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PRACTICE：Science 10 April 17 in-class Practice
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 Author: cwphysics    Total: 34 Marks  Marks Earned: _____________

User Name: No Login  Start Time: 25年04月17日 08:15 End Time: 当月25日 09:35  Switch to: Whole-Paper Mode

Mark Problem
1#
 
Single-Choice ( 1.0 marks) (No. in Group 1/27) Whole-Paper View eid: 782  R:W 103:82  Correct Percent: 56%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
第 1 题组 (共 27 题 27 分)
  Suppose that an object travels from one p cr-g-1u s9+l9m6fp4ydnbg eboint in space to another. Make a comparisun- 9l+6 14 yrmdfe pbbsgg9c-on between the displacement and the distance traveled.

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) (No. in Group 2/27) Whole-Paper View eid: 783  R:W 144:54  Correct Percent: 73%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  When is the average velocity of an object equal to the instantaneoez8d6dfu9.8x/3ge d :vx w wsous velocity?

Correct Answer:    
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Mark Problem
3#
 
Single-Choice ( 1.0 marks) (No. in Group 3/27) Whole-Paper View eid: 784  R:W 107:87  Correct Percent: 55%  Difficulty: *****  
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  A new car manufacturer adv s+yz 4gemaj)e k;,o()+g 7hpp;wp nsrertises that their car can go "from zero to sixty in 8 s". This is a description of)n7 ;,kzmew4r+jsp pg()oapy;g hs+e

Correct Answer:    
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Mark Problem
4#
 
Single-Choice ( 1.0 marks) (No. in Group 4/27) Whole-Paper View eid: 785  R:W 123:61  Correct Percent: 67%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An object moving in the +x axis experiences an acceleratiox 6zh3q6l0uq scld- 7tn of $2.0 \; m/s^2$. This means the object is

Correct Answer:    
Mark Problem
5#
 
Single-Choice ( 1.0 marks) (No. in Group 5/27) Whole-Paper View eid: 787  R:W 86:87  Correct Percent: 50%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that a car traveling to the West v1.utkhu4r9: c +a,r iz2fax n(-x direction) begins to slow down as it approaches a t.ura u1h,tfiac :4k xnr+v9z2raffic light. Make a statement concerning its acceleration.

Correct Answer:    
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教师可以抽题组卷或一键复制本试卷，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
Mark Problem
6#
 
Single-Choice ( 1.0 marks) (No. in Group 6/27) Whole-Paper View eid: 788  R:W 136:53  Correct Percent: 72%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that an object is mo 0gxyr7b99 k4t qzmrfj9.tm:l;l:ws qving with a constant velocity. Make a statement con:m9gtkb t r0;lmfr9.yjq9 7qz4:wxlscerning its acceleration.

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789  R:W 95:101  Correct Percent: 48%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If the velocity of an object is z 6 k: o ;s:kt+ 3as-rnva6scw9vvyeh1lero, does it mean that the acceleration is zero? y1setr :lha;a96+ :-s6ov 3vsk nckvwSupport your answer with an example.

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) (No. in Group 8/27) Whole-Paper View eid: 790  R:W 102:118  Correct Percent: 46%  Difficulty: *****  
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  Can an object's velocity change direction when its :4op+0ayt r a+v/hbplacceleration is constant? Support your answer with an example.o0a l+ pp vtb:h+4/rya

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) (No. in Group 9/27) Whole-Paper View eid: 791  R:W 118:68  Correct Percent: 63%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose that an object is moving wii 2g od34qs:flfto/y;i yb*h*th constant acceleration. Make a statement concerning i* oy2f*gtiqbld3ifs:yo h 4;/ts motion with respect to time.

Correct Answer:    
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Mark Problem
10#
 
Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792  R:W 100:102  Correct Percent: 50%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Can an object have increasing speed whiluv 1ruc,k z :j1tq em-e4vohh :g(wa97e its acceleration is decreasing? Support your answer with an w qat 49vvuchjuee - :g17r,1(:om zhkexample.

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) (No. in Group 11/27) Whole-Paper View eid: 793  R:W 68:106  Correct Percent: 39%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Suppose a can, after an initis65pc p95vw 8rp/qoum al kick, moves up along a smooth hill of ice. Make a statement concero p u6qp5pm8v/s 9cw5rning its acceleration.

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794  R:W 116:83  Correct Percent: 58%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Under what condition is average velocity equal to the average of the objectf t(a.lnvr/ 4s's initial ans.rt/( 4lvf nad final velocity?

Correct Answer:    
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Mark Problem
13#
 
Single-Choice ( 1.0 marks) (No. in Group 13/27) Whole-Paper View eid: 795  R:W 152:43  Correct Percent: 78%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Objects A and B both )h2fq67sx jgny *f axe:+qc:pstart at rest. They both accelerate at the same rate. However, object A accelerates for twicxcxhfy*:n)e:a 6psq j2 7q +gfe the time as object B. What is the final speed of object A compared to that of object B?

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) (No. in Group 14/27) Whole-Paper View eid: 822  R:W 148:29  Correct Percent: 84%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An object moves 15.0 m north and then 11.0 m south. Find both the distance tu8 mc.p-jawn,e a/t 4sraveled and the magnitude of the displacement vectj-a 8sa./,ctmn wue4 por.

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823  R:W 106:59  Correct Percent: 64%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A boat can move at 30 km/h in still water. How long will it taep *xv: g kut48**oppkke to move 12 km upstream in a river flowing 6.0 km/*opp *kx*e :u8pgtk4v h?

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825  R:W 108:52  Correct Percent: 68%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  What must be your average speed in order to travei/be6lh6v6xq15ce 17fa vcg cl 350 km in 5.15 h?

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) (No. in Group 17/27) Whole-Paper View eid: 826  R:W 130:60  Correct Percent: 68%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What ifj(z r2itku, ngl4:b l+if 55vs the average speed of f:5 g4itiu n(,kv2 fb5llzjr+the runner in m/s?

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827  R:W 111:31  Correct Percent: 78%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A car travels 90 km/h. How long does it take for it to travel 400 kc0r aab6t2b2xi /:ihjm?

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) (No. in Group 19/27) Whole-Paper View eid: 829  R:W 121:70  Correct Percent: 63%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If you are driving 72 km/h along a straighzb2dm a6 ue1j2r+ta /wvs wp)1t road and you look to the side for 4.0 s, how far do you travel during this inattentive rm2wu+atjd6p1)b/e12z w a svperiod?

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) (No. in Group 20/27) Whole-Paper View eid: 830  R:W 78:148  Correct Percent: 35%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  If you run a complete loop aroun+,pr1 c uvl+up j3p0 t/ghwe0xd an outdoor track (400 m), in 100 s, your average velpjw013 + ug0,lupcxr+ptevh/ocity is

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831  R:W 91:93  Correct Percent: 49%  Difficulty: *****  
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  A polar bear starts at the Nc28w (sil.2b:lrwao borth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's averag(orb2alwsib: w l8c .2e speed?

Correct Answer:    
Mark Problem
22#
 
Single-Choice ( 1.0 marks) (No. in Group 22/27) Whole-Paper View eid: 832  R:W 94:100  Correct Percent: 48%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A polar bear starts at the North Pole. It trahxza7wc mo7n*a*agzo gr;b*e 81s04o vels 1.0 km south, then 1.0 km east,7s zc*goma 1zg*e;70awao*8bhxno4r then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

Correct Answer:    
Mark Problem
23#
 
Single-Choice ( 1.0 marks) (No. in Group 23/27) Whole-Paper View eid: 833  R:W 123:73  Correct Percent: 63%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  You are driving home on a weekend from school at 55 mi/h for 110 miles.npb+ na5m/am. ci6w l- It then starts to snow and you slow to 35 mi/h. You arriven5 .bcma6-/+plnwmi a home after driving 4 hours and 15 minutes. How far is your hometown from school?

Correct Answer:    
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Mark Problem
24#
 
Single-Choice ( 1.0 marks) (No. in Group 24/27) Whole-Paper View eid: 834  R:W 102:77  Correct Percent: 57%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A motorist travels 160 km at 80 km/h and 160 km at 100 kmdr +ps un1u+ggh),m9s3x r* qr/h. What is the average speer,nrp mhg+q)+rus g*ud19 x3sd of the motorist for this trip?

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835  R:W 130:48  Correct Percent: 73%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A motorist travels for 3.0 olya7za 83ip rfh*16yh at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the tripzh 6oi*frya1y p 8l3a7?

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) (No. in Group 26/27) Whole-Paper View eid: 836  R:W 119:65  Correct Percent: 65%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An airplane travels at sdglh;.2cyq 4 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. dgy;l4.2qsc h What is the average speed for the trip?

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) (No. in Group 27/27) Whole-Paper View eid: 837  R:W 105:66  Correct Percent: 61%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  In a 400-m relay race the anchorman (the person who runs the o o6fkw xp;b;/last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest l;b/x6f;owko p ead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

Correct Answer:    
Mark Problem
28#
 
Free-Response ( 1.0 marks) (No. in Group 1/7) Whole-Paper View eid: 10136  
试卷已过期，处于只读浏览模式，无法保存作答
第 2 题组 (共 7 题 7 分)
If one object has a greater speed than a second objm i/ndsgykn) j.; 6ov:ect, does the first necessarily have a grea .)i gvsm;6/nd k:yojnter acceleration? Explain, using examples.
Correct Answer:    

Mark Problem
29#
 
Free-Response ( 1.0 marks) (No. in Group 2/7) Whole-Paper View eid: 10137  
试卷已过期，处于只读浏览模式，无法保存作答
Compare the acceleration of a motorcycle that accelerates from*7*tr. wavq+o qvdp-u 80 km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest td- qvowuq*7 p+ r*v.tao 10 km/h in the same time.
Correct Answer:    
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Mark Problem
30#
 
Free-Response ( 1.0 marks) (No. in Group 3/7) Whole-Paper View eid: 10138  
试卷已过期，处于只读浏览模式，无法保存作答
Can an object have a northward velocity and a southward accelm lg8jr,wo6-uq:n z d5eration? Explain.
Correct Answer:    

Mark Problem
31#
 
Free-Response ( 1.0 marks) (No. in Group 4/7) Whole-Paper View eid: 10139  
试卷已过期，处于只读浏览模式，无法保存作答
Can the velocity of a4ty -o.7dgu txf1o-w q/szr;qn object be negative when its accel- eration is positive? What about vice/ox7wq4o qt.zy-;t fgdru1s- versa? If yes, give examples in each case.
Correct Answer:    

Mark Problem
32#
 
Free-Response ( 1.0 marks) (No. in Group 5/7) Whole-Paper View eid: 10140  
试卷已过期，处于只读浏览模式，无法保存作答
Give an example where both the velocity and acckxvzxe3x2zrecwe* *06 7 l8w j 9ylp5celeration are negative.
Correct Answer:    

Mark Problem
33#
 
Free-Response ( 1.0 marks) (No. in Group 6/7) Whole-Paper View eid: 10141  
试卷已过期，处于只读浏览模式，无法保存作答
Can an object be increasing in spee ,4k.5gltywcqz * dfn3d as its acceleration decreases? If so, give an exlg3kcfq4t z5.w y*,n dample. If not, explain.
Correct Answer:    

Mark Problem
34#
 
Free-Response ( 1.0 marks) (No. in Group 7/7) Whole-Paper View eid: 10142  
试卷已过期，处于只读浏览模式，无法保存作答
Two cars emerge side by side from a tunnel. Car A is traveling with a speed r+,up7t1 tuv0ee s rw6of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed of 40 km/h and has an acceleration of 60 km/h/min. Which car is passing the other6 p71rwet+tr0s, uev u as they come out of the tunnel? Explain your reasoning.
Correct Answer:    

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