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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 121:83 Correct Percent: 59% Difficulty: *****

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第 1 题组 (共 27 题 27 分)

Suppose that an objef6ykwx5y i 8g23 r w/d8xy/gwkct travels from one point in space to another. Make a comparison between the displacement and the distance travele3dyg rw828 wiw xy 6x5gyf/k/kd.

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 161:55 Correct Percent: 75% Difficulty: *****

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When is the average velocity of an object equal to the instantaneous ve gsk0 e5 4rj:uz(wvvn/locity?

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 123:91 Correct Percent: 57% Difficulty: *****

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A new car manufacturer advertises that their car ca ylunwk.b6(wbp2a8a+ n go "from zero to sixty in 8 s". This is a wbpal8ayu 26n.kw+b( 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 141:63 Correct Percent: 69% Difficulty: *****

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An object moving in the +x axis experiences age5o7s z lb7f2n 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 104:87 Correct Percent: 54% Difficulty: *****

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Suppose that a car traveling to the West (-x direct+urcq+ k hc*-sion) begins to slow down as it approaches a traffic light. +*crkqc+ -suh Make a statement 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 154:53 Correct Percent: 74% Difficulty: *****

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Suppose that an object is moving with a constant velocity. Make a czl2x6m sj r8r15l )u-n(tr cpstatement concerning i6cl2slt(5r-p1rzjm) u 8n cx rts acceleration.

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 106:114 Correct Percent: 48% Difficulty: *****

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If the velocity of an object is zero, does i;3i. luwq+ joet mean that the acceleration is zero? Support your awo3 u lq+e;.ijnswer 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 119:122 Correct Percent: 49% Difficulty: *****

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Can an object's velocity change directioj yyov4l3xl8ag28f (hn when its acceleration is constant? Support your answer with an exam4v xy3 lly8h(8a2foj gple.

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 134:73 Correct Percent: 65% Difficulty: *****

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Suppose that an objectapj-i9/ b3 yfd is moving with constant acceleration. Make a statement concerning its motion with respect to tj3 ip-d/f9y baime.

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 114:108 Correct Percent: 51% Difficulty: *****

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Can an object have increasing moxt-hp 0rii9;1w.yk speed while its acceleration is decreasing? Support your answer- oyi;pxhr1i kwm9.0t 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 68:106 Correct Percent: 39% Difficulty: *****

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Suppose a can, after an initial kick, moves up alsu5 qt6 snj+x).c (n0u:jge kiong a smooth hill of ice. Make a statement concerning its acceleu:cu5 k0n( s6xs jg)nijt.qe+ ration.

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 129:91 Correct Percent: 59% Difficulty: *****

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Under what condition is average velonwnb:*. v p-xycity equal to the average of the object's initpb nw -n*:vyx.ial and final velocity?

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 170:44 Correct Percent: 79% Difficulty: *****

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Objects A and B both start at rest. They bs+5eesk37qmb m -;/ i toyeo0c.q .orvoth accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to thaqoeebotmy .3c+v0eo/. q r7;-5s k msit 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 165:30 Correct Percent: 85% Difficulty: *****

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An object moves 15.0 m north and then 11.0 m south. Find both the distance travoxnay n *91exm* 3v:t,0 saxeeeled and the magnitud ,nnxam 9 tx*e 1:yeeav*xs03oe 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 124:62 Correct Percent: 67% Difficulty: *****

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A boat can move at 30 km/h in still bux)jx-pzw b +r( )xx,water. How long will it take to move 12 km upstreazpj-w)xbxxxu )r b+(, m 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 124:54 Correct Percent: 70% Difficulty: *****

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What must be your average speed in order to trav j hs-ouv r8(;*aapdr-el 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 148:62 Correct Percent: 70% Difficulty: *****

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A runner ran the marathon (approximately 47:) rwkn;n1ogy)mtn /9 kdwyk 2.0 km) in 2 hours and 57 min. What is t; my9 1 wr)nno:k g/ky)td7nkwhe average speed 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 128:32 Correct Percent: 80% Difficulty: *****

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A car travels 90 km/h. How lon 8ufr0q9t o+* (an-ds*yvyqndv3 s)vqg does it 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 138:73 Correct Percent: 65% Difficulty: *****

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If you are driving 72 km/h along a straight road kd1; t+jsof94wfi4qeo)+tjy and you look to the side for 4.0 s, how far do you travel during this y4tq o4fi+ o+tdfk1)w;jjs9einattentive 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 92:157 Correct Percent: 37% Difficulty: *****

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If you run a complete loop around an outdoor trjgis2of:b u:u39dcx ru k8p9 5ack (400 m), in 100 s, your average velocity is5 3xpsfi9 r:cg82uojuubd :9k

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 109:94 Correct Percent: 54% Difficulty: *****

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A polar bear starts at the North Pole. It travels 1.0 km evum9or 8phf hr99v:, south, then 1.0 km east, then 1.0 km north, then 1.0 km west to 9ho9vr: r8m, efhvpu9return to its starting point. This trip 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 111:103 Correct Percent: 52% Difficulty: *****

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A polar bear starts at the North Pole. It travels 1.0 km so/np5sm 1wgg4j uth, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its sta5jns4 1g/wgmprting point. 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 140:75 Correct Percent: 65% Difficulty: *****

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You are driving home os-;z9w28lmm4nw0 r-v rlyk vln a weekend 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- l-kw;m 92rwn0vllvz4 ms8ry 15 minutes. How far 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 119:80 Correct Percent: 60% Difficulty: *****

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A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. Wx /xolil-, rm4hat is the average speed of the moi/o4 ,l xxlrm-torist 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 145:50 Correct Percent: 74% Difficulty: *****

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A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. W0fki*- 7al0dsqy n7nokf.* s, bw xlr9hat is her average speed fn b7six ,orkn dfw07qa0y.l*-f l9 sk*or 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 135:67 Correct Percent: 67% Difficulty: *****

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An airplane travels at 300 mi/hek 2z q/rd(ibf+v5 p6n south for 2.00 h and then at 250 mi/h north for 750 miles. What is d( bqifn/ 2prz6v+ke5the average speed 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 120:70 Correct Percent: 63% Difficulty: *****

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In a 400-m relay race the anchorman (the person who-ymn:mpepx;u k,5xb; 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 100xpem;5yk -pu :bn;m,x 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 a second object, does the first necetnp4( relo/g: ssarily have a greatenpe g (r:/4tlor 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 thm)mxoa8+4 nry;7 iapp3v2 kbq at accelerates from 80 km/h to 90 km/h with the acceleration of a bicycmrm7p38oqbi;kv2 ya np4ax+)le that accelerates from 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 northward sx8i*jh os +0avelocity 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 acc,2m4kodckz( r el- eration is positive? What about vice versa? 2 kzodr4(c,kmIf 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 velos, 6d7)nub-zpfd;nnqm h-1gqb .dmh4 city and acceleration 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 speedahzsk iof7.iu/siyi .l 0j2 9t03+ekw as its acceleration decreases? If so, give an example. If not l s zws7ike.0yj 2.0/i+ihu3ia otk9f, explain.

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Two cars emerge side by side from a 3b- 6v2crnh:8 tx3k-tos tglf tunnel. Car A is traveling with a speed of 60 km/h and has a xgbf862-tto slrn3kc3-: t vhn 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 come out of the tunnel? Explain your reasoning.

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Total:34 mks Pass:20.4 mks Duration:Unlimited

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