Newton's) law of inertia, if we could somehow take way the gravitational force between a planet and the sun, the planet would
Definition
 move away from the sun in a straight line
Term
 What is the net force on an object pulled the right with 30 pounds and to the left with 40 pounds?
Definition
 10 pounds to the left
Term
 Consider a book that weighs 20N at rest on a flat table. The support force felt by the book is
Definition
 20 Newtons, provided by the table
Term
 Relative tom the distance of an object in front of a plane mirror, how far behind the mirror is the image?
Definition
 the same as the distance from object to mirror
Term
 What physical property of light is most responsible for the phenomenon of mirages:
Definition
 refraction
Term
 Which travels more slowly in glass--red light or violet?
Definition
 violet
Term
 Polarization is a characteristic of
Definition
 transverse waves
Term
 is diffraction more pronounced through a small opening or through a large opening?
Definition
 small
Term
 How is the energy of a photon related to its vibrational frequency?
Definition
 the energy is proportional to the frequency
Term
 A gamma ray are actually
Definition
 a photon with an energy higher than an X-ray
Term
 What did the physicist Henri Becquerel discover about Uranium?
Definition
 it spontaneously emits X-rays
Term
 Consider a two-split interference experiment as studied in lab. As the distance between two slits increases, the pattern of fringes (bright and dark spots) that appear on a screen will
Definition
 decrease  (spacing of pattern decreases)
Term
 As the wavelength of laser light shown on the slits, the increases pattern of fringes will
Definition
 increase (spacing of pattern increases)
Term
 Which of the following is evidence for the particle nature of light?
Definition
 photoelectric effect
Term
 Which has the highest energy quanta?
Definition