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://autodiscover.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://autodiscover.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 oo2o gj9x3 p+5no gndn5f work 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 iz-i 0;bd)s*(s fabko uf there is no motion?

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 stationz* d i:sft3c4mq5l0uu+bq+vo ary brick wall, the amount of work you d4qfu +bo v3c:s+d uq0lz5it m*o

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 there. How much worif; w76 .whqy c-bi4nfurbo 19k is being done in hw rof.u4 f i -b9nhwyb7c16qi;olding 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 carrying ;oh5bufi/ h3 0n84 jq/g ofa5z q;hm;p +wzwoja 10-N obje qoi3/um fbna wgq;0h z/z45o8o 5h+w; ;jpjhfct, the amount 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 is lifted vertically 3.0 3n*) 3ga9uitj hi9ecxm then returned to its original position. I*aht 99)n3iei jg ux3cf 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 an object do /d lam-141 vj2t5svt,igyf bb work on the object?

参考答案:    
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 oz304 t sh5wvaz) axe/mf the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes da/ xtz3 0sva5 meh)zw4own.

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 搜藏此题  
  The area under the curve, on a Force versus position (F ,tk f22fdl/n5o8ku bx uqzs()vs. x) graph, represents8blft 2xfqk)5u2d( ,su zn /ko

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 representsilqu; p5jmx( b;:c4cp the work done by t:pm u(;bcq;j54x lipc he force F?

参考答案:    
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 the ob78bg)frpvo(e-+x+7 c l dm.4 lylg oatject'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 qgf2hxl0sv2o j un8*; is negative, 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 f(co 83bqkabz) z(em0is zero, then the object's kinetic 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 spees6 ie;;lvqn 0.bufm*qk,2anfd of the car. Which statement is true about the truck's kinetic energy compared to that of themfl q.e,n;fb*ikq 0vun2a; 6s 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 car K, and car J hasq w)-6t.iu sgv;/td kznu(kmqaj3 /qh( 4rx1c half the mass of car K. The kinetic energy of car J, compared kv tm(ra z4u;q/u1/wh igktq36 -jd)n.x cq(sto 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 wit.; (lh( +uoc:bf peueih half of its original speed. What is the ratio of ( ul( op+uebe.f hi:;cthe 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 o3 wn7 om)9m-3ymopeww ):pttaf 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rwow9 w))n:y7pmm3ot temp- a3ock'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.9 r8jv3xqib7n xrm6es yy- (e+ A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the sxn y6q+i(e yx7jr b3vse8m 9r-ame constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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
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 a certain distance on :owqo9km2 5q2tv5ukx,tm9mi0oz l* g a su , 9 mtg koo2wk0v2mm59 l5oq*zxqt:itraight, level road. If you had been traveling twice as fast, what distance would 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 elliptical orbit. svm8 fo+(hm3 3qni /cm(uyk)xNeglecting any frictm(m 3 (3cisf/ykm +vqo8u)xh nion effects, 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 pr*:3 rom ixeok* e4:gyfinciple.
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:    
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 systkuli.dzj :0h+;u9 w nvem to have negative 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
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 the ground. A second cr39gr l,7)w )pqjc;g3r r 7zr yyz2ayobject with four times the mass of the first if released from the same heighpg rqz72 yrya)rc yc)grj9,7lz w 33;rt. The potential energy of the second object compared to the first is

参考答案:    
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 end of a spr7,/hgukdh 1 pui- uy)cwe.yu:ing causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the kguudyu uei- 7p:)hch/,y.1wpotential 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 of soo7.duy /h(,sq3k zw 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 o ube8cye qm0tmt1766 a tree. Compare its kinetic energy K, to its potential energy U.0y6m8bm qte 7ut16coe

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 25t c8iv4dkcl car driving up a 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 very heavy object are sliding with equal spa:w: o be3vw uvr/r28,lgkkw( eeds along a level frictionless surface. They both slide upv ua k,:er8:gk2rwl /v(bw 3ow the same frictionless hill. Which 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 s6 ,c2k+/6ijjrwnarf $m_{1}$ 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 conservrp5a3p4vy z9lh wb+6 vative forcesv 9 b4zw6 pr+5pl3ahvy.
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, t 1 zlgg (ekli5+r,l3jyhrough the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the buil zgyr3k (5eil1ljg+,lding?

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 energy. Do noeatl:2x (n4 ry4 slv4ft ignore air resistance.xals4(:f4nrte 4vy l2 How much 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 grfwof pds4lju bw;:. 4,ep3,) mo qbh8ravitational potential energy. Do not igms4) pod,:qffhl,3 o e ;bp4wrj.8wbunore air resistance. How much kinetic energy did the ball gain?

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 conservation of ene hs:o-m dw(zl7rgy.
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 isepus7g07u z7:vy zcva9aa1sl4 h7oq2

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
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 SI t0htw8eg6qi(fz(da;units?

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
40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a uni.i z,(tae5cb vhpnso 80 sx(4pt 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
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times thezra8s8/mz b0 n work in one-third the time. To do so, your power 0sam/ r8zb8znoutput 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 car ace7.zjlwd *kh ,-hpc u3u ;o,nt 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. If the ox 6lj3 ls4ltb0bject weighs 90 N, how much work was done in liftin ljls4t0bx3 6lg 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 corg30hat 4 vwo:nstant velocity of 0.50 m/s. What is the work done by th:ohva0wt43rg e 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 upwar,t+7o i/6vlb p2w zomwd with a constant force of 5500 N for a distance of 50.0 m. What is the work done by bp2w, /o+z6wol7im tv the 5500 N force?

参考答案:    
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 f)yu*afb+vg 1*:v mlyxorce of 5500 N for a distance of 50.0 m. What 1f) + :b*maylxu*g yvvis the work done by the weight of the elevator?

参考答案:    
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 t 1:ty- xuqu+aw7a :hct8o7q apulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the net work d-8:t aahqy1ocwt u7xa7 :tu+qone on 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
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 m1t8el b5wj2 4rn,eld x up along 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 m8jl 1 ,gqj. zndtdfz9u4 m;zy( down a ramp, inclined at $30^{\circ}$ 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:    
标记此题
50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his litn ;)t9juu)2pz g2q2y:lirsa ytle sister Sarah in a sled on an icy surface (assume no friction), with a force 2:;nuag)2rz9yjt)p y2 uq sliof 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 izoh.vd+mp.zam-6 pn c xb7nte8e(g,)n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obj6tm-hpgn(odznmaz.)x e, .+e 8cb7 vpect moves from 0 to 2.0 m.


本题所包含的其它图片:

参考答案:    
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 Fiit odzpb+e14-mfxt 4 )g. 6-1 shows the force versus the object's post4d)i+-b mexftzop14ition. 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
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 force. The graph ine9ni6xpe8u3 m . 4*+njn ft /pbnmnf 1h89rmed Fig. 6-1 shows the force versus then eidrp/m 849 . +nm1txf83*ubefnn enphj69m object's position. Find the 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:    
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
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 insjt x*zf :9(x7fkf/cq Fig. 6-1 shows the force versus the kjtcq7f/(fz* :xsf9 xobject'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 (initiall0of0dz/d vi- 7r y6vefy at rest) across a 10 m level surface. What is the final kinetic energy of the cartd0evz7f-f y d60o/ ivr?

参考答案:    
标记此题
56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force oq- *1kxb4/jag4 ngmmn y mkb,*f 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level su*4* gnn-ybbmm k/mq1, kjax4grface. What is 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 5.0 m/s. How much wo4cmhu7p6jy k*;8kkf r rk is required to stop the mj 76;k4ym*ku prc8k hfass?

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 initially moving at 25 m/s, what distagjz f tjk;:(iqq a-f11nce is required to stop a car moving at 50 m/s under tqqijfkf1t( :jag1;z - he same condition?

参考答案:    
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-+28icdqwr v) 6iwjia0g dart. It is cocked by exerting a force of 20 N over a )+6d ic w20ivjw rai8qdistance 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 component of 80 N and a vertical (yy oyu(6f7wf component of 60 N. The force is applied to a box whiyw(f( u6f oyy7ch rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

参考答案:    
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, striking the ha -j0cogw*97 qwu3t jro v5cs(l/qi1tay with a velocity of gwt u3 c/ oc(* l75va09srq1o- jqtwji60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the 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 mobxp73luj5p(jl e38ayved from a height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential ejx75j8bap euy3pl l3(nergy?

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 inxsvo;3jon +4sclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was donx+s;jvsnoo 34 e 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 h 95bc:om.o2an2oteu0x.q vr spring to stretch 2.0 cm. What is the spring consberxha . c9mq5o 2:v0.notu2o tant?

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 constant of atsfy4qse9 vd8. 4ad( 60 N/m. How much potential energy does it store, wh9.dv(tsq48a4f dea ysen 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 re 90 dlnvvpr7lm0 .en(cquired to compress an initially uncompressed spring with a ev(np.9rnlv0 0 md 7clspring 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 11exu5b ol7bkstretch a spring of spring constant 40 N/m from x = 0.20eo7kbb ux1 l15 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 constant of 15 N/m is initially compressed by 3.0:fm4xi cad; 4 iqwc8z6* f 6xftf4k:yw cm. How much work is require6 i cw4;zc:8f:dw mk6ffx4i4x ta*fyqd to compress the spring an additional 4.0 cm?

参考答案:    
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 from the top of a 50-m high slope.mg 8s)8+s sccj What is the speed of the slier on reaching the bottom of the slope? (Neglcss) 8+js8cgm ect 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 a hd g3vq3t..ck(ik*f sp-ex x- will with an initial speed of 4.0 m/s. Neglecting friction, how fast will shs.tc- w-(iedf* xxk k qp.3v3ge be moving after dropping 10 m in elevation?

参考答案:    
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. At the bo5 xse ,bup/ilu73 1nmzwuc e/dl2w-e*ttom, it has a speed of 9.80 m/s. What is the vertical lpm-e lbn2u w, wi/1xe5zd3u*e/7csuheight 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. ezdvs5*zy-; u4qwt4y When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it movi4 dw5*zz-q usv;y ye4tng?

参考答案:    
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 grounqd,7 3uha x*ee l+yl 4g,bxb4id level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heigh4e,hba4 elxlxu*+g ybq 7i d,3t 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
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. Atv3c sgpi: ul sq*df n4ylve6 e,+56bm0 the highest point in its trajectory, its kinetic eneuise3: l5q y +6sd6mefpvl,vgbc4n0*rgy is 120 J. To what vertical height, 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 above the bottom of a d/ojm1yhpg;w,4ifki m4;/n3uc:vu p vxb7i o 0ip (See Fig. 6-2). pxp ,m;:i 4uf ki;vuicy1n 3jv/0bmhgw 4/ 7ooNeglect 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:

参考答案:    
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 .k zle /xdaw-5oc,u,sv: qes 6m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 3uk/-,6cv: xl.daqewo ,esz s 50 m above the bottom of the dip?


本题所包含的其它图片:

参考答案:    
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 thxp*tkv/ 0v- +(eoxegh e bottom of a dip with a speed of 25 m/ex/hk- ov+g x0*te (vps (See Fig. 6-2). Neglect friction, what will 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
78#
 
  What is the minimum speed of the ballf,b;(nr v ha7:dugs +e( p;uqb at the bottom 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 cnxve)6lmcj n)+qs yf7x z*t7 7m is pulled 30 cm away from the vertical axis and released from rest. What will be its spen 6 j)sl7zxvc)x7t 7+*nmefyqed at the bottom of 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 initially uncompressed ho mgdybx43* 9mss6i6unrizontal spring with spring constant of6ym9sn4ub *x 3i 6mgsd $2.0 \times 10^6 \; N/m$. 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 me 7/ jlglic)-down her 2000 kg car to stop for a red light. Whal/7j) mlicg- et work is done by the friction force against 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 surf gpcio d)cz9 mg2g+ 5(zzdu47hrcsb4 ;ace is 50.0 N. If the inizz454 o7cdmcz9cr; (i ugdps)g+2bg htial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

参考答案:    
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 rough,b r p/;iv lr.nnoi77b) level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.5/oi. lbv77nn rbirp);0 N. 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 mass on a level q k j4d-3fr;mfsurface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved k43qjdrf-f; ma 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 from rest from the top of a 50-m high slope. If theg( gy- +d ;y6rp69i8ffvdhbt u work done by frictg yihyf+d;v6r d6f8g b-up( t9ion 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 plaql32 nbkmuw-i, dlv 70ne. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J o0,2n lwk3 ib-udm7vqlf work to get the box to the top of the plane. 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 plago1o,f 5n1 f6n:tebfk ne inclined at 20e above horizontal. 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 alonn 6 ofe:b1f,f5ok1n gtg 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 fh u8;lygj0s4prom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Wha8hp;04gyj uslt average force of air friction acts on it as 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
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 .ej9t rkyw0r*a flight of stairs 10.0-m h*we9tk r 0.ryjigh, in
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 needmu/ds: zvev 2jk+ :q6hl:zx:ved to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by vu:ev:dq/m: +s2 kzh6:v xlj zthe force?

参考答案:    
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 are used by a 1.0 hp motor that runs for 1 ; / lrwk4n/oep0zgb.v4rpqs ..0 hr? (1 hp = 746q4k/vg0.n ow/br ppz 4l. ers; 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 rate ox jwbjg3k5qf a*d-h6va/p 20mf 500 W while riding. How much force does her foot push with when she isd g6h vmqj3 2*pfax/ 5-kjaw0b 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/s in 7.0 s. What is the averguqnpbed*15cli*9 3 fage power delivered*p1i3f be5n lq9*gdcu 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
    本平台(https://autodiscover.51fly.win/)支持练习，作业与考试(自动评分)三种模式，群组成绩统计排序导出，题目动态变量实现同卷千人千题。
    如果您对本系统感兴趣，想加入我们或者想进行任何形式的合作，请加微信 skysky1258

    试卷内容到此结束!   © 2026 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, 2026-4-18 08:04 , Processed in 0.484265 second(s), 220 queries , Redis On.