95.02: An object shown in the accompanying figure moves in uniform ci;)ksm2wd pzq lqhc9-6 rcular motion. Which arrow best depicts the net force acting on the object at the instant shown? wk; 2hq q- 9l6dpmzcs)

  05.31: A child is belted into a Ferris Wheel t( *drr :qyc8hym:n9iseat that rotates counterclockwise at constant speed at an amusement park. At the location shown, which direction best represents the total force exerted onn(ry di89ht*qr c:my : the child by the seat and belt?

  08.14: A particle continuously moves in a cqcux :5w25fup/w f1l *hrsj )yircular path at constant speed in a counter- clockwise direction. Consider a time c51x uus5:* f ryfw)jwql/h2p interval during which the particle moves along this circular path from point P to point Q. Point Q is exactly half-way around the circle from Point P.
What is the direction of the average velocity during this time interval?

  08.15: A particle continuously moves in a )( tt(u(gxdk7sswz h4rlac:y ;q 0, qycircular path at constant speed in a counter- clockwise direction. Consider a time interval during whizuy t07(ksrycth(gd:q4;( xla)w,qs ch the particle moves along this circular path from point P to point Q. Point Q is exactly half-way around the circle from Point P.
What is the direction of the average acceleration during this time interval?

  15.07: An object moves clockwise with constant speed around the vertical ci5dlp 85 g6nocrghykq8z2s,r, rcle s,8sg qp6rkd, ny5oh 82lgr 5zchown. Which arrow best indicates the direction of the object’s instantaneous
acceleration at the point labeled X?

  12.11: A girl twirls a small mass conf::5r uasspb +kdae ..nected to the end of a string counterclockwise in a horizontal circle above her head. The figure shows an outline of the mass’s path viewed from above the twirling mass. If the girl needs the mass to pass through the point labed :b+.:esr.fa5kaus p led P in the figure, at which lettered point on the path should she let go of the string?

  15.23: A car moves with constant speed around a horseshoe-shaped path as sh5oj(6 cxo k8btown with the arrowsjcx5(t86bo ko in the figure. Which one of the following choices best describes the direction of the average acceleration of the car in traveling from Wto X?

  08.35: Astronauts on the Moon perform an experiment with a simple pendulum thbw-+4mm 9d(jak3 ck+am hdbf,at is released from the horizond+,bkfa- wb(mh 4j+md 3mc ka9tal position at rest. At the moment shown in the diagram with $0^{\circ} < \theta < 90^{\circ}$ , the total acceleration of the mass may be directed in which of the following ways?

  03.19: A heavy (2.0 kg) point-like object restsuv-fdr1s (pxh4 u 1/tf 2.0m from the center of a rough turntable as the turntable rotates. The period of the turntable's rotation is 5.0 seconds. The coefficient of kinetic friction between the object and turntable is 0.50, while the coeffici(ptsuf 14 /-dhu1x vfrent of static friction is 0.80. What is the magnitude of the force of friction acting on the object?

  07.19: What net force is n3ss *y*1sa tcx -mm0mvecessary to keep a 1. 0 kg puck moving in a circle of radius 0.5 m on a horizontal frictionless surfac-s tss**mx13 ym0 vcame with a speed of 2.0 m/s?

  05.03: What is the centripetk5iwfwztd kl28:7u o7al acceleration of an object (mass = 50 g) on the end of an 80 l:kfwzui725 ok8tdw7-cm string rotating at a constant rate of 4 times a second?

  09.24: A point mass moves along adhyn d3.)k drj 7 9xqxnq,04yz horizontal circular path of radius 0.8m with a constant kinetic energy of 128J. What is th.xz 4 y,d9h3)0jdq ynd rn7qxke magnitude of the net force acting on the mass as it moves?

  96.24: A 2.0-kg ball is attached 2.l u amg1;ktrto a 0.80 m string and whirled in a horizontal circle at a constant speed of 6.0 m/s. See figure to the right. Th2au; .tm k1lrge work done on the ball during each revolution is:

  99.22: A child whirls a ball at the end of a rope, in a uniform circu/8yczc2 8y1dk dl/0 lp bre 7uwn20higlar motion. Which2 br8 p0k07y8 2uwz/ygcdih/ e1ncdl l of the following statements is NOT true?

  00.19: An astronaut in an orbiting space craft attaches a maspbg,gq57z4ck2la r 4 bs m to a string and whir b4p 4l5a,gbcz72q krgls it around in uniform circular motion. The radius of the circle is r, the speed of the mass is v, and the tension in the string is F. If the mass, radius, and speed were all to double the tension required to maintain uniform circular motion would be

  07.22: A mass m is pgf :x0t gn/ kk0k5vdr5mbr:j /ulled outward until the string of length L to which it is attached makes a 90- degree angle with the vertical. The mass is released from rest and swings through a circular arc. What is the tension in the string whtf:xg jnr0/5km b: kg5k/dr0ven the mass swings through the bottom ofthe arc?

  94.15: A car is traveling on a +1o rw-r 2( sesdaz5enroad in hilly terrain, see figure to the right. Assume the car has speed v and the tops and bottoms of the hills have radius of curvature R. T-zas wn5+er es rd2(o1he driver of the car is most likely to feel weightless:

  17.10: A 2000 kg car moves over a hill at a constant speed of 12.0 m/s. At the v 3e1n,18/wgkulq5c mz we 9mbaery top of the hill, the shape of the road can be approximated as a circle with radius 25 m, as indicated in the figure. Which one of the following choices best represents the magnitude of the upward force exerted by the road on the car? 5 m9 ub 31w/,gaeqewl1kncm8z

  97.13: A small sphere is moving i7xssvma7vc qms; 1ei71x7 w+ an a vertical circle at constant speed. The magnitude of thevwv1xs q;e7+7ma1x7 c7s sami net force on the sphere

  11.47: A simple pendulum of length Lhasa point mass M released cc)6sn qkop e664*ivtfrom rest from the horizontal position shown. In the absence of air resistance and friction, the mass swings through the arc of a circle. Let T represent the magnitude of the force from the string on the mass (tension), G represent the magnitude of the gravitational force acting on the mass by the earth, and F represent the magnitude of the net force acting on the mass. Which one of the following choices describes the relationship among these forces when iccsq 6npe* ok v6)46tthe mass swings at the bottom of the arc (point P)?

  16.32: A mass connected to a string forms a simple pendulum. The mass is releas;qu1(ci c77 jx+f0dqn kx 8s7zatvh9sed from rest and undergoes simple harmonic motion. Which one of the following choices correctly ranks the magnitude of the tension in the string (T), the gravitational force on the mass (W), and the net force acting on the mass (F) when the zsjcd9tcuvi; h 178+k f70xs7x a(qn qmass swings through its lowest point?

  04.41: A centripetal forcwj, r wp::w2 osxpna.*e of 5.0 newtons is applied to a rubber stopper moving at a constant speed in a horizontal circle. If the same force is applied, but the radius is made smaller, what happens to the speed v, and the frequency f, of tpsxpnw,:ww.a*o 2rj :he stopper?

  05.28: A mass, M, is at rygka e.s0qx 4d5l4g /hest on a frictionless surface, connected to an ideal horizontal spring that is upstretched. A person exten .g5glq4 ey4s0 /dkaxhds the spring 30 cm from equilibrium and holds it at this location by applying a 10 N force. The spring is brought back to equilibrium and the mass connected to it is now doubled to 2M. If the spring is extended back 30 cm from equilibrium, what is the necessary force applied by the person to hold the mass stationary there?

  12.22: A girl swings a 4.0 kg mass with a constant speed of5/qadbainkl jc-s6*xb 01la ) 3.24 m/s in a vertically-oriented kibl5s ql-n)a a1*d0 6/cbaj xcircle of radius 0.75 m. What is the net force acting on the mass when it is at the lowest point of the circle?

  14.23:Two small identical coins (labeled X andY) are at r nlceg+u:2 fw +q)/ffio+, fczeston a horizontal disk rotating at a constant rate aqeu ,wgf)ln+z2 +/ff ofi c:c+bout an axis perpendicular to the plane of the disk and through its center. The distance of the coins from the center of disk is related by $d_x=\frac{1}{2}d_x$. Which one of the following choices correctly identifies the relationship between $f_x$and $f_y$ , the frictional force on coin X and on coin Y, respectively?

  15.40: A 2.0 kg mass is connected to the end of string and moves about the str 1kmhyyh ny9f663q1wg ing’s fixed end in a conical motion with a constant spyh6yw 61qhnk 1yf93gmeed of 4.0 m/s. The string has a length of 2.50 m and forms an angle of $θ$ with the vertical. What is the tension in the string?

  17.26: A 4.00 kg mass is intvpwsrv-(qi9 ,i sf7ve5m(fi2 p9v /k uniform circular motion as shown in the figure. The string to which the mass is attached hasvpfp7wr-s2 eqi(vim t,fsv5k( i 9 /9v a length of L = 3.00 m and forms an angle of $θ=50^{\circ}$with the vertical. What is the speed of the mass?

  13.23: A small object of mass 11.0g is at res d +3du ;eb (vcst*).2eeprzxbt 30.0 cm from a horizontal disk’s c*(;pzcb3 d)te.ex+ vd e 2sburenter. The disk starts to rotate from rest about its center with a constant angular acceleration of $4.50 rad/s^{2}$ . What is the magnitude of the net force acting on the object after a time of t=1/3 s if the object remains at rest with respect to the disk?

  10.35 A point object with mass M = 2.0 kg is attached as,csye.6 2, flpnae p6 distance R =1.75 m from the fixed center of a disk as shown in tl6,pea csy.6 2nspfe ,he figure. The disk starts rotating from rest with constant angular acceleration $α =5.00 rad/s^{2}$ about an axis perpendicular to the plane of the page through the disk’s center. After how much time (in seconds) is the tangential component of the point object’s acceleration equal in magnitude to the centripetal component of the point object’s acceleration?

  16.39: An object moves in a circle, starting 30yydwx e,, llp3x:y8d,st td at the top, with initial speed 17.0 m/s. The object’s speed increases uniformly , x: w l8x33,sydd0yp,lydt etuntil it has moved counterclockwise through an angle of$55^{\circ}$. The average acceleration for this motion is $9.8 m/s^{2}$directed straight downward.
What is the final speed of the object?

  16.40: An object moves in a circle, starting ayv9iy 7 rz-+ bu5jrl/av81klpt the top, with initial speed 17.0 m/s. The 7yklr5arbij u8yp /vl +zv1-9object’s speed increases uniformly until it has moved counterclockwise through an angle of$55^{\circ}$. The average acceleration for this motion is $9.8 m/s^{2}$directed straight downward.
What is the time for this motion?

  17.38: A small 2.0 kg block rests at the bottom of a bucrolv6dro x lk*;xnw j22h-, b7ket. The bucket is spun in a vertical circle of radius L by a rope. When the bucket reaches the highest point in its motion, it moves just fast enough for the block to remain in 6b2,wvrkj -r72dn;xl *oxh lo place in the bucket. When the bucket is at an angle $θ=30^{\circ}$from the vertical, as seen in the figure, what is the magnitude of the normal force (perpendicular to the surface) provided by the bucket onto the block? Note that the direction of the gravitational field is indicated in the diagram byand that the block does not touch any sides of the bucket aside from the bottom of it.