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, *ib hu5h;:uxe+ezhy 4x(: zhgeach using a different scale. They re4b ;h:xeh(hz g:h5ue+ix zuy *cord 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 using a diffeeq4uj)7 gx5l4v)*wbfs,iud o rent scale. They record the vjo*d,wfq4 7u5) 4xlus)gbieir results 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 vazmis)w 1rv +.ery 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 avu,rw nf*/e95 -*j d6gdxl yyof 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 conixod/g n j:t)5tains 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 system hasp6.ru k vn/(mve?

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 i(kxe h k/*q/ztime 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 fundamentasdqx; g;2pc:hl 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-thousaqca0o zqb apej 9fz1-a5xsg9t 1t45 :undth 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 on x*lzsb nria,6p3:pb7 e-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 thousand gw)1,bjw22vf ze 8s8psa jx, ui,kxo 5is

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 mo+m.+wplde:p6mi9/op.pxf rd7w 6y using a prefix.

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 betweezokem )5/zgw1x xx3rgs- :oi 2n $km/h$ 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 betmq95n ,9hce7 t vm(jy* ytox2t45hrv1 czxyk9ween $km/h^2$ 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 betweeng+:f adgoz+r+-3s d1bexq x s4d s;bv/ $cm^{2}$ 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 obj9pa k:-c+snttect 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.x6u3fxiqqc ( 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 umu 0d4azosx*,f- azj ,ncertainty 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 bgp73u5 i /mmn hx05ubarea 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 uncert 2p4fbd1+ yqi))yuelkainty, 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 significkkzr xzn-t)kx. ,kq/.ant 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 figur vggp4onnsu24 os;21b xs2hd (es 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 r9i x*kr9lv,)lnj-r m0.040 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 significant figure xjwsq/ vvkc9dw)i 1,y3:,mj ss?

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 they respectij/ b-.1o aqd)upthwg9vely represen.b-ad 9/p1jq w uo)hgtt 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 rect(boki9o7 :j4arl,uh4 t uwc c7angle 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 divided by 4.561 cons0o :x5 s6khfo1ylr /i4dbi0cji3a l q/idering 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 oda9 ev+r zg bx91k1qd:f $55 ^{\circ}$?

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, respajctxs-.a 2:r9, gp l-bj+n f;tg -cgxectively. Multiplying, your calculator gives the product c+,t:xx g-j2ln .-brt c9g-gjsfa;paas 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 ar34f,+ nihd /o /ff7fpod4ov a:a gsfo0e 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter bg/+d4if0hfs po fo4 dvo3a: ofa/,nf7y adding these and multiplying by two. Your calculator's display reads3.462 To the correct number of significant 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 and 1.5 m wide. What is ih ne29ebp3,k4mx+tlaxwd i 85 ts 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 wiqu1ze: b: he3ode. What is the length of a diagonal from one corner of the garden to the other?3e1:ouq bh:ze

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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 vgfp9:fb6n vk7q/xec+ 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 scientifio6yezjg-282hz-sb2scj4yh k m t- gb7c 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 expressehl.y6es-ztqqy8i0g 8 d 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 not 9vpe4-)t o3igcii6xeva:uz 9zj 4t *bation 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 wuovmj1/t8uce p 5*8h $8.42 \times 10^{-5}$ 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 o qyqvkikj tw;)zj:i -b.k.jh,-qcw,(f $(0.410 + 0.021) \times (2.20 \times 103)$?

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 wileu+)x ojgy- xr-li id) *:fm76b8 opana85evth 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 pw 1mq,:wmbbmodb(7 ;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 milligramsa/e2vr 2ryb.nytei pe;j(6v.h 5s ou6?

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 si)le q(.s ;dld5+ hdbxpxty kilometers?

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 0 :cg k258 msqle*wvobdk3d9t24m dhe2.50 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 inches tall, what iscn8/oqqqqwi8l2/ dy , 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 to an altitude of 600 fathoms. Whad1fut2wmie4fs94g .et is this height, in fee4ee1s2dimuwt4. gf 9f 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 fb2gcepk*x 73k yz.1qr:5c on uigure, write this in power of ten in second1uno 2g:bkr5 xep.qy zc*7 k3cs.

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 electw 4+-vacny4a w:,is cpron 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 100 yd dash3x - .yg;fg4 vbazfkw5hqv;-l? ($1 \; yd = 0.9146 \; m$)

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 r+v lvl;clpchqa*i554 pl9: uarea?

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 significant figures2lfa. fnka:u z3u*6g x: $1.00 \; kg + 1531 \; g + 2.54 \times 10^{4} \; mg$.

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 rwao(.ev+ c otd(:d 5jyd wide. What is the area of the football field 5c+edvwja r ot(.(:do, 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 therjes 75pva87q eda69s;*tul n 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 cmlw+y7)4c v; z*1y9sc vmd*zn xdte-g o9 obq-b has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. yy1*znd-vx;v d 9)qocs47lb m9* -tbzewgc+o What is the total surface 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 u pd;u-qbl (zj(3qf2 /m9wxhu the surface area of the Earth in square meters? 2uj fpzu;u-qlh3b(/( 9qmw xd
($1 \; mi = 1609 \; m$)

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 blood icwwa:a7/ a/9sngxr ; ts $1.06 \times 10^3 \; kg/m^{3}$. 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 t-7um 2l (kmjfz )4qnpfhe mass, in kilograms, of one cubic yard of concrete that is five times as dense as7f )mu (pkln zj2-f4qm 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 9t-g o; k,psd+9aizfw. If someone's heart beats at that avazog-,9st9dp if k ;w+erage 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 hoel+fj87kem*m8q8e ftvxc v)w e/s*7 1 bbb7rvurs each day, the average speed of the school buses is 15 mi/h, and the fuel economy of *blect/*x1ej7v8fkvq 7 b8e78 m)v+mwbers fthe 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 ls.5+tqv w8joxevel, he finds that 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 hisxst5o.+ vj w8q 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 cbtk, arrd*w49bed m (1ity B, then 300 miles north to city C, and finally 700 miled*bw ra9r(k mtd41b,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-s nd hyal+x.u0*ided) The book is 3.00 cm thick. What is the* x+hdl0ay .nu average thickness of 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 cysbw+/: g6 uapflindrical cardboard tubes. If the length of the tube is 84.5 cm, and the diametepw+f:g b6s/au r 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 the ;kd n(v5vwwl ,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 the correct numbcy o57 8euef3zer 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 bet: mq3l65mw-zrojjha q r +7q6xween
(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 (at eaa0 ,):js4mp eje:0g2zcolmoed57q 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 e1*)p.hj t i1si2gdg xqxperiment, Peter measures the mass of an object ten times. All of the measurements lie between iihxg)d s21p. qg1tj*$21.5 \mathrm{~g}$ and $22.5 \mathrm{~g}$. 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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