97.01: A force F directed at an angle of θ above the horizontal is used t.az)u+ zfg .bfhk+ux;eg 0u ,go pull a crate a distance D across a x+ +,b au.ffu );gez gzk0.uhglevel floor. The work done by the force F is

  97.33: A softball player catches a ball mjt ly;pin/g5.- jy6uof 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 horizon/5glmun;jj6tiy -p. ytal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogb mvvg2l7;/,ms(p grl/t x7cj ram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshowpv7slxt7gb/;vc(m /g rjml 2, much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on adm / hyhmur964 horizontal surface for 5mhmyrh4 d u/69.00 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 accewn k- lj*e(6nhzty+gq s2a3d:leration on a horizontal surface for 5.00 s. The block’s kine2a(ljzntdysnw*+q :g 6h-k 3e tic 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 on a 3.0 kg bl+wvipq,e x*uute9ug r k ov52ly2 8rqj5l6 .)gock for 5.0 s. The block was initially at rest and slides on aeow2ru.rtl gql y9u5q+6 ge8pv v,x j2*5ku)i 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 ak; t-x6p2 + h3r9xjeyyzx kwo:5a.pqv 3.0 kg block for 5.0 s. The block was initially at rest an3j6: y xro5kkzpx-p+9 twv;.a yq2hxed 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 frictionle4g.cps 6:; ud88wzykzj xd2)+fmhgv 0hpegr 4ss frozen pond throws a 1 kg hammer g8hc+g40ejw 2 x; ghfv)y pk4zspm.dd68: ruz in one direction. 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 kinetic ;i.ceb(t .wii energy. An hour after the fan has beiw.;be. ici (ten 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 position of 3.0 m, *3ey/j opdb84 bfgzwui 1.z.va speed of 4.0 m/s, pz3wy / o4z bu.8evdjibgf .*1and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old 0j be *o; z2ugs8nev)sbh s-/ftextbooks is on the middle 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, ho2 s;nf08usg*ej-hev /zb)sob w 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 (aboutj1m9e1 iee8d r 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 forceei18m je9 d1er acting on the car?

  09.13: In the figure to the rijo fr9xmf6l/ wwqi49rog8 s5t) r4*xwght, 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 lef x4g5m fqw*i) lwx or8o4sfrjw69t9/rt 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.u.( g0 yqzv:hsbp(e )x00 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 = 0(p(vxhge:qy)zsu .b240N. 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 startiyx1 8tlfj) xwsd:r e qm,bin3ip4h-:4ng from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Cjyhq -xp 3e4df:1ti 4xw8r :bnmi),slar 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 foy*bsff211fcy9 uv3las -n * afrce acting on the object during the time interval of the accef-yb ns fa*12vu9*f 31cayflsleration?

  12.08: Through what distance does the objectojzh2(:dovtua,g m d-(e7 ,s*x nbvo* move during the time interval of the ac ujdn( o ethov7 (*agzv* md:xo,b2-,sceleration

  12.19: The magnitude of the linear momentuin*u ;*e o0ddym 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 mass during this tiu; en0idd*oy*me interval?

  14.11: A crate gains 36.0 J of :e,:. *rjbkjju cft 2dkinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following dfjj .:k,2cuerj: * tbchoices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontalg-*pb w +bp;gp is used to pull a heavy suitcase of weight mga distance d along +pp*bgpb ; -gwa 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 delfxqvrr e9s--3 znid:2vi 6g9 fivers a useful power output of 0.10z q- er:96xgvdrvif9 s -ni32f w to raise 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 object is released from rest near the surfact,jljn c a g:v*o2y3*je 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 Ear:,2v ogj 3anltjj *c*yth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height h4md dzwcb7-a/ o above a hard floor and released. Assuming 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 sur/7czma 4wb-dd face?

  07.06: A 500-kg car is moving at 28 m/e.s6vv o;o25zx ln3vfo t1ki .s. The driver sees a barrier ahead. If the car takes 95 meters to come to re.6l o3.5nti;e x ovfkv1svz 2ost, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram bal(g :zuvo1xump;;eht) n: 1reul moving at 15 m/s slows down uniformly until it stops. If the ball travelopmrgx:e ;uu e zu;(h:vn11)ts 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses buy uzci :sus5c,* rhu:9jm 0(k5fudl t5t identical kinetic energies and the three fo5fuuj:sdr:9s5u y5k*,mci0cl( uhtz llowing statements. 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 clay is tossed vertically nj ;l54*cg96tjfflyk k8v;thin the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the hv fjngy; ;k6 9 cflk8lt*t4j5change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straighs .g/f0 u3f a4ty)cot 2hbzyn3t upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and hi/ uff3 bngcy2)ahz.y3os04tts 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 boy?

  02.48: An object of m zb7)xa)2 smeurc7h)(dfsep/ (,sw zoass M is dropped from aheightH above the ground. 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 ac),orsb ew zaxu/ fsd7z(eh 2()sm)p 7verage 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. The obje:c-k + qgp,v)pld dt6gct 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 thl:,pgc) gk-p t6d +dqve 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 sidewg 7yn)t *)u;v3apg qy *n:b3(tojenwsays until the cord makes an angjgot sa)3q y)n(wnu: t3;bp*eg 7*ynvle
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 v/jq2ef;pgu pp,pmgwo.2k 4 8incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises top g/fm pu8v wgej;ppk4o 2.q,2 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 mk;,t qv :1arscartons from the sidewalk, 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 t;,amr q1vk:sthe total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as sh1.a2;*bnl ckn kqumpk08 tj f:own in the 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 by the force F onth*0k b1: n2qn;8lau mkc pk.fjte box for the motion?

  04.48: Two identical bowling b- 7 1h4): sdomlzaypzwalls A 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 me lp ): wmdzo7yaz4-s1hchanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwarz bpdc n8.3ark1hyv:2i.y o*kd with an initial 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 wy8ok3pr:.b. y 2a 1*hckinzvd ith 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 spring consta ubyh(wzxe( dw:q;2b(nt of 20 N/m. The potential energy store;ey2z:bxbh( ((qww udd in the spring is:

  97.10: A compressed spring has 16 J of potential enerhrtef / g1 9j9dwbav07gy. What is the maximum speed it can impart0dw1v t7hfg /jae99rb to a 2.0-kg object ?

  

  10.31: An object of mass M starts ycoe7 q5u;os*oo6m e9 from rest at the bottom of a fixed 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 y7q5 6uooce*os9 ;omeincline 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.