Physics Final prep
The height to which an object has risen is determined by using a reference level, the position where PE is defined to be 0 1 2 3
0
if you were to place the polarizing axes of two polarizing filters at 90 degrees to each other, what percent of light intensity would pass through 0% 50% 100% 75%
0%
The note C has a frequency of 262 Hz. What length of a closed organ pipe would needed to play a C note? a. 3.05 m c. 1.31 m b. 0.327 m d. 32.7 m
0.327 m
A sound wave traveling with a velocity of 330 m/s has a frequency of 495 Hz. What is its wavelength? a. 1.5 m c. 163 km b. 0.667 km d. 33 m
0.667 km
What is the MA of the pulley shown at the bottom left of the page 0 1 2 3
1
Light from the sun takes about 8 min to reach the earth how far away is the sun 2.4 x 10^9 1.4 x 10^10 1.4 x 10^8 2.4 x 10^9
1.4 x 10^8
A galaxy is moving away at 5.8x10^6 m/sec its light appears to observers to have a frequency of 5.6x10^14 what is the emitted frequency of the light 1.1x10^13 HZ 5.5x10^14 Hz 5.7x10^14 Hz 6.2x10^14 Hz
5.7x10^14 Hz
What will an ammeter read in a circuit where V = 24V and R = 4Ω? 24 A 6 A 12 A 4 A
6 A
What is the thermal energy supplied in 1 minute by an appliance with a power dissipation of 1.2 kW? 1.2 kJ 0.02 kJ 72 kJ 43.2 kJ
72 kj
What is the luminance of a table lighted by a 1750-lm light 4 m above 8.44 lx 34.8 lx 139 lx 84.4 lx
8,44 lx
Lightening is a result of _______. charge separation charging by grounding charging by induction charging by conduction
Charge separation
When two waves with displacements in the same direction exist in the same place at the same time, what will be the effect? a. A standing wave will result. b. Destructive interference will occur. c. Constructive interference will occur. d. A reflected wave will result.
Constructive interference will occur.
Why must Coulomb's law be modified for charged wires? a wire cannot have an induced charge a wire cannot hold a charge Coulomb's law is valid for a point charge a sphere needs to be present
Coulomb's law is valid for a point charge
which represents mechanical energy of a system Esubo=MC^2 E=KE+PE PE=mgh ME+K+P
E=KE+PE
What is a difference between the force of electric charge and that of gravity? electric force can be added or removed from and object gravity cannot gravity is only in one direction, electric force is in all directions electric charge is stored in a desktop, gravity is no. gravity does not have an effect on tape, electric force does.
Electric Force can be added or removed from an object gravity cannot
In the illustration the kinetic energy after throwing the ball is ______ the kinetic energy before plus the input work Equal to less than more than opposite to
Equal to
Energy of motion is called? Kinetic energy Potential energy Work Power
Kinetic Energy
The work-energy theorem states when work is done on an object, the result is a change in Kinetic energy Potential energy Power Work-energy
Kinetic energy
What does the resistance of a machine divided by the effort force equals Efficiency Ideal Mechanical Advantage Mechanical Advantage Torque
Mechanical Advantage
_______ Is the kinetic energy of an object, proportional to the object's moment of inertia and the square of its angular velocity Elastic kinetic energy Gravitational kinetic energy Potential kinetic energy Rotational Kinetic Energy
Rotational Kinetic Energy
Why is a string instrument tuned by changing the tension on the strings? a. The frequency of a string depends on the tension of the string. b. A tighter string can produce a pure sound. c. The strings will strike the sounding board if the tension is right. d. The cross-sectional areas of the strings are very small.
The frequency of a string depends on the tension of the string.
Why can't sound waves travel in a vacuum? The pressure is too low in a vacuum. The vibrations would not be detected. The temperature cannot be raised high enough. There are no particles to collide.
There are no particles to collide.
Which Equation represents work? KE=1/2mv^2 W=Fd W=DeltaKE W=Fd cos theta
W=Fd
What unit is used to measure power? Joules Kilo-joules Ohms Watts
Watts
Which is not an example of periodic motion? a. vibrating guitar string c. clock pendulum b. a rolling ball d. a swinging swing
a rolling ball
-273.15 C is known as _____ absolute zero the freezing point the point of radiation specific heat
absolute zero
Pitches that are consonant are related by _________. a. their timbre b. the number of fundamentals they have c. their octave d. amplitude
amplitude
Sound level is a measure of ________. a. frequency c. wavelength b. amplitude d. pitch
amplitude
In ________, the pressure of the reflected wave is inverted. a. a closed pipe resonator c. a tuning fork b. a musical instrument d. an open-pipe resonator
an open-pipe resonator
The right angle between the normal and the reflected wave is ________. a. angle of incidence c. normal angle b. angle of reflection d. perpendicular angle
angle of reflection
How can a neutral object become charged? by being dipped in water by adding or removing electrons by being stuck to a desk with tape by allowing gravity to work on it
by adding or removing electrons
How can you determine if an electroscope is negatively or positively charged? by adding a negative charge by touching a rod of known charge to the knob of the electroscope by adding a positive charge by applying an electric current to it
by touching a rod of known charge to the knob of the electroscope
What instrument is shown here anemometer calorimeter barometer thermometer
calorimeter
Charging an object without touching it is ______. charge separation. charging by grounding charging by induction charging by conduction
charging by induction
A battery can be used to convert what to electric energy? electric current chemical energy electrons metal particles
chemical energy
What is the name for the process by which kinetic energy is transferred from particle to particle when they collide conduction convection heat transfer radiation
conduction
Which is an example of a good conductor? a plastic comb dry wood copper wire a winter coat.
copper wire
Why can a prism break white light up into different colors different colored light has different wavelengths certain parts of a prism let only certain colors of light through the colors are changed by addition this is an example of color by subtraction
different colored light has different wavelengths
Refraction means a change ________ in of waves. a. wavelength c. frequency b. direction d. velocity
direction
A ______ Machine has equal output and input and its efficiency is 100 percent compound efficient ideal real
efficient
the type of collision in which kinetic energy does not change is called elastic collision inelastic collision mechanical collision preserved collision
elastic collision
Ampere is a unit of _______. potential difference electric current potential energy power
electric current
What are sound pressures converted to by the human ear? sound energy electrical impulses brain vibrations it is still unknown
electrical impulses
A wave carries ________. a. energy c. water b. particles d. light
energy
______ is the measure of the disorder in a system entropy fusion disarray work
entropy
Which law of thermodynamics states that the change in thermal energy of an object is equal to the heat that is added to the object minus the work done by the object first second third fourth
first
Coulomb's law gives the _____ between two charged bodies. current distance mass force
force
In brass and reed instruments, the length of the tube determines the ________ of the sound vibration. a. frequency c. volume b. amplitude d. pressure
frequency
In an electric circuit diagram, the direction of current flow is _______. from the positive terminal toward the resistor from the negative terminal away from the resistor
from the positive terminal
A pendulum with l = 37.2 cm has T = 1.21 s. Find the acceleration due to gravity. A) g = 9.80 m/s2 B) g = 9.78 m/s2 C) g = 9.99 m/s2 D) g = 10.03 m/s2
g = 10.03 m/s2
Which is an example of a good insulator? aluminum plasma water glass
glass
the amount of energy needed to melt 1 kg of a substance is called the boiling point heat of fusion heat of vaporization specific heat
heat of fusion
What is the term that describes the thermal energy needed to vaporize 1 kg of a liquid boiling point heat of fusion heat of vaporization specific heat
heat of vaporization
what is a candela a unit of measure for luminous flux illuminance luminous intensity illumination
illuminance
which is represented in case 3 of the bar graph elastic collision inelastic collision mechanical collision preserved collision
inelastic collision
What unit is used by electric companies to measure energy sold? kilowatt-hours amperes joules ohms
kilowatt-hours
Resonance causes ________. a. the net force in a simple harmonic motion to change direction b. oscillations to reach equilibrium c. large-amplitude oscillations d. gravity to act upon a weight on a spring
large-amplitude oscillations
the _______ States that the energy in a closed isolated system can neither be created nor destroyed law of conservation of energy law of conservation of mass law of mechanical energy law of thermal energy
law of conservation of energy
The words "voltage across" are associated with a ________ connection? parallel series voltmeter ammeter
parallel
A transverse wave travels ________ to the direction of the wave's motion. a. at various angles c. parallel b. longitudinal d. perpendicular
perpendicular
In the illustration on the right, the force is _____ to the direction of motion equal parallel perpendicular opposite
perpendicular
The equation PE=mgh represents elastic kinetic energy gravitational kinetic energy potential kinetic energy rotational kinetic energy
potential kinetic energy
What is the rate at which energy is changed? power resistance current potential difference
power
Which of the following light combinations is incorrect red plus green produces yellow red plus yellow produces magenta blue plus green produces cyan blue plus yellow produces white
red plus yellow produces magenta
What is not a luminous source fluorescent light bulbs computer monitors reflectors on a highway a flashlight
reflectors on a highway
Which can remove thermal energy from a colder object and add it to a warmer object dishwasher microwave oven refrigerator
refrigerator
Charges are created ________. separately in pairs from the force of gravity between oppositely charged objects
seperately
In the equation for the Doppler effect, what does vs = 0 mean? a. stationary detector, source in motion b. stationary source, detector in motion c. stationary source and detector d. moving source and detector
stationary source, detector in motion
Which would NOT store elastic potential energy rubber ball rubber band steel pole trampoline
steel pole
What did hubble observe to conclude that the universe is expanding the doppler effect was not useful for distant objects it took longer for light to reach earth for some galaxies the galaxies were sending red shifted light to earth the light from distant galaxies was refracted by objects in space
the galaxies were sending red shifted light to earth
Which part of the human body acts as a fulcrum when you walk the foot the head the hip the thigh
the hip
The speed of a mechanical wave depends on ________. a. the energy force of the wave b. the height of the crest of the wave c. the medium through which it travels d. the quantity of out-of-phase particles
the medium through which it travels
Energy that causes the temperature of objects to rise is called _______ energy kinetic potential thermal static
thermal
_______ is the state in which the rate of energy flow between two objects is equal and the objects are at the same temperature dynamic equilibrium temperature limit thermal equilibrium thermometry
thermal equilibrium
the study of heat transformation into other forms of energy is called conduction entropy thermal equilibrium thermodynamics
thermodynamics
Why are superconductors often impractical? they are too expensive they are too large for everyday use they must be kept at very low temperatures there are no superconducting materials available today
they must be kept at very low temperatures
Why does voltage from a generating plant need to be high? to improve resistance high voltage is needed for homes and businesses to make use of the vast hydroelectric potential to reduce energy waste
to reduce energy waste
Due to the Doppler effect, the ________ of a sound increases as the source approaches you. a. amplitude c. wavelength b. speed d. sound level
wavelength
What type of simple machine is an axe splitting wood inclined plane lever screw wedge
wedge
What color(s) are reflected from a yellow flower petal red and blue yellow yellow and red all colors of the spectrum
yellow
