97.01: A force F directed at an angle of θ above the horizontal is used to pula)96 k0p:epzfd yeark*zdrwx6i f :8/l a crate / ezk*6 69:ra 8d ):wapz0ifedrxpykfa 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 m)ykf:kn miip zh,z.f. 0vn/i/oving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back.hm n fnvypkf /k/zii. iz),:0 a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3na+g(tv8c tbay* jptgy/;r xx 8l(4.i meter above the floo(c nij.8g/r* 8xt;a al(4gt v+bp xtyyr for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accezwtyjdgv.tofb1f 24-a3 il/4leration on a horizontal surface v4lgbt -fy t2a / i.jfz3wo41dfor 5.00 s. The block’s kinetic 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 acceleration on a honf; f xv*wf:1irizontal surface for 5.00 s. The block’s kinetic energy strictly dfx;i 1 f*wfn:vecreases 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 3.0aa( om 5zb-ez,qz31sofvli.6x+ xu-y kg block for 5.0 s. The block was initially at rest and slides on a horizontal suz,1omauya.zo- bixlx -3ef vs+(z6 q5rface.
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 rip.;tvz22smf8nd /9 gpczvom f:-job/81 rz okght is exerted on a 3.0 kg block for 5.0.2poc9;do:tgzj-o m1vb/ms2 zf n8rf zk/8 pv s. The block was initially at rest and slides 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 frozen6n5q0n2 w ftjha4.ketzdl0x; pond throws a 1 kg hammer in one direction. After the thr 604;lhzwdat 5.ext2k0n jqnfow, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after+y kdu v44rbr5 the fan hasbd5u4 +vrkyr4 been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5,tqq 0(2-dlafdall f 9s1kro( 0 kg has a position of 3.0 m, a speed of 4.0 m/s, f 1d (sk ,fqdlall(a02q-tor9 and 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 4 cb f41:lohbvon the middle shelf in the bookroom 1.3 m from the floor. If the janitor f4c1o v h:4blbrelocates the box to the shelf that is 2.6 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 horsmh8/sv 1f nd *oax/ju7epower) of powerja8nmshfu7x 1/vod */ 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 the retarding force acting on the car?

  09.13: In the figure to the right, a box moves w sgl3k9r*xe7 yith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of tlksgy9 3x*er7 he 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 theqldq1j z +34qm right, a box moves with speed 5.00 m/s at the bottom of a rough, 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 of F = 240N. The box, 43q zqdl q1+mjof 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 resn jpqo 07ryf7 v;4c*qof*mkm mu,,cs)t, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what imfqf4 ynp;,0qjm*kcs*), o rc um7ov7 s its speed in terms of B?

  12.07: What is the net force actinf-s 9yleww /(t4t1cn m3is1usg on the object during the time interval of the accelerye 1w4wm3lcs f-s(/ni19sut tation?

  12.08: Through what distancl,l cbc8 sv9u:cod;3osic 9j; d e1zc)e does the object move during the time interval of the acceleratic loi 9slz;;ud3c )co8 dcbvjse:c9,1on

  12.19: The magnitude of the l / rhe hp:po)iej4mj-1qnhm(rd8c5 u-inear momentum of a 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 is the change in the kinetic energy of the mr jim4jr5(po1nh8em - ) :hu-pqh/cdeass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its (*b6s9 fko pg:uhct 2gspeed is increased from 2.00m6 :f *9b oghsgu(tkc2p/s to 4.00m/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 hork)h9 pn,)e of+a1gasoizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcaspaasg1n) 9he)+o, f oke is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usee u)ucw7bwl l,:5s-q sful power output of 0.10 w to raise a block vertically at a constant speed. At wh7ew lls:q,u5 w- sbu)cat constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfac ki j c.1jmh7ym2ex:,ge of the 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 force acting on the Earth by the 1.00 kg object during the fall jekh c,m:i172gjmx. y?

  96.18: A rubber ball is held motionless a height ho abovb t141yb c0tu/y3vp ylr80j wde a hard floor and released. Assu4v1w3 ryubyjlt/ dyct10bp8 0 ming 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 height h above the surface?

  07.06: A 500-kg car is moving at 2p;3k0kss27;2j of:xxo;e70 vqznsdc egy2tc8 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minjo 2q3s; 70 ss7e2fgxokkntv0zpx 2;eccy; :dimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 mw0.w5 xhw0 bht/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was0xhw.h05tbw w coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical h a7nnqne28e4 8ktctkv ;(z g1kinetic energies and the three following statements. Which of the above statementh(zng2tecan1kqv88e k; 7 n 4ts 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 ver1ymg5kwz3wvkv /f 1:hu5ij8 t tically in the air with an initial speed of 4.60 m/s. Ignhvij5w1w: ky/ 3u1fktv g8 zm5oring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from restq5ya;ivy-c44b+0 pi4 hh uq pw straight upward from a flat, stationary 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 the boy’ b5 cw 4h4yi4i-;pqqv a 0u+phys feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground.h bs/-oeifw1; 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 magnitude of the average constant force exero/1ehb sf-;iwted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The objec64ie r5se/-.tk oatcrt bounces off of a horizontal surface in a collision lasting tit5i /e r-k4scao.e t6rme 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 pul u6,q/iizla+t6l sdk -dd, m5hwz0w o/led sideways until the cord makes an ,56qt- l0wwzzh+/6m ,a dokdiuild/s 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. The slej p/aa8i,z uu/od6 ,uxd, which started at the bottom of the inclineia,od8zj/ u, a6/uupx moving at 10.0 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 from*2:mp3bnb 4 plaw4thwph2 r/vcu3 vy( the sidewalk, along a 10-meter ramp topump 3wp(b2h2rc4hv3a4wnl*vy bt: / 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 the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied *w vl(q z3r*frfor 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 represents the 3z*r*(qrlfw v work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls Ab ca tc, ,q6q88fu8txx and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the m 868,8xccqtxu taq f,bechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initiaq,7ubn2mf9j asxo. 6 ,i;ey cnl 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 straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above th,7.aeq2 6jfni9;xcm ,s nybo ue launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constfwe6tn3:e 8 ieant of 20 N/m. The potential energy storint 3ee:e68f wed in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wh:sd +pxtu:7eud3io z-at is the maximum speed it can impart to a 2.0-kg obje -+edzxstp:od u ui:73ct ?

  

  10.31: An object of mass M stslq:o ,1r -sqjeom(odq ,q0(n7 ,exd oarts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the inclin ln(q7q:ode1d- qxq0eo,o(,sro, smje 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.