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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 129:84 Correct Percent: 61% Difficulty: *****

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第 1 题组 (共 27 题 27 分)

Suppose that an object travels from one poil dl;b1f*zc)7ey/4vmpuh hc (nt in space to another. Make a comparison between thzvlc*umf/ ;dh )b( h7cle4 yp1e 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 169:56 Correct Percent: 75% Difficulty: *****

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When is the average velocity *vt6p 9lgx4 nfok m 0f8p7bzx3of an object equal 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 131:91 Correct Percent: 59% Difficulty: *****

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A new car manufacturer advertises that their car can go "from zero ton *k5c;xwplq6xd )a )pdq ry.. sixty in 8 s". This is aakd*dqcr))x5yw; nl6x..p q p description of

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 149:63 Correct Percent: 70% Difficulty: *****

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An object moving in the +x axis experiencesm9f 6a yjd/db5 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 112:87 Correct Percent: 56% Difficulty: *****

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Suppose that a car tramjba / )w+f0; bx-+wutbyrd-f veling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement co-;wafrfu b-b 0d +b)t x+wmjy/ncerning 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 162:53 Correct Percent: 75% Difficulty: *****

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Suppose that an object is moving with a constant velocity. Make a statement +. *kqjz2ijzxi4bkh 8 hkftd.b1v/4hconcerning its acceleratiokd/i*hivjkf x+q8b44hth j z.. z2 1bkn.

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 114:115 Correct Percent: 50% Difficulty: *****

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If the velocity of an object is zero, does it mean that the acceleration n2b ynlk+q -)z/fj1 vqis zero? Support your answer with an examplbj 12kq)/f qv+znyn-le.

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 127:122 Correct Percent: 51% Difficulty: *****

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Can an object's veloc-9ikd t-irz :rity change direction when its acceleration is constant? Support your answer wiik zrr-:d-t i9th 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 142:73 Correct Percent: 66% Difficulty: *****

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Suppose that an object is moving with constantl in eo0a b )o)p6sta/zutu gf.z51,1h acceleration. Make a statement concerning its motion with respect to tip/oantg f0)t)z5z1 usei, bu ho6.1lame.

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 121:109 Correct Percent: 53% Difficulty: *****

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Can an object have increasing 6th- lyikw 8 ;u9o 7gpyd,crfzh58r+hspeed while its acceleration is decreasing? Support your answer with anph9; tg5-o 6ikyuzw8h, r8yf7 +crhdl 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 76:106 Correct Percent: 42% Difficulty: *****

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Suppose a can, after an initial kick, moves ,8*n;fumjj3 xm,c dhs up along a smooth hill of ice. Make a statement concerning its acc3j 8,*sx;dmn c ju,fmheleration.

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 137:91 Correct Percent: 60% Difficulty: *****

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Under what condition is averag s)o ow d4u:5-qdum;npe velocity equal to the average of the object's initial and final velocitu oqm5p4 wdo)sud; -:ny?

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 178:44 Correct Percent: 80% Difficulty: *****

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Objects A and B both start at rest. They both acc6pfm1ah;7qoxs g(8vh elerate at the same rate. However, object A accelerates for twice the time as object B. 6qv afhmpg s;7x81( hoWhat is 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 173:30 Correct Percent: 85% Difficulty: *****

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An object moves 15.0 m north and then 11.0 m south. Find bjmd4rz3 fsv ,u5d;f (noth the distance traveled and the f5smd4v,n z;f(u3 dr jmagnitude 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 132:62 Correct Percent: 68% Difficulty: *****

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A boat can move at 30 klo5bj-p l.rnq6 n4*zb m/h in still water. How long will it take to move 12 km up lb6-br4zn5n*lq jo.pstream in a 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 132:54 Correct Percent: 71% Difficulty: *****

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What must be your average fcm5zi f, lr/w qgc2-xe4q e(kkg 546fspeed in order to travel 350 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 156:62 Correct Percent: 72% Difficulty: *****

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A runner ran the mara7uklb2mv o .85hbf t-vthon (approximately 42.0 km) in 2 hours and 57 min. What is the average speed of tf 5 v2hbob.um78-lv kthe 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 136:32 Correct Percent: 81% Difficulty: *****

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A car travels 90 km/h. How long does it take for it taip(30zez, neplh fk,)h2i0zo 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 146:73 Correct Percent: 67% Difficulty: *****

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If you are driving 72 km/h along a straight road and you loow m -x.jrl8po3k to the side for 4.0 s, how far do you travel during this inattentive period?mxp-8.oj3 lrw

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 100:159 Correct Percent: 39% Difficulty: *****

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If you run a complete loop around an outdoor track(5pevob, 5fmc i (sqp- (400 m), in 100 s, your average velocitq5mpocvp i, (s-f(eb5y 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 117:94 Correct Percent: 55% Difficulty: *****

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A polar bear starts at the North Pole. It travels 1.0 k2q wbt*secjq2(cg, hq6u5 c:gm south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This tripwqtgc*c,quj cs5 2:qeh (b62g takes 45 min. What was the bear's average speed?

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 119:105 Correct Percent: 53% Difficulty: *****

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A polar bear starts at the North Poh 1fedmh um7hu5 qo,k 8-um+x;le. 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 p7 5ouq ;mh+ef,hdk- hmuux81 moint. This trip takes 45 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 148:75 Correct Percent: 66% Difficulty: *****

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You are driving home on a weekend from school r+fpp 9jnz, s0. cxlw80k8 acpat 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 x,rz8s0p8 cpf0awcl. n 9 +pkjfar is your hometown from 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 127:82 Correct Percent: 61% Difficulty: *****

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A motorist travels 160 km at 80umrmvo)*.cc1wi , nn)z wr w 9-yo8w9t km/h and 160 km at 100 km/h. What is the average s.owiv *1 w8tw )mu-,9 mnczwrr y9c)onpeed 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 153:50 Correct Percent: 75% 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 heiqsv cq u04:8lr average sp8qci q 4v0:lsueed for the 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 143:67 Correct Percent: 68% Difficulty: *****

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An airplane travels at 300 mi/h south for 2.00 h and then at 250 r;rh (cziu)vy7t v+2xq-:hgemi/h north for 750 miles. What is the average speedvx rh7zt(r; v:equ +hicg-)2y for the 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 126:72 Correct Percent: 64% Difficulty: *****

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In a 400-m relay race the anchormansew 248s(toga*z n,sv (the person who runs the last 100 m) for team A caneosnvs*s 4z8 wtag(2 , 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?

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 : iv dy;gx;qk9z .si)ua second object, does the first necessarily have a greater acceleration? Explain, using examplesu 9i;q:;sv id yx.zkg).

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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 accele30 hubn.qybx)yt5ymh-2 bqg2 rates from 80 km/h to 90 km/h with the acceleration of a bicycle that accelerates from rest to 10 km/h in theym by0y53nht. 2xb- h2qg qu)b 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 northward velocity and a southwarnlbushcc2-t/i 05 mw6d 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- eration is posss -i,d0e ,wkfitive? What about vice versa? If yes, giv i,-w d0kfsse,e 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 acceleratw;n/bj x r0re6ion 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 in speed as its acceleration dew1v- oo.5vs:d9bt.fio u o: kgcreases? If so, give an example. If not, explain..9k:obfou- 1 .o it sowvvg5:d

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Two cars emerge side by side from a tv( aanm 2hj3 z2e72lztunnel. 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 clh2a vtm3j(ez22z 7 naome out of the tunnel? Explain your reasoning.

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