Test Bank For University Physics, 13th Edition

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1University Physics, 13e(Young/Freedman)Chapter 1Units, Physical Quantities, and Vectors1.1Conceptual Questions1) The current definition of the standard meter of length is based onA) the distance between the earth's equator and north pole.B) the distance between the earth and the sun.C) the distance traveled by light in a vacuum.D) the length of a particular object kept in France.Answer: CVar: 12) The current definition of the standard second of time is based onA) the frequency of radiation emitted by cesium atoms.B) the earth's rotation rate.C) the duration of one year.D) the oscillation of a particular pendulum kept in France.Answer: AVar: 13) The current definition of the standard kilogram of mass is based onA) the mass of the earth.B) the mass of the sun.C) the mass a particular object kept in France.D) the mass of a cesium-133 atom.Answer: CVar: 14) If a woman weighs 125 lb, her mass expressed in kilograms isxkg, wherexisA) less than 125.B) greater than 125.Answer: AVar: 15) If a tree is 15 m tall, its height expressed in feet isxft, wherexisA) less than 15.B) greater than 15.Answer: BVar: 16) If a flower is 6.5 cm wide, its width expressed in millimeters isxmm, wherexisA) less than 6.5.B) greater than 6.5.Answer: BVar: 1

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27) If an operatic aria lasts for 5.75 min, its length expressed in seconds isxs, wherexisA) less than 5.75.B) greater than 5.75.Answer: BVar: 18) Scientists use the metric system chiefly because it is more accurate than the English system.A) TrueB) FalseAnswer: BVar: 19) When adding two numbers, the number of significant figures in the sum is equal to thenumber of significant figures in the least accurate of the numbers being added.A) TrueB) FalseAnswer: BVar: 110) When determining the number of significant figures in a number, zeroes to the left of thedecimal point are never counted.A) TrueB) FalseAnswer: BVar: 111) Which of the following is an accurate statement?A) The magnitude of a vector can be zero even though one of its components is not zero.B) It is possible to add a scalar quantity to a vector.C) Even though two vectors have unequal magnitudes, it is possible that their vector sum is zero.D) Rotating a vector about an axis passing through the tip of the vector does not change thevector.E) The magnitude of a vector is independent of the coordinate system used.Answer: EVar: 112) If-= 0, then the vectorsandhave equal magnitudes and are directed in theopposite directions from each other.A) TrueB) FalseAnswer: BVar: 1

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313) Under what condition is |-|=A + B?A) The magnitude of vectoris zero.B) Vectorsandare in opposite directions.C) Vectorsandare in the same direction.D) Vectorsandare in perpendicular directions.E) The statement is never true.Answer: BVar: 114) IfA > B, under what condition is |-|=A-B?A) The statement is never true.B) Vectorsandare in opposite directions.C) Vectorsandare in the same direction.D) Vectorsandare in perpendicular directions.E) The statement is always true.Answer: CVar: 115) For the vectors shown in the figure, express vectorin terms of vectorsand.Answer:=-Var: 116) The magnitude of a vector can never be less than the magnitude of one of its components.A) TrueB) FalseAnswer: AVar: 117) If the magnitude of vectoris less than the magnitude of vector, then thexcomponentofis less than thexcomponent of.A) TrueB) FalseAnswer: BVar: 1

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418) If the eastward component of vectoris equal to the westward component of vectorandtheir northward components are equal. Which one of the following statements about these twovectors is correct?A) Vectoris parallel to vector.B) Vectorsandpoint in opposite directions.C) Vectoris perpendicular to vector.D) The magnitude of vectoris equal to the magnitude of vector.E) The magnitude of vectoris twice the magnitude of vector.Answer: DVar: 119) If all the components of a vector are equal to 1, then that vector is a unit vector.A) TrueB) FalseAnswer: BVar: 120) If the dot product of two nonzero vectors is zero, the vectors must be perpendicular to eachother.A) TrueB) FalseAnswer: AVar: 121) If two nonzero vectors point in the same direction, their dot product must be zero.A) TrueB) FalseAnswer: BVar: 122) The value of the dot product of two vectors depends on the particular coordinate systembeing used.A) TrueB) FalseAnswer: BVar: 123) If two vectors are perpendicular to each other, their cross product must be zero.A) TrueB) FalseAnswer: BVar: 1

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524) If two vectors point in opposite directions, their cross product must be zero.A) TrueB) FalseAnswer: AVar: 125) Ifandare nonzero vectors for which∙=0, it must follow thatA)×= 0.B)is parallel to.C) |×|=AB.D) |×|= 1.Answer: CVar: 11.2Problems1) Convert 1.2 × 10-3to decimal notation.A) 1.200B) 0.1200C) 0.0120D) 0.0012E) 0.00012Answer: DVar: 52) Write out the number 7.35 × 10-5in full with a decimal point and correct number of zeros.A) 0.00000735B) 0.0000735C) 0.000735D) 0.00735E) 0.0735Answer: BVar: 53) 0.0001776 can also be expressed asA) 1.776 × 10-3.B) 1.776 × 10-4.C) 17.72 × 104.D) 1772 ×105.E) 177.2 × 107.Answer: BVar: 5

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64) 0.00325 × 10-8cm can also be expressed in mm asA) 3.25 × 10-12mm.B) 3.25 × 10-11mm.C) 3.25 × 10-10mm.D) 3.25 × 10-9mm.E) 3.25 × 10-8mm.Answer: CVar: 15) If, in a parallel universe, π has the value 3.14149, express π in that universe to four significantfigures.A) 3.141B) 3.142C) 3.1415D) 3.1414Answer: AVar: 16) The number 0.003010 hasA) 7 significant figures.B) 6 significant figures.C) 4 significant figures.D) 2 significant figures.Answer: CVar: 17) What is74.0674.0to the proper number of significant figures?A) 0.91B) 0.911C) 0.9108D) 0.9Answer: AVar: 50+8) What is the value of π(8.104)2, written with the correct number of significant figures?A) 206.324B) 206.323C) 206.3D) 206E) 200Answer: CVar: 1

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79) What is the sum of 1123 and 10.3 written with the correct number of significant figures?A) 1.13 × 103B) 1133.3000C) 1.1 × 103D) 1133.3E) 1133Answer: EVar: 110) What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures?A) 8B) 7.6C) 7.62D) 7.616E) 7.6160Answer: BVar: 311) What is the difference between 103.5 and 102.24 written with the correct number ofsignificant figures?A) 1B) 1.3C) 1.26D) 1.260E) 1.2600Answer: BVar: 312) What is the product of 11.24 and 1.95 written with the correct number of significant figures?A) 22B) 21.9C) 21.92D) 21.918E) 21.9180Answer: BVar: 313) What is the result of 1.58 ÷ 3.793 written with the correct number of significant figures?A) 4.1656 ×10-1B) 4.166 ×10-1C) 4.17 ×10-1D) 4.2 ×10-1E) 4 ×10-1Answer: CVar: 3

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814) What is 34 + (3) × (1.2465) written with the correct number of significant figures?A) 37.7B) 37.74C) 4 × 101D) 38E) 37.7395Answer: DVar: 515) What is 56 + (32.00)/(1.2465 + 3.45) written with the correct number of significant figures?A) 62.8B) 62.812C) 62.81D) 63E) 62.8123846Answer: DVar: 116) Add3685 gand66.8 kgand express your answer in milligrams (mg).A) 7.05×107mgB) 7.05×104mgC) 7.05×105mgD) 7.05×106mgAnswer: AVar: 50+17) Express (4.3×106)-1/2in scientific notation.A) 4.8×10-4B) 2.1×103C) 2.1×10-5D) 2.1×104Answer: AVar: 4018) What is 0.2052/3, expressed to the proper number of significant figures?A) 0.348B) 0.35C) 0.3D) 0.3477Answer: AVar: 50+

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919) The length and width of a rectangle are 1.125 m and 0.606 m, respectively.Multiplying, yourcalculatorgives the product as 0.68175.Rounding properly to the correct number of significantfigures, the area should be written asA) 0.7 m2.B) 0.68 m2.C) 0.682 m2.D) 0.6818 m2.E) 0.68175 m2.Answer: CVar: 120) The following exact conversion equivalents are given: 1 m = 100 cm, 1 in = 2.54 cm, and1 ft+ 12 in.If a computer screen has an area of 1.27ft2, this area is closest toA) 0.00284m2.B) 0.0465m2.C) 0.118m2.D) 0.284m2.E) 4.65m2.Answer: CVar: 121) In addition to 1 m = 39.37 in., the following exact conversion equivalents are given:1 mile =5280 ft, 1 ft = 12 in, 1 hour = 60 min, and 1 min = 60 s.If a particle has a velocity of 8.4 milesper hour,its velocity, in m/s, is closest toA) 3.8 m/s.B) 3.0 m/s.C) 3.4 m/s.D) 4.1 m/s.E) 4.5 m/s.Answer: AVar: 50+22) A weight lifter can bench press171 kg.How many milligrams(mg) is this?A) 1.71×108mgB) 1.71×109mgC) 1.71×107mgD) 1.71×106mgAnswer: AVar: 50+

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1023) How many nanoseconds does it take for a computer to perform one calculation if it performs6.7×107calculations per second?A) 15 nsB) 67 nsC) 11 nsD) 65 nsAnswer: AVar: 50+24) The shortest wavelength of visiblelight is approximately 400 nm.Express this wavelength incentimeters.A) 4×10-5cmB) 4×10-7cmC) 4×10-9cmD) 4×10-11cmE) 400×10-11cmAnswer: AVar: 125) The wavelength of a certain laser is0.35 micrometers,where1 micrometer =1×10-6m.Express this wavelength in nanometers.A) 3.5×102nmB) 3.5×103nmC) 3.5×101nmD) 3.5×104nmAnswer: AVar: 50+26) A certain CD-ROM disk can store approximately 6.0 × 102megabytes of information, where106bytes = 1 megabyte. If an average word requires 9.0 bytes of storage, how many words canbe stored on one disk?A) 6.7×107wordsB) 5.4×109wordsC) 2.1×107wordsD) 2.0×109wordsAnswer: AVar: 9

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1127) A plot of land contains5.8 acres.How many square meters does it contain?[1 acre = 43,560 ft2]A) 2.3×104m2B) 7.1×103m2C) 7.0×104m2D) 5.0×104m2Answer: AVar: 50+28) A person on a diet loses1.6 kgin a week. How manymicrograms/second (μg/s)are lost?A) 2.6×103μg/sB) 1.6×105μg/sC) 44μg/sD) 6.4×104μg/sAnswer: AVar: 1129) Albert uses as his unit of length (for walking to visit his neighbors or plowing his fields) thealbert (A), the distanceAlbert can throw a small rock.One albert is92 meters.How many squarealberts is equal to one acre? (1 acre = 43,560 ft2= 4050 m2)Answer: 1.29 A2Var: 50+30) Convert a speed of 4.50 km/h to units of ft/min. (1.00 m = 3.28 ft)A) 0.246 ft/minB) 82.3 ft/minC) 165 ft/minD) 246 ft/minE) 886 ft/minAnswer: DVar: 131) The exhaust fan on a typical kitchen stove pulls 600 CFM (cubic feet per minute) through thefilter. Given that 1.00 in. = 2.54 cm, how many cubic meters per second does this fan pull?A) 0.283 m3/secB) 0.328 m3/secC) 3.05 m3/secD) 32.8 m3/secAnswer: AVar: 1

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1232) The mass of a typical adult woman is closest toA) 20 kg.B) 35 kg.C) 75 kg.D) 150 kg.Answer: CVar: 133) The height of the ceiling in a typical home, apartment, or dorm room is closest toA) 100 cm.B) 200 cm.C) 400 cm.D) 500 cm.Answer: BVar: 134) Approximately how many times does an average human heart beat in a year?A) 4 ×105B) 4 ×106C) 4 ×107D) 4 ×108E) 4 ×109Answer: CVar: 135) Approximately how many times does an average human heart beat in a lifetime?A) 3 ×1011B) 3 ×1010C) 3 ×109D) 3 ×108E) 3 ×107Answer: CVar: 136) Approximately how many pennies would you have to stack to reach an average 8-footceiling?A) 2 ×102B) 2 ×103C) 2 ×104D) 2 ×105E) 2 x106Answer: BVar: 1

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1337) Estimate the number of times the earth will rotate on its axis during a human's lifetime.A) 3 ×104B) 3 ×105C) 3 ×106D) 3 ×107E) 3 x108Answer: AVar: 138) Estimate the number of pennies that would fit in a box one foot long by one foot wide by onefoot tall.A) 5 ×102B) 5 ×103C) 5 ×104D) 5 ×105E) 5 x106Answer: CVar: 139) A marathon is26 miand385 ydlong. Estimate how many strides would be required to run amarathon. Assume a reasonable value for the average number offeet/stride.A) 4.5×104stridesB) 4.5×103stridesC) 4.5×105stridesD) 4.5×106stridesAnswer: AVar: 140) The period of a pendulum is the time it takes the pendulum to swing back and forth once. Ifthe only dimensional quantities that the period depends on are the acceleration of gravity,g, andthe length of the pendulum,ℓ, what combination ofgandℓmust the period be proportional to?(Acceleration has SI units of m ∙ s-2.).A)g/ℓB)gℓ2C)gℓD)gE)g/Answer: EVar: 1

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1441) The speed of a wave pulse on a string depends on the tension,F, in the string and the massper unit length,μ, of the string. Tension has SI units ofkg · m ·s-2andthe mass per unit lengthhas SIunits ofkg · m-1.What combination ofFandμmust the speed of the wave beproportional to?A) F /μB)μ/ FC)F/D)FE)/FAnswer: AVar: 142) The positionx, in meters, of an object is given by the equationx=A+Bt+Ct2, wheretrepresents time in seconds.What are the SI units ofA,B, andC?A) m, m, mB) m, s, sC) m, s, s2D) m, m/s, m/s2E) m/s, m/s2, m/s3Answer: AVar: 143) You walk55mto the north, then turn 60° to your right and walk another45 m.How far areyou from where you originally started?A) 87 mB) 50 mC) 94 mD) 46 mAnswer: AVar: 31

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1544) Vectorsandare shown in the figure. Vectoris given by=-. Themagnitude of vectoris 16.0 units, and the magnitude of vectoris 7.00 units. What is themagnitude of vector?A) 9.00B) 9.53C) 15.5D) 16.2E) 17.5Answer: DVar: 1

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