# Shared Flashcard Set

## Details

Physics
NAVEDTRA 14028 Ch1
71
Physics
Not Applicable
08/26/2013

Term
 Magnitude, Direction, Time
Definition
 What are the three categories of measurement?
Term
 Metric unit
Definition
 What unit of measurement is used to express scientific measurements?
Term
 .09144 meters
Definition
 What is the english equivalent of 1 yard?
Term
 Mass is quantity of matter that doesnt change.Weight of a body is the force that attracts towards earth.
Definition
 Difference between mass of a body and weight of a body?
Term
 The person has the same pull of gravity that a mass of 195 would when near sea level.
Definition
 What is meant when a person is described as weighing 195 pounds?
Term
 Combinations of two or three fundamental units expressed as some combination of units. ex. watt=joule per second.
Definition
 How are derived units constructed?
Term
 Velocity=Vector quantity or speed in a given direction.Speed=Body moving along a path w/o reference to direction
Definition
 What is the difference between speed and velocity?
Term
 Foot-Pound
Definition
 What term is defined as the work done in lifting 1 pound a distance of 1 foot against the force of gravity.
Term
 Force, Distance, Time
Definition
 List the measurements included in the units of power.
Term
 Impenetrability of Matter
Definition
 What is the concept "two objects cant occupy the same space at the same time"?
Term
 A push or pull that exerts a force on the body.
Definition
 What action must be applied to an object to overcome inertia?
Term
 An increase or decrease in speed and/or change in direction of motion.
Definition
 What is meant by the term acceleration?
Term
 It has both direction and speed.
Definition
 Why is force considered a vector quantity?
Term
 The gravitational force exerted by the earth on the body, known as weight of that body, expressed in force units.
Definition
 In english system, what force is expressed in pounds?
Term
 It is its weight per unit volume.
Definition
 How is the density of a substance described?
Term
 It is the ratio of the density of the substance to the density of water.
Definition
 How is specific gravity of a substance described?
Term
 Kinetic energy (Moving bodies have energy because they can do work.)
Definition
 What term describes the energy of mass in motion?
Term
 The combination and arrangement of subatomic particles.
Definition
 What gives a substance its distinguishing characteristics?
Term
 Electron Neutron, Proton
Definition
 List the three subatomic particles of the atom?
Term
 Equal # of protons and electrons.
Definition
 What is a balanced atom?
Term
 # of protons in its nucleus.
Definition
 How is the atomic number of an element determined?
Term
 # of protons and neutrons in its nucleus.
Definition
 How is the atomic weight of an element determined?
Term
 Inert.
Definition
 The outer electron shell of each atom of an element is completely filled. What type of element is this?
Term
 molecule
Definition
 Name the smallest unit that exhibits the distinguishing characteristics of a compound
Term
 The electron outer shell only. No change in either nucleus, electrons rearrange.
Definition
 In forming a compound, what part of the atom changes?
Term
 Study kinetic theory of gasses.
Definition
 What is one main use of absolute zero?
Term
 O K, -273 C
Definition
 List absolute zero on Celsius and Kelvin scales.
Term
 Boyle
Definition
 "For a constant temperature, the product of the volume and pressure of an enclosed gas remains constant"
Term
 Mechanics
Definition
 Name branch of physics that deals with force, mass and motion.
Term
 The point where a single force, equal to the gravitational force and directed up, sustained the body at rest.
Definition
 Describe the point of an object that is its center of gravity.
Term
 Rotation and revolution
Definition
 List the two classes of circular motion.
Term
Definition
 A gyro rotor revolves OR rotates around its axis?
Term
 Translational force
Definition
 What type of force is an accelerating force applied to the center of gravity of a body so that the body is accelerated with no rotation?
Term
 work: 50x5 =250 ftlbs of workPower: 250/15sec=16.666 ftlbs a sec
Definition
 Power expanded. 50 lbs 5ft in 15 sec?
Term
 When it can do work, such as a wound clock spring or compressed gas.
Definition
 When does an object have potential energy?
Term
 Efficiency.
Definition
 What is lost whenever energy is expanded?
Term
 Friction
Definition
 What is the most common reason for efficiency loss in mechanical physics?
Term
Definition
 What is the principle that allows man to accomplish work that he normally couldn't do.
Term
 Centripetal force.
Definition
 What force prevents a revolving object from continuing along a straight line?
Term
 Centrifugal force.
Definition
 When an object is revolving, what force tries to oppose centripetal force?
Term
 Transmission, Reflection, Refraction, Absorption.
Definition
 What are characteristics all waves have?
Term
 Transverse waves- disturbance takes place at right angles to the direction of propagation.
Definition
 Electromagnetic waves are what type of waves?
Term
 If it reached he boundary of a media or an area within the media where the velocity of propagation of the wave changes
Definition
 A ray is traveling through a medium in a straight line. What would cause the ray to change its direction?
Term
 The path of a ray reflected from a surface forms an angle that is exactly equal to the one formed by the path of the ray reaching the medium.
Definition
 Why is the angle of incidence equal to the angle of reflection?
Term
 As a wave travels through one medium it is traveling at a specific velocity of propagation. when it reaches a new medium, the velocity of propagation changes. If the ray is not perpendicular to the boundary between the two media, the ray will change direction and bend. this is refraction.
Definition
 As a wave passes from one medium into another, what causes refraction?
Term
 Angle of incidence, index of refraction.
Definition
 What are the two factors that determine the angle of refraction?
Term
 When the path of waves is bent because of an obstruction.
Definition
 what causes diffraction?
Term
 Relative motion btwn source and detector. Frequency at detector differs from frequency at source.
Definition
 What causes the doppler effect?
Term
Definition
 Three methods of heat transfer?
Term
 5/9(96-32)= 5/9x64= 35.5 C
Definition
 96F in C?
Term
 Transmitted through the substanceReflected by the substanceAbsorbed by the substance
Definition
 Effects on light waves when they meet a substance?
Term
 1Total light produced by a source.2Amount of light received per unit area at a distance from the source.
Definition
 What is luminous intensity? What is intensity of illumination?
Term
 Intensity of incident light
Definition
 Whaat is measured by the footcandle?
Term
 Lumen
Definition
 What term describes the output of a light bulb?
Term
 Focus a beam of light. Change direction of a beam. Intensify illumination of an area.
Definition
 Principle use of reflectors?
Term
 It is refracted
Definition
 What happens when light passes through a transparent substance?
Term
 Red, green, blue
Definition
 Primary colors of light frequencies?
Term
 White light.
Definition
 If you mix primary colors, you get?
Term
 A source, A medium for transmission, A detector
Definition
 List the three components that are required by sound.
Term
 Density, Elasticity
Definition
 List the two properties of a medium that govern the velocity of sound as it passes through the medium.
Term
 Elasticity of water is 15230 times that of air, travels four times faster.
Definition
 Why does sound travel faster in water than air?
Term
 If temp drops, density increases, velocity of sound decreases.
Definition
 Velocity of sound is lower at high altitudes because....
Term
 Pitch, Intensity, Quality
Definition
 Three characteristics of sound?
Term
 The threshold of audibility and the threshold of feeling.
Definition
 Two terms to describe range of sound the human ear can distinguish.
Term
 Logarithmically
Definition
 how do sound units vary with the amplitude of variations?
Term
 Difference btwn sounds of unequal intensity. Decibel describes ratio of two sound levels.
Definition
 The units of sound measurement are the bel and the decibel. they vary logarithmically with the amplitude of the sound variations. To what do the bel and decibel refer?
Term
 Electrical powers or acoustical powers.
Definition
 In sound system engineering, what ratio does dB express?
Term
 Gain of amp, Output of microphone, Power in a circuit compared to a chosen reference level.
Definition
 Name some of the uses of the decibel as it is used to express an electrical power ratio.
Term
 A reflection of sound waves
Definition
 What causes an echo?
Term
 1Cover surface with a material that absorbs sound and reduces intensity. 2Change contour of surface and aim reflected sound somewhere's. 3change the position of loudspeaker. 4Vary the amp or pitch of signal.
Definition
 A loudspeaker is being used in a large room producing considerable echo that limits its usefulness. List four ways it can be corrected.
Term
 20-20,000Hz
Definition
 Audible sound freq? Human can hear
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