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, a45cb tv;uvhvdx (w+;)gvh u3 each using a different scale. They reco3t5a bvgd(c4hhv;; x)vuwu+ vrd their results as 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 object, each usgilz5 bw/ gk/do/65nuing a different scale. They record their results as fdlugown65 z//k/igb5 ollows:
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 expressing very small or k zol+i6hm k6ozf 1 2*srhg;s.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 followingcewi,* qcw8xg3d o 4;/oja *xb are base units of the SI system except:

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 SI basic uniz +owe-d5alujwvaft ) m 4,;dfy, d9v9ts.

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 system have?ixxx+o+f1 n1n+2w9 skgk x30,fdimwp

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 time i izxv,n 1dl99vs

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 fundamental units?x75v rjiqn4kx ;n,j/ r8c j azquu*8-l

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-thousandq16htyz7w+h yb*2uy kth 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-qkq9ykp2+.l 1v0b yaf hundredth 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 one t)*pbrds0bo 7 qj9r7szswc ,r/housand 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 prefi bp7nkl4 b(/wvhysn 5)x.

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 bexe ,+q). teh6e:hpw pptween $km/h$ 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 7cy261xn gpyyfactor 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 f)t o(dww 42ommactor between $cm^{2}$ 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 equat 5b1m8 sv )e6aj2, facth:uscuion $x = A + Bt +Ct^2$, 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 uncertainty in the 76s y;kul*nc rn.ud3gbohe t/fh26/ d3 j8f wnmeasurement $2.58 \pm 0.15 cm$?

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 for the measuredigu07 4a+ z +.e dcx :aphn +wctk9p1.hwjzh:ment 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 ikjpivbkow6v8/f i sj2c-i0 29n the area of a circle whose 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 c -rld7v--n)ra4r6dwo3 2qyn(ktmqb , of a 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 figkhf10tcu3 o6.cf 3wh4o iflu+ures in 10001 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 signifv :8k9ux3bt di4 ezr6uicant figures in 0.01500 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 in 0.040 amo3pa )vpb8 34jon x 6xx-;i audsi+4is

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 significant figures?c6*o)n6hp *uwwsh ;; td6cd0 e-heewi

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 14iz/3 ikatxq 22g b2nr03.5 Volts and 102.24 Volts if they respectively represent two measurment values of Volb/aq2tr 3 gxzik2i2n 4tage?

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 recta5/4;xz4thf1xmo1vcs rg7v 2xuo)o n wngle with dimension $12.56 \; cm$ 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 dim(: gv(eb2wi;h il 7cjvided by 4.561 considering significant 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 o8ztp) x;jfm2 kf $55 ^{\circ}$?

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, rew cl5s:ki+gqaoh(f1z 6 y;p )yspectively. Multiplying, your calculator gives the product as 0.k yhc;gw6op)fa1 q (zi+ys:l 568175. Rounding properly to the correct number 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 rectangle4nwb0 ama.4 azv-sf+t 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 significant figura4tn4fm sb+v-w aa .0zes, 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 and 1.5 m wide. What is its y g xcsjk-vw7; w:w6nts/y le 376sma7area?

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:(4tp6 5k r1iq mwfefc wide. What is the length of a diagonal from one corner of the garden to thefm q k654fpt( rwi1c:e 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 valjw j -3 kqh6t1dul)d3oue.

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 notatifbv3 ,r8c00bil ves l:on)

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 expressed t4 ,fd- ortxfz6iq5s/aff66 o 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 i(3hfmo u *dd*sn scientific notation 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 number )9zv vfzur1wdjg ) :a.+cyt oo,r.umy6.2eb o $8.42 \times 10^{-5}$ 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 wejipj , 96y:p$(0.410 + 0.021) \times (2.20 \times 103)$?

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 full (decimal) numbe0vatbbh / zyjoy-u0iu()79 gzrs 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 to which of the followil c( qncim22b9ng?

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 millx-qh5 9psm8(*cfq j lgigrams?

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 kilog(1 uhz tzp7 8/j 14:z-pjzoyc7xdwuometers?

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 following is not equivalent to 2.50 miles?f )r84hx:y4(h hyfv te ($1 \; mi = \; 1.609 \; km = 5280 \; ft$, $1 \; ft = 12 \; in$)

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 ini2r ,m .fp l7hlrsa+;fches 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 lky( 4c u6bpuwlb84b,to an altitude of 600 fathoms. What is this height, in feet?8uuyb,bkl(l4cbp w 46 ($1 \; fathom = 6 \; ft$)

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, :8fntp8x l :aowrite this in power of o: 8:8tp fnaxlten 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 electroz t tg+n8nr,*wn is $9.1 \times 10^{-31} \; kg$. 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) is a 100 m dash than a 10jr ack ta(pou(a, ,aj74tk-s*0 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 a:jh6c4sxi-mm ipp 9.x:t6uferea?

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 numbqc e ,/:aglfkxi m)0.xer of significant 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 120 yd long and 50 yd widx ltw2fx o*n2t5kg1:de. What is the area of the football field, in t22t1*ldn kxf5wg: ox $m^{2}$, 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 ball in-nim74/nvazh 1 k(tbc $m^{3}$?

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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 has anv40zw .o2xrsr inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, in 2o0rz rswv.x4 $cm^{2}$?

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 i)qid1f +qivq . )luw.5ubng,t s the surface area of the Earth in square meteq5bi,lvf..+ntiu)q) 1u w q gdrs?
($1 \; mi = 1609 \; m$)

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 blfd23 f t0j2-mm ps7igj-zr h7dood 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 kilograms, of one cuq/r q7 m3g0v wp:h)m)2xtxhfwbic yard of concrete that is ht 0 m)xhr:wm/ x 3pqvwgf2)7qfive 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 someone'wjic4 1m; 6y4eskk 7ons heart beats at that average rate over a 70-yr lifetime, how many times woocs j mekw1ny476i 4;kuld 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 q(dcdx50 w i0nzz;d m+pme0kca7:/q ubuses. If each school bus is used 3 hours each day, the an xcq e(piu+z0;7z cdamm/ 0:dkq50wdverage 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 leve(na t; n*k3oa-yscd.jl, he finds that the angle at the top of;c 3 kys*n a-djtao(n. 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 miles east to city B,bqp9nf)*; sb oqwd7r6cp0 zg. then 300 miles north to city C, and finally 700 miles west to city D. What is the distance 9nzw 7*qr obd6pc ;)bfpqs0.gbetween 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 numberpfp . utrcjpzk:2* 5y3ed 764.(each sheet is double-sided) The book is 3.00 cm thick. What is the average thickness ofp 3cz25puf y k.*:jrpt a sheet of paper in the book, in centimeters?

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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 usually sold curled up in cy3e/kg* ofb/ielindrical cardboard tubes. If the length of the tube is 84.5 cm, and the diameter of the tube is 2.40 cm, what is the area of the poster, in gi of/ k*eeb/3$cm^{2}$? (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 the following eta:1,3mmnm y 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 the correct number ot 9qan /ya4l rfwh67(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 fau2w8h am3i9cp ctor 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 (e dyp93ri3h itg 1- **pzdd.k0wq fk4pat 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 m 7/ubr0loofw f lrfw x,y5735aeasures the mass of an object ten times. All of the measurem,/a l7y73frwobwr off5 x5ul0ents lie between $47.7 \mathrm{~g}$ and $48.3 \mathrm{~g}$. 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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