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PRACTICE：Science 10 April 17 in-class Practice

  Author: cwphysics    Total: 34 Marks  Marks Earned: _____________

User Name: No Login  Start Time: 25/04/17 08:15 End Time: this month 25 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 fr.w s;l h6qd8cpom one point in space to another. Make a comparison between the displacement and thepq;s6l.h cd8w 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 velociix,6f g(;qlyvol3 o i:ty of an object equal to 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 s wa3lb+/-4f/ opekgce3me +jthat their car can go "from zero to sixty in 8 s". This is a description 3l aew /+gejs+p kc-foe4/m3bof

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 experiences an accelerat/ i fujy,q5j/mkomk .(ion 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 traveluac /o g.zdy c6hq/+m qqg4x1 spn/9 4yya3b2ning to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning cqsm. ny/4a/ 4yxcpzgqay63/2o9uqnd 1+hgbits 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 0k(+2weq ,taf ajwf0d a statement concerning its(w edj2ktfa0fwa +0q , 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: *****  
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 isukito c7icb7uxc,a5 x40 a e;) zero, does it mean that the acceleration is zero? ko ;c c0u)7i,iu5xtb aa e4xc7Support 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 0 hh bqyy6f0-cdirection when its acceleration is constant? Support your hqyhyc 0 -06fbanswer 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 acceleration. Make a sta j2,-ddan :qoa;4 f 9s; 4t6 mluxri71eftlnkltement concerning its motodeu:6 i ks aln -fq,ljr4d mltx;9271fa n4;tion with respect to 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 increh i7/q(npo1 n8cs .jzqasing speed while its acceleration is decreasing? Support youi7jozhq8 1qs pc.n(n/r 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: *****  
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, moves up bx x9 n0ouiwg/i;.yu4along a smooth hill of ice. Make a statement cou 0gw /o4;xnyi9.x ibuncerning its acceleration.

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 the average of the obj viujson8v :p2xesej*as j o0 -(e 36u1ef5(taect's initia2 a0e1 tovs-x8 (* juveeaepn3:sj(i j o56sful 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 stlhzw:;h8- 8+w pfnak sart at rest. They both accelerate at the same rate. However, object A accelerates fln;f-wwa :zp 88 hh+ksor twice 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 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 a8,bo5mdu..e gutw9zt 18 vw mcvqh77pnd then 11.0 m south. Find both the distance traveled and the magnitude of the displacement h c7q ,7u9pzgou8 ve ww 85b.tvmmd1.tvector.

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 a9-a);gi imfokm/h in still water. How long will it take to move 12 km upstream in a riviom) a;agif9 -er 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 travy0ivtg*ea ku;t+d 111 sda.hgel 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 (approximately 42.0 km) in 2 hours and 57 mv30cywr jrpn iuv9s4b1p.j96in. What is thyp 90.r4j6vbpvn9jusr iw1 c3e average speed 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 itket19pzg vz6)y17vhgy k3i3 h 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 stru vpixi2;0e 0haight road and you look to the side for 4.0 s, how far do you travel durv02;hi ue pi0xing 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, yoq:g ;( , ylmbm1;uaieiur average veloaymg ,u m l:i(ibe;q1;city 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. It trahiw49r(4;, xaoj jmkqd du-4ivels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point4 ij -q w9k dmiu4x,d;hrao4j(. 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 1.0 km south, thebwv g-6pciacc/ ,d.h ))(puqqn 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 b qacdvpg()-.w u)/ci6pc bhq, ear'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 weekgj2 7bpw 0+u r)n7pggxend from school at 55 mi/h for 110 miles. 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 hogpgn+0j)gu p x772r wbmetown 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 km/h and 16u a 27fyi+u2bz0 km at 100 km/h. What is the average speed o7 +buf22iay uzf 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 2.0ynz9hlf c/bv:lm.6( ff5u6 p g h at 100 km/h. What is her average speed fo(:56ym.u fgvc96 pl/hbffnz lr 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 macpolo s scb s)/5,6zt .e,u.li/h north for 750 mil otc op,sue65c, l..s/slazb )es. 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 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 (the person who runs the l1:( gmmyfp+:crtsa , fast 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 rmpygsat( f+:,cm1f: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 objfaemgqodzg.gx- -31 q3c*j l(ect, does the first necessarily g*qca-qljzgge.d1x of m33(- have a greater 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 moth3 mvyl)+od4+ )admqs2oo6 lporcycle that accelerates from 80 km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest to 10 km/h in the same tio2yph6m)ls)3amv+d l4 +oo qdme.
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 no*2nodtm)a 0t uxhj4r+rthward velocity 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 obej 1x/yuhzl c5iu*jlvua )8(: ject be negative when its accel- eration is positive? What about vice versa? If yes, give x1huc i/*a ( ujulze5)8ljy:v 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 negative. uuz1b )0g0hri5cmpp0
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 increa u3/os )ng-qr*c vin.lsing in speed as its acceleration decreases? If so, give a3/ v r*)gu-nso cn.liqn 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 traveling with a speed r ibk9 uuox(-5of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed ofuuox (i b5k-r9 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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