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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 traukbkt/ 0xwtkdm(6 -(y vels from one point in space to another. Make a comparison between the dk dt6y kwtm/b-u(xk(0isplacement 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 instantanr )g-vlkp5u9)0h2q isw5a(.wv c lpoleous 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: *****  
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  A new car manufacturer advertises that their car can 1: )).bzl,au 8yneeh duudav .go "from zero to sixty in 8 s". Thnuaaz y,dv )e.ld 1u8h:.bue)is 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: *****  
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  An object moving in the +x axis experiences an ko((skq7n8db)n :z( b dmpl /cacceleration 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 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) begins to slow dl p4ojfynn)6+own as it approaches a traffic light. Make a statement concerning o6j yn)nf+4 plits acceleration.

Correct Answer:    
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 velocity. Make a statement con7 7x5eg pr2wk7 zl0(ymm(jxt wcerning its accelerat 0ytepl7m(xkzm2xjrw5g 7w 7( ion.

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 obje 2lik. j8gso f-q,bbt+ct is zero, does it mean that the acceleration is zero? Supposq 2,ft .olik-bg 8+jbrt 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 119:122  Correct Percent: 49%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Can an object's velocity change direction when its accelera13a.2ucey 7:qblf sp vtion is constant? Support yo:sfq. 3ye cpl7b1uv2aur answer with an example.

Correct Answer:    
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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: *****  
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  Suppose that an object is moving with consxfc6ygf+826vj+l* rqhk v/h stant acceleration. Make a statement concerning its motion with respect tgr2jflhq/ 6x f +kv+8ychv*s6o 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 sfp)y64j mx kj+peed while its acceleration is decreasing? Support y4yk jmfjxp6 +)our answer 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, aftera qd1 e:eq ,+prygnat v)0)q(+ock)yt an initial kick, moves up along a smooth hill of ice. Make a statement concerning its accelerato)g ey(cr0taq+ qynk) ta1:qp e,+v)dion.

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 *7 h,p2*dx;vbly xnro rnu (h6equal to the average of the object's initial an,2r7* hxo6lrd b nv*y ;nhx(upd 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 bo8nq mphy (5+bcansq z6cbfi;4fu117 z th accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the1cin(q;p5z1mnf +c4f7z 8sha b6u byq 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 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. Find both the distam aowgpe,h ; as+o/nhu+ f5rl0x,w w-1nce traveled and the magnitude of the displacemenf ww/upaloga nmh, rh s,xo 10e5w-;++t 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+1+qo zn 113wwgtx zdewt t*1m still water. How long will it take to move 12 km upstream in a r1qz ote t1twnw+1zgdw13x+*miver flowing 6.0 km/h?

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
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 kmumvuun 1y) obb0-/ wn 8zlp1b)doth+6 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: *****  
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  A runner ran the marathon (approximately 42.0 km) in 2 hours and 5 83jg1n c pa0on.u;iuu7 min. What is the average speed of the runn8.u 0a;up i13 ugjcnoner 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 lonfbi7w 2 z8l7 k*sp/daig does it take 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 look to the sims5w8ei 8n s1rj*wk6ide for 4.0 s, how far do you trav semk8sr1i 6 njw*58iwel 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 uq0om: 2b*nqsaverage velocitubo02*:sm qnqy 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 N o,c3behgs:w vkd733g orth Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to r s3g 7:chowve,d33 bgketurn 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 1.f)glevb1 m3 pau 9dy:j+6 g1het/ pnpi;8v6sm0 km south, then 1.0 km east, tt f8gm+ p61 ;evgvlesm a)/d ubjy3 ph1p9i6:nhen 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 a weekend from school at 55 mi/h for 110 miles. elp70vbw8 8bepp ecef04* )hi It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your home0bp*e0e7c vp h8l8ief w)ep b4town 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: *****  
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  A motorist travels 160y 6 j7grrgx5d5nv+*eb km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for thirg5+*x jv5nb7yge r6d s 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 hr*kr s+wlrlb 6m2wg yrq1(i+ vyr;*7m at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the triwq v* r*(glkmry7 r miw21sl;+ +b6rryp?

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: *****  
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  An airplane travels at 300 mi/h south for 2.00 h and then at 250/iqz.pu uhk:, mi/h north for 750 miles. What is the averagezi p u/u,:qkh. speed for the trip?

Correct Answer:    
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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: *****  
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  In a 400-m relay race the anchorman (the +q8): ezqb f0rxn)hu -j njh4lperson 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-4nj:hzq)8 ruq0 +f )hlnbexj 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 object, does the first :qj cibp/0 1cdt8de/ o i2*ygfnecessarily have a greajoyipf2i/t c b 0/d: qd*cge18ter 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 motorc-. gbx7exxsw/ u1 zto6ycle that accelerates from 80 km/h to 90 km/h with the acceleration of a b6 go w7/bxsz1xtu- .exicycle that 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 velocity and a southward accap a0rtg+-y +xeleration? 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- erati di:5lc) au+wfon is positive? Wha5 a):dfi lwuc+t about vice versa? If yes, give examples in each case.
Correct Answer:    
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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 negatiyaz06x9zaj t- ve.
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 increasf, b2nxk-puurd*n5 *sing in speed as its acceleration decreases? If so, give akx, pfn* -bu u2drsn*5n 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 et r. vgjcw35- j5x4yais traveling with a speed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed wyevjrxga5 3cj 5t-4. of 40 km/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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