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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 travels from one point in space to another. Make a couyhari l9s 87ad u(q.4mparison between the displacement and the distance travs.97(ru4uha da8i ylqeled.

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 to the intm)( hxz1ga 1pstantaneous 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 manufacturer6epuge3(spf5dx3 t.rdxq 6b35voj : k advertises that their car can go "from zero to sixty in 8 s". Thistdbejrfqped3p5x xk5 .(:vg 6 s33o6u is a 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 170:66 Correct Percent: 72% Difficulty: *****

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An object moving in the +x axis experiences an acceleration of:eb-qb6)uno l0m+ yv6;uk xb 4z9kntr $2.0 \; m/s^2$. 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 Wrl4xcp,ro s8mn;a +y/est (-x direction) begins to slow down as it approacm paryxs8+, /rnco l;4hes a traffic light. 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 184:53 Correct Percent: 78% Difficulty: *****

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Suppose that an object is moving with ndi v( 3shka*2rg9to7 a constant velocity. Make a statement concernia o ris2tk3(h*97vndgng its 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 133:126 Correct Percent: 51% Difficulty: *****

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If the velocity of an object is nfyk0 pzshvj 6m(;h3mfc+-*a /jfc4wzero, does it mean that the acceleration is zero? Supppj(; f f0hs/cmafjc6ynzw*+4v -mk3h ort your answer 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 dir*awp7 -tt3n e4lv (vrkection when its acceleration is constant? Supportle*ka47vt v(3w t-rnp your answer 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 moving with constant acceleration. Make a statement 5qwbi. q:fav4e 2pn.r concerning its motion with req .24 en5pqfw.virb a:spect 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 increasing speed whk7jeqm oj(ln hy/kc;:5 -xyu2ile its acceleration is decreasing? Supporkmu y-2:ojkxh / nl;e( 5qcj7yt your 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 kick,w,cag.;) fv, ko /lhnd moves up along a smooth hill of ice. Make a statement concerning io,, acn lk/v hw.;g)fdts 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 average velocity equal to the average of the object's aeol8hn+hz*6i2 1x khinitiaoxh+6kz lea*h82 hn1 il 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 199:46 Correct Percent: 81% Difficulty: *****

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Objects A and B both start at rest. They both accelerate at the same rat s0qggem 29b+oe. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of + gq bseomg092object 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 dista9vv gr u,y2wx2nce traveled and the magnitude of the disxrguv, vy922 wplacement 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 k6+g5e*3z8tg,a v 0+bemexe awuz dgh:m/h in still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?0u8:awab,ete 3d++ egg zehmzx*6 v5g

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 350 km in ;qp/ 5(hcth39hu oc hjpzt xv, **-jb5uczaj) 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 (approximatelmr:n4dzo (m)/gisx1 f y 42.0 km) in 2 hours and 57 min. What is the average speed of the gid o/(fz4) m:smr nx1runner 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 it take fd.c/p4 jtgnqy:km9/ vor 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 b 83k+ zncs*eeuy +9w.wwo-xlstraight road and you look to the side for 4.0 s, how far do you wo c+ys-w ee 9+*b.nk3zl8 uxwtravel 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 outdoor track (400 m), in 100 s, y-*-rz7 kiusupont3 x k;8 xmd78g)azeour average ve d8rx- k-i;up kg3 ze7aou)7xtm*s n8zlocity 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 at the North Poleapx dp1ld2p )er5t3o-. 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 1d le axrpp2pd)5t- o3min. 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 138:108 Correct Percent: 56% Difficulty: *****

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A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eau(p+jxr9ub cj7wg yglh :6 h+l0vqk52st, then 1.0 km north, then 1.0 km west to retuuuw+6hxygcbr: (9 25g j lh0lq7jk v+prn to its starting 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 169:76 Correct Percent: 69% Difficulty: *****

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You are driving home on a weekend from school at 55 mi/h for 110 miles. j hnp0k*dwate sq,f7( ( op;-d/a 8q6qp-dpuo It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hon*w p(86sa ot0 pdqp/ add(-qh-ujfekp;7o, qurs and 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 147:86 Correct Percent: 63% Difficulty: *****

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A motorist travels 1gt pp2dxz6- 4/ph m1dl60 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist forl/h1 6d -dpzpx4gmp 2t 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 l j(,zos;)yx qh; c.tuat 100 km/h. What is her average sp.c(;osx tz ,ljhuy )q;eed 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 164:68 Correct Percent: 71% Difficulty: *****

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An airplane travels at 300 mi/h south for 2.0 pdxl1 8-/q/mcrzd nphz6tii3( f)ce(0 h and then at 250 mi/h north for e zh -8pt6(1i)x3n/lfiq/c(r cpzdmd750 miles. What is the 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 146:76 Correct Percent: 66% Difficulty: *****

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In a 400-m relay race the anchorman (the person who runs the g 6;a-3kvjt/;3z-m kfqlo byilast 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m kztb3fl ;- a;goq3v/kij6y -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, d6c-b ub3mcph 3oes the first necessarily have a greater acceleration? Explain, using exa ubb-ccp63m3h mples.

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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 tf;1y4 q:z m3ee cu3dymdk..b.w p4bh 90 km/h with the accelerationz c3h4 dm p eb:4.bkuye;.fmq1ytdw3. of a bicycle 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 velocity and a southward acceleration? Expl+wsm.2l . cnhpptu, 03gbov- aain.

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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 hmpcj ;*4xk*xq 7p fd7negative when its accel- eration is positive? What **kppcj; m47xhdf7 qxabout vice versa? 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 accelera eyljfai j7zpw 1.e.;w.+-k tftion 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 incre63mz1/mzvc i bzzk 88sasing in speed as its acceleration decreases? If so, give an example. Izisb868vmk cz zm/1z3 f not, explain.

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Free-Response ( 1.0 marks) (No. in Group 7/7) Whole-Paper View eid: 10142

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Two cars emerge side by side from a tunnel. Car A is travebn7 )kg(/:ss q5cp)psvdhu5 v ling 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 andpvhkd5u:/vnscs s 5 7q)( pgb) 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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