Physics Unit1: Introduction Measurement & Estimating

1#

第 1 题组 (共 70 题 70 分)

Four students measure the c(fwwh4c(9l2w5n41jq myb jh z3ey9 ymass of an object, each using a different scale. They record their results as followsnw 9y m2hz5byc eyj(l4w (hj4fcw13q 9:
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 different sca yu2 pbl4wgj+uk.4d;k r57cyqle. They record thei+b4j;y qy47 rcwl.u pkd25kg ur 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 very s :t1q82l-qtomkm jc *wmall 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 of the SI systcooo.ww a )qd18( z3wrem 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 contaiskq/0d9uhceix) ofg :y *y8o0-ua,p hns 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 syst 5*psme vy-df ozgn:ea7 ,f.k7em 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 time s7 p+24qeumi,bsz wkhd,v/o; 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 u8z48 sk( r2qmmun.l manits?

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 on.l: xgwjkniovhub( b6kq(017 e one-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 forw/ah p5y+a +-/vnmmace ip xz/s1h1-w one 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 forq;l,5jx v fhwf 3yn*e*oz 01jc 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 using a pw1fhku 6nnj/u m/m/9prefix.

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 betwe adiq5g..q fo2j *euz3en

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 a+/e-d -vqdp kb 2lp(zg4asn 0

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 factozsq w fyf 9h311kc2bt.: xmqh6r 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 is given by vq2.b0 fz xamp 9d18nhthe 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 ydjz1naj+pbtq h 3h.zj);.s, measurement

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 measurement 55:uhjb1,+ztr egse/b .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 iny 5/hz;k buo/ine48akd4b t5d the 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 approximate uncertainty, of a sphere of rad mpisv )ozhlxxg/w3 9y38c8g3ius

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 i5hxqjs t;szhv4til 21m ep554n 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 .a ine3d-3lbf bx7.dk 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 figurneb1f,2rs 3 t4kl8-d-tc bsykes 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 followinfhlms:57fm,2 p zo i4sg has three significant 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 difference 103.5 Volts and 1aid fr sx(fnv+j1m8(2lc8 1nq02.24 Volts if they respectively represent two measurmentcj qf2(sndrx(1i 88vnfa 1ml+ 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 rectangle witvx-bbbrwnv.a 94 vj7,h 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 2.43 divk+sx7xy f. wf*ided 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 of b;:tlwmitf;2il4;xk 6 vt(kq

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,9gq9 sw 3auz5y respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area shou 3 9y9gaw5zusqld 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 rectamhlc4j*/u 0 ;)n/1xyuthwy dyngle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by aty/ uhxy0d*1);4hnw/ myulcjdding 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 itsh0o e(bnap.ztrie/im 65e/9 s 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 at)p yg:(feo 5ind 13.7 m wide. What is the length of a diagonal from one corner of the gae:g ypi)5o(tfrden 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 value.48os pps; goz-

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 teoh (;3mocgt)6ymil - qn 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 belg c, .vv;w2vu expressed 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 exwg:3rb,ud2 lb:rnd c/ 61dgsjpressed 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 :j-6qy83,y hhsumeu *r nl5t;vf(g l b

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 o4cqp*; lusex,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 with standard/*kalb: ;kw0ndl7o ;z-sst hs 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 +9ksd a/ z8if* 7notcithe 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 m s0hj9tk,9bd+tpk*snilligrams?

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 kilometers g ns(jps3 g k0mzaw38hg4.f:m?

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 equi14xt a*; k:vortapd-gvalent 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 height in m7( hnh/ x-r(;muf8 crua hwh0cnw/16lunq)l oeters? (

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 fatho dkg-4kr) zw(k,2b+s*rq( ywrakcr c3ms. What is this height, in fbdk24rrk (-)wzwq*s +,rk gk3y (rcaceet? (

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 70 years. Assume one numerical (w frr;2ol*wszb) yc* figure, write this in power of os;zw*)yrb 2 (wrc*lften 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 is;z; zzm e3(s5p.jhu vq

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 d,nx zj+e g8:z emze+3lqr1u;cash than a 100 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 largest areap),5fe6yrnzj2g2 dze?

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 c,n *bwcdr kn10w8,pjthe correct number of significant 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 long and 50 yd wide. What is the ag4ia hel 2t k)pdl9/ed2tb-i.w9 :aw crea of the footballtgbw.ec2i /di2w k-de:p)thl a 9l a49 field, 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 3.238v1bxmz xw9/pp (j* em cm. What is 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 leng+co5 3z41y hgt)zyfsusy; gk4 th 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the tou;sgych +3 fsyz) 4z5ygk1t4otal 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 sux g xxg 20zbq(l7 .e+aynyd9o7rface area of the Earth in square me7 gd o20yx+ xxbqyz.angl(e9 7ters?
(

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 is -ke u.hsm*kgpb ,*l6mkm ) oxgt7(h 93ux4ziu

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. What is the mass, in kilograms, o6; vxuygav 68uf one cubic yard of concrete that is v6va ux8u;y g6five 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 minut;jw;pz(o zlt;oeb7g 6/r8ia ye. If someone's heart beats at that average rate over a 70-yr lifetime,awto/7z g;i 8bpez6j(; ;yrol 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. c4 l p9wt/bk0x qc4s*hp5qzn(If each school bus is used 3 hours each day, the average speed of the school buses is 15 mi/h, and the fn4sk 4pw/cqpxt5*lh (0q9 zbcuel 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 ey :wx sw0-a9ox/wrj *dge level, he finds that the angle at the wxr9w dw-*a:gs j0o/ xtop 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 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, thc h5in; g7x 80debjep55x/hpeen 300 miles north to city C, and finally 700 miles west to city D. What is the distance betw87; diehneh/bx5gxp 05j 5pc eeen 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 doub.qg/:6s bh2jsz gzl4/f mc:rhj/fh 3h ig2 t;jle-sided) The book is 3.00 cm thick. What is the average thickn3c/:/4s.t2h6rhl :h g gj hbq/gj iz2sfmjz;fess 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 oku:9v ayzfc;;41 et mcurled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the diameter of the t yzt :e;ao;kf4uv1 c9mube 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 numbegc--u e2,k3d sgba5su0xyw/ n .ou/yors 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 c:pv l ipq:,ejnnqr9 4a)ggo24zpf m/3orrect 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 fb sosl,kz 2 +1,7se; wug)uytqactor 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 travelagydvwh 4l:i s;c k4*083gwaws 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 experimenthkoz/ * j+tq*u, Peter measures the mass of an object ten times. All of the measurement+*/zqhtj *ouks lie between

69.1 g

and

70.9 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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