51fly国际课程 (51fly.win)

 找回密码
 立即注册

手机扫一扫，访问本页面

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp，上传完成后会在上方生成预览，用鼠标连续双击缩略图，或拖动缩略图，该图片就被绑定至本题，显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片，绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


习题练习：Physics Unit6: Work and Energy
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 60，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test60.html  教师使用本平台可以抽题组卷或一键复制他人试卷，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。
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 游客未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

标记此题
1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of wor:nif3i9 t)f9oa kduwiwgi3 7-k expressed in SI units?

参考答案:    
标记此题
2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no motfp+os ;,gyot ,f.d9 q* rovmu(ion?

参考答案:    
标记此题
3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall, the a*wbu 4z a.njle4k zg -/4nhzd.mount of work you dok. lzzw-zn g4a4h.4e*dbu /j n

参考答案:    
标记此题
4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is being held tflrn771hr2u) vr c h;p-tc 4fzhere. How much work is being dont7 zvp2)frr-c nrhf u4h1l7 c;e in holding the box in this position?

参考答案:    
标记此题
5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity d y5vjj 7jyol;*3vbctcan o45 k7-ju/carrying a 10-N object, the amoun4c; 5j5anj7c j o-vlvk3oytj7buy* /d t of work you do is

参考答案:    
标记此题
6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water t, yfg7 zrjf)6ll-gle b01ed8is lifted vertically 3.0 m then returned to its original positiee-70fjl)zy8fg l,6 gbrl 1 tdon. If the total weight is 30 N, how much work was done?

参考答案:    
标记此题
7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on anfz f 5kdk /jq*b7po:8r object do work on the object?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work done by gravity (/zudpzg *(mz while the ball goes up with the sign of the work done zzup(z dm(g*/ by gravity while it goes down.

参考答案:    
标记此题
9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, represa ipu2(5)jxiib68 ssk2.rbt w sbb. ,ventsa5i. si,)(bbp i.x2ss2 wkrt6bubj8v

参考答案:    
标记此题
10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents the work don-oa q+bx+yq 1le by the forceqbxyaq- l+1o+ F?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

参考答案:    
标记此题
12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, then thes lcrf 1v6h jrgq/s/i) 7 dye1.0b;tsb object's kinetic energy

参考答案:    
标记此题
13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative,u+1 sl aam5h2h then the object's kinetic energy

参考答案:    
标记此题
14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then the object's kinexle ffybv ,qlhw bcj:.g4,,) ,tic energy

参考答案:    
标记此题
15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twice the speed k0 g zh:6) dn6atqzh /xv2ovdv9efn6 1of the car. Which statement is true about the truck's kinetic energy com /noa k hxv6fvd6h6g )9d2vnqz0ez t1:pared to that of the car?

参考答案:    
标记此题
16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as cast8moujdj/l1q7 ;; k hr K, and car J has half the mass of car K. The kinetic energy of car J, compared/s 7j d1ukj;; 8tlqmho to car K is

参考答案:    
标记此题
17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with-i as 2m(/i/ p elvbv;ivjs5p9 half of its original speed. What is the ratio of th/vvvijmpie/ ipals s (;-b 259e final kinetic energy to the initial kinetic energy?

参考答案:    
标记此题
18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s jq r: ed:s3c3 xab9y2nand a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, :y e: sr3bcn23xj9da qwhat is the ratio of the brick's mass to the rock's mass?

参考答案:    
标记此题
19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving with speeemew9wxr ic sb u3bh6834*/jn d 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which o w*6r m hb98x /ecu3njbise3w4bject travels the greater distance before stopping?

参考答案:    
标记此题
20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid hnb)tl 3cgza1n(c7 u 3a certain distance on a straight, level road. If you had been traveling twice as fast, what distance wz 3tn uh()bn3gcc 17laould the car have skidded, under the same conditions?

参考答案:    
标记此题
21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an / 812pak vkd5vo:xmibelliptical orbit. Neglecting any friction effects, 1k 25m8iox:b kvdavp/what happens to the planet's kinetic energy?

参考答案:    
标记此题
22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy princiox:+3 uzs(v 1f;cv kkhd2rs f;ple.
参考答案:    

标记此题
23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

参考答案:    
标记此题
24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have negat9sb qveiabj b9bkf ./wq ,;o+7j;-qkcive potential energy?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above theauq* qrrkk+1ub 3r p8* ground. A second object with four times the mass of the first if released from the same height. The potential brqr u8+pkqu 31 *ak*renergy of the second object compared to the first is

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the g3v( sjn+3xba end of a spring causes it to stretch 5.0 cm. If another ajns vg3bx3+( 0.200-kg mass is added to the spring, the potential energy of the spring will be

参考答案:    
标记此题
28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy s.(5vn -l6/+ glykbwl rrf+zk of a system

参考答案:    
标记此题
29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, to ik2.d1gh a9cywgnq9t67t v0rc. xx: ults potential energyc7txq u. rw ad1ncv hxtl9g2y k96:g.0 U.

参考答案:    
标记此题
30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car driving up aza 8j *pru6gvy92if+d hill.

参考答案:    
标记此题
31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a ve nfs.6;2ceqf gry heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which ;. fcs6en2qgf rises to a greater height?

参考答案:    
标记此题
32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses 1uy oncr*7yy0 4 hgxt,$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

参考答案:    
标记此题
33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of conservation of mechanical energy for con 8 b rrjrkfnh)::qs7.cservative forcesj ns)h7 :qr 8c.kbrr:f.
参考答案:    

标记此题
34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the a2n)u7a x5w*bb+s.b6d n8fhub b wdru7ir (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential ef dw8sw65+bnn*bx2 bubu hr7. d)abu7nergy (U) at the top of the building?

参考答案:    
标记此题
35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 30 J of kinetic en4-y -t *1vlnk mvg2rfrergy. Do not ignore air resistance. How much-rg2yfnt* kv1 lv4rm - gravitational potential energy did the ball lose?

参考答案:    
标记此题
36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and loses 30 J of gravik8rpxjj xo7a fa07 )l*tational potential energy. Do not ignore air resistance. How much kinetic energy did the ball p8ofx)j7l7 ak ar*j0xgain?

参考答案:    
标记此题
37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conserva muyd5jbo 4llypx2k5 4x*u+bjv ;ps 2-tion of energy.
参考答案:    

标记此题
38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t iss 8sn4hu+aox)0/lzv i

参考答案:    
标记此题
39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressed in 368ase*jjt- hghhl n3SI units?

参考答案:    
标记此题
40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, wh r. )afd(1musw+m )suk0cm6waich is not a unit of power?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterdayfo5fsd /l57; nu (bvob:god0r, you did 3 times the work in one-third the time. To do so, your power outpu br/;d5 dg075bosnf o( ov:lfut must have been

参考答案:    
标记此题
42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your cah1l lfd8b5t 3br at a constant acceleration, the car's engine must

参考答案:    
标记此题
43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. .x fnfz2 y7wfb.4zdp( *cims+ If the object weighs 90 N, how much work was done in liftzx(fb .4iy p*.mn27fwzdcs + fing it?

参考答案:    
标记此题
44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, at a constacgzsx- 316dp fnt velocity of 0.50 m/s. What is the work d3 -szg x6fpd1cone by the weight of the book?

参考答案:    
标记此题
45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for a distw-4o*rdoa qe +ance of 50.0 m. What is t*dw ooa- +4qrehe work done by the 5500 N force?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force oa + goh-hs96+uxk4c jnf 5500 N for a distance of 50.0 m. What in gsjx6hu4 ++cako9-h s the work done by the weight of the elevator?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant ftj5vhrrt r 9gdkqr 52w 24**jiorce of 5500 N for a distanc**tj4w2qrrdr rg5t 9 hv25kije of 50.0 m. What is the net work done on the elevator?

参考答案:    
标记此题
48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.0 m up aluil1ata* x(4 song a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

参考答案:    
标记此题
49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruit slides 8.0 m down a ramp, inclined at e:)m,o nk jg(-3uspqn$30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah seaaf dm ,ow/ *(nt(g2in a sled on an icy surface (assume no friction), with a fsad,wn* f 2t(oa/ (mgeorce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

参考答案:    
标记此题
51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the d11pmq* q ;+sj m63cyw xl8hlqwirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when thpml6cq *+1qjqyl;h3m xsw8w 1 e object moves from 0 to 2.0 m.


本题所包含的其它图片:

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6-1 u c2tj 2qt752zh,deoa6caoy: shows thc2c5atd,u toqye7az6hj2 2o:e force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


本题所包含的其它图片:

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the forb7f0 f ggb)o)vce. The graph in Fig. 6-1 shows the force versus the object's position. Find tb7v)ff g0bo g)he work done when the object moves from 4.0 to 6.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. mfio.vh p; +ayqi9f26 6-1 shows the force versus thfv6. foi+9m ahpqi ;y2e object's position. Find the work done when the object moves from 0 to 6.0 m.


本题所包含的其它图片:

参考答案:    
标记此题
55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (n:mh 2-c7kw /)tvnf yainitially at rest) across a 10 m level surface. What is the final kinetic energy of the cartn2m)n / 7:f-vca wthyk?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is appli 5)nu;chmoc 1ced to move a 55-kg cart (initially at rest) across a 10 m level surface. What icm )5chun;1co s the final speed of the cart?

参考答案:    
标记此题
57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.fk * v;h(ebu2o0 m/s. How much work is required to stop hf o;2b*(evuk the mass?

参考答案:    
标记此题
58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initialx3hwl8 -ef(iuost7 b9ly moving at 25 m/s, what distance is required to 9b hi3l8x -to(w7feus stop a car moving at 50 m/s under the same condition?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exe 3fu-5w b q4 os(pguscky7pd4osx4-i /rting a force of 20g44sp k (ub u5ips ocy -/4q3s7oxdw-f N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

参考答案:    
标记此题
60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal com3nno g,64s8vf y* pizcponent of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart y i4v,8gnn z3* fsco6pstarts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of hay,hcdy q;n0rj-5 striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on thed5 -rncj0yh; q arrow?

参考答案:    
标记此题
62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above (2-lvysjlq6bodk i. /a floor to a height of 13.0 m above the floor. What is the change in gravitational potential eok-/v(2q ls b diyj6.lnergy?

参考答案:    
标记此题
63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plane is 4.0 m long and rsw:01y.v b(zo (v+ qf z7necfqises 2.0 m. If the plane is frictionlessv( qbf:n .qe 0z o(vw7yfsc+1z, how much work was done by the push?

参考答案:    
标记此题
64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stret/l uywi8hfy.oq d/u-2ch 2.0 cm. What is the spring co qiuhy8.o /fw-l/d yu2nstant?

参考答案:    
标记此题
65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring const )ug9voqnw:jfe5m.wy3ukt ,; 2kj:p pant of 60 N/m. How much potential energyg,n;utfw u )jep92: 5wp3qm kk: v.yoj does it store, when stretched by 1.0 cm?

参考答案:    
标记此题
66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed spring witj 5ns9fn5+,yd + y77hk .hdmvgxiylz/z t0v7x h a spr +k57 vzvydmtyg7 sn907/jfx5 i +y,zxlnhh.ding constant of 25 N/m by 10 cm.

参考答案:    
标记此题
67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m froe7euedq 0+-o em x = 0.2d- 0oe+qee7u e0 m to 0.25 m? (Assume the unstretched position is at x = 0.)

参考答案:    
标记此题
68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constan;w3ithdd/q+,vqvcul/ 6 ya+ q t of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spriyw+q vh,l/i/u3 cq a;q+v6ddtng an additional 4.0 cm?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest/x fi4x2zynizgt q0qvq;,3o( from the top of a 50-m high slope. What is the speed oyq4 ,vgi(3ixzqt /0 o2qf;nxz f the slier on reaching the bottom of the slope? (Neglect friction.)

参考答案:    
标记此题
70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of dhb/ d1d ojr i:fax+26pqt-v*a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dro*:j 6a+f rd/t1voq d2h- pbxdipping 10 m in elevation?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. 70uga:.ifw sw:zcs- j:k xj*w At the bottom, it has a speed of 9.80 m/s. What is the vertic07j cuxks .agf* swjw:-:w :izal height of the plane?

参考答案:    
标记此题
72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When itgc pc*d/q 50qu is 0.70 m above the floor, its potential energy exactly equals its kinetic energy.c*/cpd0q 5g qu How fast is it moving?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground lev+ wp52 5c/xi yxu+xjrm)mme 9l3nnqd .el with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J./3x 2+qmexrn5d.upmcl xm9w j5niy)+ To what vertical height does it rise?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of 220 J. At h7vci:n 0w,a-u kbv8d the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height,8- i kbv0: 7hcanuw,dv relative to its launch point, did it rise?

参考答案:    
标记此题
75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m abo3ovb+) l jcaoy/q8s8bve the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coas8y8a)osb+cq /b vjo3l ter 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:

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s4pgi,5 d u+wpu :2sivk gwpl,2 at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be dpw4sl5g i,i wu: 2g+p2kuv, pthe 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:

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom 3o;c:y3y chmb.rs je /o/g:suof a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what j;cc:moe/h u.r :33/ssyobygwill be the speed of 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:

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
78#
 
  What is the minimum speed of the ball at the bk 68(vp3pwloh)0x hp hottom of its swing (point

参考答案:    
标记此题
79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

参考答案:    
标记此题
80#
 
  难度:2

参考答案:    
标记此题
81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from the vb xyb2ctp 1i qzq:0-4 dfrye*0ertical axis and released from rest. What will be its speed at the bottom ofby pq4f0 tir*yb: 1zc ed0x-2q its swing?

参考答案:    
标记此题
82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initi). o nrb 65 p6gvlnm( 0x)e-foanwmtb2ally uncompressed horizontal spring with a-n .m rxle)5ontp wnm (0b)vo2f6g6 bspring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

参考答案:    
标记此题
83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a redi3ta x , zs7f8b-cupy5 light. What work is done by the friction force agcxu sb7,3iz 8tayf-5 painst the wheels?

参考答案:    
标记此题
84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horizontal suu3 5n y ftkgh,e/8k(gyrface is 50.0 N. If the initial speed of the object isy(83uten,/khf g5ygk 25.0 m/s, what distance will it slide before coming to a stop?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rou3iu02 l757sk ulkrh9g jzbd-h gh, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 Nj-us53gdbu0rzl7 9h 7 lhkki2 . How far will it slide?

参考答案:    
标记此题
86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontally to a 2.0-kg massrs8;* ksy5nyd on a level surface. The coefficient of kinetic friction betwe5 ;nysrdks8 *yen the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

参考答案:    
标记此题
87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts fro. u,)7fg vt 0m,grutj6joqa8cm rest from the top of a 50-m high slope. If the work done by frict v60urmj8,ug,fa7)ocqjtg . tion is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

参考答案:    
标记此题
88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The pla01gpk..e zd:q 3sx zugne is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the 3.gkq d:.z xp ezsug01plane. What was the magnitude of the average friction force on the box?

参考答案:    
标记此题
89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane inc- da7haq2gj 7glined at 20e above horiz7 2 a-hdgjq7agontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

参考答案:    
标记此题
90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a height of 10.0 m, and ecsds-a .z) 89nwaok 5+7v bkx7blc6istrikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it asc+sx 6oeb)5 9z kw7.ilsb-k7ana dvc8 it falls?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a flight of stairs 10mf.h p2 rqdh 3t21+uzq.0-m high, ihr u1z hdqpf+.mt322 qn
8.00 s?

参考答案:    
标记此题
92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed-0xl4g+uv pyz to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by the forclv gpz xu40+y-e?

参考答案:    
本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，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
93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy arhnwz8lb3e7g9 y )er-f e used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 74ln-h wr)9e3g efyz78b6 W)

参考答案:    
标记此题
94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the ratv cj (( jvsi, kgscy-8h/2l: 9/rms zb5jeis4ie of 500 W while riding. How much force does her b8jhc jiiz: m,rvi4g9e/sk y(jlc2(/5 s -ssvfoot push with when she is traveling at 8.0 m/s?

参考答案:    
标记此题
95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/me,a8. kf;rkn7pb7ius in 7.0 s. What is the average power deliverede8aupi m,kf ;b kn77r. by the engine? (1 hp = 746 W)

参考答案:    
  • 姓名:游客(未登录)
    •
    总分:95分 及格:57分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题，此次习题练习共有 95 道题

    试卷内容到此结束!   © 2025 51fly国际课程 (https://51fly.win)版权所有

    浏览记录|手机版视频|手机版试卷|使用帮助|51fly国际课程 (https://51fly.win)

    GMT+8, 2025-12-20 10:59 , Processed in 0.499804 second(s), 220 queries , Redis On.