Multiple Choice Questions

Nodes
  • remains the same, but the RPMs decrease.
  • Sues's wheels have the greater rotational speed
  • nearest the rim.
  • Nodes are the regions of minimal or zero displacement
A weight suspended from a spring is seen to bob up and down over a distance of 30 cm twice each second.what is its amplitude?
  • 1 kg
  • 60 Hz
  • 15 cm
  • 2.0 Hz
standing waves
  • When the frequency of the external forcedvibrations on an object matches the object'snatural frequency, a dramatic increase inamplitude occurs
  • at the center of the disk.
  • the average position of weights distribution
  • When two sets of waves of equal amplitudeand wavelength pass through each other inopposite directions, stable regions ofconstructive and destructive interference areproduced
Centripetal Force: F=mv^2/rCalculate the tension in a horizontal string that whirls a 2.2-kg toy in a circle of radius 2.2 m when it moves at 3.4 m/s on an icy surface.
  • doubles.
  • higher
  • d= 17m
  • F= 12N
longitudinal waves
  • the direction of motion (to and fro) of the medium is parallel to the wave propagation direction
  • The overlapping of waves of the same frequencycan form the interference phenomenon resultingan increase, decrease or no-effect to themedium.
  • the motion of the medium is perpendicular to the direction of the wave
  • the regions of maximum displacement
Three wavelengths long?
  • 5
  • steel.
  • long.
  • 0.
normal sound frequency range
  • 1/60 hertz.
  • 20-20,000 Hz
  • decrease
  • m = 0.77 kg
What is the period, in seconds, that corresponds to each of the following frequencies?0.2 Hz
  • repulsive interaction.
  • N = 2 electrons
  • the resultant forces and torques must both be zero.
  • 5.0 s
angular momentum
  • decrease
  • =lw
  • average position of all the mass that makes up the body.
  • a periodic change both in space and time
A grunting porpoise emits sound at 57 Hz .What is the wavelength of this sound in water, where the speed of sound is 1500 m/s?
  • Yes
  • 2 m/s.
  • 26 m
  • 1 kg
What is the frequency, in hertz, that corresponds to each of the following periods?5.0 s
  • upward.
  • 0.20 Hz
  • λ = 1.1 m
  • 1.3 kg
transverse waves
  • When two sets of waves of equal amplitudeand wavelength pass through each other inopposite directions, stable regions ofconstructive and destructive interference areproduced
  • a wave reflects upon itself.
  • reflection of sound
  • the motion of the medium is perpendicular to the direction of the wave
What is the wavelength of a 31000-Hz ultrasonic wave in air?
  • loosely bound.
  • 0.5 hertz.
  • λ = 1.1×10^−2 m
  • electrical
An energy of 0.12 J is stored in the metal sphere on top of a Van de Graaff generator. A spark carrying 0.50 micro-coulomb (5.0×10−7 C ) discharges the sphere.Find the sphere's potential relative to ground.
  • h= 4400m
  • V = 2.4×10^5 V
  • positively charged.
  • F= 7.7 N
Dan and Sue cycle at the same speed. The tires on Dan's bike are larger in diameter than those on Sue's bike. Which wheels, if either, have the greater rotational speed? Dan's wheels have the greater rotational speed. Sue's wheels have the greater rotational speed. They have the same rotational speed.
  • The balls would begin to move closer together.
  • It does not deflect at all.
  • remains the same, but the RPMs decrease.
  • Sues's wheels have the greater rotational speed
Resonance
  • the regions of maximum displacement
  • When the frequency of the external forcedvibrations on an object matches the object'snatural frequency, a dramatic increase inamplitude occurs
  • Some electrons in conductors are weakly attached to the atoms, and all electrons in insulators are strongly attached to the atoms.
  • average position of all the mass that makes up the body.
wave interference
  • When the frequency of the external forcedvibrations on an object matches the object'snatural frequency, a dramatic increase inamplitude occurs
  • the motion of the medium is perpendicular to the direction of the wave
  • When two sets of waves of equal amplitudeand wavelength pass through each other inopposite directions, stable regions ofconstructive and destructive interference areproduced
  • The overlapping of waves of the same frequencycan form the interference phenomenon resultingan increase, decrease or no-effect to themedium.
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in sea-water. The time delay of the echo to the ocean floor and back is 5.75 s .Find the depth of the water directly below the vessel
  • increases
  • τ = 6.0 Nm
  • h= 4400m
  • λ = 1.1 m
You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see the hammering stop.Calculate the distance of sally from you
  • d= 4400km
  • 1 kg
  • F= 540N
  • d= 340m
If the force of friction that keeps a 90-kg person sitting on the edge of a horizontal rotating platform when the person sits 2.2 m from the center of the platform and has a tangential speed of 6.2 m/s , what will be the person's angular momentum?
  • λ = 1.1×10^−2 m
  • 3
  • L= 1200 kg⋅m2/s
  • becomes shorter.
What is the wavelength of a 310-Hz tone in air?
  • λ = 1.1 m
  • electrical
  • straight.
  • increase.
echo
  • attract each other.
  • reflection of sound
  • Felec/Fgrav = 2⋅10^39
  • positively charged.
Can a force produce a torque when there is no lever arm? (y/n)
  • Yes
  • No
  • two.
  • GeV
The basic reason why things become electrically charged is that the atoms (or molecules) of some materials hold on to their _______ better than those of other materials.
  • increase.
  • electrons
  • 6 hertz.
  • rotation.
If a drop of mass 1.2×10−14kg remains stationary in an electric field of 3.675×105N/C, what is the charge of this drop?
  • outside horse
  • positively charged
  • Q = 3.2×10^−19 C
  • an unbalances torque
antinodes
  • faster in helium than in air.
  • the regions of maximum displacement
  • at right angles to the direction of wave travel.
  • The balls would begin to move closer together.
Two pellets, each with a charge of 0.70 microcoulomb (7.0×10−7 C ), are located 2.4 cm (2.4×10−2 m ) apart.Find the electric force between them.
  • shorter
  • a proton.
  • 15 cm
  • F= 7.7 N
A glass marble is rubbed against a piece of silk. As a result the piece of fabric acquires extra electrons. What happens to the glass marble?Check all that apply. The marble has lost the same number of electrons acquired by the piece of silk. The marble has acquired the same number of electrons acquired by the piece of silk. The marble acquires a positive charge and repels the piece of silk. The marble acquires a positive charge and attracts the piece of silk. The marble acquires a negative charge and attracts the piece of silk. The marble acquires a negative charge and repels the piece of silk.
  • -the marble has lost the same number of electrons acquired by the piece of silk-the marble acquires a positive charge and attracts the piece of silk
  • Marbles 1 and 2 repel each other, but no interaction occurs with marble 3.
  • The overlapping of waves of the same frequencycan form the interference phenomenon resultingan increase, decrease or no-effect to themedium.
  • the direction of motion (to and fro) of the medium is parallel to the wave propagation direction
To see why, calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10−10m. The charges and masses are given in the textbook.
  • electrons that surround the nucleus.
  • Felec/Fgrav = 2⋅10^39
  • near the outside.
  • not enough information to say
A droplet of ink in an industrial ink-jet printer carries a charge of 2.1×10−10 C and is deflected onto paper by a force of 2.9×10−4 N .Find the strength of the electric field to produce this force
  • E = 1.4×10^6 Vm
  • toward you.
  • F= 540N
  • an unbalances torque
Two point charges are separated by 6.0 cm . The attractive force between them is 22 N . Suppose that the charges attracting each other have equal magnitude.Rearrange Coulomb's law and find the magnitude of each charge.
  • Q = 3.0×10^−6 C
  • 1/9 E0
  • E = 1.4×10^6 Vm
  • h= 4400m
To tighten a bolt, you push with a force of 78 N at the end of a wrench handle that is 0.20 m from the axis of the bolt.What torque are you exerting?
  • 16 Nm (78 x 0.20)
  • positively charged.
  • Both A and B are correct.
  • m = 0.77 kg
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be F. F/2 F. F/none of these
  • 2 m/s.
  • F/2
  • Yes
  • two.
How many extra electrons are on this particular oil drop (given the presently known charge of the electron)?
  • m = 0.77 kg
  • near the outside.
  • becomes shorter.
  • N = 2 electrons
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is 3.0 m. 300 m. 0.003 m. 30 m. none of these
  • 3.0 m
  • coin.
  • 10 Hz
  • 1/9 E0
A ball rolls down a hill mainly because of its angular acceleration. its angular momentum. an unbalanced torque. a balanced torque. its rotational inertia.
  • at the center of the disk.
  • It decreases.
  • an unbalances torque
  • doubles.
What is the frequency, in hertz, that corresponds to each of the following periods?1/60 s
  • τ = 6.0 Nm
  • long.
  • 60 Hz
  • 10 Hz
The rock and meterstick balance at the 25-cm mark, as shown. The meterstick has a mass of 1.3 kg . What must be the mass of the rock?
  • straight.
  • 1.3 kg
  • 60 Hz
  • 0.50 s
Torque = Lever Arm × ForceCalculate the torque produced by a 40-N perpendicular force at the end of a 0.15-m-long wrench.
  • τ = 6.0 Nm
  • 0.5 hertz.
  • 15 cm
  • 26 m
What is the period, in seconds, that corresponds to each of the following frequencies?10 Hz
  • F= 7.7 N
  • numbers of revolution per second
  • 5.0 s
  • 0.10 s
Do your answers depend on the direction of your push relative to the direction of the wrench handle?
  • F/2
  • Yes
  • double.
  • low.
How many nodes, not including the endpoints, are there in a standing wave that is two wavelengths long?
  • GeV
  • 2.0 Hz
  • Yes
  • 3
vibrating
  • average position of all the mass that makes up the body.
  • anything that moves back and forth, side to side, in and out, or up and down is vibrating
  • the motion of the medium is perpendicular to the direction of the wave
  • electrons that surround the nucleus.
The potential difference between a storm cloud and the ground is 100 million V.If a charge of 1.4 C flashes in a bolt from cloud to Earth, what is the change of potential energy of the charge?
  • E = 1.4×10^8 J
  • L = 440 kg⋅m2/s
  • λ = 1.1×10^−2 m
  • m = 0.77 kg
mechanical wave
  • waves produced by the vibrations of matter
  • the direction of motion (to and fro) of the medium is parallel to the wave propagation direction
  • amplitude, frequency, wavelength, and speed.
  • a periodic change both in space and time
Calculate the force of friction that keeps a 75-kg person sitting on the edge of a horizontal rotating platform when the person sits 2.0 m from the center of the platform and has a tangential speed of 3.8 m/s .
  • F= 540N
  • 3.0 m
  • 60 Hz
  • d= 340m
sounds
  • a wave reflects upon itself.
  • average position of all the mass that makes up the body.
  • waves produced by the vibrations of matter
  • When the frequency of the external forcedvibrations on an object matches the object'snatural frequency, a dramatic increase inamplitude occurs
0 h : 0 m : 1 s

Multiple Choice Questions
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