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