题库网 (tiku.one)

 找回密码
 立即注册

 

      

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 Unit4: Force Dynamics & Newton's Laws



 作者: admin   总分: 85分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月20日 11:44  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  
  Which of Newton's laws best explains why motorists should buckyizzn+z xe7)5-lbc 1 1l7+hoo t 2tmyfle-up?

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  
  When you sit on a chair, the resultant force on6k duac(sv4m9 you is

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  
  In the absence of an external force, a moving objecfl3. h9sh,8bs viti0 ft will

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  
  When the rocket engines on the starship NO-PAIN-NO-GAIz st1tz7s3 dc)2yrl8 zN are suddenly turned off, while trave8dy2rt1lszc szzt 7)3ling in empty space, the starship will

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  
  A rocket moves through empty space in a straight linzo hi1hi oy-n6- 5/igxe with constant speed. It is far from tghoyi65x/i-nz oh1i-he gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion 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  
  You are standing in a movivq3gdid* 40qqng bus, facing forward, and you suddenly fall forward. You can imply from thigdv4i30dq qq*s that the bus's

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  
  You are standing in 0hhnx(so (h:va moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused yvhohs(x:n0h (ou to fall forward?

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  
  A constant net force acts on an object. De1x c0yez*6 3mdvsg(pc9n519 eywy4hvijktl) scribe the motion of the object.

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 acceleration of an.k wold-83 nsgrwv v*x9 ohz.6gzoz95 object is inversely proportional to

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  
  A net force F accelerates a mass m with an acceleration6v70 v;i j5a -4jcbknzzw6 rhylit8:g a. If the same net force is applied to mass 2m, thtl6c:-4v7hzbgkriz8w0 5 jvany;i j6en the acceleration will be

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  
  A net force F acts on a mass m and produces an acceleration ).(uxptcmmfn :b9 mi- a. What acceleration res-cxm f.)9t:(ump bimnults if a net force 2F acts on mass 4m?

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 you blow up a balloon, and then release it, the balloon wiuj/l9axg ( n0dyskrs/e; 3p ,kll fly away. This is an illud0eyuk (sp/sgx3j r,;9nl/ak stration of

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  
  Two cars collide head-on. * b:wfj,8as0n hu0cwbAt every moment during the collision, the magnitude of the force the first car exe08 wcj:,a 0 nuhb*sbfwrts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

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 you exert a force F on an ow*je gu yi)n 4:0qlmd3bject, the force which the object exerts on you wil:qn) yelm* id0j gu34wl

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  
  Action-reaction force;1 od0dvfrv z;mq5vxh;fb.e )s

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  
  Action-reaction forcess 84/7+mt sc idjtj38vqxigv5esh-3 d are

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  
  A 20-ton truck collides with a 1500-lb car and causes a lnprou90q 0 80a,lkz7 5f5 vkw2x hsxjyot of damage to the car. Sinc sku8 jxk lr00 znhw,9ox57ypaf02q5ve a lot of damage is done on the car

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  
  An object of mass m sits on a flat tabledku++a* edwf8b ck +w1. The Earth pulls on this object with force mg, which1++ dw 8ak* e+ukdfwcb we will call the action force. What is the reaction force?

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 child's toy is suspended from the ceil/ y h azob0bgfmtin3) b),x+;hing by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "re;b z3x)m/ yohbn)thf+gba ,i0action force"?

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  
  Your bat hits the ball pitched to you with a 1500-N in:fk6 ifr*q:pir )d/lg stantaneous force. The ball hits the bat wi6 /f: fiq*k)l :prrgidth an instantaneous force, whose magnitude is

参考答案:    

标记此题
21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Newton's three lagc3onmcc +c:vx+kewp,-* k g9m2zq3 ews.
参考答案:    

标记此题
22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Mass and weight

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 acceleration due to gravity is lower on the i rs,n12wcvp./ ch kc j-xcd0.Moon than on Earth. Which of the following is true about the mass and weight of an astrokpsxcinj.hc-,0dc /2cvw1 r. naut on the Moon's surface, compared to Earth?

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  
  An example of a force which acts at a dz e +hmai ngmp186u4))em)odnistance 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  
  Who has a greater weight to mass ratio, a person weighing 400 q7hh08 su0y-ya ):c gtkak5nrN or a person weighhykt8 :nkg-)s yaau0r qc0h 57ing 600 N?

参考答案:    

标记此题
26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown straight up. At the top of its path, the 2cp8b ;9)ler+t8zocex)l ybtnet force acting on it i8y8 bxpbet)+ce9 ;t)l corl2z s

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 20-N weight and a 5.0-N weight are dropped simultaneously from the same kxsm ssl8/bv*n) 7 if/7.pr soheight. Ignore air resistance. Compare their s /)m8 ip/7soxb.nvs r7sf*lkaccelerations.

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  
  A brick and a feather fall to the earth at their respective terminal veloc4q w0l:iy/k dtities. Which object expd ql4: w/tkiy0eriences the greater force of air friction?

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 object of mass m is hanging by a stm-*fy r4sze f yq79y0rring from the ceiling of an elevator. The elevator is moving up at constant speed. What is the tension r ym-zq9ysf y* ef70r4in the string?

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  
  An object of mass m is hanging by a string from the ceiling of aniuz1xa --l;h(7xisn 2 j-nvlf uk, *on elevator. The elevator is moving upward, but slowing down. Wh kuxn(uli1olzv-2xn -hin -,s*;7aj fat is the tension in the string?

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  
  The force that keeps you from sliding on an icy sidewalkmh1 :5kav da6c is

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  
  It's more difficult to s-uho1 umyz f/f07 *lnctart moving a heavy carton from rest than it is to keep push7fm-f/*uh 1 u0yolzcning it with constant velocity, because

参考答案:    

标记此题
33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force accelerates a box from rest across rshodk 4qy ,:9apa(e91l qh(sa horizontal surface (friction is present) at a constant rate. The experiment is rhq ds(e1 h(q asl,9kp4r:9oayepeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

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 packing crate slides down an inclined ramp at constant bmqwwm9fpk4i ;u5+ b(velocity. Thus we can dqmw(5m+ ib;9pw4ku fbeduce that

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 block of mass M slides down a frictionless plane inclined 6n.f6qbe sj-6eqwm u- at an angle q with the horizontal. The no -.f6 -j qwqen6be6musrmal reaction force exerted by the plane on the block is

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 block of mass M slides down a frlc niwd ().a+eictionless plane inclined at an angle q with the horizontal. The normal reaction force exerted by the plaei(w .+ldanc )ne on the block is directed

参考答案:    

标记此题
37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of mass M slides down a frictionless pvvjyi( tw*081 bmgqz2u sm(,klane inclined at an angle q with the horizontal. The gru8m 1wm(0q b(tvk* szjgy v,2iavitational force is directed

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  
  Two toy cars (16 kg and 2.0 kg) are released simultaneously on an inclined pli:mp (a91r fja*u ww0sane that makes an angle a9wiu(af0m 1s p:r w*jof 30e with the horizontal. Make a statement which best describes their acceleration after being released.

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  
  An object sits on a frictionless surface. A 16-N forcew zs6 4i+,hhxb is applied to the object, and it accelerate+, hsw 46xzibhs at $2.0 \; m/s^2$. What is the mass of the object?

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  
  A sports car of mass 1000 kg can accelerate from rest to 27 m/f2z;. .wr.x civ5lo -nt+u +ci4ak 5lwhr xkj9s in 7.0 s. What is the average forward forchkjilurt +9ow 5frxc.c5.vxik .-l+; 2 4wznae on the car?

参考答案:    

标记此题
41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Starting from rest, a 4.0-kg body reaches a speed b4i- a,7*xo xbsu3ipqh( r ae(of 8.0 m/s in 2.0 s. What is the net force acting on the bod bq(*3-bxuioe ipa(7a4r s,hxy?

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  
  An antitank weapon fires a 3 8bscq 8 (hox72pe;bwq.00-kg rocket which acquires a speed of 50.0 m/s after w2;op bq e8b(hxqs7 8ctraveling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

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  
  If you push a 4.0-kg mass with the same force that you s zhme7 l u6pv7zo/ci4t6i.i)push a 10-kg mass from restic/ ip utzvo6z7se.m7h)6l4i ,

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  
  What is the mass of a phb :xf64a l :5iohlc.uerson who weighs 110 lb?

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  
  What is the mass of an object that weighs 250 N on the 4,s50 a5yodqahtfmy:m:wf q y(n8 e6g surface of the Earth where the acceleration due to gravityo qyd5( g 06fys hnm8m wtqfa:y,a54e: is $9.80 \; m/s^2$?

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  
  An object has a mass of 60 kg on the Earth. What is the meki12arb v1ejip8.7 ;nbbtq 9 ass of the object on the surface of the Moon where the acceleration due to gravity is only 1/6 of t eq.;1bb91k 2 pr8btvni7aijehat on the Earth?

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  
  Object A weighs 40 N on Earth, and obje84y9 sq uac-rxbx(fm5wx5 rl* ct B weighs 40 N on the Moon. The Moon's gravity is one sixth of Earth's. Co xrwqlf4xr(5a5*98u cx-bm sympare the masses of the objects.

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  
  Sue and Sean are having a t 9ab ngki*hz,1ug-of-war by pulling on opposite ends of a 5.0-kg rope. Sue pulls with a 15-N force. What is Sean's force if the rope accelgb*hz ,k 19naierates toward Sue at $2.0 \; m/s^2$?

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 stack of books rests on a level frictionless surf:.ag9pt gm oj(*vc)m face. A force F acts on the stack, and it a 9a. m(gg)cv:fpt o*mjccelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

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  
  A person of weight 480 N stands on a smwas l :(hz539 i4thqwcale in an elevator. What will the scale be reading when the : it45w zl9hq(3swhma elevator is accelerating downward at $4.00 \; m/s^2$?

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 person on a scale rides in an elevator. If the mass of the p4w(tp w(w9otm bui+m39f3 ypc )of k:nerson is 60.0 kg and the elevator accelerates downwapw9b 3mwfto9w+34i(ufynpm tc o) k( :rd with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

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 person on a scale rideyao (mgsbxt9g 2x /c1e4w,4gns in an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward with an acy4mb, 9s1e gawgcox4xt/ g(n2celeration of $4.90 \; m/s^2$, what is the reading on the scale?

参考答案:    

标记此题
53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two horizontal forces act on a 5.0-kg mass. One forci,g7ziomp u7cboc i 3n9+ j4d,e has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of t74cnc,+3oib, 7zm9jpuoigid he mass?

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  
  An object of mass 6000 kg rests on the flatbed of a truck. It is held3j-fv9pwb;o9cxx 8d s in place by metal brackets that can exert a maximum 9bd8 p-ofx3jws c9;xv horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

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  
  An object of mass 6000 kg rests on the flatgal c 3kb7*htwb n1 -(kfq*:zhbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward int bk az*l1fc( *-h3tnb:hwq7kgo the cab?

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  
  In the Atwood machine shown in 2u.y qu0ds (evFig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore fri (20 ved.uyusqction and the mass of the pulley.)


本题所包含的其它图片:

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  
  In the Atwood machine shown in Fig.626 mve. xv-tifdesk5 4-1, if M = 0.60 kg and m = 0.40 kg, what is the tension in them5. svfvi 6xed 6-k2te string? (Ignore friction and the mass of the pulley.)


本题所包含的其它图片:

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  
  A student pulls a box of books on a smooth horizontal floor with a 83zz*tutmje v6n )(i mforce of 100 6(mvu3in*tte8) zmj zN in a direction 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?

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 student pulls a box of books on a smooth horizonteuc5y,qe t-f 6 vj-hy. 1len4+du2empal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass ofeh1n yye 4+ld-ev5qufe2,.p -u c 6tjm the box and the books is 40.0 kg, what is the normal force on the box?

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 traffic light of weight 100 N is supported by two ropes as8kz2y 7 v lmgdf1o16si shown in Fig. 4-2. s 7dfy2mv8lioz1 k g16 What are the tensions in the ropes?


本题所包含的其它图片:

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  
  In Fig. 4-2, if the tensions in the ropes cw-y e zvn:3h(are 50 N, what is the mass of the traffic li -ny3h:( vezwcght?


本题所包含的其它图片:

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  
  Two boxes of masses m and 2m are in contact with each oth-gu0 c/z 6os60ea rylqer on a frictionless surface. (See Fig. 4-3.)a/s -lgq rz0oc066 yeu What is the acceleration of the more massive box?


本题所包含的其它图片:

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  
  Two boxes of masses m and 2m are in contact with each other on a frictg 5hy9 j+dixz,ionless surface. (See Fig. 4-3.) What is the n,h9 5gy+xdjiz et force on the more massive box?


本题所包含的其它图片:

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  
  Two boxes of masses m and 2m are co y:mb)d m;r/nmnnected by a rope. (See Fig. 4-4.) If the forward form m bdm:y)/n;rce on the more massive box is F, what is the tension in the connecting rope?


本题所包含的其它图片:

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  
  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If zw: o/b 8f3b) t v9dz6z1rodmithe forward force on the more massive box is F, what is the accelz:3dd/im) 8z9 oz r1vfb6wbtoeration of the less massive box?


本题所包含的其它图片:

参考答案:    

标记此题
66#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two boxes are connected by g ou,xfs6mi.ulm+0o ;a cord running over a pulley as shown in Fig. 4-5. Box I of u0 ;6lgom xsmufio+. ,mass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

本题所包含的其它图片:

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  
  The coefficient of static and kinetic frictiyt(3zu,jhwboj)h xkg kn0 h,7-1p oe;. blv4ions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the netbt y 0o hepv ko(-74,jhin.hk1,b uz)gj;wl3x force on the box when a 15 N horizontal force is applied to the box?

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  
  The coefficients of static and kinetic frictions for plzr, ru(c.:w*kfy1pli3iyubv ,z0g( 6 sim5ns astic on wood are 0.50 and 0.40,rwr i, ynumik,gsy15busf(:i *3.zz(6 p 0lcv
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

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  
  An object slides on a level surface in the +x direction. col ;ht1iieb;jle l*tafm5;a 9 4.6ylIt slows and comes to a stop with a constant accelerai.aeijh*9tt1cb5le;l ; la f6y4ol;m tion of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

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 10-kg box sitting on a horizontal surface is pulled b+v s:z sag8vb3-z3cx fy a 5.0-N force. A 3.0-N friction force3gzcvs:v a 8f+ -bx3zs retards the motion. What is the acceleration of the object?

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  
  A horizontal force of 5.0 N accelerates a 4.0-kg mass, frfxfl01dpq 2a7lga +g) om rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

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  
  During a hockey game, a puck;3m dl(a xluk3q*do2k is given an initial speed of 10 m/s. It slides 50 m on the ice before it stops. What is the coefficd omu*( l;l3q3kxa2 kdient of kinetic friction between the puck and the ice?

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  
  During the investigation of a traffic accident, police find skid mrztabl)8a:q d5499n hb qp*yjarks 90.0 m long. They determine the coefficient of friction between the car's tirez*n:qj9 a94 yptd r)5qbla8bh s and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

参考答案:    

标记此题
74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two boxes of masses m nvpjv+m7 a r5 .0g3frxand 3m are stacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does mr7 f0vrnx5.g3+ pjva not slide on the more massive box, what is the static friction force on the less massive box?


本题所包含的其它图片:

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  
  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) zof a +lk.q pjto -*bq,fq/97tThe surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static fricto j pt *qz7/fk-,qabqlo+t. 9fion between the boxes?


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  
  An object is on a frictionless inclined plane. The plane s6(ilp 7y wzi*5avflsm;-q 0h is inclined at an angle y z(*slpqi0 lms5 v;a76wfhi-of $30^{\circ}$ with the horizontal. What is the object's acceleration?

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 10-kg mass slides down a flat hill that makes an angle o5oq8 y yce0x2siqpq:g k 6p0g3f $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

参考答案:    

标记此题
78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass is placed on a smooth inc uv0:f-g obut3; j)kbelined plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

参考答案:    

标记此题
79#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A block lies on a smooth inclined planeb r2 iz 5)9ptfiroq6:f tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?
参考答案:    

标记此题
80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wooden block slides directly down an inclohx v(zs5.9ed ined plane, at a constant velocity of 6.0 meh95z( sxv. do/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

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  
  An object with a mases88c *kxg e)y)m )pzzs m slides down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

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  
  An object with a mass m slideslfrl),j/jp(1k0 j i ee down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

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 bulldozer drags a lgexcf+ h;f3: eog weighing 500 N along a rough surface. The cable attached to the lo fe3eg;:+ fcxhg makes an angle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

参考答案:    

标记此题
84#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A 25.0-kg box is released frommi4kg. znfx9 x71 q5qm rest on a rough inclined plane tilted at an angleg57x9q1mn4zfx ik .qm of $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.
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  
  An object is placed on an inclined plane.ylj:gwl(vjwn 33*r :2q5 veip The angle of incline is gradually increased until the objejwlv :33:q yp jlv 2n*greiw5(ct begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?

参考答案:    

  • :
  • 总分:85分 及格:51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 85 道题
    本系统支持习题练习,作业与考试三大模式,作业考试自动评分,成绩排序一键导出,可设定动态变量同一试卷千人千题
    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

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2024-11-22 06:08 , Processed in 0.442885 second(s), 191 queries , Redis On.