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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 object travels from one point in space to another. Make a d2k xgjzoc61 .comparison between the di cz6j dg1k.xo2splacement 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 161:55 Correct Percent: 75% Difficulty: *****

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When is the average velocity of an object equh: *prgdv 5jkpn)5 8gtal 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 123:91 Correct Percent: 57% Difficulty: *****

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A new car manufacturer ak78itm oii5j,t(dsb6* .8 ekbgsy+oy dvertises that their car can go "from zero to sixty in 8 s". This is a descriptitj,m5 +*8 (. ek iyboi8gso dist6y7bkon 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 an acceleration of dn) 3a/anlv a rt1v gw5o yfurb047i(7$2.0 \; m/s^2$. 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 difj8-1f jxkt8o)do o8ll:obh) rection) begins to slow down as it approaches a traffic light. Make a statement concerning its)kh tfj f-o:8lxo1 )d8ool 8bj 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 gjx. rgv9uo /j z6e0r8;pu5zmstatement concerningzgrx.z0/v;p8g5uo 69rujme j 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 106:114 Correct Percent: 48% Difficulty: *****

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If the velocity of an object is zero, does it mean that th/ zjm-nk/ydk/ e acceleration is zero? Support your answer with an exammnzj-dky/ //kple.

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 direction when its accel q3ap6:o4ftwfqo.f4z eration is constant? Support youot4 q6w.pfzffa 4 :qo3r 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 134:73 Correct Percent: 65% Difficulty: *****

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Suppose that an object is moving with constant accezo9 *f0gy:g keleration. Make a statement concernink y09*ogfe: zgg 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 114:108 Correct Percent: 51% Difficulty: *****

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Can an object have increasing speed while its accelerationvht gq: v6qi4h,nn 39a2gcy ,u is decreasing? Suppoq,4c3hi: qu6vtnav 29,g hy gnrt 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 68:106 Correct Percent: 39% Difficulty: *****

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Suppose a can, after an initial kick, moves up along a smooth hill of ice. Mu h,,xa. jj;y op. v2d-wnmob:ake a statement cono2vwmo.n ; h b:j ,,-p.ujdayxcerning 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 129:91 Correct Percent: 59% Difficulty: *****

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Under what condition is average qiyo03p1y/xg velocity equal to the average of the object's initial and final i 1y/0qxyogp3velocity?

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 both acceleratev,n4- rf2tf tpqf3h b, at the same rate. However, object A accelerates for twice the time as object B. What is the finan-fr b2 43t,qp,fvh tfl 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 165:30 Correct Percent: 85% Difficulty: *****

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An object moves 15.0 m north and then 11.0 m south. Find bm6t-h f( rs;jvoth the distance traveled and the -6fv j;(trshm magnitude 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 water. orr- d8gr wqov0:l8(8 uf 4nln How long will it take to move 12 km upstream in a ril8ulvgo8-4 nn(:0r 8qo wd rfrver 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 travel 350croy xfl 5s1 +42wrv1f 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 (apprz9o lnfca+g mst(; ihb*a- -,foximately 42.0 km) in 2 hours and 57 min. What is the aveant ,f-b s+*zhi9lm-;(o gcafrage 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 long does it take for it to travel 400 xptq4ey5 yr)+w -v)z jx n 92+z m;z5+yqtzbiikm?

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 and you look to9ddmr. t(4ifu) h0nv;b 4wsgc the side for 4.0 s, how far dog wv 4imcr.fs(;0)ddn uh9t4b 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 92:157 Correct Percent: 37% Difficulty: *****

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If you run a complete loop around an outdoor track (400 m), in 100vt-vxwg*01duav xt5l9k24mbxubo 6 - s, your average velocity isv1mwx5 tbua-*vvo u dx-t06kbl2x4g 9

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 v,91.s:ejk0d81iox rl :j 3ry;y xsunieyre* at 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 spy9:i sie:1jdu l1*;rr nj.8v skx0 e, oexy3yreed?

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. )n/pbjb++6c 6abv iio*ji ov- It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to rebivin6b-p/c+b6) +oja iv *ojturn 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 140:75 Correct Percent: 65% Difficulty: *****

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You are driving home on a weekend from school at 55 mi/h for 110 miles. I-m 7- yv cv0: hwtwk m;jkua,+ex0e9n0pwhc5 ut then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutesawmukyx0cmh -,0hj 0pe-uk w5tw+ c: v9;v7ne. 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. What 6b 2 m.ntip+-i0ot ezxis the average speed of the motorist for this trip2mo+z i6xe. i-pnbt t0?

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. What is her avios.5 3,itara.ah v1terage speed for the tri1i o ha5risa.t,at .v3p?

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/h south for 2.00 h and then at 250 mi/h north for x.byj jr(l- u6750 miles. What is the averaxy(-l j6rju.bge 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 thq ;xg((,ue) 8jlgnj kre 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 thex()u jjgk8,qln r(g; e 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 objecko+0th5 *ydnl t, does the first necessarily have a greater acceleration? Explain, using l0okd+h5ynt * 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 acceleratesr,f43ez0nzbhr0 q+u2q ezq9m from 80 km/h to 90 km/h with the acceleration ofb90 fzq u4re3rq+hq zne20 ,zm 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 ac7 6thdrz em.zk-ud )0iyr 0*qhceleration? 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 +nvymmsk5 ,h+ is positive? What about vice versa? If yes, give examples i5vhk ,++y snmmn 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 veyy o 4a54v1jyg (vn9w)ayg6uwlocity 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 speed as its acceleration decreases? If sok/ uaq,2h5ij g, give an example. If i5h j2a u,/gkqnot, 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 traveling with cl:quq5b cm /lwz 412yx8f9jm 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 aqmj5/c yxqlml zb 98c1u:wf42 n 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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