Physics Unit1: Introduction Measurement & Estimating

1#

第 1 题组 (共 70 题 70 分)

Four students measure the mass of an objec n*w) 0dwvnznqg .f9+lt, each using a different scale. They record their results l *n0dwqnw+n .gvz9)f 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 usinzitc hap+ yp 3fmeb) (mj319pwr6a80qg a different scale. They record their results as fow 0phz 3ry3picmjf+ t)6e( 8pab9a 1mqllows:
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 t)*-jat .dwo6 qdagb: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 mc j rp:bfd*dp9h*9x- 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 whiczhrs e u.,eqd:qg( mz, q126huh contains 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 doe2 )ogb 5z2 y5manflhhf9kes 9k3b-/i os 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 .j8juh,5)sv n5i0) lr ls yipbtime 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 thensveo69qhc68h1 ew0us7y ayl* pj-3p fundamental 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-thousandth is7;7 1lhgu8vunrwpd9 3y+k+llugmb/e

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 on u6)zkd;)gzm-oe5h 3.kw ryjte one-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 forfp e+mps- * n/jp af77org12gl 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 usinl; nol.t -u2yr t/jju;48) 83ada woed.jp areg 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 betweoo *o2d-y *j ou jwj/x37qwsz3en

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 factoro,a*fw (q yue*7.f(odb 0bp b1q3 synv between

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 factor 4vu .po xxw8m4z yw28et3 z*osbetween

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 is given by vou :.og ,mj *ynkpeeuc,2va (5.;rsh 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*2ntk 0vxr-oik h+:j2 pld1yfent

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 measu n2a924do0 wml5ip+mscaqvfb)s (l8 grement 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 circlek,n ypv1hy. 2 6x82 4fc8kr7qikrk qyg 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 iccrd o7s: ubi+vfw3 ,dtc9g/0ts 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 significant figures it2/l5.(lchnwfvhq- f; -nc gd n 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 figik-k i1sqhd),e,y90 qxi v 0yvures 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 significjtk28c9sj4bd6t u wfx n1qt* 4ant figures in 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 significant figimjdy9l.f/ t z v1c()r-83uky-fqwncures?

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 difference 103.5 Volts and 102.24 Volts if they respecicnn95+lo,q+mc a u a+tively represent two measurment values of Vol5cna anql9+c i,+o+m utage?

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 rec jsdw0p :wx5 h a)gf1w-phcb :clg8 /))vv,bzutangle with dimension

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;:mluzdcv+ f+l z*mi- 2.43 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 oflq6a*bvc3y*ez32 ao e

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.*e o6wms )xxe0 Multiplying, your calculator gives the product as 0.68175. Rounding properlywo0 s*)ex xe6m 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 ty j* e+1egag ;aw2hm8rectangle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding tg *e a1w2jh;yea+8gmthese 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 itsz f;2fc9h8rkbw fd v3+ 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 mi ss(/v fm7hl;easures 15 m long and 13.7 m wide. What is the length of a diagonal from one cor/lvhs;is(mf 7 ner 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 valz,hv l0;g vq vclil 18kmy9+2aue.

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 (pow 5qicxrzb033/ tf gg+iv y7*vrj 13xkwer 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 exgw7f j:+ 6pkyspressed 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 4g1gox)sf 6vqexpressed 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)jemob vf) k*-tbfk,01m(lo h

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 ofnd jq1 *ly--rn

(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) k5gmy.8a)l8h cpd,jeun bt+)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 to which of the folksg*p j/sb:.zk )906kbds eck lowing?

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 milligra7* bxrqypq hf r5dh3 o+3lg:c)ms?

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 ka60 w cg*il-noilometers?

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 is5bwfm o3bcu,7 not equivalent 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 your heigh78grmm7 .fel1: 7k/vfw o idi vo6ghj0t 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 fathoms. What is this height, in ytzpd0y pj y7t.n-*7qo wji8. feet?yt yp *7.nwo.yp0qidz7tj8 -j (

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 an animal is 7(uwp, osf mx8w,4s p8; impzs:0 years. Assume one numerical figure, write this in power of ten in seco48x suzoimmppf,,;w( w:ps8 snds.

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, ;zo x/)utxgv is

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 1007rz 9*:4r.feggq f xlmt*jpo0 yd dash? (

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 largestro) ix.;pb,hbhj0 6mfyz3 5ne area?

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 significant dkhbe12 0sz12e 42fw2jmd o(s z-buatfigures:

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 long and 50 yd wide. What is the area of t.o. e96t v;h p1dzecorhe football field, in ;zrdo ve. ohc6.1e9pt

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 of the ball ia+q m,s01u/ac ink ,ckn

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 lenge5x *5cmh to2cth 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the h5*25e oxmctc 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 39z.cxgo - qdx 5f2jl(t:/y0tnb63 mi. What is the surface area of the Earth in square2qfd/bt:jz l5n- xgxyc0t .(o meters?
(

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 blood iqasb-;-o8x 2w +ly sdms

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 yar01 afjq,amya 4d. What is the mass, in kilograms, of one cubic yard of concrete tha, ay 1qa0j4mfat is five times as 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 beats per minute. If someonie u,u6jm- oiv;+4es ae's heart beats at that average rate over a 70-j-+e 4ami s,6u;uive oyr 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 schoojf)2nbx/ +m- wmq.ij bl buses. If each school bus is used 3 hours each day, the average speed of the school buses is 15 mi/h, and the fuelmj. -+ fnq/w x)b2mjbi 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 from2a07arb8 go0vlymsa1c 76mvl a flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes w2 6ol70a ga1v7ybr cvm0 m8lsaith 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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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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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, then 300 miles nort my naoic1 *m1nplxs7o8q 6,u3h to city C, and finally 700 miles 317ypi16om mlqn xau,os8nc *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 doubleyplu)+kpy1+nxsh c 52-sided) The book is 3.00 cm thick. What is the average thickness of a sheet of paper in the book, in cent+xchl5p)1p y y 2s+knuimeters?

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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 curl2 ue8 dj *ou58 kjyfbemea23,ked up in cylindrical cardboard tubes. If the lenkd e8jkjm 8b2eyoau,u 52e*f3gth 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

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 eae2wtz fd05lqbmo *1 *jch 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^{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 sum with the correct number of s o*, fphune(-juu 2guj+- r,wtignificant 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 conversiin nv(n,m.u 0 ddb+st1on factor 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 di m2pi9qv5nm;wnvon/ n h;,4ywstance light 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 measures the mass 2 / 9lt)sb+x3xolvo ekof an object ten times. All xeoslko3 tb9 +)2vx /lof the measurements lie between

75.7 g

and

76.3 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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