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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 121:83  Correct Percent: 59%  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 oepj ot0) sm99x (vawy3ne point in space to another. Make a comparison between the 9te0 asm39(vojwy)x pdisplacement 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 161:55  Correct Percent: 75%  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(*.weutx t uy, the instantaneous velocity?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) (No. in Group 3/27) Whole-Paper View eid: 784  R:W 123:91  Correct Percent: 57%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  A new car manufacturer advertises that their car can gov cm)g;kq,h-b 6xb(sgs3hj/jvc 95r g "from zero to sixty in 8 s".xcbr/cb3vgm h 5,j (g-)v9;hkgs6qjs This is a description of

Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) (No. in Group 4/27) Whole-Paper View eid: 785  R:W 141:63  Correct Percent: 69%  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 experienc,khvk*ut k *y+- /are6+oi elles an acceleration of $2.0 \; m/s^2$. This means the object is

Correct Answer:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) (No. in Group 5/27) Whole-Paper View eid: 787  R:W 104:87  Correct Percent: 54%  Difficulty: *****  
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  Suppose that a car traveling to the West (rn y. rhj. ne5 k+6eptp6;j rqvrp01o7-x direction) begins to slow down as it approachkhv ptrynrq0+j 661r 7jrpnoe..5; pe es a traffic 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 154:53  Correct Percent: 74%  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 with a constant zgpi(ip eq:o 6x-voyuf 3+*4ovelocity. Make a statement concerning ipixy -i qepv3o o*( 46uz+:ofgts acceleration.

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789  R:W 106:114  Correct Percent: 48%  Difficulty: *****  
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  If the velocity of an objegs 4mnc:2x:gf .r -.ssg ab(isct is zero, does it mean that the acceleration is zero? Support your ans. gg nmsiba-sfsx:(r2g.4cs: wer 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 119:122  Correct Percent: 49%  Difficulty: *****  
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  Can an object's velocity change direction when its acceletug7m1ijtr 89ration is constant? Support your antj9 tri u78m1gswer with an example.

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) (No. in Group 9/27) Whole-Paper View eid: 791  R:W 134:73  Correct Percent: 65%  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 movi35xux2tb icb0ng with constant acceleration. Make a statement concerning its motion with respect to 203bx5cxibut time.

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792  R:W 114:108  Correct Percent: 51%  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 while its acceleration is decreasin3-waulg5 bq9yg? Support your ans-3g 5ub 9lwyaqwer with an example.

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 initial kick, m .. :9sfrppmdqoves up along a smooth hill of ice. Make a statement concerning its acceleration .d9pmfs.pr q:.

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794  R:W 129:91  Correct Percent: 59%  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 ts0;3;1a89kk e1 mortvgr aeirhe average of the object's initial a;ge t30v1 ;a ra19krk8roeimsnd final velocity?

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) (No. in Group 13/27) Whole-Paper View eid: 795  R:W 170:44  Correct Percent: 79%  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 start at rest. They both a.6--vtd6l8n -hfro azo usfa(ccelerate at the same rate. However, object A accelerates for twice t66rutvnfa8 a- o .o(dl- s-hzfhe time as object B. What is the final speed of object A compared to that of object B?

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) (No. in Group 14/27) Whole-Paper View eid: 822  R:W 165:30  Correct Percent: 85%  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. Ff7ptm32nn- b+ssn8 ;hq 3zg cgk;r7 lyind both the distance traveled and the magnin;y8p sf7zl -3hst nq+gn23 7rkg;mcbtude of the displacement vector.

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823  R:W 124:62  Correct Percent: 67%  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 take to move kkq -)/p4+g;);bkriau ti.t8r mum ai12 km upstream in a r8tagmtiq+ i.p;4 rum-i b)ku;)r/akk iver flowing 6.0 km/h?

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825  R:W 124:54  Correct Percent: 70%  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 travel 350 km in 5 48a+hlrcoz-j e2jh k+.15 h?

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) (No. in Group 17/27) Whole-Paper View eid: 826  R:W 148:62  Correct Percent: 70%  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 mind5,rsmuys. ep6 ,as-s. What is the average speede,6d.a, ss5psru- ysm of the runner in m/s?

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827  R:W 128:32  Correct Percent: 80%  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 e0m6 kn)ycp3o400 km?

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) (No. in Group 19/27) Whole-Paper View eid: 829  R:W 138:73  Correct Percent: 65%  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 straight road and you look to rfh9npjf.6+ f the side for 4.0 s, .f9nph f+6frjhow far do you travel during this inattentive period?

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) (No. in Group 20/27) Whole-Paper View eid: 830  R:W 92:157  Correct Percent: 37%  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 around an outdoor track (400 m), in 100 s, your av+8 ;j7wunebuherage velo8wn jeu+;bu 7hcity is

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831  R:W 109:94  Correct Percent: 54%  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. Ig eopjpb9./dxa /3 y0bn ujsf,j:9bn-t travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to b3oy.:j u,b/g denxjbf0ap-j sn 99p/return to its starting point. This trip takes 45 min. What was the bear's average speed?

Correct Answer:    
Mark Problem
22#
 
Single-Choice ( 1.0 marks) (No. in Group 22/27) Whole-Paper View eid: 832  R:W 111:103  Correct Percent: 52%  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 travels m0p ykv1dxlfu*ox2kcsd 1/7. 1.0 km south, then 1.0 km east, th07 2vxm lkf1*.su 1ko/dcxpdyen 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 140:75  Correct Percent: 65%  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 azd ((,mw*0 tpzq ee ;o,decz.n weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You ar0(t.ez, dn cem;zwzoep, *q(drive home after driving 4 hours and 15 minutes. How far is your hometown from school?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) (No. in Group 24/27) Whole-Paper View eid: 834  R:W 119:80  Correct Percent: 60%  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 8d4wtx;/ljotj0mqdb)b h d; y8;g 1g )n0 km/h and 160 km at 100 km/h. What is the average t)j;0 ;;4)dogj hw8lgn1bbyxtmqdd / speed of the motorist for this trip?

Correct Answer:    
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Mark Problem
25#
 
Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835  R:W 145:50  Correct Percent: 74%  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 h04svuj4w b7oi at 80 km/h and 2.0 h at 100 km/h. What is her average s0uo siwjb 7v44peed for the trip?

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) (No. in Group 26/27) Whole-Paper View eid: 836  R:W 135:67  Correct Percent: 67%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h n4w ,v+5 ks/klcn b.t mhc+tun6bt5 y8dorth for 750 miles. What is the average speed for tu t5d .vn5s tk/64w+bh,tc+c8 nmlykb he trip?

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) (No. in Group 27/27) Whole-Paper View eid: 837  R:W 120:70  Correct Percent: 63%  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 (a 0zqh)a,4pj k.u 4 jqo;o6jbhthe person who runs the 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 lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A r,oj ahb4juqq)zh0 aj4 p;ko6.unner not lose the race?

Correct Answer:    
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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 obj.v-r( ypd 2sdk eo2x+e:b:tzuect, does the first necessarily have a greater acceleration? Explain, using exampr :2s.xd-e z(ob2k+de yu :vptles.
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
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 80 km/h to 90ox7x,fa( l*ko km/h with the acceleration of a bicycle that accelerates from rest to 10 km/ka f,x7olx(* oh in the same time.
Correct Answer:    

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 acc+t qs*cnfxjp/ 06.osbeleration? 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 an object be negative when its accel- eration is positiv6ytxn l24h)m xq7/ tpse? What about vice versa? If yes, give exat ym/hx )2n txpq7ls46mples 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 acceleration o*az.0wys1 cd are negative.
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
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 inc3ynx x7o efp57wn43e zreasing in speed as its acceleration decreases? If so, give aneen3yx 34757nopzw fx example. 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 trzl 72 kjo3enux a().yjaveling with a speed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed of 40 n ) eukxy3.jl(2a o7jzkm/h and has an acceleration of 60 km/h/min. Which car is passing the other as they come out of the tunnel? Explain your reasoning.
Correct Answer:    

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