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78 Cards in this Set
- Front
- Back
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Probably the most information about our environment comes to us through the sense of:
A. Hearing B. Taste C. Touch D. Sight E. Smell |
D. Sight
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Our senses may obtain less than accurate information concerning our physical world because they:
A. have limited sensitivity B. can be deceived C. have limited range D. all of these |
D. all of these
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A hypothesis is based on:
A. a theory B. the scientific method c. a concept law d. a physical law |
C. a concept
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the "scientific method" as discussed in the text could best be described as a
a. science that describes observations and predicts what will be observed under certain well-defined conditions. b. scientific approach to controlling nature. c. method of teaching science d. procedure used in acquiring knowledge and testing theories |
d. brochure used in acquiring knowledge and testing theories
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A scientific law is based on
a. a radical view b. a well-tested theory with consistent results c. unobserved phenomena d. a consensus of scientists |
b. a well-tested theory with consistent results
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A meaningful idea that can be sued to describe phenomena is known as a
a. theory b. concept c. hypothesis d. law |
b. concept
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Which of the rolling is NOT a fundamental quantity?
a. meter b. time c. mass d. Electric Charge |
a. meter
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As a student, which fundamental quantity do you measure most often every day?
a. length b. mass c. time d. electric charge |
c. time
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The word that best describes the continuous forward flow of events is
a. space b. length c. time d. motion |
c. time
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Which of the following is NOT a unit of measurement for a fundamental quantity?
a. length b. kilogram c. second d. coulomb |
a. length
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The standard unit of length, the meter, is now defined with reference to
a. a meridian of earth b. a platinum-iridium bar c. the speed of light d. the French metre |
c. the speed of light
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The meter was originally defined as
a. the wavelength of a line in the spectrum of krypton-66 b. one ten-millionth of the diameter of earth c. the length of a platinum-iridium bar d. one ten-millionth of one-half of a meridian |
d. one ten-millionth of one-half of a meridian
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A unit in which mass may be measured is the
a. pound b. grain c. coulomb d. gram |
d. gram
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In the metric MKS system of units, m is the symbol for
a. mass b. meter c. metric d. none of these |
b. meter
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Which of the following is a unit of mass density?
a. g/cm2 b. lb/ft3 c. km/m3 d. slug/ft2 |
c. kg/m3
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One kilogram is the same as
a. 0.001 g b. 1/1000 kg c. 1000 g d. 10,000 g |
c. 1000 g
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Which of the following is a derived quantity?
a. mass b. length c. slug d. area |
d. area
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Which of the following is NOT a derived quantity?
a. volume b. mass c. density d. speed |
b. mass
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A measurement
a. is always exact b. usually has units c. is a comparison of physical quantity with a standard unit d. is always made with an instrument |
c. is a comparison of physical quantity with a standard unit
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How measurements are expressed depends on
a. the precision of the measuring instrument b. our senses c. the choice of standard units d. the choice of fundamental quantities |
c. the choice of standard units
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One microgram contains how many grams?
a. 10 3 b. 10 6 c. 10 9 d. 10 12 |
b. 10 6
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One megawatt contains how many watts?
a. 10 3 b. 10 6 b. 10 6 d. 10 9 |
b. 10 6
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The speed of light in vacuum is 300,000,000 m/s. Represented in the powers-of-10 notation, this is
a. 3 x 10 8 m/s b. 30 x 10 7 m/s c. 300 x 10 6 m/s d. all of these |
d. all of these
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A measurement of .00254 gram is the same as
a. 25.4 mg b. 2.54 mg c. .254 mg d. 254 |
b 2.54mg
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Motion necessarily involves
a. a change in position b. a change in speed c. a change in velocity d. all of these |
a. a change in position
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Distance covered per unit of time is called
a. acceleration b. velocity c. inertia d. speed |
d. speed
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A possible unit of speed is
a. m/s2 b. m x s2 c. m/s d. m2/s |
c. m/s
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Velocity is expressed in units of
a. length divided by time b. length times time c. length divided by time squared d. none of these |
a. length divided by time
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A speedometer indicates ____________________ if the automobile is traveling forward.
a. instantaneous velocity b. average speed c. instantaneous speed d. instantaneous acceleration |
c. instantaneous speed
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If an object moves with constant velocity,
a. its speed is constant b. its average speed is constant c. its direction is constant d. all of these are true |
d. all of these are true
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When an object accelerates, there is necessarily a change in
a. speed b. direction c. velocity d. all of these |
d. all of these
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30 m/s is a measure of
a. velocity b. speed c. distance d. acceleration |
b. speed
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The distance traveled by an automobile moving at a constant velocity is
a. directly proportional to the time b. directly proportional to the time squared c. inversely proportional to the time d. none of these |
a. directly proportional to the time
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An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) _______________ velocity
a. increasing b. changing c. decreasing d. constant |
c. decreasing
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A possible unit of acceleration is
a. m/s 2 b. (mi/h) x (s) c. ft2/s d. ft/s |
a. m/s2
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If the velocity of a body increases, we may be sure that, during the time of this increase
a. the body is accelerated b. the body is moving in a straight path c. the acceleration of the body increases d. none of these are true |
a. the body is accelerated
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A freely falling object
a. is unaffected by gravity b. has an acceleration that depends on its mass c. has a uniformly increasing displacement d. has a uniformly increasing velocity |
d. has a uniformly increasing velocity
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Free-fall experiments
a. may be performed on the moon b. can only be approximated on earth c. show no mass dependence d. all of these |
d. all of these
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An object with a mass of 2.0 kg is dropped. It takes 3.0 s to hit the ground. Then an object with a mass of 4.0 kg is dropped from the same point. How long does it take to hit the ground?
a. 3.0s b. 6.0s c. 9.0s d. 1.5s |
a. 3.0s
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A car is moving down a freeway in a straight line at a constant rate of 25 m/s. It's acceleration is
a. 25m/s b. zero c. 9.8m/s2 d. 9.8m/s |
b. zero
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A freely falling body has a constant acceleration of 9.8 m/s2. This means that.
a. the body travels 9.8m each second b. the body's displacement changes by 9.8 m every second squared c. the body's acceleration increases by 9.8 m/s2 each second d. the body's speed increases by 9.8m/s each second. |
d. the body's speed increases by 9.8 m/s every second
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A body that is moving with an acceleration different from zero will always have a(n) ___________ velocity
a. increasing b. changing c. constant d. decreasing |
b. changing
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A lead ball weighs approximately four times as much as an aluminum ball of the same volume, yet both undergo practically the same acceleration when dropped from a tower because
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the acceleration is independent from the mass
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Which of the following statements is NOT true?
a. speed has a magnitude only b. velocity has a magnitude and a direction c. displacement has a direction and a magnitude d. acceleration has a magnitude only |
d. acceleration has a magnitude only
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All of the following may be represented by vectors except:
a. velocity b. speed c. acceleration d. displacement |
b. speed
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Which of the following statements is NOT true?
a. Vector quantities have magnitude and direction b. scalar quantities have magnitude only c. scalar quantities have direction only d. speed is a scalar quantity |
c. scalar quantities have direction only
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A body travels in a circle of radius 3.0m with a constant speed of 4.0 m/s. What is the direction of its acceleration?
a. tangential to the circle b. toward the center of the circle c. normal to the plane of the circle d. insufficient data given for determination |
b. toward the center of the circle
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A projectile's vertical velocity component
a. changes most rapidly near the top of its trajectory b. changes most rapidly near the bottom of its trajectory c. changes uniformly d. does not change |
c. changes uniformly
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A projectile's horizontal velocity component
a. changes most rapidly near the top of its trajectory b. changes most rapidly near the bottom of its trajectory c. changes uniformly d. does not change |
d. does not change
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If we neglect the effect of the air upon an object projected at a 45 degree angle, we find that its subsequent motion consists of a uniform downward acceleration combined with
a. an equal horizontal acceleration b. an equal acceleration upward c. a constant horizontal velocity d. an acceleration always perpendicular to its path e. a constantly increasing velocity |
c. a constant horizontal velocity
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An object moving in a circle at a constant speed is acceleration because
a. the magnitude of the velocity is changing b. the direction of the velocity is changing c. the direction of the speed is changing d. the magnitude and the direction of the velocity are both changing |
b. the direction of the velocity is changing
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A mass is accelerated when _________ acts upon the mass
a. any force b. a balanced force c. an unbalanced force d. none of these |
c. an unbalanced force (net force)
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Newton's first law refers specifically to
a. masses at rest b. masses in motion c. masses at rest or in motion d. none of these |
c. masses at rest OR (with a constant velocity) in motion
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A net force always produces
a. a constant velocity b. acceleration c. equilibrium d. circular motion |
b. acceleration
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A constant net force acting on an object that is free to move will produce a constant
a. velocity b. speed c. displacement d. acceleration |
d. acceleration
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The acceleration produced by an (net?) unbalanced force acting on an object is
a. directly proportional to the magnitude of the force b. in the direction of the force c. inversely proportional to the mass of the object d. all of these |
d. all of these
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The SI base units making up a newton are
a. kg-m/s b. kg/s2 c. kg-m/s2 d. kg2-m/s |
c. kg-m/s2
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Another way of describing the acceleration of an object by Newton's second law is
a. force per unit mass b. as inertia c. the time rate of change of displacement d. an angular momentum |
a. force per unit mass
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A quantity having the capability of producing motion is called
a. a scalar b. a force c. a slug d. inertia |
b. a force
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A unit that is not a unit of weight is the
a. pound b. kilogram c. newton d. dyne |
b. kilogram
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If a person weighs 120 lb on earth, her weight on the moon would be
a. 120 lb b. 720 lb c. 60 lb d. 20 lb |
d. 20 lb (1/6th of weight)
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Which of the following would be different for a person on the moon rather than on earth?
a. inertia b. mass c. height d. weight |
d. weight
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The relationship between mass and weight is given by the equation
a. m=wg b. g=mw c. w=m/g d. w=mg |
d. w=mg
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Newton's law of universal gravitation is believed to be applicable
a. on earth only b. on earth and the moon only c. to the solar system only d. throughout the universe e. to the milky way only |
d. throughout the universe
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The constant G that appears in the equation E = Gm1m2/r2 is
a. the acceleration due to gravity b. a universal constant c. smaller on the moon than on earth d. equal to g e. the force of gravity |
b. a universal constant
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The attraction between an object on or near earths surface and earth is called
a. weight b. inertia c. mass d. gravity |
a. weight
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"For every action there is an equal and opposite reaction" is a statement of Newton's
a. First law b. Second Law c. Third Law d. Law of universal gravitation |
c. third law
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To cause an object to go around in a circle, a(n) ________ force must be provided
a. unbalanced b. inertial c. centripetal d. gravitational |
c. centripetal
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The linear momentum of a mass can be determined bt taking the product of the mass and the
a. time that the mass moves b. distance that the mass moves c. acceleration of the mass d. velocity of the mass |
d. velocity of the mass
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Momentum
a. is a scalar quantity b. is the units of mass times acceleration c. has magnitude and direction d. none of these |
c. has magnitude and direction
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The total linear momentum of an isolated system of masses remains the same if there are no external _________ acting on the system
a. forces b. unbalanced forces c. torques d. unbalanced torques |
b. unbalanced forces
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The sped of a comet in its orbit around the sun is ________ when its distance from the sun is greatest
a. greatest b. least c. reversed d. zero |
b. least
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A group of hypothesis that attempt to explain a phenomenon is a(n) ______________
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Theory
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The scientific method holds that no theory is valid unless its predictions are in accord with _____________
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Experiment
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A(n) ___________ is a meaningful idea that can be used to describe phenomena
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Concept
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An accurate description of what is observed in our environment is known as a(n) ___________
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Fact
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A(n) ___________ is a description of a certain behavior of nature that extends beyond what has been observed
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Theory
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Any quantity that is capable of producing motion or a change in motion is called a(n) _____________
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Force
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