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, each using 5 x+is8lxkn, gb4hh3rf1va.g a different scale. They record their results as followsb3rf h 1g v ila5hx8x.n,4gk+s:
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 ob++tptf7q uekmk)4m ..h)d qfhject, each using a different scale. They record their )q+ +d4. ffh7tmk.)etkpu q hmresults as follows:
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 smaz/1h0za *s z e5f v;ppri0a)mwx dh:8yll 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 b evvmjd 1,z1(c; qd:lqase 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 contawgt2h/te+u) zww vyj;.9 z kh5ins only SI 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 systeb)q: e wol de f43i,.+zgrtlm8m 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 yw (p2m)ee * nnp9o)ezrsm6* ntime 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 fundamental unit2+dc 2 bcfun/hxvic(,s?

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 on7phd:hj )g:)vliyi 1qe-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-hundredst pc 6g6;h/awk*lf* vsa/w*d4gz5y uth 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 thousand ikl6*pbu1rgtzz, x + xuc2d/q y/f0 k4xs

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 4aj h08ow 2ttvprefix.

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 facthq3 9msjh.zt- or between $km/h$ 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 factor betweenvdmt/ p7s3a) d $km/h^2$ 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 faa7viu* 0iw rlbq5pe*n:bp/t ;n0 c :onctor 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 o .jz8fq h-rim zkg7rotx 5+sj7 4gu2xn0j- us;bject is given by the equation $x = A + Bt +Ct^2$, 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 measuremsbc-ygvt -x:;gy )e-ient $2.58 \pm 0.15 cm$?

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, dv0 fh u58kjshp9ecuz6q 5 vdp0hy)1 8is the percent uncertainty for 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 circlenckq.;kjoc6qbi7k9ln n p32. 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, y8b, k -izsd .48bkbfgand its approximate uncertainty, 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 significzpylk-1fhwpo r.7 -k7ant figures 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 significant figures in 0.0150- zr yi2 nzrp21wff3 f+-iaedu,dve)-0 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 is.kz( hb nuf01l

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 figur gz:w1lot3v,ces?

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 102.24 Volts if thpu9( kp bl2 kyhmv703mey respectively represent two measurment values of Voltage 7y92(pk3b hlmm pkvu0?

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 rectanglek afk0o 2*7xb y/+oxwk 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 1y,h8l hi3sir2.43 divided 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 ofc jl:9q2 6o0r mo6wp 7llvf8op $55 ^{\circ}$?

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 0.606u jk2uu5)n i0r m, respectively. Multiplyin2ni0 kuj ur5u)g, your calculator gives the product as 0.68175. 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 rectangle are 1.125 m and 0.606 m, rewj w8e*n1ok 6yazdz*,1y* sdm bij2-lspectively. 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 figures, this should 2yaksj-e61j* my zznodd,8*li*b1 wwbe 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 willxu t6d6ak0 1de. 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 widekxb3 ayq w ra5:vqxsf8e5s,+ /. What is the length of a diagonal 3xxrs 85 :w5s,fqya/bv+aqek from 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 v wc w+k)ziki,r28fhxjg ,w5z:alue.

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 scientific1*v0q-iaqoxq notation (power of ten notation)

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 ecn1keocgl-b* dun-8r 9msz/-xpressed 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 expres q1(q6ev9bi mjk(: zdpsed in 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 3 b5te,y1 s:thtej.h(ijuw y 0. qzpt8$8.42 \times 10^{-5}$ 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 v:afd cuh (;9w$(0.410 + 0.021) \times (2.20 \times 103)$?

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) numbers with standard unitsc*ha u qdo8,47opdajb/p+q6y.

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 followingw /m3sqo(u.k l?

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 milligk1p7id7vww rr q.9 aq8rams?

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 kilo+ve3 e/ ia,0gsjq53p wejem5jmeters?

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? ,j:b vws c,7ldslg8h a.0hje.($1 \; mi = \; 1.609 \; km = 5280 \; ft$, $1 \; ft = 12 \; in$)

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 inches tall, what is your heighat49htr0p1orv/rh1 lywwqxq o1 *0n4 ra cw8 8t 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 to an altitude of 600 fathoms. What is this height3ay0 b-7 gfy2 w0):xg jlki,ubahe t*a, in feeeb7ay l tu* x-b2ka)fawy3jh 0:0 gig,t? ($1 \; fathom = 6 \; ft$)

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,0 04lk2wfd zlv write this in power of ten in seconds2lz0wlf 4 0dkv.

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 c ;; n1c tc0m/zbxw +rqyb 91/r+vebyiis $9.1 \times 10^{-31} \; kg$. 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 kerr j- za+a 567 1mrrmz./ugw100 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 area3fo 8 m n:chm*a*4dkjo?

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 sig,l- is+axy 6zsnificant 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 b e9-fsgr5*n wyd long and 50 yd wide. What is the area of the football fiel9r5e n *sf-wgbd, 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)z,r*unnqo rs1h( sg0 the volume of the ball 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 has an inside diameter of 2.00 cm 4qxgw eg*hrdly.1-3 land an outside diameter of 2.40 cm. What is the total sur gl.4xyh-qe*l3rdg 1 wface 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 Earth6q+w w9m ji(ez in squ9z6m ijw(e wq+are meters?
($1 \; mi = 1609 \; m$)

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 7)3ts43o jh/ jjbm t zbnutw11of blood 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 yars ,c t99v;canrd. What is the mass, in kilograms, of one cubic yard of concrete that is five times as de, anvc stc9r;9nse 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's 80ds )/ zn9tpzipl.b8)uvgcn heart beats az n g.lu8p09vsn8t)ci/z)bd pt that 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 buses. If each school bus is used 3 hu0yxzz1 svu-0 rpu 7m*ours each day, the 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 r0z0*zu71- mvsxpyu u 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 a1q) 2t,+bx iwk zihvv0 flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes with the horizontal is 25.0 degre 1hwbv+)z t,i v2iqx0kes. 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 epphuvi6,2za1j :c;i east to city B, then 300 miles north to city C, and fi,zc: pjhp;e62uav i1inally 700 miles 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) T;l05 6eh0 (che *dyve9q xhwouhe book is 3.00 cm thick. What is the average thickness of a sheet of paper in the bo( cl deyo00hv;*xq5u ew6e9hhok, 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 cucpff,f2 xk8j2iiud .+ rled up in cylindrical cardboard tubes. If the length of the t+ 2 kxfuf8,df2ipc.jiube 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 c3af6zr mc1 d+f,ii s-of the 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 followinu wlyho* b (. /s. q3+p1rtp2kaww5bqjg sum with the 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 factor betwhntloy1zo 2 )(een
(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 travelmz:je42k vgl67iuoi *s in one year (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 th)v7p a rcs,z3ae mass of an object ten times. All of the measurements lie b,zrs cp 3va)7aetween $54.2 \mathrm{~g}$ and $55.8 \mathrm{~g}$. 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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