Physics Unit1: Introduction Measurement & Estimating

1#

第 1 题组 (共 70 题 70 分)

Four students measure the mass of an object, each using a d wz(oo ai4:l4different scale. They record their results as fowzi:lo(44oad llows:
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 differentgm- w;w*ai qgv*l26gfe4fy * p scale. They r e;2gggfamv* i-w p6q **4wlfyecord their 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 ver9i rx/b6vf6jw*mwflwbm 2; .ey 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 of1hckn;2gg 0 ewf)+am b 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 contai ka:*3.b oqozjns 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 s 82(u ik,:qfdlp w0x9*hzrv poystem 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 timezynl3.ta /mmm5j26y k 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 unitsd8j4/mf4 n bo-6ejqyv?

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-thousand( ld8ssq1(,o za yic:pth 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-hundredi 4efv8rpek +5nf pq8.th 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 thou mwk+ykhb/jwe, +,j)osand 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 :zz8zo ahbsnb2d( 7 5yprefix.

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 b s;3jlwa(jhkjikp2 ,.etween

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 conversi0c3c+u/low invgv :i: on factor 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 factorq36wor:w8 r-jedfa k9n eq( 8h 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 the 7)7flsr ky5rdequation

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 io2af.i8:podzd 4xu 7on the 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 fot1a91kriqy jn t6ao;2 r 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 a o+4-tjnoglno 4::nxjrea 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 approximates4swhze29 )e i 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 figujlp44x2 i.o wores 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 fzlalyoxwb6ed:. c-zqd91 8w9igures 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 0.040 )rc jib:y:nmv 8a)gmy 84hu 1wis

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 t,jv qk j9o k .2oct87bed3zjf,hree 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 V np+;i,*:.vahe z)odod; o(tr/m8f rv nx*g okolts and 102.24 Volts if they respectively represent/*,;;mioxnteogv( f kd p:nvr ) rad+z*8.hoo 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 rectangle with wz4qvuq4(owdt7c:1efq*5sd 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 divided itdml; )6ef9cy8,g xsby 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 o c0,b,bn;snkxf

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 lnu*.e.jixal4nna ak z14 8 r2and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area should ber4a4i2x.jn1kanlza8 eln .u* 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 rect1vb50g8eu comangle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these and multiplying by two. Your calculator's display reads3.462 To th 5o gm0vu8b1cee 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 / qm(io/f/lepsj x na9g0-6agwide. 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 widejjt77ei v r h*es /1;xn9bez*z. What is the length of a diagonal from onesbzejetiz77evh 19 *nx rj* /; 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 olzs.zzox ((+ value.

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 notavs8xau1 t +jh+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 expk*g z)r)c)r esw +p2kgressed 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 e-cpmy,f.)sj(j vut6( ( byd bgxpressed 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 hr z) xst6np6(wj; ym;

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 of89cgq 0.a0stju /na- 3silxh,fr j3ka

(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 fulaz8zgr0n2*e+rwc6a:ex7c7 jb lzf,e /x;y p el (decimal) 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 theb kacjv-ps1f tx/:0(e 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 m8 i1owg8lma+silligrams?

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 kilometae pm 8f-s8o35ycn b*eers?

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 equivaln pb ;tb:q/6d7rr5tum ent 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 inc-tgmuu 0v*o g1hes tall, what is your 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 6003xnhutsn2 ;t*1qk ,u c fathoms. What is this height, in f 3c*unnk,qtthus2 ;1 xeet? (

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 w.yi*40w em )sxi+2xlc io1usone numerical figure, write this in power of o* +wy)eiiu20s m i1scl .4xxwten 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 z37yoh4c vuv*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 q 9t 4yvfs*om)e6+hth) is a 100 m dash 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 are) hy o5r86*xiie2io bpa?

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 nrwkoi5b upj lbb75 -,ky. j-.qumber 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 504 4zxpfvt*im : yd wide. What is the area of the football field,z*pfv:t 4m4xi 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. Whagxfr1+:+tte)ea*rb *u c u8hdt 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 length 20.0 cm has an insidt88 pkz /0 azrkk9n1jke diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, inzk1a08kkpj 9 nk/tz8r

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 surface area of the Earth in r 7 9/vtd p43m raflej2v+yl7osquare meod7fmty r+4a9 l v37vr 2ej/plters?
(

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 nc7ee+(nfp9b 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. What is te6(pn j jv6p-mfsk j50he mass, in kilograms, of one cubic yard of concrete that is five times as dense as water? 5pjk6fjsvm(e p6j-n 0 (

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 bl,ga 43/sfwb r dvsq 0(uasg2*eats per minute. If someone's heart beats at that average rate over a 70-yr lifetime, how many t3b,(vs/4s0* g2rq daflwgaus imes 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 bua u3h+c vlf3a(s is used 3 hours 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 r3uaa chv +fl3(un 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 proa*vjdod 67hi589 goma tractor at 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 hiv o ajdh*d57gi8 a6om9s 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 cityezfaa+guu89: dde r8 0 B, then 300 miles north to city C, and finally 9+efe88:dr au zda 0ug700 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 7b)jmb 5l:q7/.1ucz cwd/5 gxvaeev(a 64.(each sheet is double-sided) The book is 3.00 cm thick. What is the average auv.j/eve5c wcqgx7: d 5)(/ bzm1albthickness 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 )i:3ca6l lgpl 5d,mxpin cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the diam6c glmi p ,x:lal5)3dpeter 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 ft8gn5y ab kri.t*d 80bollowing 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 we- sxhuh f,29significant 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 converscpr95 g oq;u6mion 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 distance light travels in one year (at slg se+fucy..zg5 *3e pg6x/kh peed =

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, Pete,ns6i) -2 5me+mxji4drkmnvg r measures the mass of an object ten times. All of the measurements lie ri 2, njsmni6v-dm+5m)4k ge xbetween

49.7 g

and

50.3 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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