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Physics Theory #2

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Quiz
Hanzo Conard
Quiz por Hanzo Conard, atualizado more than 1 year ago
Hanzo Conard
Criado por Hanzo Conard quase 8 anos atrás
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Resumo de Recurso

Questão 1

Questão
The average speed of a moving object during a given interval of time is always:
Responda
  • The magnitude of its average velocity over the interval
  • The distance covered during the time interval divided by the time interval
  • One-half its speed at the end of the interval
  • One-half its acceleration multiplied by the time interval

Questão 2

Questão
Of the following situations, which one is impossible
Responda
  • A body having velocity east and acceleration east
  • A body having velocity east and acceleration west
  • A body having zero velocity and non-zero acceleration
  • A body having constant acceleration and variable velocity
  • A body having constant velocity and variable acceleration

Questão 3

Questão
Throughout a time interval, while the speed of a particle increases as it moves along the x axis,its velocity and acceleration might be
Responda
  • Positive and negative, respectively
  • Negative and positive, respectively
  • Negative and negative, respectively
  • Negative and zero, respectively
  • Positive and zero, respectively

Questão 4

Questão
A particle moves on the x axis.When its acceleration is positive and increasing:
Responda
  • Its velocity must be positive
  • Its velocity must be negative
  • It must be slowing down
  • It must be speeding up
  • None of the above must be true

Questão 5

Questão
A particle moves along the x axis according to the equation x = 6t^2, where x is in meters and t is in seconds.Therefore
Responda
  • The acceleration of the particle is 6 m/s2
  • t cannot be negative
  • The particle follows a parabolic path
  • Each second the velocity of the particle changes by 9.8 m/s
  • None of the above

Questão 6

Questão
A ball is in free fall.Its acceleration is:
Responda
  • Downward during both ascent and descent
  • Downward during ascent and upward during descent
  • Upward during ascent and downward during descent
  • Upward during both ascent and descent
  • Downward at all times except at the very top, when it is zero

Questão 7

Questão
A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is
Responda
  • Positive during both ascent and descent
  • Negative during both ascent and descent
  • Negative during ascent and positive during descent
  • Positive during ascent and negative during descent
  • None of the above

Questão 8

Questão
A baseball is thrown vertically into the air.The acceleration of the ball at its highest point is
Responda
  • Zero
  • g,down
  • g,up
  • 2g,down
  • 2g,up

Questão 9

Questão
Which one of the following statements is correct for an object released from rest
Responda
  • The average velocity during the first second of time is 4.9m/s
  • During each second the object falls 9.8m
  • The acceleration changes by 9.8m/s2 every second
  • The object falls 9.8m during the first second of time
  • The acceleration of the object is proportional to its weight

Questão 10

Questão
A freely falling body has a constant acceleration of 9.8 m/s2.This means that
Responda
  • The body falls 9.8 m during each second
  • The body falls 9.8 m during the first second only
  • The speed of the body increases by 9.8 m/s during each second
  • The acceleration of the body increases by 9.8 m/s2 during each second
  • The acceleration of the body decreases by 9.8 m/s2 during each second

Questão 11

Questão
An object is shot vertically upward. While it is rising
Responda
  • Its velocity and acceleration are both upward
  • Its velocity is upward and its acceleration is downward
  • Its velocity and acceleration are both downward
  • Its velocity is downward and its acceleration is upward
  • Its velocity and acceleration are both decreasing

Questão 12

Questão
A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth.Which of the following statements is correct
Responda
  • The maximum velocity of the feather is 9.8 m/s
  • The acceleration of the feather decreases until terminal velocity is reached
  • The acceleration of the feather remains constant during the fall
  • The acceleration of the feather increases during the fall
  • The acceleration of the feather is zero

Questão 13

Questão
The area under a velocity-time graph represents
Responda
  • Acceleration
  • Change in acceleration
  • Speed
  • Change in velocity
  • Displacement

Questão 14

Questão
Displacement can be obtained from
Responda
  • The slope of an acceleration-time graph
  • The slope of a velocity-time graph
  • The area under an acceleration-time graph
  • The area under a velocity-time graph

Questão 15

Questão
An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope
Responda
  • That increases with time
  • That is constant
  • That decreases with time
  • Of 3 m/s
  • Of 3 m/s^2

Questão 16

Questão
Velocity is defined as
Responda
  • Rate of change of position with time
  • Position divided by time
  • Rate of change of acceleration with time
  • A speeding up or slowing down
  • Change of position

Questão 17

Questão
Acceleration is defined as:
Responda
  • Rate of change of position with time
  • Speed divided by time
  • Rate of change of velocity with time
  • A speeding up or slowing down
  • Change of velocity

Questão 18

Questão
Which of the following is a scalar quantity?
Responda
  • Speed
  • Velocity
  • Displacement
  • Acceleration
  • None of these

Questão 19

Questão
Which of the following is a vector quantity?
Responda
  • Mass
  • Density
  • Speed
  • Temperature
  • None of these

Questão 20

Questão
Which of the following is NOT an example of accelerated motion?
Responda
  • Vertical component of projectile motion
  • Circular motion at constant speed
  • A swinging pendulum
  • Earth’s motion about sun
  • Horizontal component of projectile motion

Questão 21

Questão
Two bodies are falling with negligible air resistance, side by side, above a horizontal plane.If one of the bodies is given an additional horizontal acceleration during its descent, it:
Responda
  • Strikes the plane at the same time as the other body
  • Strikes the plane earlier than the other body
  • Has the vertical component of its velocity altered
  • Has the vertical component of its acceleration altered
  • Follows a straight line path along the resultant acceleration vector

Questão 22

Questão
The velocity of a projectile equals its initial velocity added to:
Responda
  • A constant horizontal velocity
  • A constant vertical velocity
  • A constantly increasing horizontal velocity
  • A constantly increasing downward velocity
  • A constant velocity directed at the target

Questão 23

Questão
A stone thrown from the top of a tall building follows a path that is:
Responda
  • Circular
  • Made of two straight line segments
  • Hyperbolic
  • Parabolic
  • A straight line

Questão 24

Questão
Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true? I. The horizontal distance traveled by the bullet is greater for the Moon II. The flight time is less for the bullet on the Earth III. The velocity of the bullets at impact are the same.
Responda
  • I
  • II
  • III

Questão 25

Questão
A bomber flying in level flight with constant velocity releases a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true:
Responda
  • The bomber is over the target when the bomb strikes
  • The acceleration of the bomb is constant
  • The horizontal velocity of the plane equals the vertical velocity of the bomb when it hits the target
  • The bomb travels in a curved path
  • The time of flight of the bomb is independent of the horizontal speed of the plane

Questão 26

Questão
An object is shot from the back of a railroad flatcar moving at 40km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:
Responda
  • In front of the flatcar
  • Behind the flatcar
  • On the flatcar
  • Either behind or in front of the flatcar, depending on the initial speed of the object
  • To the side of the flatcar

Questão 27

Questão
An isothermal process for an ideal gas is represented on a p-V diagram by:
Responda
  • A horizontal line
  • A vertical line
  • A portion of an ellipse
  • A portion of a parabola
  • A portion of a hyperbola

Questão 28

Questão
Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?
Responda
  • Radio waves
  • Visible light
  • X rays
  • Gamma rays
  • All of these travel at the same speed

Questão 29

Questão
An electromagnetic wave is generated by:
Responda
  • Any moving charge
  • Any accelerating charge
  • Only a charge with changing acceleration
  • Only a charge moving in a circle
  • Only a charge moving in a straight line

Questão 30

Questão
In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is:
Responda
  • The speed of light
  • An increasing function of frequency
  • A decreasing function of frequency
  • √2
  • 1/√2

Questão 31

Questão
The relation θ(incident) = θ(reflected),whichapplies as a ray of light strikes an interface between two media, is known as:
Responda
  • Faraday’s law
  • Snell’s law
  • Ampere’s law
  • Cole’s law
  • None of these

Questão 32

Questão
As used in the laws of reflection and refraction, the “normal” direction is:
Responda
  • Any convenient direction
  • Tangent to the interface
  • Along the incident ray
  • Perpendicular to the electric field vector of the light
  • Perpendicular to the interface

Questão 33

Questão
When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:
Responda
  • The material of the reflecting surface
  • The angle of incidence
  • The index of the medium
  • The intensity of the wave
  • The wavelength

Questão 34

Questão
The index of refraction of a substance is:
Responda
  • The speed of light in the substance
  • The angle of refraction
  • The angle of incidence
  • The speed of light in vacuum divided by the speed of light in the substance
  • Measured in radians

Questão 35

Questão
The units of index of refraction are:
Responda
  • m/s
  • s/m
  • radian
  • m/s^2
  • None of these

Questão 36

Questão
A virtual image is one:
Responda
  • Toward which light rays converge but do not pass through
  • From which light rays diverge but do not pass through
  • From which light rays diverge as they pass through
  • Toward which light rays converge and pass through
  • With a ray normal to a mirror passing through it

Questão 37

Questão
When you stand in front of a plane mirror, your image is:
Responda
  • Real, erect, and smaller than you
  • Real, erect, and the same size as you
  • Virtual, erect, and smaller than you
  • Virtual, erect, and the same size as you
  • Real, inverted, and the same size as you

Questão 38

Questão
As an object is moved from the center of curvature of a concave mirror toward its focal point its image:
Responda
  • Remains virtual and becomes larger
  • Remains virtual and becomes smaller
  • Remains real and becomes larger
  • Remains real and becomes smaller
  • Remains real and approaches the same size as the object

Questão 39

Questão
The image of an erect candle, formed using a convex mirror, is always:
Responda
  • Virtual, inverted, and smaller than the candle
  • Virtual, inverted, and larger than the candle
  • Virtual, erect, and larger than the candle
  • Virtual, erect, and smaller than the candle
  • Real, erect, and smaller than the candle

Questão 40

Questão
At what distance in front of a concave mirror must an object be placed so that the image and object are the same size:
Responda
  • A focal length
  • Half a focal length
  • Twice a focal length
  • Less than half focal length
  • More than twice a focal length

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