97.01: A force F directed at an angle of θ above the horizontal is usevn*f;s3s*s xg d to pull a crate a distance D across a level floor. Th* x3fngss sv*;e work done by the force F is

  97.33: A softball player catche:/m q)-y* .b nh*lbhi pzjcu;ds a ball of mass m, which is moving toward her with horizonjp n/*buy *bhm:)-lz .dqhi;ctal 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 her hand is

  99.14: A constructiono xhinv:-/ opjk+x5i qi299wc laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex-qik :wi2 9c oi/9vho5x+ npjxpended on the wallboard?

  17.11: A 5.00 kg block slides with unif8 0qhc zlk.pbi;ee6,v f:2ly xorm acceleration on a horizontal suyzl v:b;.8efhpi0qc l26 k e,xrface for 5.00 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 acceleration on a horizontal sui89nj729a e iudtbxt5rface for 5.00 s. The block’s kinetic 8 ei2tadu57 jinb99txenergy 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 3xqgtxsb6kt;pb -b /*0v k2qqblock for 5.0 s. The block was initially at rest and slides on a horizontal surfac 2-/6v; bkqp0k3qtqx*txb gs be.
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 kt +8v6b,s9;xa ayzseblock for 5.0 s. The block was initially at rest and slides on aaa 8e +s;sxk,t y9vb6z 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 thro ,ah*zs-3jbu/ z kla263vat ryws a 1 kg hamv 3ht-la/3a*2 zz ras,bkyu j6mer 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 lo)alzd0 p:oq 9 l)jtrw.(w0wkinetic energy. An hour after the fan lwr : wdtqp0)w 9 j0zo.lal()ohas been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block o4x7gg1m*vb;ak6 ;.cpk qpdi k f mass 0.50 kg has a position of 3.0 m, a speed of p4cm7 6 ;k;.igv q*xkpag1b dk4.0 m/s, 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 shetvzr (du ,fodgu k/k0k:a/e+d:74mcr lf 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 z:edrt:v0kua u/k+g odck 4m7r(,fd/ mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horse utd(5rbj;d3n :lsn;b power) 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 magnituu5:3(sn; bjlb; dr ntdde 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 at the bottriwbtbx 8+,;s7huo )v u,5kboxzy/2p om 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 ofF = 240N. The box, of mass m= 20.0 kg, has a /h b +ko)o8bvupy2,s7 x5urbx t,;ziwspeed 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 599 n(9btsam aaz9j56m l0tdlk .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 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 9ta9m6( jal0k9z mtn s5 9bladincline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each start0p qgevx-2sth0l(js c) in3.g ing from rest, along a straight road. CarA has twice the acceleration of Ccj0eg-sil 0(v.tp gh) n3 2sxqar 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 of0ql)6;: hhg bjdbq-q0t2w dthe object during the time interval of the 0j;d6 :qd bqhgfo2-lwt bh)q0acceleration?

  12.08: Through what distance does the object move during the time interval hi ts/r8 kxi/(9-1vke wope,a of the aito-xp1 has8/eei /kv (k,w9rcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is vcg 1,cd 4.:e gy:exrdchanged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s e41cex:v cd:gyd.r,g. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kiwo5 x)7b5jwbtj l8 5gknetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cxj75og5l58bbwwj k)t rate

  94.38: A force F at an angle θ above the horizontal is used to pull yk(h-nays 2u0 a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betw hu2-a 0knsy(yeen the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane eucw 1-nv+qjha :jv- 7cxerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant:c1qvva-7c+nujh - jw speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfab2 1w n.ffqpj)l,v+l8kup*v zce 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 l vn2* ,)up+ 8k z.f1vqplbwfjthe gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a heigo5/:y cf j1txd( srge9ht ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shox s51jfrto( yg9:dec/ws 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. T: i0iyn/s)eqa: as9s xhe driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net ns/0a)q s ::eax 9iyisforce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s-w7 +ymdwju7v slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while m7j+y -vdww 7uit was coming to a stop?

  02.26: Consider two laboratory carts +-cspaq w q+,+h5kpkw of different masses but identical kinetic energies and the sa5w+ ,cp +pk-wqqk+hthree following 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 vyt *t bgb-m9+nertically in the air with an initial speed of 4g btnmbt-*y+ 9.60 m/s. 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 upward3tm5td8fbhma*6 x1fb;*r2- zu4mjm qzep n;h from a flat, stationary concrete surface. The boy, of mjf6*qmtux1d- ;ba3bpmemz48z 5 hfhm*;tr 2n ass 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 boy?

  02.48: An object of g 0i +e; /yal5or:p 0uhrnl/sc10qexsmass 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 average ceo0xs0/un1;rq l/rhs0gi: ap +e5 lyc onstant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheigh/*h9iii) zbbmp3 6rz2(dk vlr t H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises up 9)mk i3rb6zh2 z(/lr piivdb*ward 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 mswf/6r52,yf ajl;op xass mon a cord length L is pulled sideways until the cord makes an angle /flx562 wj sroa,;fyp
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 unknow)pim g4zh y..hn angle. 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 .i h)ym. 4pzhgof the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-metejwptv7 nw3)ay v;ge6 m/dp4.pr 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 d; pg. nd7v 43wt6jypvwa) pm/eeliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appb+ iii+ii+7qplied for the 6.0 meter motion of the box upward apq 7i+ii ibi++long 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 box for the motion?

  04.48: Two identical bowling balls A and B arej (hf. cie:qf4 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 mechanical energies of the two balls ch4ch qiff.j :(eanging?

  11.28: A person throws q/ eloqzp1:h)an object of mass M 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 object1ep/h l:q)ozq 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 a spring that has a springv;-, ,i n yurcv:o:xqh constant of 20 N/m. The potential y q;crox: v-: uvnh,,ienergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential en7-q unuvd6 6nn fvd2j9ergy. What is the maximum speed it can impart to a 2.0-kg obju9dfnvn j66 q-dn2 7uvect ?

  

  10.31: An object of mass M starts from rest at 5m wi(fdskf*2(hl.31cnvc7w e e6nup 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 incline with speed V. How would the work done by the person on the block compare for t1nfv*mc5w(dei(u36kh2lw e c7p fs. n he two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.