Physics Unit1: Introduction Measurement & Estimating - 无忧得胜-网上国际课程 (5edu.win)

1#

第 1 题组 (共 70 题 70 分)

Four students measure the mass of an object, ea;m 8q/uu,f ee+ok6 aiu/6hxmpch using a different scale. They record their results as a+;i6muofqeemh8u up//6k,x follows:
Which student used the least precise scale?

Student	Mass (g)
A	49.06
B	49
C	50
D	49.2

A. B. C. D.

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2#

单选题 ( 1.0 分) (组内2/70) 切至整卷模式搜藏此题

Four students measure the mass of an objectgf1p:bo 8pnk+ , each using a different scale. They record their results as np k:f og8p+b1follows:
Which student used the most precise scale?

Student	Mass (g)
A	49.06
B	49
C	50
D	49.2

A. B. C. D.

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3#

单选题 ( 1.0 分) (组内3/70) 切至整卷模式搜藏此题

A useful method of e2 pinlemh4z 7n8-h8 rcxpressing very small or very large numbers is

A. scientific notation.

B. arabic numerals.

C. the metric system.

D. roman numerals.

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4#

单选题 ( 1.0 分) (组内4/70) 切至整卷模式搜藏此题

All of the following are base units of the SI system z8yd-g/hz d (texcept:

A. kilogram.

B. kelvin.

C. meter.

D. volt.

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5#

单选题 ( 1.0 分) (组内5/70) 切至整卷模式搜藏此题

Select the list which contains only SIie rj7j44oph ;6 .qtnd basic units.

A. liter, meter, second, watt

B. joule, kelvin, kilogram, watt

C. candela, kelvin, meter, second

D. joule, newton, second, watt

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6#

单选题 ( 1.0 分) (组内6/70) 切至整卷模式搜藏此题

How many basic units does the SI syst m806dc x.)az4qim grvq0b*krem have?

A. four

B. five

C. seven

D. ten

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7#

单选题 ( 1.0 分) (组内7/70) 切至整卷模式搜藏此题

The base SI unit of ty7 yt* 6jvkit kqf+(8uime is

A. hour

B. minute

C. second

D. millisecond

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8#

单选题 ( 1.0 分) (组内8/70) 切至整卷模式搜藏此题

In the CGS system, what are the fundamsuvazi3 1;1rph5y-o l a;;(v8 yrc 2f shn3qkfental units?

A. Newton, centimeter, second

B. kilogram, meter, second

C. gram, centimeter, minute

D. gram, centimeter, second

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9#

单选题 ( 1.0 分) (组内9/70) 切至整卷模式搜藏此题

The metric prefix for one one-9c1sk 4rwgbo5hh4 hf,thousandth is

A. milli

B. centi

C. kilo

D. mega

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10#

单选题 ( 1.0 分) (组内10/70) 切至整卷模式搜藏此题

The metric prefix for one one-hundre7 b v*tu35fumg*qpm0e ylxa0-vwnh6- dth is

A. milli

B. centi

C. kilo

D. mega

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11#

单选题 ( 1.0 分) (组内11/70) 切至整卷模式搜藏此题

The metric prefix for-- zyyg 3)b m42knf(plmtthyi j88 b7x one thousand is

A. milli

B. centi

C. kilo

D. mega

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12#

单选题 ( 1.0 分) (组内12/70) 切至整卷模式搜藏此题

Express the number 0.02 days using a pres,ytz r5i/9tx,temj : fix.

A. 2 decidays

B. 2 centidays

C. 2 millidays

D. 2 microdays

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13#

单选题 ( 1.0 分) (组内13/70) 切至整卷模式搜藏此题

What is the conversion factor 3t.+byiv :( mm hevn*cbetween $km/h$ and $m/s$?

A. $0.0278 \; m/s$

B. $0.278 \; m/s$

C. $3.60 \; m/s$

D. $16.7 \; m/s$

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14#

单选题 ( 1.0 分) (组内14/70) 切至整卷模式搜藏此题

What is the conversion fads d:to:iyg15zt / xw3ctor between $km/h^2$ and $m/s^2$?

A. $7.72 \times 10^{-5} \; m/s^{2}$

B. $2.78 \times 10^{-1} \; m/s^{2}$

C. $1.30 \times 10^{4} \; m/s^{2}$

D. $3.60 \; m/s^2$

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15#

单选题 ( 1.0 分) (组内15/70) 切至整卷模式搜藏此题

What is the conversion factor bet8y vxrubdu:q , 6uk69uween $cm^{2}$ and $m^{2}$?

A. $0.01 \; m^{2}/cm^{2}$

B. $0.0001 \; m^{2}/cm^{2}$

C. $100 \; m^{2}/cm^{2}$

D. $10000 \; m^{2}/cm^{2}$

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16#

单选题 ( 1.0 分) (组内16/70) 切至整卷模式搜藏此题

The position, x, of an object is given by the equatiphf 9-lnnkf:;q. , fz)ptuyt)on $x = A + Bt +Ct^2$, where $t$ refers to time. What are the dimensions of A, B, and C?

A. $distance, distance, distance$

B. $distance, time, time^2$

C. $distance, distance/time, distance/time^2$

D. $distance/time, distance/time^2, distance/time^3$

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17#

单选题 ( 1.0 分) (组内17/70) 切至整卷模式搜藏此题

What is the percent u tnwuve6 r+(rthio7t r/gt,20ncertainty in the measurement $2.58 \pm 0.15 cm$?

A. 2.9%

B. 5.8%

C. 8.7%

D. 12%

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18#

单选题 ( 1.0 分) (组内18/70) 切至整卷模式搜藏此题

What, approximately, is the percent uncertainty forj 0kyt *b)vk6w, vtr1p sj3un4 the measurement 5.2 mA?

A. 1%

B. 2%

C. 3%

D. 4%

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19#

单选题 ( 1.0 分) (组内19/70) 切至整卷模式搜藏此题

What is the percent uncertainty in the area of a circle 0hes 5 1,l s.zfyrp;cowhose radius is $1.8 \times 10^{4} \; cm$?

A. 1.1%

B. 5.6%

C. 11%

D. 56%

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20#

单选题 ( 1.0 分) (组内20/70) 切至整卷模式搜藏此题

What is the volume, and its approximate uncertainty, of azkw* at o. p 4fyfgb-/-)j4g93yidcuz sphere of radius $1.96 \pm 0.01 \; m$?

A. $31.5 \pm 0.2 \; m^{2}$

B. $31.5 \pm 0.3 \; m^{2}$

C. $31.5 \pm 0.4 \; m^{2}$

D. $31.5 \pm 0.5 \; m^{2}$

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21#

单选题 ( 1.0 分) (组内21/70) 切至整卷模式搜藏此题

The number of significant figures in 100 c6 :zjk(ehsy *y6.o gpewl+f901 is

A. two

B. three

C. five

D. six

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22#

单选题 ( 1.0 分) (组内22/70) 切至整卷模式搜藏此题

The number of significant figures in 0.: kc ))dgdyvo):d3ce j01500 is

A. two

B. three

C. four

D. five

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23#

单选题 ( 1.0 分) (组内23/70) 切至整卷模式搜藏此题

The number of significant figures iqn,, bfq-/pqlq 2 )9dxqr7ccqn 0.040 is

A. one

B. two

C. three

D. four

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24#

单选题 ( 1.0 分) (组内24/70) 切至整卷模式搜藏此题

Which of the following has three signific*.jvoa4d ptn1ant figures?

A. $305.0 \; cm$

B. $0.0500 \; mm$

C. $1.00081 \; kg$

D. $8.060 \times 10^{11} \; m^{2}$

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25#

单选题 ( 1.0 分) (组内25/70) 切至整卷模式搜藏此题

What is the sum of $2.67 \; cm + 1.976 \; cm + 2.1 \; cm$ considering significant figures?

A. $6.7 \; cm$

B. $6.75 \; cm$

C. $6.746 \; cm$

D. $6.7460 \; cm$

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26#

单选题 ( 1.0 分) (组内26/70) 切至整卷模式搜藏此题

What is the difference 103.5 Volts and 102.24d6su-5eq npd0 Volts if they respectively represe-5 sp eqd0u6dnnt two measurment values of Voltage?

A. 1.3 Volts

B. 1.26 Volts

C. 1.260 Volts

D. 1.2600 Volts

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27#

单选题 ( 1.0 分) (组内27/70) 切至整卷模式搜藏此题

What is the area of a rectangle with dim v*pq50mw qgzp1 t3,teyekmwsb8z 6+12nv;yhension $12.56 \; cm$ and $2.12 \; cm$?

A. $27 \; cm^2$

B. $26.6 \; cm^2$

C. $26.23 \; cm^2$

D. $26.627 \; cm^2$

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28#

单选题 ( 1.0 分) (组内28/70) 切至整卷模式搜藏此题

What is the result of 2.43 divided by 4.561 considering significanta(t-+3 cilp 3t - rvjd5n)v,l1t7bcezm8u z bp figures?

A. $5.3278 \times 10^{-1}$

B. $5.328 \times 10^{-1}$

C. $5.33 \times 10^{-1}$

D. $5.3 \times 10^{-1}$

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29#

单选题 ( 1.0 分) (组内29/70) 切至整卷模式搜藏此题

What is the cosine ofz( 2g1b 3q fb dmucc/y7:9 z7jmucz.ta $55 ^{\circ}$?

A. 0.6

B. 0.57

C. 0.574

D. 0.5736

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30#

单选题 ( 1.0 分) (组内30/70) 切至整卷模式搜藏此题

The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Mfx2 .y4wim nh l)r9(hlultiplying, your calculator gives the product as 0.68175. Rounding properly to the correct nul 2xhr)my 4.( w9nilfhmber of significant figures, the area should be written as

A. $0.68 \; m^{2}$

B. $0.682 \; m^{2}$

C. $0.6818 \; m^{2}$

D. $0.68175 \; m^{2}$

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31#

单选题 ( 1.0 分) (组内31/70) 切至整卷模式搜藏此题

The length and width of a rec ,t xgc8c7rn2xtangle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these and multiplying by two. Your calculator's display reads3.462 To the correct number of significantnr8,t cxxg2c7 figures, this should be written as

A. 3.5 m

B. 3.46 m

C. 3.462 m

D. 3.4620 m

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32#

单选题 ( 1.0 分) (组内32/70) 切至整卷模式搜藏此题

A rectangle is 3.25 m long anddp bf+etg/.2g 1.5 m wide. What is its area?

A. $4.875 \; m^{2}$

B. $4.87 \; m^{2}$

C. $4.80 \; m^{2}$

D. $4.9 \; m^{2}$

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33#

单选题 ( 1.0 分) (组内33/70) 切至整卷模式搜藏此题

A rectangular garden measures 15 m long and 13.7 m wide. What is tzflj 0ico;6*she length of a diagonal from zfo06i ls*c j;one corner of the garden to the other?

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34#

单选题 ( 1.0 分) (组内34/70) 切至整卷模式搜藏此题

Select the smallest re4g(n/it,d tc k z3e/value.

A. $15 \times 10^{-3}$

B. $0.15 \times 10^{0}$

C. $0.00015 \times 10^{3}$

D. $0.00000015 \times 10^{6}$

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35#

单选题 ( 1.0 分) (组内35/70) 切至整卷模式搜藏此题

Write the number 0.00045 in scientific notation (power of ten nogk1 ceq) pcqd3n07,j otation)

A. $4.5 \times 10^{-4}$

B. $4.5 \times 10^{-3}$

C. $4.5 \times 10^{-2}$

D. $4.5 \times 10^{-1}$

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36#

单选题 ( 1.0 分) (组内36/70) 切至整卷模式搜藏此题

0.0001776 can also be exk za1by58km*y8di8pb 8d igi1, a4xt bpressed as

A. $1.776 \times 10^{-4}$

B. $17.72 \times 10^{4}$

C. $1772 \times 10^{5}$

D. $177.2 \times 10^{7}$

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37#

单选题 ( 1.0 分) (组内37/70) 切至整卷模式搜藏此题

4567.89 is properly expressed in scientific nota y71ck5wmxwnn ,)ki+dgd9r.6iivzr( tion as

A. $4.56789 \times 10^{3}$

B. $45.6789 \times 10^{2}$

C. $456.789 \times 10^{1}$

D. $4567.89 \times 10^{0}$

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38#

单选题 ( 1.0 分) (组内38/70) 切至整卷模式搜藏此题

Convert $1.2 \times 10^{-3}$ to its decimal notation.

A. 1.200

B. 0.1200

C. 0.0120

D. 0.0012

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39#

单选题 ( 1.0 分) (组内39/70) 切至整卷模式搜藏此题

Write out the numberrey6t i0 d anje5;*f*t $8.42 \times 10^{-5}$ in full with a decimal point and correct number of zeros.

A. 0.00000842

B. 0.0000842

C. 0.000842

D. 0.00842

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40#

单选题 ( 1.0 分) (组内40/70) 切至整卷模式搜藏此题

What is the result of eh 4 uvoxo2sg a3x4:u1$(0.410 + 0.021) \times (2.20 \times 103)$?

A. 880

B. 946

C. 948

D. 950

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41#

单选题 ( 1.0 分) (组内41/70) 切至整卷模式搜藏此题

Write the number 13.5 gigameters as fy 4,g vk6h+ojcm h5t/qull (decimal) numbers with standard units.

A. 135,000 m

B. 135,000,000 m

C. 135,000,000,000 m

D. 13,500,000,000 m

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42#

单选题 ( 1.0 分) (组内42/70) 切至整卷模式搜藏此题

100 mL is equivalent t;l:dm 3*dxsx;yw;x qlo which of the following?

A. $1 \; kL$

B. $10^{-6} \; mL$

C. $0.1 \; L$

D. $0.01 \; ML$

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43#

单选题 ( 1.0 分) (组内43/70) 切至整卷模式搜藏此题

How many grams is forty milligd1: ioj3h(uh 6 ,g mxhlrkaz/.rams?

A. $0.000040 \; g$

B. $0.00040 \; g$

C. $0.040 \; g$

D. $40000 \; g$

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44#

单选题 ( 1.0 分) (组内44/70) 切至整卷模式搜藏此题

How many meters is sixty kilometers mbs9bs +ns77y8ss9 ow?

A. $600,000 \; m$

B. $60,000 \; m$

C. $60 \; m$

D. $0.06 \; m$

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45#

单选题 ( 1.0 分) (组内45/70) 切至整卷模式搜藏此题

$1 angstrom = 10^{-10} \; m$ and $1 \; fermi = 10^{-15} \; m$, what is the relationship between these units?

A. $1 \; angstrom = 10^5 \; fermi$

B. $1 \; angstrom = 10^{-5} \; fermi$

C. $1 \; angstrom = 10^{-25} \; fermi$

D. $1 \; angstrom = 10^{+25} \; fermi$

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46#

单选题 ( 1.0 分) (组内46/70) 切至整卷模式搜藏此题

$0.00325 \times 10^{-8} \; cm$ can also be expressed in mm as

A. $3.25 \times 10^{-12} \; mm$.

B. $3.25 \times 10^{-11} \; mm$.

C. $3.25 \times 10^{-10} \; mm$.

D. $3.25 \times 10^{-9} \; mm$.

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47#

单选题 ( 1.0 分) (组内47/70) 切至整卷模式搜藏此题

Which one of the follox8 f)gwkdct6 0wing is not equivalent to 2.50 miles? ($1 \; mi = \; 1.609 \; km = 5280 \; ft$, $1 \; ft = 12 \; in$)

A. $1.32 \times 10^{4} \; ft$

B. $1.58 \times 10^{5} \; in$.

C. $4.02 \times 10^{3} \; km$

D. $4.40 \times 10^{3} \; yd$

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48#

单选题 ( 1.0 分) (组内48/70) 切至整卷模式搜藏此题

If you are 5 feet 10 inc-ud s2x+y, t(+ rgd ti7mqwj*bhes tall, what is your height in meters? ($1 \; in = 2.54 \; cm$)

A. $1.5 \; m$

B. $1.6 \; m$

C. $1.7 \; m$

D. $1.8 \; m$

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49#

单选题 ( 1.0 分) (组内49/70) 切至整卷模式搜藏此题

If $1 \; inch = 2.54 \; cm$, and $1 \; yd = 36 \; in$, how many meters are in 7.00 yd?

A. $6.40 \; m$

B. $36.3 \; m$

C. $640 \; m$

D. $1.78 \times 10^{3} \; m$

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50#

单选题 ( 1.0 分) (组内50/70) 切至整卷模式搜藏此题

A hot air balloon rises rj 9vyz x(-3rr(+ytjus0yue 8 to an altitude of 600 fathoms. What is this height, in fexyuztr u+yy- jr8 v3j( r9s0(eet? ($1 \; fathom = 6 \; ft$)

A. $100 \; ft$

B. $600 \; ft$

C. $1200 \; ft$

D. $3600 \; ft$

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51#

单选题 ( 1.0 分) (组内51/70) 切至整卷模式搜藏此题

The average life of an animal is 70 years. Assume one numerical figure, wri24umn2 xtph r/9zny ;3vw/n ekte this in powpmr /n 2vk/ntw3zx4uhn; ye29er of ten in seconds.

A. $3 \times 10^{7} \; s$

B. $2 \times 10^{7} \; s$

C. $2 \times 10^{9} \; s$

D. $3 \times 10^{9} \; s$

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52#

单选题 ( 1.0 分) (组内52/70) 切至整卷模式搜藏此题

The mass of an electron ic y+07uhpd+rs0 jla.pv tbq-o (7br/d s $9.1 \times 10^{-31} \; kg$. How many electrons will make a mass of 1.0 kg?

A. $9.1 \times 10^{30}$

B. $1.1 \times 10^{30}$

C. $9.1 \times 10^{31}$

D. $1.1 \times 10^{31}$

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53#

单选题 ( 1.0 分) (组内53/70) 切至整卷模式搜藏此题

How many m/s is $50 mi/h$ equivalent to? ($1 \; mi = 1609 \; m$)

A. $49 \; m/s$

B. $2.2 \; m/s$

C. $22 \; m/s$

D. $45 \; m/s$

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54#

单选题 ( 1.0 分) (组内54/70) 切至整卷模式搜藏此题

How much longer (percentage).*( 2o+0utvts l;pfuje tb2ze is a 100 m dash than a 100 yd dash? ($1 \; yd = 0.9146 \; m$)

A. 3.5%

B. 6.5%

C. 9.3%

D. 12%

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55#

单选题 ( 1.0 分) (组内55/70) 切至整卷模式搜藏此题

Which is the largest aop(km0pu5 18bf3avyc rea?

A. $2,500,000 \; cm^{2}$

B. $100,000 \; cm^{2}$

C. $7.5 \; m^{2}$

D. $0.75 \; m^{2}$

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56#

单选题 ( 1.0 分) (组内56/70) 切至整卷模式搜藏此题

If $1 \; inch = 2.54 \; cm$, how many square centimeters are in 1.00 square inch?

A. 1.59

B. 2.54

C. 5.08

D. 6.45

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57#

单选题 ( 1.0 分) (组内57/70) 切至整卷模式搜藏此题

Express the following sum with the correct number of signifpusbm p2t29x 7icant figures: $1.00 \; kg + 1531 \; g + 2.54 \times 10^{4} \; mg$.

A. $2.56 \; kg$

B. $27.9 \; kg$

C. $2.53 \; kg$

D. $2.79 \; kg$

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58#

单选题 ( 1.0 分) (组内58/70) 切至整卷模式搜藏此题

A football field is 1p:dg/5zg+tcacr vj m n1 i*sj,lm 3k0x -/.aez20 yd long and 50 yd wide. What is the area of the football fielr+aiz1g.kjtccxa3ms :/ n-d/pj5v l, mg0ez *d, in $m^{2}$, if $1 \; yd = 91.44 \; cm$?

A. $2.4 \times 10^{3} \; m^{2}$

B. $3.7 \times 10^{3} \; m^{2}$

C. $4.2 \times 10^{3} \; m^{2}$

D. $5.0 \times 10^{3} \; m^{2}$

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59#

单选题 ( 1.0 分) (组内59/70) 切至整卷模式搜藏此题

A ball has a radius of 3.23 cm. What is the volume of the balzn *7o n7v+erxfvjwiy ,q 0c83l in $m^{3}$?

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60#

单选题 ( 1.0 分) (组内60/70) 切至整卷模式搜藏此题

A thick-walled metal pipe of length 20.0 cm hs.:uh:emao6q8 ,a jtcas an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surf,eatuaq6c :jhos: 8. mace area of the pipe, counting the ends, in $cm^{2}$?

A. 276

B. 277

C. 278

D. 279

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61#

单选题 ( 1.0 分) (组内61/70) 切至整卷模式搜藏此题

The radius of the Earth is 3963 mi. What is the surface area of the Ear jre 1 ,ix e2h kaj/5c ykbgjjz:j6u-*;1lwi3rth in square xy;/ kjj uj, -2g wb3ehi11l cj*rakz5:6jreimeters?
($1 \; mi = 1609 \; m$)

A. $2 \times 10^{14} \; m^{2}$

B. $2.55 \times 10^{14} \; m^{2}$

C. $2.6 \times 10^{14} \; m^{2}$

D. $5.109 \times 10^{14} \; m^{2}$

E. $5.11 \times 10^{14} \; m^{2}$

F. $5.1 \times 10^{14} \; m^{2}$

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62#

单选题 ( 1.0 分) (组内62/70) 切至整卷模式搜藏此题

The average density of blox4 mhpf35:qd jod is $1.06 \times 10^3 \; kg/m^{3}$. If you donate a pint of blood to the Red Cross, what mass of blood have you donated, in grams? ($1 \; pt = 1/2 \; L$, $1 \; L = 1000 \; cm^{3}$.)

A. $530 \; g$

B. $0.530 \; g$

C. $5300 \; g$

D. $5.30 \times 10^{5} \; g$

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63#

单选题 ( 1.0 分) (组内63/70) 切至整卷模式搜藏此题

The mass of Mars, $6.40 \times 10^{23} \; kg$, is about one-tenth that of the Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density of Mars in $kg/m^{3}$?

A. $9.76 \times 10^{2}$

B. $1.95 \times 10^{3}$

C. $3.90 \times 10^{3}$

D. $7.81 \times 10^{3}$

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64#

单选题 ( 1.0 分) (组内64/70) 切至整卷模式搜藏此题

Concrete is sold by the cubic yard. What is the mass, in ki-kfwg/9v(* 4t tn fa8ui bq*dvlograms, of one cubic yard of concrenu- ( dgv48q*a9t viwfk/*btfte that is five times as dense as water? ($1 \; m = 1.094 \; yd$, and $1 \; m^{3}$ of water has a mass of 1,000 kg.)

A. $764 \; kg$

B. $2.42 \times 10^{3} \; kg$

C. $3.82 \times 10^{3} \; kg$

D. $6.55 \times 10^{3} \; kg$

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65#

单选题 ( 1.0 分) (组内65/70) 切至整卷模式搜藏此题

An average human has a heart rate of 70 beats per minute. If some 6r k q71xuwms+1nz 1-vsif.qv9h8 tloone's heart beats at thaz1 tqurofsk i9x.m7qs-lvw+1816 vhn t average rate over a 70-yr lifetime, how many times would it beat?

A. $7 \times 10^5$

B. $2 \times 10^{6}$

C. $2 \times 10^{7}$

D. $3 \times 10^{9}$

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66#

单选题 ( 1.0 分) (组内66/70) 切至整卷模式搜藏此题

A large school district has 300 school buseso+ wuu-; r2ziv. If each school bus is used 3 hours each day, theiuzuwo;+ 2 vr- average speed of the school buses is 15 mi/h, and the fuel economy of the buses is 10 mi/gal. How much does it cost to run these buses in 22 school days if gasoline costs $1.20 a gallon?

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67#

单选题 ( 1.0 分) (组内67/70) 切至整卷模式搜藏此题

A person stands 35.0 m from a flag pole. With a protractor at eye levelvk1ewor cnx,t 0j( /* 2grkx.h, he finds th /orwk gve2 01kx. nr(*htxc,jat the angle at the top of the flag pole makes with the horizontal is 25.0 degrees. How high is the flag pole? (The distance from his feet to his eyes is 1.7 m.)

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68#

单选题 ( 1.0 分) (组内68/70) 切至整卷模式搜藏此题

Starting from city A, a car drives 250 mebhkqqt*9rmp,h6 x 0:3:u aut iles east to city B, then 300 miles north to city C, and finally 700 miltqbe har3q: 9 0t6:puum ,hxk*es west to city D. What is the distance between city A and city D?

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69#

单选题 ( 1.0 分) (组内69/70) 切至整卷模式搜藏此题

The last page of a book is numbered 764.(each sheet is double-sided) The boeujai gwidx) ob ob ; jpbo+1t h4bw)/*/d9(:ook is 3.00 cm thick. What is the average thickness of a sheet of paper in the book, in cah1 wo( +pjei ow/ b)4bd)iogjob t*u:b/d;9x entimeters?

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70#

单选题 ( 1.0 分) (组内70/70) 切至整卷模式搜藏此题

Wall posters are usu( w/nay*ye sj4ally sold curled up in cylindrical cardboard tubes. If the length of j(n*yae/yw 4 sthe tube is 84.5 cm, and the diameter of the tube is 2.40 cm, what is the area of the poster, in $cm^{2}$? (Assume the poster doesn't overlap itself.)

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71#

填空题 ( 1.0 分) (组内1/6) 切至整卷模式搜藏此题

第 2 题组 (共 6 题 6 分)

How many significant figures do each of thed 96h(y8a e ged wno4ocab377p following numbers have: (a) 214 , (b) 81.60 , (c) 7.03 , (d) 0.03 , (e) 0.0086 , (f) 3236 , and (g) 8700

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72#

填空题 ( 1.0 分) (组内2/6) 切至整卷模式搜藏此题

Add $9.2 \times 10^3s + 8.3 \times 10^4s + 0.008 \times 10^6s$ = $\times 10^5s$

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73#

填空题 ( 1.0 分) (组内3/6) 切至整卷模式搜藏此题

Express the following sum with tv5x zmkcskh/ee 5hqmc(5807g he correct number of significant figures: $1.80 \; m + 142.5 \; cm + 5.34 \times 10^5 \; \mu m$ = $\times 10^2 \; m$

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74#

填空题 ( 1.0 分) (组内4/6) 切至整卷模式搜藏此题

Determine the conversion factot8f4)y- ;pmhd +yaaae r between
(a) $1km/day$ =    $mi/h$ given that $1 \; mile = 1609 \; m$
(b) $1m/s$ =    $ft/min$ given that $1 \; m = 3.28 \; feet$
(c) $1km/h$ =    $m/s$

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75#

填空题 ( 1.0 分) (组内5/6) 切至整卷模式搜藏此题

A light-year is the distance light travels in one year ud, zxq g84j9yl 3(kdz(at speed = $2.998 \times 10^8 \; m$).
(a) How many meters are there in 1.00 light-year? $\times 10^{15}$
(b) An astronomical unit (AU) is the average distance from the Sun to Earth, $1.50 \times 10^8 \; km$. How many AU are there in 1.00 light-year? $\times 10^{4}$

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76#

填空题 ( 1.0 分) (组内6/6) 切至整卷模式搜藏此题

When doing a physical experiment, Peter measures the mafsv0k2sxalr5 n- ,5p sss of an object ten times. krx psv-al s s,55fn02All of the measurements lie between $70.5 \mathrm{~g}$ and $71.5 \mathrm{~g}$. What should him quote as the absolute uncertainty in the mass? $\pm$ (数值) $g$ (Only put numerical value in the blank without any units or signs)

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