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习题练习:Physics Unit5: Circular Motion & Gravitation



 作者: admin   总分: 89分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月20日 23:19  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for an object moving with a constant speed to acce*+e5ww ef;y,rbfo1.tt 6 pnuu lerate? Explain.,ee t1 6w5wy.* fopur; tn+buf

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a particle moving withdkjv:: (aqo+l constant speed such that its acceleration of cons(q kvo +d:aj:ltant magnitude is always perpendicular to its velocity.

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves in a circular path at a cobjk :gk1d c,w 2nzx7a3nstant speed. Compare the direction of the obzc g x n3w1k7bakj2,:dject's velocity and acceleration vectors.

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object experiences uniform circg(vjf.yp2a(si (*, y*( o5j feu elfxyz ona79ular motion, the direction of the acceleration islj(iozf *2sv .x((5efo, eg97ayy(j *afnuyp

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a particle moving with constant speed such that its acceleration mb9 g sc)* qqrr18w6hsof constant magnitude is always perpendicular to its velq6qssrw h*1m )g 9cb8rocity.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What type of acceleration does an object moving with constan1n vo s5c2 4w0hautwsi:zi8f9t speed in a circular path e:c2zt10nwhv58u s wa 4fi9sioxperience?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What force is needed to make )p2 -enpz uw)uan object move in a circle?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object experienb 8:so-z ,kjfg16nicnces uniform circular motion, the direction of the net forco jb-knzf1c6g:8ins, e is

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster car is on a track that forms a circu1*1o.m c rk)vzsq2ww flar loop in the vertical plane. If the car is to just maintain contact with trco )z q2kw1fmwr1 sv*.ack at the top of the loop, what is the minimum value for its centripetal acceleration at this point?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster car rkzh-ujj gt+g5nrfr nc y-838g ; /c7t(mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with th83rkg8c -gncg-tr7hy;ftnzj + 5 j/ure track at the top of the loop, what is the minimum value for its speed at that point?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pilot executes a vertical dive then follows a semi-circular arc un23, ad;szh3 .emfb0pfs. uakl jfh*i7til it is going straightmi7;kbea,j.sfdls 32 f apu. h*0h3fz up. Just as the plane is at its lowest point, the force on him is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coin of mass $m$ rests on a turntable a distance $r$ from the axis of rotation. The turntable rotates with a frequency of $f$. What is the minimum coefficient of static friction between the turntable and the coin if the coin is not to slip?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes around a curve of radiusy(+ ;d o4 m2f ki3gn*z craf6;6ykbtlt $r$ at a constant speed $v$. What is the direction of the net force on the car?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes around a curve of radius8w84uhsydu8 )xv n;yn r at a constant speed v. Then it goes around the same curve at half of the original speed. What is the centripetal force on the car as it goes around the curve for the second time, comparedsv;8nxw u 8 yyh4)udn8 to the first time?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes around a c)xmd zsq5)cvb0s dd k,mf;:(ks. kft:urve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v0s:) k kmbz:.(,s5; )qmdt fcxsvf dkd. What is the centripetal force on the car as it goes around the second curve, compared to the first?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car of mass m goes around a banked curve of radius r withl:lrc:t o /t2wwu3d rcx+cv(5 speed v. If the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on t2 rc/5lx:v3d+utwr clwco: (the car from the road is equal in magnitude to

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two horizontal curves on a bobsled run are ba. j;vue ruu i0/j4 p13h72 oz2xglmeycnked at the same angle, but one has twice the radius of the other. The safe speed (no friction ne1 ejm3zyupgl2x ci4e.2u j;o7uvh 0/reded to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger radius curve?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The banking angle in a turn on the Olympic bobsled track ltv8)j;wsvs - is not constant, but increases upward from the horizontal. Coming around a ;vvwj)slt 8-s turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn. Why do they do this?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for an object moving around a ciryp +hvl+q jjls b,3q)2cular path to have both centripetal and tangen ysjhvqb l+l)qj3p 2+,tial acceleration?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The gravitational fo-n zt,gt*ctkv,75g r vrce between two objects is proportional to

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The gravitational force betweenid pk(b y4h/v m0a: fq3-k7jbs two objects is inversely proportional to

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects attract each other gravitationally. If bleld2j720q t t t(mnw afk7,v3qf;c)the distance between their c2fmkt ldw)eab0;c7v7t ,3 qqnjflt2 (enters is cut in half, the gravitational force

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects, with main4yrg4nr()9 kfnl9osses $m_{1}$ and $m_{2}$, are originally a distance r apart. The gravitational force between them has magnitude F. The second object has its mass changed to 2$m_{2}$, and the distance is changed to r/4. What is the magnitude of the new gravitational force?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects, with masses (b(3)bvmltgj2pzrr 6 $m_{1}$ and $m_{2}$, are originally a distance r apart. The magnitude of the gravitational force between them is F. The masses are changed to 2$m_{1}$ and 2$m_{2}$, and the distance is changed to 4r. What is the magnitude of the new gravitational force?

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25#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Newton's law of universal gravia5c v-5x,l d9x , 1ohck6but1bi we2hxtation.
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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to its mass on the Eart; ;lp*eb/p65a/8 leixxhl qqr h, the mass of an object on the Moon is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The acceleration of gravity on the Moon is one-sixth what it is on Earth. An zc8bo(yoo z1op-la7 8 objec(7o18ola-y bczo 8pz ot of mass
72 kg is taken to the Moon. What is its mass there?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a rocket moves awd :5t bawsthq* u5b44 doa08htay from the Earth's surface, the rocket's weight

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spaceship is travelingsfi4462xckltz 7ba* o to the Moon. At what point is it beyond the pull of Earth's grzblxtoi 2s4*f64 7 ackavity?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a satellite were orbiting the Earth just above th1 6(f,ydd l:ley, daawe surface. What is its centrawfdyd,(6a l e:ldy, 1ipetal acceleration?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hypothetical planet has a mass of halrrw,f.- gwb,do+q9zdt c- 7vlf that of the Earth and a radius of twice that of the Earth. What is the acceleration due to gravity on the planet in terms of g, the acceleration due to grawtzfgowc, 9rd rqv+,b- .l7-dvity at the Earth?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The acceleration of gravity on the Moon is on*:j7 6e5- ehy4cnols vi 6crvde-sixth what it is on Earth. The radius of th c 7-sevecjh r6dy*i6 n:lvo54e Moon is one-fourth that of the Earth. What is the Moon's mass compared to the Earth's?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two planets have the same surface gravity, but planet B has twice the radius of amwf6iyh 5n2/tx k4k( planet A. If planet A has mass m, what is the m2akm h 4ny5/6tf (ikxwass of planet B?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two planets have the same surface gravity, but planet B has tw)4b;pf zgd62hp p,wt gice the mass of planet A. If planet A has radius r, what is the radius of plan 6fp;hd)z4 gpt2, pwgbet B?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a small satellite moving in a circular orbit (radius r) about a sphut mb+9tl bk-h )etel 1 992myd--zvnverical planet (mass M). Which expression gives this s )199 enl-- dye+hl tmv9ubz2m-bkvttatellite's orbital velocity?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Satellite A has twice the mass of satellite B, and rotates5yfq +8 r9iam dt(sp)t in the same orbit. Compare the two satellite's speeds.i+ pmfys8t9rd5 ) (taq

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person is standing on a sca4x3vbxo;7ipqv:f ln 3le in an elevator accelerating downward. Compare the reading on the scale7;:v 43 of 3qvxlxinpb to the person's true weight.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Who was the first person to realize that the planets move in elliptical paths a6xli+z)f vb8 ux bh7f5rolx5hi8xu6f)zb7vb f +und the Sun?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of Halley's Comet, while ;hhe )pq4qtk-traveling in its elliptical orbit around the Sunqpte4)-qh k;h ,

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Let the average orbital radius of a planet be R.e7 j5by5/ga px7x9 mzzw, 7lj c6lsjo* Let the orbital period be T. What quantity is constant for aow5x7b56,jacls jeyz7z/j* 9 lp gm7xll planets orbiting the Sun?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet is discovered 14)d 02k3a mmd* rvbo nc/khncto orbit around a star in the galaxy Andromeda, with the same bkmd3 h12n4/0o nccdmk)rva *orbital diameter as the Earth around our Sun. If that star has 4 times the mass of our Sun, what will the period of revolution of that new planet be, compared to the Earth's orbital period?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The average distance from the Earth to the Sun is defined asvh ;8id9h ox9x one "astronomical unit" (AU). An asteroid orbits the Sun in one-third of a year. What is the asteroid's average distanch vo;98x 9xhdie from the Sun?

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43#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Kepler's laws.bc9chne- xn 77m-qphv +e8r) m
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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  List the four fundamental forces in vkq+i-8s;e lr1rvk ,gl+kgreyi,ii1a) 6; ihnature.

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves with a constant speed of 30 m/s on a circuorzvw)gb )k1,r+* i-k,fp ifj lar track of radius 150 m. What is the acceleratir *+ffiki,o 1)grw )vbjz -kp,on of the object?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The maximum speed around a level curve ije.2v eek:(ies 30.0 km/h. What is the maximum speed around a curve with twice the radius? (Assume all other factors remain uie jee.e: (kv2nchanged.)

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the centripetal accelerc 64;0ukxis*wr2 t5mf1oq (xh /gc neration of a point on the perimeter of a bicycle wheel of diameter 70 cm when rw 65t*ixxm;h c12ks4o rfqcgn( e0/u the bike is moving 8.0 m/s?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point on a wheel rotating at 5.00 rev/s is located 0.200 m pai:k 0 hhz:s2from the axis. What is th:z0 2a:ki phhse centripetal acceleration?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many revolutions per minute musu2c :z4 * ib8hghl(aget a circular, rotating space station of radius 1000 m rotate to produce anhb u8g ez42hg:cli (*a artificial gravity of $9.80 \; m/s^2$?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorcycle has a mass of 250 kg. It goes around a 13.7 m radius turn at +yzml 6a mqi*z(.ur2j ,-2 )zsiauixl96.5 km/h. What is the jrus.*mq -2z z6zli)xmyi a,a (l2iu+centripetal force on the motorcycle?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.50-kg mass is attached to the end of a 1.0-m string. The syste4t5 s :;oqv hc*y2sl)bmqqml8 m is whirled in a horizontal circular path. If the maximum tension that the stri2t4ys*mc ;qohslv qb5q8: l)mng can withstand is 350 N. What is the maximum speed of the mass if the string is not to break?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone, of mass m, is attached to a strong string an y.9b xpvsyugm) 48e.td whirled in a vertical circle of radius r. At the exact top of the path the tension in the string is 3 times the stone's g9s)m4pve .uxty .b8 yweight. The stone's speed at this point is given by

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone, of mass m, is attached to a stronr iwpp(sjc 4,b7,ky w;g string and whirled in a vertical circle of radius r. At the exact bottom of the path the tension inbykiws( 7 pc p,4,wrj; the string is 3 times the stone's weight. The stone's speed at this point is given by

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet plane flying 600qf+jeb5nuf5 - m/s experiences an acceleration of 4g when pulling out of the dive. What is the radius of c+e njbufqf5-5 urvature of the loop in which the plane is flying?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pilot makes an outside vertical loop (in which th.1tq(u/inyz qycuw /9 e center of the loop is beneath him) of radius 3200 m. At the top of his loop he is pushing down on his seat with only one-half of his normal weight. How fas tu /1zwqy/9. i(cnyqut is he going?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The maximum force a pilot can stand is about seven times his weie /uxze (10t-yxl* ogmght. What is the minimum rxg(zml*e u1e0 ty/x-o adius of curvature that a jet plane's pilot, pulling out of a vertical dive, can tolerate at a speed of 250 m/s?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 20 m/s r3l:hwbzp, 4n wud:9kq ounds an 80-m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m? (Assume the same coefficient of friction between the car's tires and each 3q,4u:9n wldpwb kh:zroad surface.)

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car is negotiating a flat c; +.oywqq):ym wpj jl**wwz(lurve of radius 50 m with a speed of 20 m/s. The centripetal force proviy(pq*q l *jw;mwl+w)j.z:ywoded by friction is $1.2 \times 10^{4} \; N$. What is the mass of the car?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes around a flat curve of radius 5 k5vcgjpb(qcg7qdhev3 f 3;96 0 m at a speed of 14 m/s. What must be thep vkc;v ebqgqf39h 3d6 g5j7c( minimum coefficient of friction between the tires and the road for the car to make the turn?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car is moving with a constant speed v around a level curve. The coeffg;6y7h vs(a3:zw jsjivy (w+zicient of friction between the tires anz iwy :sv 7w+(hvgjsj ya(;63zd the road is 0.40. What is the minimum radius of the curve if the car is to stay on the road?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What minimum banking angle is required for anq.rj;l9 aso:wt i/faq95(h om Olympic bobsled to negotiate a 100-m radius turn at 35 m/s wit9jiq9fm/(ta:. hal ; 5w oqroshout skidding? (Ignore friction.)

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal curve on a bobsled run is ban2dxyt-t u0w, aked at a $45^{\circ}$ angle. When a bobsled rounds this curve at the curve's safe speed (no friction needed to stay on the run), what is its centripetal acceleration?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A frictionless curve of radius 100 m, banked at an anglcu vyic 1yb )mcfr+ror.y; 7c z+)bu)0e of $45^{\circ}$, may be safely negotiated at a speed of

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A curve of radius 80 m r :l-db vivj*0is banked at $45^{\circ}$. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the safe speed with which to take the curve without either sliding up or down?

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65#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 175-kg ball on the end of a string is revolving uniformly irdzlz xm -vhlj(5 2.d16 q3rntn a horizontal circle o3 r261(zq d zl -vhlrtmdn.5jxf radius 0.500
m. The ball makes 2.00 revolutions in a second. (only fill in numerial value in the blanks)
(a) Determine the speed of the ball.    $m/s$
(b) Determine the ball's centripetal acceleration.    $m/s^2$
(c) Determine the force a person must exert on opposite end of the string.    $N$

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66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Starting from rest in the pit area, a race car accelerates at a univrw8-epv88(gziy, c uform rate to a speed of 45 m/s in 15 s, moving on a ci8vv e- p8ur8ygwcz (,ircular track of radius 500 m. (only fill in numerical value in the blanks)
(a) Calculate the tangential acceleration.    $m/s^2$
(b) Calculate the radial acceleration when the instantaneous speed is equal to 30 m/s.    $m/s^2$

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The hydrogen atom co7ljlr4ebh g 0kojx2;8 g m0wr7nsists of a proton of mass $1.67 \times 10^{-27} \; kg$ and an orbiting electron of mass $9.11 \times 10^{-31} \; kg$. In one of its orbits, the electron is $5.3 \times 10^{-11} \; m$ from the proton. What is the mutual attractive force between the electron and proton?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the gravitational force on a 70-kg person standing on the Earth, due to xuoz6z )pl7 y/the Moon? The mass of the Moou y 7z6l/)pxozn is $7.36 \times 10^{22} \; kg$ and the distance to the Moon is $3.82 \times 10^{8} \; m$.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The gravitational attractive force+/c09 tcrxh(vbdmy)e: ieh c7 between two masses is F. If the masses are moved to half of their initial distance, what is( bc /cdr tc:mex+v0)hi eh7y9 the gravitational attractive force?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For a spacecraft going from the Earth toward the Sun, tn mk22ry9j26e7dx mgat what distance from the Eaj29 2xk dmrent6gm27yrth will the gravitational forces due to the Sun and the Earth cancel?
Earth's mass: Me = $5.98 \times 10^{24} \; kg$ the Sun's mass: Ms = $1.99 \times 10^{30} \; kg$
Earth-Sun distance: r = $1.50 \times 10^{11} \; m$

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The mass of the Moon i i1w6g07uhoel s $7.4 \times 10^{22} \; kg$ and its mean radius is $1.75 \times 10^{3} \; km$. What is the acceleration due to gravity at the surface of the Moon?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An astronaut goes out for a "space-walk" at a 6z lx; i1mf(op/v.v ya(6bm cydistance above the Earth equal to the radius of the Earth. What i(fm1c .xy yvv6/(l; omp6azbis her acceleration due to gravity?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The radius of the Earth is R. A/hpi24bt/d- ;uc93w w3gihpdqc x c*pt what distance above the Earth's surface will the acceleration of gravity b/hcdbic2hw - gup; tpxwq/4i3c9p d*3e $4.9 \; m/s^2$?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A satellite encircles Mars at a distance abwqp hg e(7.6vh2-(lmhwe:jeqove its surface equal to 3 times the radius of Mars. The accep6 2heq w( g.7qvl(m :hj-ewheleration of gravity of the satellite, as compared to the acceleration of gravity on the surface of Mars, is

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 14000 km from some planet's center, the acc *, c:rgsew.svrg6 ;wjeleration of gravity,*e:g svg jwc; wsr6r. is $32 \; m/s^2$. What is the acceleration of gravity at a point 28000 km from the planet's center?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object weighs 432 N on the surface of the Earth. The Earthzduzsznl.y, 8g0.2 tv7pdzx6 has radius r. If the objecdvtz y27z dlz8z,xn .06. upgst is raised to a height of 3r above the Earth's surface, what is its weight?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  By how many newtons does the weight of a 100-kg person cs:) 5h ai,sazht;s j3ehange when he goes from si:ha5esst 3)hj ;zas, ea level to an altitude of 5000 m? (The mean radius of the Earth is $6.38 \times 10^{6} \; m$.)

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth has radius r. A satellite of mass 100 kg iz+w l(8zw *onal)9 zufs at a point 3r above the Earth's surface. What is wwlnuz89a*+o)lf z z( the satellite's weight?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spherically symmetric planet has four times bdzo-q+r8cn2the Earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of theronzc 28d-qb+ Earth, how much would it weigh on the surface of this planet?

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80#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During a lunar eclipse, the Moon, Earth, and Sun all lie on the same l2ux6jz2bhz *xykfb(46 o zn;e7 utv,wine, with the Earth between the Moon and the Sun. The Moh2y*xe7 u,kwjzub6;246ov(b z nztx fon has a mass of $7.36 \times 10^{22} \; kg$; the Earth has a mass of $5.98 \times 10^{24} \; kg$; and the Sun has a mass of $1.99 \times 10^{30} \; kg$. The separation between the Moon and the Earth is given by $3.84 \times 10^{8} \; m$; the separation between the Earth and the Sun is given by $1.496 \times 10^{11} \; m$.
(a) Calculate the force exerted on the Earth by the Moon, its magnitude is    $\times 10^{20} \; N$, its direction is    the moon.
(b) Calculate the force exerted on the Earth by the Sun, its magnitude is    $\times 10^{22} \; N$, its direction is    the Sun.
(c) Calculate the net force exerted on the Earth by the Moon and the Sun, its magnitude is    $\times 10^{22} \; N$, its direction is    the Sun.

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81#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.10-kg brass ball is tranzo-jp1 qi3 ;udav1p5 isported to the Moon.
(a) Calculate the acceleration due to gravity on the Moon.    $m/s^2$ (The radius of the Moon is $1.74 \times 10^{6} \; m$ and the mass of the Moon is $7.35 \times 10^{22} \; kg$)
(b) Determine the mass of the brass ball on the Earth    $kg$ and on the Moon    $kg$
(c) Determine the weight of the brass ball on the Earth    $N$
(d) Determine the weight of the brass ball on the Moon    $N$

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A satellite is in a low cw v)pb9d6b6r bircular orbit about the Earth (i.e., it just skims the surface rdvb6 )bb9p6w of the Earth). What is the speed of the satellite? (The mean radius of the Earth is $6.38 \times 10^{6} \; m$.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A satellite is in a low circular orbit about the Earth (i.e., it ggf- slvdk30*o+bn 9,uo .rqbjust skims the surface of the Earth). How long does it t-*skg+fl u bd9gv0,3o.qrbon ake to make one revolution around the Earth? (The mean radius of the Earth is $6.38 \times 10^{6} \; m$.)

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A satellite is in circular orbit 230 km0be gvwcos cz 9-+e 1,)3jsgeo)9ipad above the surface of the Earth. It is observed to h -c 01 iw)e oa gp,cejs)3b+de9zgv9osave a period of 89 min. What is the mass of the Earth? (The mean radius of the Earth is $6.38 \times 10^{6} \; m$.)

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Europa, a moon of Jupiter, has an orbital diameteco 2ucb nok+18be m).cr of $1.34 \times 10^{9} \; m$, and a period of 3.55 days. What is the mass of Jupiter?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The innermost moon of Jupiter orbits the planet 8 :v/,l/d kc5dooh5gypw sxt0 with a radius of $422 \times 10^{3} \; km$ and a period of
1.77 days. What is the mass of Jupiter?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two moons orbit a planet in nearly circular orbid*zh4 wy n1:.zdn; iqjts. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to completi;.4 z1wqndj :nyh* dze an orbit?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The planet Jupiter is y)+or4q tq07bqt4k cu$7.78 \times 10^{11} \; m$ from the Sun. How long does it take for Jupiter to orbit once about the Sun? (The distance from the Earth to the Sun is $1.50 \times 10^{11} \; m$.)

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  It takes the planet Jupiter 12 years to orbit the Sun once. Wha8 eym(jh6sl4rav :/lg t is the average distance from Jupiter to the Sun? (The distance from the Eart6 m vjh/lye galsr48:(h to the Sun is $1.5 \times 10^{11} \; m$.)

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