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 anfr 6a m73y0qpj-t ff) different scale. Theyft7nam jy-6 f)3qrfp0 record 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 /(6 lr,s,7dvbc qyzys an object, each using a different scale. They record their resulyrlyqs 6b(7 svd/ ,z,cts 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 expressin z(c uv3f*tu*ya 4; +fupxna;gg 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 araim m;nr1)s g6e base units 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 SI basic un m9s ne-hark-ok:dg9dj(7* lnits.

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 62 dw5rdaw0y1cqj iu5qt y/ n+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 ti6 ycj as* .an/fqh8p5cme 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 unit5pjpkynds3) bif,)d g)(gykz z;, fy2ibv6p9s?

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 ;mu x*,h57* oj v- hud: us0fjckqyr.jone 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 for one w+ 45./kipgsq(m zl4yuljcb0one-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 thousandreyhhw3)r*gm )w2 po 8 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 dayuy/99nl yjiu2j- js1ys 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 conversihd;,)foet9u dw2 *-s l.nqivr on factor between

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 betw5 xdm r2nhc ,ug9t:zx(een

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 between xm6fzf4. 6p zrp *0orb

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 objectmmlwq5*3.i clil6k 5/ to fs2h is 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 meas3 bc 8b x,bk;h.yci diy:v2l.lurement

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 them i+kc,y epti d;.-n,6 w)gxxc percent uncertainty 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 area(y,ty i,b/o zf 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 x*am 5s,hk8 9vklqp0ja 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 in 10001 i8fe:c ai7k. bx blf0n8s

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 6 emu wn.0k. 7:aczomg0.01500 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 figurel;v-o90ok * zaa7gpzqs 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 significantkk,u3)pi5wlm 3xuui6 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 102.24 Volts ifkh :rof7xc;si + vi*mx9ehw9u ry5q-: they respectively represent two measurment values of f9k*hi 9rc;imy :-sr5 x+oe qh :xwuv7Voltage?

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 dime6 r)spm9op u.bnsion

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 s; ,u+x* rhxz2ldf 9gadivided 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 oz/*n.fi8 cp cyd11 agbf

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, resf)hrw q 2/n w gl zaa5cjp4gn*irg:682pectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of signifz2 2iw/68 5 qgn)pf lg*cjawr4:a nhgricant 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 rectangxd4xe0 qj (ax(tvs. b9r( 2 2arbirtu8le are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these and m(eb jr 8r.txqb0 v2itarxs( (4xu 29adultiplying 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 anv/grw*6.v mw ol9hus5-l55p(mkuz*p j)my nod 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 cma6hj i*(:z iquc2; a15 m long and 13.7 m wide. What is the length of a diagonal froz mqa(ai cu6cj;h:i*2m 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 value.ay9:zsh ip4n vcu1 j:,

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 notatwk x- 6 gtgt(xe61ic v i4k(z55bjasl8ion (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 bz3dguhwu8e. 7h),iunkve3 3ge 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 expressed in scientific notati,,4cp5 1eryyii s mb)bon 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 a6np zwn8.5 n4nhqb8k

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 8 pkk1447ol5oifa eejf

(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 gig6pudus ld,o5yp5o/ / wameters as full (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 the follow:n8plo p*nom)x1:z1u8 r krj n9aj8qx ing?

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 mil))lda2kia0op f ;kd(kligrams?

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 kilgw g qp9+-.h 8-2r rywwvcewr1ometers?

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 equivalent to 2.50 mil ndfk,z,p. +jmq; ;ujves? (

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 r94 (9lrrh *t lhu(hbh)ogy p3j(n yz1tall, 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 600 fatho d9wyr2ou v17+4g-l muosazz1ms. What is this height, in 9r4uwvg1dzy s7 a1- ml2uoo +zfeet? (

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 numer0kgi3(cm y6yce, 8 iikical figure, write this in power of ten i y mc8, g6k(kei03icyin 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 elect7aff.25q2 xgedgiwk )+ex, c wron 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 yi-ec0-d id2c7v lme3dash 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 4e83(h jdmz-2g iegrsarea?

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 followingtw-x 8yo18k mx sum with the 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 area o ws 7 :c3c+q-kfcrq1vgf the football field, :+g-r 7 ckf1swccv3qqin

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 t b:oy ys )l(39d,dcs70 pptqvuhe 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 insue)bia hw9 fd3z42 x,side diameter of 2.00 cm and an outsis e9 wa f)4diu2h,zxb3de 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 u.k)gx 8vytt epi0k 9-mi. What is the surface area of the Earth in squag x.yku)8pkt9t0 v-ie re 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 blo:nxre 90w*if2 : bxyhnod 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 the mass, in kilograms, of one 15yn wy8.hhth cubic yard of conch1ynh8 5w t.yhrete that 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 hearty6*,jddrn,o6+ on rae rate of 70 beats per minute. If someone's heart beats at that average rate over a 70-yr lifetime, how many times woul,jnrend oo6r*6da,y +d 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 haskpg ; 1lqlm (j16.l+gzs fdce0 300 school buses. If each school bus is used 3 hours each day, the average speed of the school buses is 15 mi/h, and the fuel ees(0 glcpj6m 1q +zfgd;lkl .1conomy 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 eye level*o /;zbp5xj8 u6 sbdve, he finds that the angle at the top of the flobx*b5 pj/z8sed; u6vag 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 d ( kn/0x5 kp+tghtbet-rives 250 miles east to city B, then 300 miles north to city C, and finally 7/k+htpg-0 tkn (xtbe500 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 764.(each sheet is9 if/.7bhh b +)v0s.raliirw o double-sided) The book is 3.00 cm thick. What is the average thickness of a sheet of paper in the book, hb0/i7avf.is)+orlir h9.w b 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 cylindrical cardboard tubes. If t 8 c+ pv3mh46.bo gux9rmaq(4hlbxe:zhe length of the tube is 84.5 cm, and the diameter of the tube is 2.40 cm, what is the area of t3p 49zqahlvcum ghx 4b6e+8o :m(b .rxhe 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 numbers have: (aq je; z2,v6p 4k 4*oodqoi.po p(pf*ue) 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 numz0lrdpx w8q*(kin+7 hber 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 convers unb4,otlnlf*(0a gg(ion 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 yeagr zb0+zb7yj.iq : / z(riflae6li i,-r (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 hsm*ps;dx/vy00(0npa+jp fothe mass of an object ten times.j;psds/v 0 m*0+pa0 (hp xfony All of the measurements lie between

71.2 g

and

72.8 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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