97.01: A force F directed at an angle of θ above the horizontal is used to pubaajecf1k3 0x4)jvp *ll ab0*cv4e j)a akpjf3 x1 crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towar g70m+ ,oluhlq80h *c4nvomy z9a/cnld her with horizontal speed v. While bringing the ball to rest, her hand moves back a d0zm/v aq hn9ulohyl,40m*+8c7n glocistanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds /tdi5ar9fe bz7* upi4j: g;s7ubi+era 20 kilogram sheet of wallboard 3 meter above the floor for 4 ud fb7 rg*49;7r5ep u:i /sziei+jta bseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal po9rhc(uw;qnl +z 24ksurface for 5.00 s. The block’s kine+h2pkcru 4o ;9qz(lnwtic energy strictly decreases from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform accelerlxv+vwr60m(b b o2l2ration on a horizontal surface for 5.00 s. The block’s kinetic eneb( mw r6lr+lvb2oxv 20rgy 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 3.0j 74frsrbhb( 1 .eyw3d kg block for 37brh4f 1e.r(bjsd yw5.0 s. The block was initially at rest and slides on a horizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directed to the right is exerted7*jc),b ihcmr on a 3.0 kg block for 5.0 s. The block was initially at rest and slidesr i,b7c *hc)mj on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond throws a 1 kgx f-q.vql:h9k mo 7)am hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situati m:.mql9 xa-kq )hfo7von?

  03.14: A fan blows the air ankkj v:k +,nen03 91pmd/usqb nd gives it kinetic energy. An hour after the fanmkj +s1vkqd0be9/n:pk3n u n, has been turned off,
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 spnoo m9fwp3)(jeed of 4.0 m/s, and an accel39p(jmon fwo) eration 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 she1 (6;ev)pbijn cw ib c8mm1ou*lf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is nv)wcbup8 c1 emmbi(6o; 1 i*j2.6 m from the floor, how much work 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 horsepower) of powe 57vh8ei. bq 1g tg g8dzk8xson)4x)fer to a car's driving whee 41etexn.5g) ) 8v gxz7f8hsko b8iqdgls. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves witgim(1lk+s o6 q1d5vr7j6dhw qh speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleqv 5+m6hdjso67q 1rwg(i kld1ration 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 moves with speed 5.00 m/s at the d fu0du r0dv. 7tc3. :mb8zqgrbottom of a rough, fixed inclined plane. The boxq .u00f.trudzg7b cdv d:8 mr3 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 right, each starting from rest, alongu-au84 :s3dcbhln - hn a straight road. CarA has twice the acceleration of Car B. After traveling a dist nsc: b8nu-3 -duhalh4ance 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 o(: +gbdp* n c78ncfzrjbject during the time interval of the ac*g(dnp z c:87n+frcjbceleration?

  12.08: Through what distance does the object mo;ni;zb1 5yv0qioc 0xbvu1 nl 9ve during the time interval of the 0;clz1b v1yb90 5ounx iqiv;nacceleration

  12.19: The magnitude of the linear momentum of a 7cftlsf2 c: 4j;t0vbv 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What icbtcv t2v4 j;0f:l7 fss the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speths+ m .)u/ekted is increased from 2.00m/s to u)+k.s/tthe m4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy 5k frlw fo*y9 zt85q7ysuitcase of weight mga distance d along a level floor at constantt9 8 5*frwlfqoyk7y5z velocity. The coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward kqsyn28 -vmb2force and delivers a useful power output of 0.10 w to raise a block vertinm q s22y8kvb-cally 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 th 0o*7l1xgh 7nn.wd nsqe Earth, the gravitational force acting 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 wdnhg1sx.7n*0q 7 no lforce acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hacj) l3wim9x-ord floor and released. Assuming that the collision with the floor is elastic, which onem-) ci3wjo 9lx of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver seawn13.qe;xpnzr2uc(m xfl+ 2es a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum;zcx+ 2u f 3.perxmn2(wnql1 a average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 mhn gzf,e--x8cqg6 4p g/s slows down uniformly until it stops. If the ball travels 15 meters, whaqnc, g zfe- -h864pgxgt was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory caug m 60/j-xixy21neacrts of different masses but identical kinetic en2n-uaxjy0c 6m/ie1gx ergies and the three following statements. Which of the above statements 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 of clay is tossed vertically in the air with an initial sp,81egi/zh dlo )5/ plci-cf peeed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ene8p,e1z/pi h5il/cceg)- oldf rgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, *kh iz e 9xsqtw x/y7n.xmdw1i4)d0/mstationary 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 h1 m )wiz/x/ q0.im*d 4khyt9n7xxs dewighest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the grwq6b cw 1*td)gound. 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 negligible, what is the magni6g 1 wqdcbw*t)tude 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 from aheight Hqbnmf//7jrk(8 b- aks)z rf8x d ewj(4 above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upwara( k4/r)b n8wq8jdkj- xrbz e/s7(m ffd 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 pss pt4f/-mg0cscdlf7hsk: 7 -ulled sideways until the cord fhg 7c/7ksf:smlsc-d0t p -s4makes an angle
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 angle. Themg;mt r;/1ya s sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above it/ tm1;rgmas;y s 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 from the side5r/ faz7. wxpswalk, 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 by thew ar/szfx75. p deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force yxo-n ka+fk )jkfu4*9F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best +*9a4fnyuj-) fokk kxrepresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A an1mxth 6ka; rv/d B are each dropped from rest from the top of a tall tower. Ball tkrh6xa/1;vmA is dropped one second 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 M straight upw- gq /dn9mbde)hmt (,vnm8qx.ard with an initial non-zero speed v. The omhn ,.(q)qx8t/nmm-d9vd ge bbject rises to a maximum height H above the launch point. The person now throws an object of mass 0.5M straight 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 cons/ qy54ni6ah0 pp;8p devp bfp5tant of 20 N/m. The potential 0a/y4;ef p565inpqvh p pd8pb energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum speay0uog(pmt dq gj wm ./:(8lb6ed it can impart to a 2mg w8(:/yq0du t lbg(ao.pmj6.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclrr c1dxa0rl) .fk3 c+xine of height H. A person decides to push the object 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 coeff1daf3r c.c rl 0rxkx)+icient of kinetic friction between the incline and the object for both trials.