97.01: A force F directed at an angle of θ above the horizonltvs1 2sw;.a( h7ezzav k7o27 kfc2obtal is used to pull a crate a distance D across 2l ko 2;wv1aste.(s7k7z facvh2 7 boza level floor. The work done by the force F is

  97.33: A softball player catche mjna(5kp n1:en j)+hcs a ball of mass m, which is moving 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 he hmen(njn5k:j1+ac)p r hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter abol*1fpyo:xsbp 99 dggy f vt;50ve the floor for 4 seconds. During these 4 secondshow fpo*:s y b x5gpf1lt;0d99vygmuch power was expended on the wallboard?

  17.11: A 5.00 kg blocyoaat/5 mfhe : 9xl6f.k slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s.l9tom : af6/5xhefy a 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 horizont 76kf3yhufbr g x**66ivo6kohal surface for 5.00 s. The block’s kinetic energy strictly decreases from 53g oif*k6k66hxobr6uhv *7fy0.0 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 elks ) w7enw5/right is exerted on a 3.0 kg block for 5.0 s. The block was initiawwe)ek l7sn5/lly 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 exerted o9 )a(e8swbv bbn a 3.0 kg block for 5.0 s. The block wasbw (8)abvse b9 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 fro afu w3.5a3sfxzen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the stxa3f5w f3u.sa udent 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. r/n/touv 1mbg.lf2d( An hour after the fan han r.lo/vfgud/m tb2( 1s been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of b tu piix(l9;.mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s,.tp9b uil(i x; 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 on the middle sfuckrmjlk636;/woj 7 helf 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. The box has a mass of 1/c3k 6m7r6 lowfjkj;u0.0 kg.

  02.32: An automobile enginexy( :hcj+fln v z:,nu0 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 (ab0j z, y(n+h:cnx:ulfvout 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 with speed 5.00 m/s agg(0z q ihr:q4t the bottom ofqi g4z(0gqh:r 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 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 w*)4cu 1qx:c r(w hngdvith speed 5.00 m/s at the bottom of a rough, fixed inclined placqn4r:g1w*vh(cx d)u ne. 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 trav1g,z zr .h jak,l;6;iw,lpx+r uppbe1el to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has spee.apu+,; gr,wlx hje 6zkizl1r; ,bpp1d 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 intzbhgd b91ng3y.*lgyf/8d1a.kj9 eruerval of the acc uy 3zbr118* jgg/ekhnbd. laf.g99 dyeleration?

  12.08: Through what distance does the wgd - pg+5r;h(vuq h3bobject move during the time interval of the accevp53g wr-(hdbqh ;+ugleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is zez8ov5,wf 9 vgi2:4nvd gdn7changed from 6.00kg.m/s v ,ni 4wz:fzdvdvo798eg g2n5to 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 whi7g0raae ak(.lw fq.*k 2paq 1gle its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repre. wq(r2a 7fl.keg1kaapqag0 *sents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a h 0telbnd )6xeujscek9/l, *q8eavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is/l elk ),s 0eqtnex9ujc 68bd* μ. The work done by the frictional force is:

  14.31: A toy crane exerts an 6bc 35t l;eaxyw03 dnqupward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speeddnw603e3t cb;x5 ayql 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, tu-2ckmer))z z he 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 o)zr2-zum k ec)n the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball iw o-5gz- i mywb2hn3u0s held 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 shows the relationshipwo-y2nw-m i350zu hbg 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 /qe (/l5qqj9lb5wftbq y:s c7 sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the q5qbqj9: /c sbfy wqe7(t5l l/minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If qzz00r tfg8*jebwx q/6 rw)1g the ball travels 15 meters, what was the average net fz rr /wfw 08eg) 1bqtqz06j*xgorce applied while it was coming to a stop?

  02.26: Consider two lru(o4:5;wa xp cp gw8gaboratory carts of different masses but identical kinetic energies and the three following stp8(ouwx 4c g:ga5; wrpatements. 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 ccoo3:bfr2xjvmt ;f8p p/q5sbf3 1oj 2lay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change i8x o2sb1 f:jjpr5o3v;bfqpoft2/c 3mn its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary0-gj vv-6:h/ ssz0xmckaph-m 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’ s feet and the concrete do on the boyhmkmvsx:-ga-hz0vjp - cs0 /6?

  02.48: An object of mass M is dropped from aheightH ,t/a 4 ip0vglzwz(n ip:/ bqppj/r4a8 above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2i 4z t8wzp4na rpb/lv:pg/ (/0qpi,aj. 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 gr/vno p* vc4ozexb :;1cound. The object bounces off of a horizontal surface in a collision lasting time T. The object then ri ;*c/ boov4z1:ncv expses 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 swd1iowf(u;zs :fk a 0fv 9wrdjl18.b 3ideways until the cord makes bd318woufl ;9r zv0w saj(f w kdf:1.ian 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 sledb8.at;aakna;sj. usos 9 /y;jk8x 2 il, which started at the bottom of the incline moving at 10.0 m/s, riski 9k8ujo ;a2t;j s8al./s saxy;an. bes 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, -gyd:p13b0gc dnj, inq8gg9b 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 the deliveryman on the cartons to move them to the loadingqb90:, gybn13gi gddp 8cnj-g dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the ksrwq +:4w3 nr5b+ -9iamkmdq3tt4 fv 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 by the force F onthe bt9 ra3m nq+-k+ :wib4t m dq4v5fwrks3ox for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest xr* gb4xzlo6)rp. 9r (rw dx7ro* juky.z)3 jpfrom 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 mechanical energies o4x ojzr)bdkryr7x 3z)lpr w.ru goj6*p *9. (xf the two balls changing?

  11.28: A person throws an object of mxc4h7csou /(zekp *t7;ir:gmd 3c ud)ass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. (tc4c/ xd:; *ismu77dpcrezh 3) kgouThe 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 st zj ;grnjmnqp3q/84.+ jmhp6(. oymjnretches a spring that has a spring constant of 20 N/m. The potential g hn.jq+o(mm. qn jr z6jnm84y /3pp;jenergy stored in the spring is:

  97.10: A compressed spri 9lmcyesq -: ddd1zk29ng has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg o9-dsk: ld9dyq2czm1 e bject ?

  

  10.31: An object of mass M starts from rest at the bottohgxt02/hlq gv8 j3td1m of a fixed incline of height H. A person decides to push the object up the incline in one of two ways withvhj 8/g3tt2x0 h glqd1 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.