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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 126:83  Correct Percent: 60%  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 point in space to another. Make a ceu (u .dtjf/qesnb0 , ue159nmomparison between the displacement and the distance menj q(u b0 uf,9.1see/ud5 nttraveled.

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) (No. in Group 2/27) Whole-Paper View eid: 783  R:W 166:56  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 equalk(-s3 hkonx3s 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 128:91  Correct Percent: 58%  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 theigq++bc0 idfy7r car can go "from zero to sixty in 8y7cf b0gqi ++d s". 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 146:63  Correct Percent: 70%  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 eg, 6k/)ho 8gdaydoz8pwf +cj 7xperiences an acceleration 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 109:87  Correct Percent: 56%  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) begut;a3i f8f1*i 5iv mrqins to slow down as it approaches a traffic light. Make a1q3auif t;iimv*fr 85 statement concerning its acceleration.

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) (No. in Group 6/27) Whole-Paper View eid: 788  R:W 159:53  Correct Percent: 75%  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 veloc p.sn0g j;ri7gs*r4c mity. Make a statement concerning its accelerationg 7jsr; 4pgrcs.0in*m.

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789  R:W 111:114  Correct Percent: 49%  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, doegr56., a l m z7pcbi ;w/wcy(udy,ing)s it mean that the acceleration is zero? Suppy ,, nuw;5rab/z6 .gpdccm (iyiwl7)g ort 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 124:122  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's velocity cg o6zz4l9rn2, i* igsvhange direction when its acceleration is constant? Support your answer with an ex * 64oizs2lgn,gr vz9iample.

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) (No. in Group 9/27) Whole-Paper View eid: 791  R:W 139:73  Correct Percent: 66%  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 97 droxcyhy 6,2 tz2vlwith constant acceleration. Make a statement concerning its motion with respect to x rl,ch6z29t2yd oyv7 time.

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792  R:W 118:109  Correct Percent: 52%  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 whiwj4jo2c i+d*i kygy;m9a s :xb9in*wqst g524le its acceleration is decreasing? Support your answer with an example.+tsnojd4ggq 4 w9*ik;m:aix2 5 2wysj 9c b*iy

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) (No. in Group 11/27) Whole-Paper View eid: 793  R:W 73:106  Correct Percent: 41%  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 along a smoot lrh)g +d mq9e0c8 o1*4rsjhzoh hill of ice. Make a statement concerning its acce ogre1s* orm)4lh08cz+ 9qhd jleration.

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794  R:W 134:91  Correct Percent: 60%  Difficulty: *****  
试卷已过期，处于只读浏览模式，无法保存作答
  Under what condition is averaf73)xwkk sq4:q zo o5-f fl6wdge velocity equal to the average of the object's initiff7x: ozkk46w) s3olw5q-d fqal 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 175:44  Correct Percent: 80%  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 same rat z0. y* -jcd8x qk28;-f(cikxlrttjpbe. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of *ftry28(- l pkd.b;czi-0x j 8kxctjqobject B?

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) (No. in Group 14/27) Whole-Paper View eid: 822  R:W 170:30  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(ifm 6hgx2c8bu*wfx 9 c:plx. then 11.0 m south. Find both the distance traveled and the magnitude of the displacement 8xiumw2f. cfgp bhxc* x9:6(lvector.

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823  R:W 129:62  Correct Percent: 68%  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 seh2kj,e:doq u4) fhy,till water. How long will it take to move 12 km upstream in a river flowing djoh ,e qfuk:2 e4,y)h6.0 km/h?

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825  R:W 129:54  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 tr1o1nuwz6 ldu7ix e:1j avel 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 153:62  Correct Percent: 71%  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 (approximat5wh 5t0 - +;6afqcuc h/tal9k;ftrzdjely 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in tacw 0t5r6au;9zq f+tdflhk;ch5 -j/m/s?

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827  R:W 133:32  Correct Percent: 81%  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 zeow n7a lk6o3yje759d:udn6take 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 143:73  Correct Percent: 66%  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 rh+z:),n -0 *n qr7nylxetlhm6ey dt4goad and you look to the side for 4.0 s, how4+:, ht6h 7nglydrq ml0) x-neye*tzn 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 97:158  Correct Percent: 38%  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)p8b* +vz;jdv(t g7 opg, in 100 s, your averageg*+v o8bgt;7p z pdj(v velocity is

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831  R:W 114:94  Correct Percent: 55%  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 trave3rm/ 3uwdi, :gdr-nycls 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km w:dcum wdy 3g3-/r,rniest to 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 116:104  Correct Percent: 53%  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 )6c tg x+co(x0,8 nfki jgk(g87 sbvkxtravels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.x c +0nk76 gok)ig,(gfxk(8t jx8cvbs 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 145:75  Correct Percent: 66%  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. It tl+h 6(* 6cala n;:uv1xr ,ad /kjmtsiahen starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from schoolvas rax ,d*m (a/ l66l:aijntc;+1uhk ?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) (No. in Group 24/27) Whole-Paper View eid: 834  R:W 124:82  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 160 km at 100 km/h. What is the aver+/-t) qgx/;mar fe,pvgk.a 2bhxdvb+ age speed of the motorist fo,e+a2rvqvdf tkx/g/;bhba)m+g xp . -r this trip?

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835  R:W 150:50  Correct Percent: 75%  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 100 km/h. What is her aveb spabk j4rn.a9+9 :oerage aprena+: sk.9b4 j9b ospeed 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 140:67  Correct Percent: 68%  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 n;9:inf h/qkevorth for 750 miles. What is t9 enifk; q:/hvhe 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 123:72  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 thep:qptgv/ i:)sgo)s 1 k anchorman (the person who runs the last 100 m) for team A :/1g: qot) skvsigp)pcan 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 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 necesszq 9/x+6rj(-ujaveb e arily have a greater acceleration? Explain, usin +zeqj(e9 ju6 brxv-a/g 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 80 km/h *zpww;1l sx. up5k5g ksyq 2d4to 90 km/h with the acceleration of a bicycle that accelerates from rest tow5dxzq sp2u p*1kgk54 wys.;l 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 southwsr;-lhldo/qu . o60om (zf4th ard 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 object bej fjo7toci0k)vay4 3gex3u 9ww,c3. w(ely2f negative when its accel- eration is positive? What about vice versa? If yes, give examples in each ckol(9g i0fw,a3f)wejyy7c 3.t2 vj u4xew3 coase.
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 ts f n xb.jhk73o3fu0hx;r11aduaja41he velocity and acceleration 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 speed as its acceleration decrea1rbho2j 7pn :qses? If so, give an example. If rno 2:qbph71 jnot, 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.) /9 lzu+xgbx 6udtpv with a speed 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 acceleration of 60 km/h/min. Which car is passing the other as they cov9l)d bxxuu6z+/gt.p me out of the tunnel? Explain your reasoning.
Correct Answer:    

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