97.01: A force F directed at anpszj /11khp0 r angle of θ above the horizontal is used to pull a crate ap1 j1hks0r/zp distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a h2cs g z btjg9pxc41-o0 h-7pjball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distt- g jozc14g phh290- s7bxcjpanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet ofc(mtgy(k (nr7 5v2xbw wallboard 3 meter above the floor for 4 seco mw (7y g((5cvkb2rtnxnds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizi8im1h/c u/ ctontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20itcui1 c/h8/m.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 acceleratif +6az9q3 2xeova naw2on on a horizontal surow9 ae22zx+a 6vq3fnaface for 5.00 s. The block’s kinetic energy 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 ozjnfucbrb7. y(/m60an a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sur/mz6b7 rjubfc(an .y0face.
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 tvqmjtl2e3*tch h9 3 z8he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal z*ltmt2 9 jhqc3v eh83surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initial u*4-fs anjcy3m-exy- ly at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one xncyj-my*s43-u f- ae 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. An1dpf 9oko+xv t,ib f1ujzg))w9-4 pxx hour after the fan has been tu+)1g)9 p9xfu1xipjw,-v tzfoxok b4drned 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 spe 1 0gta3o,vuiajr1( 5tc9g bpded of 4.0 m/s, av,gpa5i9o0dugrc1 1 3(atjt bnd 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 midz-k.kefmr w5ptj(5* e ozz. c;dle shelf in the bookroom 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 work does he do on the box. Th5erpkm f;zck(.jz-z. w5o * tee box has a mass of 10.0 kg.

  02.32: An automobile engine delivemli ovr. d01c+)af4j urs 24,000 watts (about 32 horsepower) 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 the retarding force acting o1iam dru 0.lv fo)jc+4n the car?

  09.13: In the figure to the right, a box moves w*hn an)bxz wj(lxm6*+u 3l1kecr( zp:ith 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 rx3 ba(el1mnz (xn k*)lpjzw6hu+c*: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 t xw.+ysxz2cf aq1b7o5:y 1rbxhe bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is bezb15cxyw+ .bqy x7s :2roax1fing 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, along a straigh9.o67xv g/u;fk hnbmctch n.4*l-h us t road. CarA has twice the acceleration of Car B. After traveling a distanclchtogbn6c* .vxu. uk7;49 / shfh-nme 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 du7t xeci1 d;.7 hxslwn4ring the time interval of the accel;s l n4 ie7txc1h7.dwxeration?

  12.08: Through what distance 3 4xlool/2q wedoes the object move during the time interval of the acceleratione/ o324 lqlowx

  12.19: The magnitude of the linear momentum of a ou)1;lne aa6z4.00 kg point mass is changed from 6.00kg1)a6 zole;anu .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 J of kinetic energy while its speed is increased fg2dydtg(l/+at gvf 9jt,gd ckk8 ezgb7 5 n-5.rom 2.00m/s to 4.00m/s. Which one of th-v gn/8d9k. 7f da ggeg(2bc yjl,t+d5tgztk5e following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usegr1j k/cuc ;**cc 6hvxd 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 suitcasevgcxj6c*ch /*k ; 1rcu is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usexmt)qo01f ba*n4u p0e ful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raisemq14a t0)xof0eunb * p a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface o)whqxd,( zl nsmwhg 16,)oibf)zy nrg1 b99,sf 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 followiw9b(q69 z1sfdln ))g bghmihxwrz)y 1s ,on,,ng 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 motionless a height ho above8+apgy tm8otlf4(5ac)zau s3 a hard floor and released. Assuming that the collision with4s lgpc)maoa58y+(t8 a3zut f 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 28 m/s. The driver sees a barrier ahead. Ibt5 :w(1shteos,)md ef the car takes ed o5)s e:1bhs,(mttw 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stok)xw0ntc a/g8ps. If the ball travels 15 meters, what was the average net force appt nxk wag/)80clied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetiw z*rty + 1 jb.9vyqq0t)4ldp cgd(m/jc energies and the three following statements. Which of t j 4w(l9qd z qgyt b.ctpmj)*/d10+vyrhe 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 vertic, p6y9d zwmd5v htr l;dt3zc)e*rh/w em31.kbally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy 6)bddpzhr m 3r*zw3t/ t5d.mc; hw,9k1yvlee when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary cjp 35ta x-uz1woncrete 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) beu5j1x z-t pa3wtween the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheinkz8kst3/orm 6y 6f0n ghtH above the ground. The object crashes into some soft earth and comes to restn3osm6f /06tk k8zry n by compressing the earth a distance of H/2. Assuming that air resistance is negligible, 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 from aheight H above the ground. Theh7ad:-yshb*f8qo* nr object bounces off of a horizontal fy:d8nqrh** o7s h ab-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 sidem,(:vvdvc53 jh0qj0pv 7uq rqways until the cord h j: 0q,(v7vpv35djru0 vmqqc makes 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. bcq ,ev)c ,dg*vq:/ih The sled, which started at the bottom of the incline 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 hed cbi,*v:/q)g,c vqof the hill?

  06.09: A deliveryman movesj4i vc65vsjnvj6d(nj l/ r; .i 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1..6c ir n6j;jjn4 vji 5dl/svv(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 zl/oic5(0m xt shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass o l0 icz(tm5x/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 uep) t020k hvk -u21m: hsaueseach dropped from rest from the top of a tall tower. Ball A is dropped ones0u 2 hhaesuue :k-tp 0vm)1k2 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 Mfu fev(h7t :5j 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 obje7 hf(:t e5fjvuct 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 stretcb6na 1*dc4.mv 3qd kxrhes a spring that has a spring constant of 20 N/m. The potential energy storm ca v3*nd1k.r6qdb4xed in the spring is:

  97.10: A compressed spring has 16 J of p.cam.xqhw (e;otential energy. What is the maximum speed it can impart to a 2.0-kg objectxcwqa.( .mh e; ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of 6v nyyt3je m+ iyez)x+,.rs9cheight y3n .)se vyetr6 jxc y9zm++i,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 coefficient of kinetic friction between the incline and the object for both trials.