Grade 9 Test on Mechanics 20241217 - 题库网 (tiku.one)

1#

单选题 ( 1.0 分) 切至整卷模式 eid: 4094 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A new car manufacturer advertises that their carzsb ;r+cq(ux 2,:y lml can go "from zero to sixty in 8 s". This is a descript u ;:+r(lsz2mc x,qlybion of

A. average speed.

B. instantaneous speed.

C. average acceleration.

D. instantaneous acceleration.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

2#

单选题 ( 1.0 分) 切至整卷模式 eid: 4095 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Suppose that a car traveling to the East (+x direction) begins to slow down as iqj *oi4hpe7q t35m vb1t approaches a traffic light. Make a statement concerninpqioev53b7 4 1m*jtqhg 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.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

3#

单选题 ( 1.0 分) 切至整卷模式 eid: 4096 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

If the velocity of an object is zero, does it mean that the acxgh4t8ci3v )h celeration is zero? Support your answer with an e8 g)t4xh3ch vixample.

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

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

4#

单选题 ( 1.0 分) 切至整卷模式 eid: 4097 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Objects A and B both start at rest. They both accelpge+j;n-zd vtv: (yd 4o/l,ynerate at the same rate. However, object A accelerates for twice the time as object B. What is the fip+(-d/,to ;nevj:gnd4yyvlz nal 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

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

5#

单选题 ( 1.0 分) 切至整卷模式 eid: 4098 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Suppose a ball is throe8kgd* 8;nadh jwjf+xa1 ,4lf wn straight up. Make a statement about the velocity and the acce8 8f l 4+,g*ja;d jn1ewhxdkfaleration when the ball reaches the highest point.

A. Both its velocity and its acceleration are zero.

B. Its velocity is zero and its acceleration is not zero.

C. Its velocity is not zero and its acceleration is zero.

D. Neither its velocity nor its acceleration is zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

6#

单选题 ( 1.0 分) 切至整卷模式 eid: 4099 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Ball A is dropped from the top of:lkf yr8 ap)6fpdta:z t.t6 f+ a building. One second later, ball B is dropped from the rtfaa8dplfy 6:+ .p) :z t6tkfsame building. As time progresses, the difference in their speeds

A. increases.

B. remains constant.

C. decreases.

D. cannot be determined from the information given.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

7#

单选题 ( 1.0 分) 切至整卷模式 eid: 4100 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A cart starts from rest and accelerates zz z f6r/)w5huw yd-x3at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

A. 20 m/s

B. 16 m/s

C. 12 m/s

D. 10 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

8#

单选题 ( 1.0 分) 切至整卷模式 eid: 4101 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A cart with an initial velocity of 5.0 m/s experiences a constamx9nw t jr+0(rnt acceleration of tw+9 r0mjn(xr$2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

A. $10 \; m$

B. $55 \; m$

C. $66 \; m$

D. $80 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

9#

单选题 ( 1.0 分) 切至整卷模式 eid: 4102 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

An object is thrown upward with a spg.f*tv1 x,bwu jx3cz(d(a2zveed of 15 m/s on the surface of planet X where the acceleration due to gravit.xc3ajfb2 1 g d vu(*zzvw(,xty is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

A. $6.0 \; s$

B. $8.0 \; s$

C. $10 \; s$

D. $12 \; s$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

10#

填空题 ( 3.0 分) 切至整卷模式 eid: 4103 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A ball is thrown straight up with a spexr/ ;vzqfq7hy88do 7zed of 30 m/s. (only fill in numerical value in thr v8q7fzo y;7hq z/x8de blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

11#

单选题 ( 1.0 分) 切至整卷模式 eid: 4104 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

In Fig. 2-1, what is the velocity at te: -vy8t,upm r05 m t*fdtsoj; = 5.5 s?

本题所包含的其它图片:

A. 0

B. 10 m/s

C. 20 m/s

D. -40 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

12#

单选题 ( 1.0 分) 切至整卷模式 eid: 4105 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

In Fig. 2-2, what is the acceleration at b fcrj.d 2k3qtfjfv682j:v e-1.0 s?

本题所包含的其它图片:

A. 0

B. $2.0 \; m/s^2$

C. $-2.5 \; m/s^2$

D. $10 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

13#

单选题 ( 1.0 分) 切至整卷模式 eid: 4106 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

When you sit on a chair, the resultant force on youjv r6vbcm ns445h bv p8yf.47e is

A. zero.

B. up.

C. down.

D. depending on your weight.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

14#

单选题 ( 1.0 分) 切至整卷模式 eid: 4107 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

In the absence of an external force, a moving o b5kc *)y89.rwkg/o px bpzu0zbject will

A. stop immediately.

B. slow down and eventually come to a stop.

C. go faster and faster.

D. move with constant velocity.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

15#

单选题 ( 1.0 分) 切至整卷模式 eid: 4108 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

When the rocket engines on the fo brwwl5y yxa(eqx(4,9k 8r k,z )n(dstarship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship wil(fko kl(95xwzd(a) y8, bqwyex4nr ,rl

A. stop immediately.

B. slowly slow down, and then stop.

C. go faster and faster.

D. move with constant speed.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

16#

单选题 ( 1.0 分) 切至整卷模式 eid: 4109 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A net force F acts on a mass m and produces an acceleration a. Wu2nyx2x2 yc7t hat acceleration results if a net focn y2t 227uxxyrce 2F acts on mass 4m?

A. $a/2$

B. $8 \; a$

C. $4 \; a$

D. $2 \; a$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

17#

单选题 ( 1.0 分) 切至整卷模式 eid: 4110 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to theclv9l(9 h ci3x:c9 s-r.g dxaw car. Sin gdr a (x3xh9.:lcc9wcvi9sl-ce a lot of damage is done on the car

A. the force on the truck is greater then the force on the car.

B. the force on the truck is equal to the force on the car.

C. the force on the truck is smaller than the force on the car.

D. the truck did not slow down during the collision.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

18#

单选题 ( 1.0 分) 切至整卷模式 eid: 4111 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

An object of mass m sits on a flatmy 8ds15 c)0rjmr9pfqkc wu:7 table. The Earth pulls on this object with force mg, which we will call the action force. What is the reacrsmc1)uw:jk78r5pmf qy cd09 tion force?

A. The table pushing up on the object with force mg.

B. The object pushing down on the table with force mg.

C. The table pushing down on the floor with force mg.

D. The object pulling upward on the Earth with force mg.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

19#

单选题 ( 1.0 分) 切至整卷模式 eid: 4112 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A brick and a feather fall to the eart5hwma)lxhyv c/ h 06q/h at their respective terminal velocities. Which object experiences the greater force of air frictcav5mhhqyx)h 0 6l /w/ion?

A. the feather

B. the brick

C. Neither, both experience the same amount of air friction.

D. It cannot be determined because there is not enough information given.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

20#

单选题 ( 1.0 分) 切至整卷模式 eid: 4113 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

An object of mass m is hanging by a stri5i4yod +w.u;xbl e5 jyng from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tension in the st;iw edyl.+byuxj 554oring?

A. less than mg

B. exactly mg

C. greater than mg

D. zero

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

21#

单选题 ( 1.0 分) 切至整卷模式 eid: 4114 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A packing crate slides down an inclined ramp at cow+*;ylkh +p uhv:t k-ynstant velocity. Thus we can de vhk+ulp;yk :yt-*h w+duce that

A. a frictional force is acting on it.

B. a net downward force is acting on it.

C. it may be accelerating.

D. it is not acted on by appreciable gravitational force.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

22#

单选题 ( 1.0 分) 切至整卷模式 eid: 4115 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A person of weight 480 N sta( ihe- jm2f+sz4nc8 v3r.q xhgnds on a scale in an elevator. What will the scale be reading when th2q-zfe (vmi.sgjc rx 3h4h8 n+e elevator is accelerating downward at $4.00 \; m/s^2$?

A. $196 \; N$

B. $284 \; N$

C. $676 \; N$

D. $480 \; N$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

23#

单选题 ( 1.0 分) 切至整卷模式 eid: 4116 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, rg,3yex/x: hkwhat is the magnitud yxg3,rhk:/ xee of the acceleration of the system? (Ignore friction and the mass of the pulley.)

本题所包含的其它图片:

A. $5.3 \; m/s^2$

B. $3.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $0.98 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

24#

单选题 ( 1.0 分) 切至整卷模式 eid: 4117 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A student pulls a box of books on a smooth wpyqe,ep;w ag3*r45t.cv o w 0horizontal floor with a force of 100 N in a d qyw4,ag53two wr* ecppv0e .;irection of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

A. $1.5 \; m/s^2$

B. $1.9 \; m/s^2$

C. $2.0 \; m/s^2$

D. $3.3 \; m/s^2$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

25#

单选题 ( 1.0 分) 切至整卷模式 eid: 4118 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A traffic light of weighn4w gh y qw33*2p;6ik* svvdpyt 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in tv nvw i*3h;p6wys3d2*q gk4yp he ropes?

本题所包含的其它图片:

A. $50 \; N$

B. $63 \; N$

C. $66 \; N$

D. $83 \; N$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

26#

单选题 ( 1.0 分) 切至整卷模式 eid: 4119 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Two boxes of masses m and 2m are in contactpk 0lr-po6u);k;n v nb with each other on a frictionless surface. (See Fig. 4-3.) What is the accelerati0 pbu;lonk-r n)v;6k pon of the more massive box?

本题所包含的其它图片:

A. $F/m$

B. $F/(2m)$

C. $F/(3m)$

D. $F/(4m)$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

27#

单选题 ( 1.0 分) 切至整卷模式 eid: 4120 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A horizontal force of 5.0 N accelerates a 4.0-kg mass, from rest, 5uihp(q6ds4x 0)tn gf): m h7mzep4ol at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

A. $2.0 \; N$

B. $3.0 \; N$

C. $4.0 \; N$

D. $5.0 \; N$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

28#

单选题 ( 1.0 分) 切至整卷模式 eid: 4121 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

An object is on a frictionless inclined plane. The plane is incli v6 g,/-zkzen sxi5+lyned at an angle -zsig+vx en5 /lky,z6of $30^{\circ}$ with the horizontal. What is the object's acceleration?

A. $0.50 \; g$

B. $0.56 \; g$

C. $0.87 \; g$

D. $1.0 \; g$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

29#

单选题 ( 1.0 分) 切至整卷模式 eid: 4123 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

If you push twice as hard against a stationary brick wall, yy-qf(juhpfy ;7:qv4ih +u q 4the amount of work you dop+hy fh qfivyqu47 q4(u :y-j;

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

30#

单选题 ( 1.0 分) 切至整卷模式 eid: 4124 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

If you walk 5.0 m horizontally forward at a constant veloci :o;rx15 wnoe:wx d.hmty carrying a 10-N object, the w hdo m:x;nex.:wr1o5amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

31#

单选题 ( 1.0 分) 切至整卷模式 eid: 4125 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

You throw a ball straight up. Compare the sign of the wnz+du2f w:p j sgtg16+ork done by gravity while the ball goes up with the sign of the work done by gravity whi z+n2f wtdju g6sp1+:gle it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

32#

单选题 ( 1.0 分) 切至整卷模式 eid: 4126 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A truck weighs twice as much as a car, and is moving at twfwtvh (1(kat,e, gvg7nb,h 5b ice the speed of the car. Which statement is true about the truck's e,fg7vhtbt kn, (bahw5 1(,gvkinetic energy compared to that of the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

33#

单选题 ( 1.0 分) 切至整卷模式 eid: 4127 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with spe.w0xsoa cr4g )2;lymyd y*x/: m;xxg jed 4.0 m/s. Both objects encounter the same constant br a:jmy ;)*mlwx/d2xx4gyx crg. ys 0o;aking force, and are brought to rest. Which object travels the greater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

34#

单选题 ( 1.0 分) 切至整卷模式 eid: 4128 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Is it possible for a system to have *i odyc y88c.m;iul* l1d(ztr aswi48 negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

35#

单选题 ( 1.0 分) 切至整卷模式 eid: 4129 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

An acorn falls from a tree. Compare its kinetic energy K, to1/ rgf)km wt2)5-inret a2 3mgq/biup its potential enerm 2k tt-gpf/ wi a)u3 )rgqin/1rbe5m2gy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

36#

单选题 ( 1.0 分) 切至整卷模式 eid: 4130 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

Compared to yesterday, you did 3 times the work in one-third the time. To do so,:p8)em- tyk jngw1a;6pvyh x1 your power output must hag1:; xph1w)e nvjtyp-6y 8amkve been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

37#

单选题 ( 1.0 分) 切至整卷模式 eid: 4131 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

If it takes 50 m to stop a car initially moving at 25-t yh dwl9.yx9 m/s, what distance is requ.9wy h9ylt- dxired to stop a car moving at 50 m/s under the same condition?

A. $50 \; m$

B. $100 \; m$

C. $200 \; m$

D. $400 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

38#

单选题 ( 1.0 分) 切至整卷模式 eid: 4132 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A skier, of mass 40 kg, pushes off th 8odiwism y 3oxs88,+a:osa j5e top of a hill with an initial speed of 4.0 m/s. Neg8 js8 +dyi,o :3sxo8sowmaai5lecting friction, how fast will she be moving after dropping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

39#

单选题 ( 1.0 分) 切至整卷模式 eid: 4133 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A toy rocket, weighing 10 N svi+/qvr d5vz95yuyv(j s r38, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its t +58 (v j/vvqdviysrzs u95y3rotal mechanical energy is 140 J. To what vertical height does it rise?

A. $1.0 \; m$

B. $10 \; m$

C. $14 \; m$

D. $24 \; m$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

40#

单选题 ( 1.0 分) 切至整卷模式 eid: 4134 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A roller coaster starts from rest at a point 45 m xz:2( pjl-ulddhr -g0above the bottom of a dip (See Fig. 6-2). Nxd (j-z: upg2hl-0 dlreglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

41#

单选题 ( 1.0 分) 切至整卷模式 eid: 4135 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A roller coaster starts at a point - vhx3rul xori).p; fq(.qpgx6 5vww730 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed ofwp5.(67x ofqx.h vrgv;r)iw lux- q3p the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

42#

单选题 ( 1.0 分) 切至整卷模式 eid: 4136 对错数 0:0 难度: *****

试卷已过期，处于只读浏览模式，无法保存作答

A 10-N force is needed to move an object with a constant velocity of:9wq9qp4154k (dzrdw lmt poo 5.0 m/s. Wpz(4m9w dtol1op kdq:r95q4what power must be delivered to the object by the force?

A. $0.50 \; W$

B. $1.0 \; W$

C. $50 \; W$

D. $100 \; W$

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习题目来源于题库网 (https://tiku.one)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
教师可以抽题组卷或一键复制本试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

账号		自动登录	找回密码
密码			立即注册

未使用图片

本次作答已使用

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42