97.01: A force F directed at an angle of θ above the horizontal is used to p/m)-ml j f ycja/os)(a 3g9 +kzpzvt-hull a crate a distance D across a level floor. The work done by the for m(lkz9h+3paasvf/jy/-o) tgc )mzj-ce F is

  97.33: A softball player catches a ball of mass m, which is moving towao7r- g6d+mn5/syfqb gpi0, rnrd her with horizontal speed v. While bringing the ball 7sb+/fon q rg-r 56dgyin ,0pmto rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructiog-q/qd f 7i2sun laborer holds a 20 kilogram sheet of wallboard 3 meter abovesg/du- qf7qi2 the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sz3 apmuh2nj/l, gxqf pl o971f6;mzu 3lides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enerp/mnax6 19ju3m,fp lu7hzzl; 3gfoq2 gy 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 acce07w;lb lzawd k,p 9skza; qe4:leration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20a e;d,:z l0kwpls;wb79k az4 q.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 b8 qy/ d1j6e9exahupv -lock for 5.0 s. The block was initially at rest and slides on a horizontal surface.yp ex8/a1u-ehd 6qv9j
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directdyiham*k772q 7;)x a q.okduned to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and ok7iund a*7xy2 kd hq;7mq a.)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 frozen pond thc5g3v-p6rwjzy )qn 4e rows a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Whg-jwc)5 34ryze n 6pqvich of the following correctly describes the above situation?

  03.14: A fan blows the air and.tk + *3o maoqddak4q2 gives it kinetic energy. An hour after the fan has been tkm.2 kqd +ata4*od3q ourned 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.v2a 4 arol r99w.waqa60bh:um0 m, a speed of 4.0 m/s, and an accelera9h luom9.a64w w: rab0q2aravtion of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooksoaj/: tt:q(y q 4oich )jp/7tv is on the middle shelf in the bookroom 1.3 m from the floor. If the janit:v4/:tjht qoti p)qao(y/cj7or relocates 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 56hxes) jzmxyl*d(l8 engine delivers 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 on th5x h e6sydm)l jxz8(l*e car?

  09.13: In the figure to thecc (srfhi: e62 right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelerati2 ehr( :cifcs6on 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 bon+ bre33n), lhjnd gmh o*ln2+x moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the to3 h+n,3 dg2ojbl)n+rn e* lnhmp 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 sta5*ekx hkpn 100ze(ajarting from rest, along a straight r (0z*0aex1 p5kh akenjoad. 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 is its speed in terms of B?

  12.07: What is the net force acting on the object during the time i.(unh u qn1*td8m3av2vnm8b vd43jwonterval of the acceleratnd vu1*n3q. 2wvma8u bon j (h84dt3vmion?

  12.08: Through what disxj( *ppfs,1f stance does the object move during the time interval of the accsfx1(*p sf,jpeleration

  12.19: The magnitude of the linear momentum of -.zea hukfq9s*lvv6x3r1 ch(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 kinetick6 3z 1-q.u cehvv*fras9(lxh energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased fra)8zxb jz, st)om 2.00m/s to 4.00m/s. Which one of the ft xaz8, b)js)zollowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is useddq 4p1:wlh/bf; 4azfv to pull a heavy suitcase of weighha : p4/d41b vzf;qlwft mga distance d along a level floor at constant 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 force and delivers a useful power oua63fyihip8 a ;9ytr: 6fq qe-qtput of 0.10 w to raisr: ;py6e 8f3 i9ihaf6qqat qy-e 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 objecte(7i -uf,wg m uvd;ie5l2l7 nx is released from rest near the surface 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 fallwengld,e m7;u 7( ifi lu52x-vs 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 heldvlrm*i5;) lnc j.jo3n motionless 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 shol)n n clv 5jmjr3;*i.ows 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 barre7mh0vokvb904q*w 8ko)curhaw5 r m ; ier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average nc4uhe mqvwv7oa*5bmkr k) ho0r; 89 0wet force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly un*;ujgqhvfnu,ku-a rc1:5 o i0til it stops. If the ball travels 15 meters, what was 50,qnu- krfch1vjugi;o:a u*the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differmdg( :m5-nufw/vkl.hy s q-p+ ent masses but identical kinetic energies and the three following statements. Which of tmnqvpymu: /5+ ks.fw glh-d-(he 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 3yn)zndw l;7zclay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistancn;lz 7ywz3)n de, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward v 0 5ip4pnam. ty:6lxwfrom 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 (m.plnwv5t0 aiy64px:N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped y ;:ded4 vkw3gfrom aheightH above the ground. The object crashes into some soft earth and comes to rest by compreveykg:wd4 ; d3ssing 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 isryi k8j +dirtl5g 59+x dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time+ r j8+k9 iixdtry5gl5 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 bob2 (ohd2to ytgzr +r 0sb:u4e;v,:exxa mass mon a cord length L is pulled sideways until the cord mt:ve u t r2rhs+exzbo,2g;dyo:a4 0x(akes 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. The sled, which g zk/v;0 .1fh hfsp0hrstarted at the bottom of th00pg1 ;sr fkzhhvhf./e 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 of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, a66p 1ft8 gpg ujfvr/e6long 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 totalf8/et6p66gj rgv1 ufp 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 thcn ;l gz/lze6,.a.ja we 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 represents the work done 6j.alnzeaz. wl ;g/,cby the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rel:hrv- /pdk;lv3o 0g gst 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 mecha3lp vg:kvrd- o/0hgl ;nical energies of the two balls changing?

  11.28: A person throws an object of mass M straigh9m .,s inx pz()pv (zkvt4y-gslc93g qt upward with an initial non-zero speed v. The object rises to a maximum heigs9 ((3qks ),m-zzcxyp g 4p9vg.itn vlht 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 au) -b)bnc3)un/eosje/eq6 2ai 8ar m t spring that has a spring constant of 20 N/m. The pr ))3bjo b)u -e/c6nmatasie8/2uenq otential energy stored in the spring is:

  97.10: A compressed spring has 16 J of ;irwl0tw :gc7 ff5j7 nl6um 2xpotential energy. What is the maximum speed it can impart to a 2.0-kg objec0wxfct r5funl jm:l27 ;g7iw 6t ?

  

  10.31: An object of mass M starts from rest at the bottom of a fdmpp,i w-+8o 9vjoz/gixed incline 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 mgov,ppo z+jiw98/ -dwould 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.