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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

1#

Single-Choice ( 1.0 marks) (No. in Group 1/27) Whole-Paper View eid: 782 R:W 152:86 Correct Percent: 64% Difficulty: *****

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第 1 题组 (共 27 题 27 分)

Suppose that an object 58d95 x ht owlnmz9ns38l tr;ztravels from one point in space to another. Make a comparison between thrx m s;d3n8wtz8 l9z5lt9oh5ne displacement and the distance traveled.

A. The displacement is either greater than or equal to the distance traveled.

B. The displacement is always equal to the distance traveled.

C. The displacement is either less than or equal to the distance traveled.

D. The displacement can be either greater than, smaller than, or equal to the distance traveled.

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2#

Single-Choice ( 1.0 marks) (No. in Group 2/27) Whole-Paper View eid: 783 R:W 191:57 Correct Percent: 77% Difficulty: *****

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When is the average velocity of an object equal:jve2 gf g 123kgf)kyl to the instantaneous velocity?

A. always

B. never

C. only when the velocity is constant

D. only when the velocity is increasing at a constant rate

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3#

Single-Choice ( 1.0 marks) (No. in Group 3/27) Whole-Paper View eid: 784 R:W 151:97 Correct Percent: 61% Difficulty: *****

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A new car manufacturer advertises that the uf y,kcbtu7j3;:bh( sir car can go "from zero to sixty in 8 s". This is a description buu,; bks c: (yfh3tj7of

A. average speed.

B. instantaneous speed.

C. average acceleration.

D. instantaneous acceleration.

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4#

Single-Choice ( 1.0 marks) (No. in Group 4/27) Whole-Paper View eid: 785 R:W 170:66 Correct Percent: 72% Difficulty: *****

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An object moving in the +x axis experieqyzpt wwl6 : 6.*)udtbnces an acceleration of $2.0 \; m/s^2$. This means the object is

A. traveling at 2.0 m in every second.

B. traveling at 2.0 m/s in every second.

C. changing its velocity by 2.0 m/s.

D. increasing its velocity by 2.0 m/s in every second.

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5#

Single-Choice ( 1.0 marks) (No. in Group 5/27) Whole-Paper View eid: 787 R:W 131:92 Correct Percent: 59% Difficulty: *****

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Suppose that a car traveling to the West (-x dglpiot m,/u);h5xwh 2irection) begins to slow down as it approaches a traffic light. Make a s;/x)i2p 5h tlwu,mohgtatement concerning its acceleration.

A. The car is decelerating, and its acceleration is positive.

B. The car is decelerating, and its acceleration is negative.

C. The acceleration is zero.

D. A statement cannot be made using the information given.

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6#

Single-Choice ( 1.0 marks) (No. in Group 6/27) Whole-Paper View eid: 788 R:W 184:53 Correct Percent: 78% Difficulty: *****

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Suppose that an object is moving with a constant velocity. sm(i0vzs3.xr Make a statement concerning its accelerations xsm3i0(r .vz.

A. The acceleration must be constantly increasing.

B. The acceleration must be constantly decreasing.

C. The acceleration must be a constant non-zero value.

D. The acceleration must be equal to zero.

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7#

Single-Choice ( 1.0 marks) (No. in Group 7/27) Whole-Paper View eid: 789 R:W 133:126 Correct Percent: 51% Difficulty: *****

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If the velocity of an object is zero, does it meanj iz-9bj1nhst o nxzn0k-s2,*b kn s,9 that the acceleration is zero? Support your answerz, 90 o1n9snkh ,2xt nsbsk j*b-j-zni with an example.

A. no, and an example would be an object starting from rest

B. no, and an example would be an object coming to a stop

C. yes, because of the way in which velocity is defined

D. yes, because of the way in which acceleration is defined

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8#

Single-Choice ( 1.0 marks) (No. in Group 8/27) Whole-Paper View eid: 790 R:W 147:127 Correct Percent: 54% Difficulty: *****

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Can an object's velocity change direction when its acceleration is constant? 0/ 9z f/iy- +vd ghyrin,ejgx)Support your answ df iv-0/x g)g,yhz j9en/yi+rer with an example.

A. No, this is not possible because it is always speeding up.

B. No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.

C. Yes, this is possible, and a rock thrown straight up is an example.

D. Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example.

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9#

Single-Choice ( 1.0 marks) (No. in Group 9/27) Whole-Paper View eid: 791 R:W 163:77 Correct Percent: 68% Difficulty: *****

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Suppose that an object is movingrd+qr+a9ac/ w)nn 8bo 0hp sz/ with constant acceleration. Make a statement concewd zn/hsn+rq/c 9pbo)+r08a arning its motion with respect to time.

A. In equal times its speed increases by equal amounts.

B. In equal times its velocity changes by equal amounts.

C. In equal times it moves equal distances.

D. A statement cannot be made using the information given.

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10#

Single-Choice ( 1.0 marks) (No. in Group 10/27) Whole-Paper View eid: 792 R:W 141:113 Correct Percent: 56% Difficulty: *****

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Can an object have increas;teq*122nx/;fukb jx3cn xi sing speed while its acceleration is decreasing? Support yournj22ic *ex3ufknx;q 1/sxtb ; answer with an example.

A. No, this is impossible because of the way in which acceleration is defined.

B. No, because if acceleration is decreasing the object will be slowing down.

C. Yes, and an example would be an object falling in the absence of air friction.

D. Yes, and an example would be an object released from rest in the presence of air friction.

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11#

Single-Choice ( 1.0 marks) (No. in Group 11/27) Whole-Paper View eid: 793 R:W 92:112 Correct Percent: 45% Difficulty: *****

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Suppose a can, after an initial kirb t3nikx ;xtc;m38 ,wck, moves up along a smooth hill of ice. Make a statement tbc i38tkxwm;n x,;r3concerning its acceleration.

A. It will travel at constant velocity with zero acceleration.

B. It will have a constant acceleration up the hill, but a different constant acceleration when it comes back down the hill.

C. It will have the same acceleration, both up the hill and down the hill.

D. It will have a varying acceleration along the hill.

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12#

Single-Choice ( 1.0 marks) (No. in Group 12/27) Whole-Paper View eid: 794 R:W 156:99 Correct Percent: 61% Difficulty: *****

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Under what condition is aver fvw j.lqja430age velocity equal to the average of the object's initial and final vv fal3q4w. jj0elocity?

A. The acceleration must be constantly changing.

B. The acceleration must be constant.

C. This can only occur if there is no acceleration.

D. This is impossible.

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13#

Single-Choice ( 1.0 marks) (No. in Group 13/27) Whole-Paper View eid: 795 R:W 199:46 Correct Percent: 81% Difficulty: *****

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Objects A and B both start at rest. Thuua li d).x /0h 7*tjt:r+rvyfey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What jt vy+.rui/*x a7: 0lrf u)tdhis the final speed of object A compared to that of object B?

A. the same speed

B. twice as fast

C. three times as fast

D. four times as fast

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14#

Single-Choice ( 1.0 marks) (No. in Group 14/27) Whole-Paper View eid: 822 R:W 194:31 Correct Percent: 86% Difficulty: *****

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An object moves 15.0 m north and then 11.0 m south. Find both the /o40hnvmo+. ,jlp8cunt +sq3ollkv 6distance traveled and the mavhjm 6ols3 vo8/ t+nuonp,0 .ql4klc+gnitude of the displacement vector.

A. 4.0 m, 26.0 m

B. 26.0 m, 4.0 m

C. 26.0 m, 26.0 m

D. 4.0 m, 4.0 m

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15#

Single-Choice ( 1.0 marks) (No. in Group 15/27) Whole-Paper View eid: 823 R:W 153:64 Correct Percent: 71% Difficulty: *****

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A boat can move at 30 km/h in j + rte 52oqm :dh -98wa3garqg+-hogtstill water. How long will it take to move 12 km upstream in aer8+h9 3-ogq -:d2oq+tthgaa5 wrmgj river flowing 6.0 km/h?

A. $20 \; min$

B. $22 \; min$

C. $24 \; min$

D. $30 \; min$

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16#

Single-Choice ( 1.0 marks) (No. in Group 16/27) Whole-Paper View eid: 825 R:W 154:54 Correct Percent: 74% Difficulty: *****

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What must be your average speed in order to travel 35uso: mk3 xpu8x eni*.+0 km in 5.15 h?

A. 66.0 km/h

B. 67.0 km/h

C. 68.0 km/h

D. 69.0 km/h

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17#

Single-Choice ( 1.0 marks) (No. in Group 17/27) Whole-Paper View eid: 826 R:W 178:63 Correct Percent: 74% Difficulty: *****

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A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min8z,0abrp y3a/ q 7zzxs. What is the average spea 7byz30rzz a/ s,qp8xed of the runner in m/s?

A. $14.2 \times 10^{3} \; m/s$

B. 124 m/s

C. 3.95 m/s

D. 14.2 m/s

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18#

Single-Choice ( 1.0 marks) (No. in Group 18/27) Whole-Paper View eid: 827 R:W 158:32 Correct Percent: 83% Difficulty: *****

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A car travels 90 km/h. How long does i ug-.jyr)bm5 he wa/d(t take for it to travel 400 km?

A. $4.1 \; h$

B. $4.2 \; h$

C. $4.3 \; h$

D. $4.4 \; h$

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19#

Single-Choice ( 1.0 marks) (No. in Group 19/27) Whole-Paper View eid: 829 R:W 167:73 Correct Percent: 70% Difficulty: *****

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If you are driving 72 km/h along a straight road and you lo* phsy0bc.:p+y c-d4rnogud4 ok to the side for 4.0 s, g *+cdn-:p0ud4r. ypho4sc byhow far do you travel during this inattentive period?

A. $18 \; m$

B. $20 \; m$

C. $40 \; m$

D. $80 \; m$

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20#

Single-Choice ( 1.0 marks) (No. in Group 20/27) Whole-Paper View eid: 830 R:W 118:167 Correct Percent: 41% Difficulty: *****

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If you run a complete loop around an oj-u6mnf , 7yeeat+t8 wutdoor track (400 m), in 100 s, your average velocita 8ftnem6- yj uew,+7ty is

A. 0.25 m/s.

B. 4.0 m/s.

C. 40,000 m/s.

D. zero.

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21#

Single-Choice ( 1.0 marks) (No. in Group 21/27) Whole-Paper View eid: 831 R:W 137:96 Correct Percent: 59% Difficulty: *****

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A polar bear starts xz9r k80k.v dp i9 z*(hqmewi(-svj+mat the North 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. What was the bear's average spe*i8 p-x9r m zj.h ms(vdk0ik+(zvqew9 ed?

A. 0 km/h

B. 0.09 km/h

C. 4.5 km/h

D. 5.3 km/h

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22#

Single-Choice ( 1.0 marks) (No. in Group 22/27) Whole-Paper View eid: 832 R:W 138:108 Correct Percent: 56% Difficulty: *****

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A polar bear starts at the l rwvrgb5:vwblz5ak .9c-7y ;l f0zs, North 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 0 yl:w.;kcbf5 sv9az ,zr bgrv7-lwl545 min. What was the bear's average velocity?

A. 0 km/h

B. 0.09 km/h

C. 4.5 km/h

D. 5.3 km/h

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23#

Single-Choice ( 1.0 marks) (No. in Group 23/27) Whole-Paper View eid: 833 R:W 169:76 Correct Percent: 69% Difficulty: *****

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You are driving home on a weekend from schooh f dqt 3b-)0cqjvv0j2l 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 hometown fr)cv0q3v2-t bd0h jfj qom school?

A. $180 \; mi$

B. $190 \; mi$

C. $200 \; mi$

D. $210 \; mi$

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24#

Single-Choice ( 1.0 marks) (No. in Group 24/27) Whole-Paper View eid: 834 R:W 147:86 Correct Percent: 63% Difficulty: *****

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A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. e8 25 k(vqgvrzygb,y3 What is the average speed,rz2bv gv8 5 (e3kgyqy of the motorist for this trip?

A. 84 km/h

B. 89 km/h

C. 90 km/h

D. 91 km/h

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25#

Single-Choice ( 1.0 marks) (No. in Group 25/27) Whole-Paper View eid: 835 R:W 174:51 Correct Percent: 77% Difficulty: *****

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A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her smnw) hh9y1i-average speed for ty9h sn1)mw -hihe trip?

A. 85 km/h

B. 88 km/h

C. 90 km/h

D. 92 km/h

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26#

Single-Choice ( 1.0 marks) (No. in Group 26/27) Whole-Paper View eid: 836 R:W 164:68 Correct Percent: 71% Difficulty: *****

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An airplane travels at 300bd eg bm(x;wshgc9 f:8y:nqe/ k;0pm + mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the mng+;em bq/fk(ed:wyb g09ph8s; c x:trip?

A. 260 mi/h

B. 270 mi/h

C. 275 mi/h

D. 280 mi/h

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27#

Single-Choice ( 1.0 marks) (No. in Group 27/27) Whole-Paper View eid: 837 R:W 146:76 Correct Percent: 66% Difficulty: *****

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In a 400-m relay race 3afs64xq nwqg(,w 9iuq; nqd -f41azh the anchorman (the 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 whenu, ;-fqaq(sq1xhi44faz9nqdn w w63g the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

A. $2.0 \; m$

B. $3.0 \; m$

C. $4.0 \; m$

D. $5.0 \; m$

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28#

Free-Response ( 1.0 marks) (No. in Group 1/7) Whole-Paper View eid: 10136

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第 2 题组 (共 7 题 7 分)

If one object has a greater speed than a second object, d;ir8f r,lwl)a oes the first necessarily have a great;rw8r , al)lifer acceleration? Explain, using examples.

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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 80 km/h to sbd4;yhx(4hm6 tdiw ; 90 km/h with the acceleration of a bicycle that accelerates frt dsh4x64id;ym wh( b;om rest to 10 km/h in the same time.

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30#

Free-Response ( 1.0 marks) (No. in Group 3/7) Whole-Paper View eid: 10138

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Can an object have a northwar 09;2goj /il slnbxcu0d velocity and a southward acceleration? Explain.

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31#

Free-Response ( 1.0 marks) (No. in Group 4/7) Whole-Paper View eid: 10139

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Can the velocity of an object be negative when its accel- eratiovu*r 0*m;len bn is positive? What about vice v;r ul 0e*b*nmversa? If yes, give examples in each case.

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32#

Free-Response ( 1.0 marks) (No. in Group 5/7) Whole-Paper View eid: 10140

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Give an example where both the velocity and accel m1v5*g3u 9dmemrg0( :mfwal feration are negative.

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33#

Free-Response ( 1.0 marks) (No. in Group 6/7) Whole-Paper View eid: 10141

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Can an object be increasing fya t1d4lk /+/jci+ tein speed as its acceleration decreases? If so, give an example. If not, explcy/d/a+lj1ti +4fekt ain.

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Two cars emerge side by side from a tunnelp4zbf)cs baf) 7e+yq5. Car A is traveling 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 comep)7+5 qbazyef f4c)sb out of the tunnel? Explain your reasoning.

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