Physics Unit1: Introduction Measurement & Estimating

1#

第 1 题组 (共 70 题 70 分)

Four students measure the mass of an object, each u0;u- kf xocpv o+-7teising a different scale. They record their res0pvfoiu;x t-c7o +ek-ults 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 us:k5nq (sh93 p bujgn1iing a different scale. They record ti1gnshkb jun: p39( q5heir 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 expp:femzy*td4ujk:8 3 d ressing 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 unvli.pmlz4-i :;p g l(8;wdl nnits 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 SIzg8);a. i;ncfcnhp 3q 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 doet b0fin 3aqeyyk57z +;s the SI system 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 tim.woz291 y4w 6nrrpluwe 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 fundamenta hq y;8)fmys3rmn: c6hl 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-thousalv( q6ntz(k 4andth 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-hu5 90v eah,etkd bik-9sndredth 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 isbsl43 o yuui +3xd(xh4

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 usi4fn6 ukk3;qvf ng 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 betw )eoagobldk0yol g59s+x;j j;(5xtn.een

k m / 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 between ok/m 4sy+javt7a*sp3

k m / 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 ( 8v3aybr /pyffactor between

c m^{2}

and

m^{2}

?

A.

0.01 m^{2} / c m^{2}

B.

0.0001 m^{2} / c m^{2}

C.

100 m^{2} / c m^{2}

D.

10000 m^{2} / c m^{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 l*uh aj:zg3)0yca a*pis given by the equation

x = A + B t + C t^{2}

, where

t

refers to time. What are the dimensions of A, B, and C?

A.

d i s t a n c e, d i s t a n c e, d i s t a n c e

B.

d i s t a n c e, t i m e, t i m e^{2}

C.

d i s t a n c e, d i s t a n c e / t i m e, d i s t a n c e / t i m e^{2}

D.

d i s t a n c e / t i m e, d i s t a n c e / t i m e^{2}, d i s t a n c e / t i m e^{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 measurem,fhzcgkt1dfov5 ww3 0i 1. jgx4tbxc +s3-;b gent

2.58 \pm 0.15 c m

?

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 measuru(p 8) qvzoyu 2d78poiement 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 the0 1 rwawu(wl,r area of a circle whose radius is

1.8 \times 10^{4} c m

?

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 approxi4 27r vu4hmacdmate 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 significant f )bx 39t(l a;nay,ueznigures 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 0.01500 k m+tyjhe k)5a/1s5 duis

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.:eaek2j6cwa1e mdms0vq (m1( 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 significe e .)* au,*iwjva wwo4t.g6ebant figures?

A.

305.0 c m

B.

0.0500 m m

C.

1.00081 k g

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 c m + 1.976 c m + 2.1 c m

considering significant figures?

A.

6.7 c m

B.

6.75 c m

C.

6.746 c m

D.

6.7460 c m

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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 differenc ulv ,;fiy;v.ae 103.5 Volts and 102.24 Volts if they respectively represent two measurment valfy ul;;i.v av,ues 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 dimewwtvw0l7h u2 tl2i,2 knsion

12.56 c m

and

2.12 c m

?

A.

27 c m^{2}

B.

26.6 c m^{2}

C.

26.23 c m^{2}

D.

26.627 c m^{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 significant figures?d:91e-e ab5s(ul vf km-qyx, i

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 oi(g alitb.36)jar1 yyf

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, respec . r.wxuap84r 5hmnpa h1b6w+btively. Multiplying, your calculator gives the product as 0.np.rp 68h am5bhw.4wx + aubr168175. 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 ahbgrq+um*4.yzzx ff l o28b01nd 0.606 m, respectively. You calc qb0bozxm 18gf 2lyuhz*+ 4.frulate 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 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 a gfep1sieuzl0--8 8f(udwk -fnd 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(- ;t gg2zw8boff5n pw 13.7 m wide. What is the length of wgntf-2zpgb8 5(wf o; a diagonal 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 valuopwgr2/2c ;hfy2) ae8t0v-rzifwq3ie.

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 nota6ltqbf pvrn/h p93dn*6qo z70 tion (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 exx,+4jjqsir, e pressed 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;uv6lu1c 8uyc 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 number3/bb./vhp ctt ji7dm 3

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 hotg6+pgac2aqt 5+u kry e,73

(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 un cek.b/l(neia09af y1its.

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 whi5y)7m -o(cbig1 mj sdcch of the following?

A.

1 k L

B.

10^{- 6} m L

C.

0.1 L

D.

0.01 M L

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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 milligrams? 7b 4 :bgi k:5l.e++ p/vplqnz+eldiwt

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 kilyp/;g2 c +fdkoometers?

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 a n g s t r o m = 10^{- 10} m

and

1 f e r m i = 10^{- 15} m

, what is the relationship between these units?

A.

1 a n g s t r o m = 10^{5} f e r m i

B.

1 a n g s t r o m = 10^{- 5} f e r m i

C.

1 a n g s t r o m = 10^{- 25} f e r m i

D.

1 a n g s t r o m = 10^{+ 25} f e r m i

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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} c m

can also be expressed in mm as

A.

3.25 \times 10^{- 12} m m

.

B.

3.25 \times 10^{- 11} m m

.

C.

3.25 \times 10^{- 10} m m

.

D.

3.25 \times 10^{- 9} m m

.

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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 eq 57bcmzzdxx 33uivalent to 2.50 miles? (

1 m i = 1.609 k m = 5280 f t

,

1 f t = 12 i n

)

A.

1.32 \times 10^{4} f t

B.

1.58 \times 10^{5} i n

.

C.

4.02 \times 10^{3} k m

D.

4.40 \times 10^{3} y d

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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 gtis ,nr fg-+2.c+hjtyour height in meters? (

1 i n = 2.54 c m

)

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 i n c h = 2.54 c m

, and

1 y d = 36 i n

, 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 fathjea7kp5+h 2 4uou sc:aoms. What is this height, in fuh4sa 2p: 7+ckuoj ea5eet? (

1 f a t h o m = 6 f t

)

A.

100 f t

B.

600 f t

C.

1200 f t

D.

3600 f t

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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 anx wfhql0yo97m +rp4;f animal is 70 years. Assume one numerical figure, write thi4r0y7lqxh+9 opfwf;m s in power 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 iw4i 7+fiubrn7xl-esa (. jrb:s

9.1 \times 10^{- 31} k g

. 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 m i / h

equivalent to? (

1 m i = 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 dash?pj1m,u*q8 w hh8aqv6an-ytu) (

1 y d = 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 aren:(ukulwtg3e4b : b1q7(oktt a?

A.

2, 500, 000 c m^{2}

B.

100, 000 c m^{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 i n c h = 2.54 c m

, 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 signiyc 1xrd-:mcv)mcai: n2d 2 p)rficant figures:

1.00 k g + 1531 g + 2.54 \times 10^{4} m g

.

A.

2.56 k g

B.

27.9 k g

C.

2.53 k g

D.

2.79 k g

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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 l 7 kwf9aw;e 5.bqkj4dxong and 50 yd wide. What is the area of the football field,e;kbqj9wa7 5fwxk 4d. in

m^{2}

, if

1 y d = 91.44 c m

?

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 ovpbqz)9;s kedb2 (ay7 f 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 diameteri;yg 4 4+j/o xgsy.nm5dtcqv9 of 2.00 cm and an /qogvsn.4;j5m+di9g4c yyx toutside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, in

c m^{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 g qhmw nu2/q(r2j ku;+tq f418k) uqdfsurface area of the Earth in square metduq2(1g)fk n2+qqw;t /hkjm fuq r48u ers?
(

1 m i = 1609 m

)

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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 bp5d wo:-n ge.zf a-o,6w)f)dz:asuq flood is

1.06 \times 10^{3} k g / m^{3}

. If you donate a pint of blood to the Red Cross, what mass of blood have you donated, in grams? (

1 p t = 1 / 2 L

,

1 L = 1000 c m^{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} k g

, 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

k g / 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. ,0u6jxq,0): q nbs jy 8g; epgnwm.pgf What is the mass, in kilograms, of one cubic yard of concrete that is five times asjmpneu qb 8,0) :g jxgygq,p06fsn;.w dense as water? (

1 m = 1.094 y d

, and

1 m^{3}

of water has a mass of 1,000 kg.)

A.

764 k g

B.

2.42 \times 10^{3} k g

C.

3.82 \times 10^{3} k g

D.

6.55 \times 10^{3} k g

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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 beat8nk3os8 ;bgnripe/ 5 c5. zvurs per minute. If someone's heart beats at that average rate over a 70-yr lifetime, how many ekv c8z;os.npu3b5 irrn 8/5gtimes 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 schobuo)g m61(da p8xgcxwz r*j 1zzze+ 5/ol bus is used 3 hours each day, the average speed of the school buses is 15 mi/h, and the fuel economy /)jd5zz zx+cxgbr1o (z1*8gw6 pa meu 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 wt(h 0;tki;y c8n44i +g rlhx.u1leuaat eye level, 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 his feet to his cixunk04ht;hgi(1w;lr +8elu. y 4at 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 250jb+n5 sqoh 4zaaexx6h 0583tep7j*q l miles east to city B, then 300 miles north to city C, and finally 700 miles west to city D. Whna 43he5ptlbzq8 *ej hx 70qxjaso6+ 5at 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 shee+4 a(mjkj(gqht is double-sided) The book is 3.00 cm thick. What is the average thickness of a sheet of paper in the b(hj j(4+k qagmook, 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 cylindrica0q,bw m 7wz)98wtcl fxl cardboard tubes. If the length of the tube is 84.5 cm, and thefww 7c,w9lqt 8bz)0m x diameter of the tube is 2.40 cm, what is the area of the poster, in

c m^{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 nu :u3ilu ym,6mjmbers 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^{3} s + 8.3 \times 10^{4} s + 0.008 \times 10^{6} s

=

\times 10^{5} s

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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 s 3a;ykya, -;r3)mmmkv x-nhntum with the correct number of significant figures:

1.80 m + 142.5 c m + 5.34 \times 10^{5} μ 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 facev24hy9o :x81eg r: ihs rp.tytor between
(a)

1 k m / d a y

=

m i / h

given that

1 m i l e = 1609 m

(b)

1 m / s

=

f t / m i n

given that

1 m = 3.28 f e e t

(c)

1 k m / 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+kunz.5q ft--rlz. vid q v2+k travels 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} k m

. 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 mev (. )c civ5o4c)bx7hzvlav9 ,vj7bueasures the mass of an object ten times. All of the measurements lie betb xj7.b4ve),c lzi7)5vv v ccuvha(o9ween

71.1 g

and

72.9 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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