97.01: A force F directed at an angle of θ above the horizontal wmx 6ixws(/j u :e:; sycsnh75is used to pull a crate a distance D across a level floormx:s c( s5wjn:yue7s6iw/ ;h x. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward hrc vnhm713n ,v5n:zsmvzp: s9 er with horizontal speed v. While7vnpczms1,5 vs:3 hznv9n r:m bringing the ball to rest, her hand moves back 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 sh aj h;+g zab8r/xiym.: n)gtz7eet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard? agb/;i j. 8n+rz7tmyz hag):x

  17.11: A 5.00 kg block slides with unifork-v dj p.g: 3+xst8kfim acceleration on a horizontal surface for 5.00 s. The block’s kinetis:+-gj3 x8kk.tfiv dp c 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 b 5;plhd 5opr0szys*(st 4h5 gplock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasep h(s4gps rdy*05hl55 ;osptz s 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 for6tm r:c a755tocl4eeyce directed to the right is exerted on a 3.0 kg block for 5.46eca 5:l t7yroctem50 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 exerted on a 3.0 kg blocwm*(3w-0 do sx(kqceck for 5.0 s. The block was initially at rest and slides on a horizc3-w o((wqc d*kex0 msontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initialu 1uht dnu4b;8ly at reston a frictionless frozen pond throws a 1 kg hammer in one dire8uduth;b u14 nction. 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 situation?

  03.14: A fan blows the air and gives it kine9x/pcvtonix,g ej0;8t*whj :m56 uv ftic energy. An hour after the fan has be8jv / fj60vewonp*h9ucx tim:5tgx,; en 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 positionc.boo)n ,x9 xjnon a+ j .:jg,u2/xd-pmdd(rg of 3.0 m, a speed of 4.0 m/s, an gox9.o,:-,c x)n j/nn gm+ojdjda p(.dux 2rbd 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 shelf in the bookroo -ni ldsk-dy: k61,o+5j/awzyjg6w qxm 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/ :-jd1z6jxo -agnwy k iyswql k,56+d does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 dv qvr8 v:uv+mj0io7 7 s6d3xywatts (about 32 horsepower) of power to a car's driving wheels. 3i:v8vm vdq7 x7vsd0 u+y6orjIf 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 with speed 5.00 m/s c2duz(v w,a8ph ;t:2xdn r )avlu1en5at 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 withv:(r5xa2 )pn huu da2z;ldt1ncw,e 8v 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 mov -8:+6uxz5o2 jf idccswi1hytes 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 thi5 8+wszc1: iojfdu-txyc 62he 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 travelmxmwr *)hwolz.-m ntb0)+ . as to the right, each starting from rest, along a straight road. CarA has twicexmwr* smntl)bm.)hwza 0 o+-. 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 interva:lrydeb xbc;u .2v a 2v;1*gvml of the accel.d;2ug1v;: b mvebyrl*v 2cxaeration?

  12.08: Through what distance does the object move during the time .uz0+cppy tw8*r5 fsninterval of the a0pyp 5rn*tscu 8+ f.wzcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg poqvcdp34t0+ee,. bv2d vz,f lsint mass is changed from 6.cftpv3ed, q bvv2 +4,ds.z 0le00kg.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 fdc3;rlb ec 2sh :wwn 2mm-+c+36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Whiewl+2 wn+f ;cs 3bc:mdc2-mhrch 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 suqo5xsd*9- 1.t w yj(ac4knq mjitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitca.tkqwj ( xnymc 5*j4a -qos19dse is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upwaxq uhx37v)0tw1y( jx brd force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg blo3byxu (x jh w)tv1q7x0ck?

  12.18: A 1.00 kg object is release ae 2v)duf5f3r2rzfm*, zm b:rd 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 falls 1.00 mto the ground, which one of tu2emfa,2 5df* r b3:rvz)mzr fhe 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 held motionless a heightqv6vd cegi:h)m 0/ht8g,m.o cf(hd3 j 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 relationshig/ )g jc,fhecdhtq8vh6v i(om.:3m0d p between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is movqwou(tuggo 4 hhd*.hg.- oc(/ing at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is 4.hg./(( g-g utd ho*u whcqoothe 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 stopj4 bqud5:+- xgzh9n dm ,mcb1*sfq+ggs. If the ball travels 15 meters, what was the averac4 1 +undgg sbg fzh-mqq* mj9+x5bd,:ge net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but itq)by1y)i b7 1y.oaj wdentical kinetic energies and the three following bt .1)jbi7yywa yq)1ostatements. 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 cl1 xildx0vn60way is tossed vertically in the air with an initial speed of 4.60 m/s.l6x1n d 0wvi0x Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat .3 k)lpzoo8*pol8x as, 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 muc8la* xp .3sok zl)oop8h 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 abokb4mwts z2tv a4* 3b,ove the ground. The object v ow 4bz4t ,am*3tbks2crashes 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 exerted by the ground on the object while coming to rest?

  12.48: An object of mass M 6 997yd4co o,jiiahyd is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What was the magnitude of the i,ddhyca9i769yo 4oj 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 sidewaysdlk-l 52sck 2j tygo-1 until the cord makes an anglg- j5slcolkd2 kyt12- e
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 /w +q-nw;neh*j fvq;q sled, which st;-/;qvqnfewh* nw qj+arted 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 of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alon wsjp -j3dl:y4onb0 ;dg a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has:s0bdd w;p-lj o n43jy 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 pf p98id0zm g;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 dopgdf0 zi8;pm9ne by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from r6p 4 qkq/hr s.x;pnqv(est from the top of a tall tower. Ball A is dropped one second before ball B. After ball B q(pqpn4q;hr./ v6s xkis 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 upward with an initi3+l .ywpwi/9gjf 5y nlal 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 straighg9+l5fnypl w y3jiw./t 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 sprin wa pa;8ox:sjmoz ao2../*i dsg constant of 20 N/m. The potentialip8: o./j ; msd o.aa*woax2sz energy stored in the spring is:

  97.10: A compressed spring)d /-tc-smsql) (zaf q has 16 J of potential energy. What is the maximum speed it casl c- sa(zd qt)f/m)q-n impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fa*x1wa3 je iy,gagmg8 fquy)4t5xq5 . ixed 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 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 ig5 qiy* 5y3e8 agtj.u1xfwq) x4agam,ncline and the object for both trials.