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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 fr04ei*dxwgufy9 a*(j uom one point in space to another. Make a comparif * u(ueg904w*idxajyson 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 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 the instantane6yavwwh06i*ayjaw g +) skq2- ous 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 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 adverti5d0 yflh. 8kbo3/no duses that their car can go "from zero to sixty in 8 s". This is a f 5d/nbyo8d.0l3ukho 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: *****  
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  An object moving in the +x axis experiences an acceleration ob dq3r -im+)bpf $2.0 \; m/s^2$. 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 104:87  Correct Percent: 54%  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 (-x direction)q2) ip/:j h3gmcivnl2 begins to slow down as it approaches a traffic light. Ma/2)nl :ci hpi m2vjg3qke a statement concerning its acceleration.

Correct Answer:    
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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:p gx6*rfiw+ h*g- afw with a constant velocity. Make a statement concerning its accelgh6 xpar w-g *+wf:*fieration.

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: *****  
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 zero, does it mean that the acceleration is zerbb5c0w / io(dty ga77ro? Support your a o wi gabd7bt7cr/y(50nswer 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(kxw (jauw1amxz* (k/ when its acceleration is constant? Support your answera(kw(( mx1xa k*uz/jw 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 moving with constant acc3qjw3 u xjsz9 ds 7lrlm.v 7+(:x7oiyeeleration. Make a statement concerninzr7 s uqd ij37:+oewx lsm(v9. 3ljyx7g its 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 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 accelerati11uu x- cibt3eon is decreasing? Support your ab xi3 -tec1u1unswer 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: *****  
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  Suppose a can, after 7;em 42pplb wa9-dhv hg) k9zgan initial kick, moves up along a smooth hill of ice. Makemghda ge2 9k ;phl)pwbzv-974 a statement concerning its acceleration.

Correct Answer:    
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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 the average of the object's ina*l vfy/:6 qlkitiayqa lk*vl:f 6/l and 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 accelerate at the samz o vk1ljet44lf8 ;e.ge rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to jlog4eez.;f 41v8 ktlthat 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 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 t*-,b pywo/f 8bzy0lv rhen 11.0 m south. Find both the distance traveled and the magnitude of the dil- z *py8rvbb,/o wy0fsplacement 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 12 km w1ytxetvoic/(r8.hp, t oi:,7a bmh 5ax r/9r up5, 7r(iat98.tc1,xyamr ehwp/oiv:/ rox bhtstream in a river 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 to ekw(gn( k(rcdm3u91ravel 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 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 (appr8w nrpekok3-t0stgr49l:vj(oximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner i4e8ks9(0g3tr tjwpv-r :l konn 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 ta5nzn8 wpd v)3t2 i)acfke for it to travel 400 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 lf o6+xb1wvvygc )o s*f4w9;ucook to the side for 4.0 s, how far do you travel during this inattentive perisv v;wg6bwy o*41fcc 9o+ fux)od?

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, youryb gwx rx1/nc5yw,pdlk -h4 :3 average vy4k 3rcdlxp,ygbw -x1w: h/n5elocity 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: *****  
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  A polar bear starts at the Nort 02kbro 3vzl 3uuaho;4h 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. Whatu ak2ro3h uo40 3z;bvl 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 1.0 km south, then 1.-x s ce3 in6qm:svbs//0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This t c:mnq-3e6s //bsxivsrip takes 45 min. What was the bear's average velocity?

Correct Answer:    
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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 a weeken48q-cnx 5f6 ik vhdi1)qoh0m nd from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrivh6o0 fxdc84)5m1 ivn-khi qnqe 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 80 kq u9p*3bi gr4*bxziz0m/h and 160 km at 100 km/h. What is the average z4qxir g*u ipbz*9b0 3speed 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 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 h at 80 km/h and 2.0 h at 10+.ho lz3h4ydj 0 km/h. What is her average speeh jlo+y4h.z d3d 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 30*pf1o stpx4l5v:m4 el0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average stes p14lvml*5:f op4x peed 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 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 (tgkb-fm .u km5:he 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 f :-mkb .kgu5m10.1 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 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 speed101 5lr mmvtuue28 ani than a second object, does the first necessarily have aine812u50 1m luartmv greater acceleration? Explain, using examples.
Correct Answer:    
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Mark Problem
29#
 
Free-Response ( 1.0 marks) (No. in Group 2/7) Whole-Paper View eid: 10137  
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Compare the acceleration of a motorcycle that accelerates from 8j g jb1j t*vxdy8)-g1pr;t(slao+ y g20 km/h to 90 km/h with the acceleration of a bicycle t1)gjxbsg;-l8 y*ryd jg p( votj+1a2that accelerates from rest to 10 km/h 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 velocitwts4 gdf89ff ql(pt*e *k*6m vy and a southward acceleration? 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 obje9je - p3xmk+brct be negative when its accel- eration is positive? What abouk3bje-+x pr m9t vice 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 acceleration are n+i9 dij zt 54r,x h(e;ykoy5:lxak1nregative.
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 spl,;ntix8jbihv h.k+ytza*0 cwdv 8/z7 h , r:qeed as its acceleration decreases? If so, give an example. v.7n+b,0thh , c*zah; d yki8 lzq8/riwt xv:jIf 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 spqokm1:x ow.et* vv4e 7eed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed of 40 km/h and has an accelee1vx.4ow7 t * v:qkemoration 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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