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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 spebzy pltl5f r5 q.z0k91ed to accelerate? Explail59 r5 tlbk0 .zz1fyqpn.

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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 with constant speed such that its acceleration of con3zve :zpdtn.5 stant magnitude is always perpendicularen3vtzz d.5: p 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 constant speed. Compare the dir0 k0zy2a- vkigljp4a cze 8(;nection of the object's velocitypklg kvej(yac i8; n02z0a4 -z 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 experiencesgd)0p7.w d tcdn2ft z(5 misq2 uniform circular motion, the direction of the accelerati.d2qdf0pm 2 ()ind7zcttwgs5on is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a particle movi*7wcz. z3 jj9(jxc osbzl: qy/ng with constant speed such that its acceleration of constant magnitude is always perpendo.sy*z(lcbcz7 z j:9x3jqw/jicular to its velocity.

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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 obxl)qgyspvg)3).6 q cmject moving with constant speed in a circular path experienceg lcy)s6v).q )xgqm 3p?

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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 mahumyg6o1 wn+d/3(ul8oxs2-e5xs ss3g dtl8w ke an 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 experiences uniform circular motion lvf h*30dn elad4zpy1vbxurr 2) 8942k+ sktw, the direction of the net force is40v9 2lbl3d1r2 hu+ 8tapr*dxves k)n4 ywkzf

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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 circular loop in thej9;cok:wc3 cu/t.djh vertical planec:wj uoktd/ jhc39 .c;. If the car is to just maintain contact with track 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 (massn98 ap o7+lyzid35w do = 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 the track at the top of the loop, what i5+aodw d3oiyn8lp7 z9s 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 fc:5sx(gk( ao41 sz)dfr4 dwb lollows a semi-circular arc until it is going straight up. Just as the plane is at its lowest point, the forczwc)g1a( 5dr:l k f b(s4sdx4oe 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 r//,ld 5tziqk oadius $r$ 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 radius r at a constant speed v. Then it goes arounr -qn gvadz5vmt)a88pel1li4c:1 bq)d the same curve at half of the original speed. What is the centripetal force on the car as 5z qnad11) lqr acieg m)bv4-t8lpv8:it goes around the curve for the second time, compared 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 curve of radius r at a constant speed v. Then it t:z3z07yjc7n6ud 7f/xw kwm i goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around thet7m73 xwnd z:zwuiy 6j0/f7 kc 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 banb+;;zar2lz la8mdfl*y;k( fxked curve of radius r with 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 thm 8z; a*k;d+alxf( f;lz lrby2e 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 banked at t;d311 w+u w+dhy,hwx h) lvrkyhe same angle, but one has twice the radius of the other. T1hw1;u kwy ldw h ,)vryxd+h+3he safe speed (no friction needed 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 Oy8,uuk :e rkzrih)ry;iv) .7x lympic bobsled track is not constant, but increases upward from the horizontal. Cominzhy;vkr)e .uxii8, 7 rrk u)y:g around a 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 circular path to have both centr;z(o +y4w zyy. 4smkd wcdxg53ipetal and tangential acceleg+yc zdso 5ww4 d y.4mkz3;(xyration?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The gravitational forto +.rrx vn8eg4wti+.t+d-rc ce 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 between. sj6lpw 9gibuswn7vw 2y(d3 6 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 gravitati hr1yazuj+i k .+2s:neonally. If the distance between their centers izy.: jh u1 ae+2s+iknrs 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 massn.wb / v7mmea)es $m_{1}$ 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 mass nvr1ec(cc+q-4i w15zrh(egu)g* wp res $m_{1}$ 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 gravit w3 h7vk*:y6a;juk aggation.
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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 E i)h) 5(epivboy,g xb:t+jy(9xy e( qgarth, 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-siv9ovjr7o8jjqm8f: qapar*r : )*dbk 4 xth what it is on Earth. An obvo4p*fr8m:ja)b j8* :aoq r qkdr79jvject 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 away from the Earth's su/,c(8l:mj v dk thj(scrface, 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 traveling to the Moon. Atmmgtsbt8 +yfq+*ttd 0;al/4by5wb . t what point is it beyond the pull of Earth's gravitft +*mla5+. g btqby 8mtw;/ts4y0tbdy?

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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 orbsrwp32qpv2 8j iting the Earth just above the surface. What is its centripetal acceler qp r3wjsv228pation?

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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 half that of the Earth and a ra1 uw-t .ao7b-mpglf2fiz; m.ci4rn(:z(nmz xdius of twice that of the Earth. What is the acceleration due to gravity on tig7-b ixf ma4 .lz:p(nz o- .t2wc(fmnz;r m1uhe planet in terms of g, the acceleration due to gravity 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 graviss;kxme0;,/54 vjc 2q-n+ybs m kn.o/ ahs poyty on the Moon is one-sixth what it is on Earth. The radius of the Moon is one-fourth that of the Earth. What is the Moon's mass c h0;k o 2sem 5nkmvpq-n,y4js;bs +a.sc/xy/oompared 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 qc32aejyc re j6wkun 2--v4:yr vi.6 xof planet A. If planet A has mass e2 xv na-cj i:-vq2w6k4c 3uyer6yr.j m, what is the mass 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 a4o;nxeid c jemn9+v3o-;+u e gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of pla u4o9 vei coexa;n+m3jd;en-+net 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 j j:r*( 3b.wt cf0zx(arnsjf- moving in a circular orbit (radius r) about a spherical planet (m:fzw*0bj x rs jc( af-t(r.3njass M). Which expression gives this satellite'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 zylir0 a1l 6g/.:zx 7qflj.cke3u.phsatellite B, and rotates in the same orbit. Compare z 1j:l.piq/fuge ykz l67.lah3c .x0r the two satellite's speeds.

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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 jc6ilr q6-zkb-je7 8mon a scale in an elevator accelerating downward. Compare the reading on the scale to the perm6r8 cjk-l bj qz7ie6-son'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 thej 26bh /pdyzr6 planets move in elliptical paths aroun62 pr 6h/ydbjzd 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 traveling in its elliptical orbit around 9:c goo-.ck lbthe : l-gbko9c.o cSun,

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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. Let the orbital pe8 u6 yu9assamw-e/v g-riod be T. What qua9wye-ug /uvs6-8 a asmntity is constant for all 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 to orbit around a star i,/ )d5jpr)kv-wpydcfeq k 5+n n the galaxy Andromeda, with the same orbitdn +prpdj5 v k w)k/e-cy)5q,fal 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 Eart/gkxm1olqtcqdyu7e 5w.7/ :w h to the Sun is defined as one "astronomical unit" (AU). An asteroid orbits the Sun in one-third of a year. What is the asteroid's average dmwk cu57g wx oqt //:y7e.qdl1istance 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.dy v. 2faxsaq *8d*a9m
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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 natur3r7w .s.u )aemsf ap(oe.

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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 cir4ybh2g)nhebd( , y dk;cular track of radius 150 m.dy b;,)dk2b n(hhgye4 What is the acceleration 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 i. 3p-nhjr8gvhe s :6cjs 30.0 km/h. What is the maximum speed aroune:n p jr v.jg8h6h3-csd a curve with twice the radius? (Assume all other factors remain unchanged.)

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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 acceleration of a lpct z hn(2r;;point on the perimeter of a bicycle wheel of diameter 70 cm when the bike is mon r2t(hcl;;p zving 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 lo/.va8j7p6*e fkey 4mpda br a+cated 0.200 m from the axis. What is the centripetal acceleratioayb8e7 vkrf pm.+p6j/d 4eaa *n?

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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 must a circular, rotating space station of ;mm9uj4cw a9 tradius 1000 m rotate to produce an artifictc m9a u9mj4w;ial 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 g/s pp;;-:vekpbs hk /qoes around a 13.7 m radius turn at 96.5 km/h. What is the centripetal force on the motor;vpsqeh // bk-ksp:p; cycle?

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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 atq0een s3pz21 d6hc ;fvtached to the end of a 1.0-m string. The system is whirled in a horizontal circular path. If the maximum tension that the string can withstand is 350 N. What is the maximum speed 1vef phnq0dczes3;26 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 and whirled in a vertica 7v (vq4sg/9a4e(szpc 8r4npkgbh.kynnc1i9 l circle of radius r. At the exact top of the path the tension in the string is 3 times e49n1c cspnrnsbg k(vv zh 7 (gkp48q9iy 4.a/the stone's weight. 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 attashf 3or(b0nz/ v- -nuhched to a strong string and whirled in a vertical circle of radius r. At the exact bottom of the path the tension in thbvzs/hn3nfu(- o r 0-he 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 600 m/s experiences an a qn wxah:xego (jp9/ -p55mi,xcceleration of 4g when pulling out of the dive. What is the radius of curvature of the loop in which the plix9( j o hw/xx55- npegm,:aqpane 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 t(b)o3wvkt 4pqow -pn;he 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 3 ;p(bwpw 4ovq-kont) his normal weight. How fast 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 weightl :l*ih;m j (t(rnbj054g2voclqi)b k . What is the minimum radius of jk;j*bibtr(0c 5) i2 ohqnmv 4ll(:glcurvature 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 rounds an 80-m radius horizontal curve with me );xn8vzvom(l0a94 )u v2jgr omeq*bj yu :+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 betw:yeo) 4+0gmj2u ;zql *x(avou )j8 b9vrvnmemeen the car's tires and each road 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 curve of radius 50 m with a speed of 20 m/s. The cenaj)) t,eexp4e6,u vr oysa 4t6tripetal force provided by frict s,eata p,yu6vo)rx4te4 6 )ejion 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 radifa-1yn4q z 9btcvd r1gy- +yz4us 50 m at a speed of 14 m/s. What must be the minimum coeffi1nzry9-tgcd a f+y-bqzy41 v4 cient 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. Thewh5 t/vf j3 c4lkcf;qi+3pxj 5 coefficient of friction betq j5kfi+pf53 v3l;j/ hwx c4ctween the tires and 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 m,uac l w/62ayifr-z/v.n:k e for an Olympic bobsled to negotiate a 100-m radius turn at 35 m/s without skiddi /kar:-. u /cmze 2fliy,v6nawng? (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 bo dc-;btxw/o-l bsled run is banked 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, b 6ch kp(8vncu9anked at an angle 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 is banked atpv );zwd)1vsn $45^{\circ}$. 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 lh55i6vre0, byy qz 7iof a string is revolving uniformly in a horizontal circle of radius hivy60zle5 57r ,q biy0.500
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 x) qb :6iy60 dbp0(qycsm bva.area, a race car accelerates at a uniform rate to a speed of 45 m/s in 15 s, moving on a circular track of radius 500 m. (only fill in numericv6bp aqdsiy0b y.:( cb q06)xmal 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 consists of a p(fo xs(bbftz k4p/u/- roton 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 oald1136j2 vw c ga;wht1 dah62vol1jw3gcwa ;he Moon? The mass of the Moon 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 between two masses is F. If the mhnt- )1o mu(uxx (pv6kt)wp62m:macoasses are moved to half of thtk6-:wpa) 2xv (t(muuco16)nox m mpheir initial distance, what is 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 Se 49 0ni h(9:x/fxewpczei+ idun, at what distance from the Earth will the gravitational forces due to the Sun andi: /diep 9cex+( fwnh0z9iex4 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 m72hjuuz )k)he* qa;zis $7.4 \times 10^{22} \; kg$ 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-waoaouh45 nwsrm/ 5bipox x5 37zr,9(ar lk" at a distance above the Earth equal to the radius of the Earth. What is her accosz(5wmboor5 h/ix 7,xrn rp 4a39au5eleration 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. At wzhggtnkb6 0k(r * )6*yl n;iknhat distance above the Earth's surface will thb6tn(k* 0;r in6zlkg nh)*ky ge acceleration of gravity be $4.9 \; m/s^2$?

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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 above its suxi l9f n;)x4riom * 0l xfi.whp6j4-tjrface equal to 3 times the radius of Mars. The acceleration of gravity of the satellite, as compared to the acceleration of gravity on the surface of Marwx*. xj)m-tfn4li 4 ;l6x jh9ii opf0rs, 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 kf f/* i --ubf1c51unzp c,p5z7mrikf km from some planet's center, the acceleration of gravity is f*i1p7k1kc-z pzn bf-5fr/m u c5u f,i$32 \; m/s^2$. 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 Earth has radius r. If w0o4i) sffjz(the object is raised to a height oz) jwf(si f40of 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 wg e-p7 .vjjhug.,heyehm7 -4geight of a 100-kg person change when he goes from sea. -mpeyh.e7ggejvu 4hg7h,j - 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 1di-jr 9k 7pyb4l id8:i00 kg is at a point 3r above the Earth's surface. What is ry-kp:ij4i8ld d9i 7b 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 the Earth'ww5rav0o m-1rpt xe /t6r x56os mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the Earth, how muchrxr0w t16tp-5awmox/65 eor v 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 thv *:us *7xd:eezjpgki69 vs, ze same line, with the Earth between t :* ,z6x:7kv9*gj esidzpv suehe Moon and the Sun. The Moon 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 transport*dfm,/w1cfevqz: (qe:h sm ) hed 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 cichtrn f3qps 29dq*i)2r*h io 0rcular orbit about the Earth (i.e., it just skims the surface of the Earth). What is the speed of the satellit0h3p*o2s dihrntq *r 2q9c f)ie? (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 Earr. z-)a0ee*u w8 qq fk(k/m vkupvbg2k/m+k*mth (i.e., it just skims the sue8f.bmvk a0/ +mp ku2kgr/)* evk zkqmq(*wu-rface of the Earth). How long does it take 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 2b.x3+2 3wg dm zbmkq/z30 km above the surface of the Earth. It is observed to have a period of 89 min. What is the mass of the Earth? (The mean radius of the Ea3 q xz3 gbm./kzmb+2wdrth 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 Ju) )yj6.-y7w wss1u7jwfs a8 xggzb8c xpiter, has an orbital diameter 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 p5v( bh m6 poq3he-wje0lanet 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 circulatmn o7uo6xwjmu07h)tx:a .- w ay q(o2r orbits. 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 complete an orox-a(uau h x)wotj 6mm:no.7t y0w72qbit?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The planet Jupiter i0+1s(wqvslh+szxp8(pzkl -8zw 7h h cs $7.78 \times 10^{11} \; m$ 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. e*7wi egjt y.g yi( 1p,lr:iy;What is the average distance from Jupiter to the Sun? (The:(1 ipyye w.gljigityr 7*,e; distance from the Earth to the Sun is $1.5 \times 10^{11} \; m$.)

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