97.01: A force F directedag jy tw cow-yw*7d*n*5d)0 qc at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the forceqy7 a*cy*-*c wj5)tgdw now0d F is

  97.33: A softball player catches a ball of mass m, which is movinhevj1nqc9-r:teq 1 r5fj1 h+kg toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hr ke1rh-h1vjqq+ e tf9:nj5c1and is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter if/xb dmb,)x4 twj.x4above thew xf bdj/ixmt4,x) .4b floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontahyk1 )x i 9l2fgubr5o*ccbf -/l surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J i*i/fou21h-gbb)ccf y9x kl5rn this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sl jdv,b.ps ;ya8i71 wozides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energodjpyz; w1,. 7 v8isbay strictly decreases from 50.0 J to 20.0 J in this time.
Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

  16.11: A 12.0 N net force directed to the right is exerted on a 3.0 kg blo fv cpt4v 83*ciw.bp2 j3ymqf8ck for 5.0 s. The block was initially at rest and slides on a horizonta4w 3jvi. 3fyqmpb v2t8cp8c *fl surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force dici p.g3c,dmtx1g t dl;3(nab)rected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surg txnc3.t 1c)bdg i;dlmp,3a(face.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen p n)oq;dsi.fa4b9 c*a rond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the othe* ;f.4 nd)qo9rsa acbir direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energye r 1hn* mb:evf)/cpobw1o*hn,v 3rg0. An hour after the fan has been turned ofm 0w n1/e3g*)f pv,n:o*hvbcr1rhoebf,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, a - c tnqis944b6-m rc s;4ek wtv5a)thespeed of 4.0 m/s, awvt t6)5ce9hr ta 4-4;kb-ie s4sqnc mnd an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the book*/mvgrkt/ rd/3g-io xroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much workg ivtr// g*orx dm-/k3 does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 hors:dh*0g o k;+(+ laf ymzb*miqmepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of tz ml+*+kgb0a;* :(mfhiymd qo he retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s atbd.lurl,3a5 q the bottom of a roughal.,l35qb rud, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right, a box movacph7f wu) ytn;6ew, ,)iu6/n3tf/a u z 1pwvxes with speed 5.00 m/s at the bottom of a rough, fixe 1)/wnahx yzw p63 c7u;n),,uatfvufep6w i/td inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the v)o+eggz4 -wp right, each starting from rest, along a straight road. CarA has twice the acceleration of Cag+w- z4p)gve or B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object durinc b(w*g )uxvd)f/mq*xg the time interval of thvu*xdgb(fq c))x *m w/e acceleration?

  12.08: Through what distance does the oe6rs- ( 6 vuakn;tl.qvbject move during the time interval of the ack;. s 66rqt-aen(uvv lceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg rl(/:1upl ec nq/vcv 1point mass is changed from 6.p/lrn1 cvl:(/ euv 1qc00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 )bkjcri7+.q 0qau. k +vqku4chx pl4vc. ,yv6 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the k0c6+)qcq j v7k y.cvxbv4 r.u,aki+ qluhp4 .mass of the crate

  94.38: A force F at an angle θ above the horizontal is used tzi c8y018nk rdo pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of frictiydnk808 z i1cron between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts anv rz 4/s8qgpu0 upward force and delivers a useful power output of 0.10 8g/ zspuqr0v 4w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth 5 4j2j8t z*zxmzqd9 5biofs:x, the gravitational force acti:5fq2z*t 98m5xo4 x zdj szijbng on the 1.00 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 mto the ground, which one of the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held mo bgxu,81 j 9bok+vg 4)4fxrnwod9+n chtionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball and its heightgn n 989g jdx4 vkb+u,cf wro4b1+ohx) h above the surface?

  07.06: A 500-kg car iu*:pm44ti cx ws moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude pi*utcxw:m44of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 12g i.ng.6ii0z kb vpe*5 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while 2vnp6e.g*.b i igz 0ikit was coming to a stop?

  02.26: Consider two laboratory carts of different f.51u 5 npllzo -z*cccmasses but identical kinetic energies and the three following statements. Which of the above statemenpcl*cfc 5nl 1o5zuz.-ts would be correct?
I. The one with the greatest mass has the greatest momentum
II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop

  06.19: A 60.0-kgball of7vj p)bh my 7 8w+ryr6wp-mv(e clay is tossed vertically in the air with an initial speed y 7w)jm mr8ybv+pwr h(- 7pev6of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationc) zkju 5l28+8huijtyary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the highest point of the motion. How much physical work did the average normal force of contact (N) between ku)i jh8ct85 +2 jzluythe boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is drop:4h m4,efthizped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligibleeih4:fhm zt4 ,, what is the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped frg 6 dap5bo 34r-ehl6srom aheight H above the ground. The object bounces off of a horizontald 54o-66ersh 3pb rgal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What was the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways unt 5g( qe,:hgyzail the cord makes an ,ea: 5hyg(gzqangle
θ with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:

  03.49: A sled slides up a uniform incline of unknown do c01v/rji/g)jshz( dyy lq/q/*v b +xi3 n2tangle. The sled, which started at the bottom of the incline moving at 1 /bvyls30d+nc o1yijg/xhj// (irqvqz* d)t20.0 m/s, rises to a height of 3.30 m above its starting position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons fr7 nxd p;3q4d3ynasyz:om the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done byyz d d73pn43:nxs;aq y the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant foen 5ii;)i0 xgkwng s(po6rw9 4rce F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The massp sr 4g)nx9w60 ne5;(iioikg w of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from res: xj5:kzpt vcut)c0 ;m:h hqi(t from the top of a tall tower. Ball A is dropped one s 5uvhpqc )k(t ;z0jxct: ::ihmecond before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass mscfnllgpf(ab*n0x9b s+0js8 4pv6 .M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an object of mass 0.5M strv9 j slam bppnf(s.0xn8 f0bs cl6+*4gaight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring conswo i++:sknr6/rk2 mt r (ww-dmtant of 20 N/m. The potential energy stored in the spring -/ ikr k62+:ortnmw+ mswwr (dis:

  97.10: A compressed spring has 16 J of potenti/g+pd/lal d +gal energy. What is the maximum speed itd/g+ ldpgl+/a can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fng(u, 4 qpxic/08 vt7amw mi/v9dua7w ixed incline of height H. A person decides to push the o m7avvd9a480u xwpn(,wgi/mi7q t/c u bject up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.