97.01: A force F directed at an ansp rgk/(l30l6b qgmj h,w.b0dr1 qxj1gle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done bypdq (. 6,hgblkm 0/0wj1xsjg rb3l1qr the force F is

  97.33: A softball player catches a ball of mass m, which isuj+z2 . 2bgbjclt b7s1 moving toward her with horizontal speed v. While bringing the ball to rest, heb7bstcu2z 1.b+glj2j r 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 sheet of wallboard 3 me 7 it160wh :pd:kc3t t7wwvzapter above the floor for 4 seconds. During these 4 sezw vt7awdp7w6 t: 3kthcp :1i0condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uoz uque3(cq 9, ;ejzi2niform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy s93 c ozi2e(;qq,z eujutrictly 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 wi36flx0ck:k ty th uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strit0f3kckl:6x yctly 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 for/7 per,esd7 4(wfeycb ce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal supyebfrd/ (7c ewse7 ,4rface.
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 blocka zfi23+.) oty.q 9fzx, ahemx ,t4vgk for 5.0 s. The block was initially at rest and slides on a hori vhzkm4o)tea,. fzx3tqgf,i+ 2ya9x. zontal 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 throws a wckyrk3g; y ;jau 2cj(*y+ab. 1 kg hammer in one di kjwkr g; *3ca;uj+( .2bycyayrection. 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 energy.*p r*a uok8l(u d-xgi2 An hour after the fan has r*gil2uup 8ka-d *xo( been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 osr1pv tny, :qnu0l x4c-y32 ivqy9 :vkg has a position of 3.0 m, a speed of 4.0 m/s, and vpl 2viyy 9 xcrny,q:to0vq4-13ns: u 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 boo 5um92:ug qxro1i6 sqwkroom 1.3 m from the floor. If t52gqo:1wxmq6siu ur9he 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 10.0 kg.

  02.32: An automobile engine delivexf8(/w *vkrsyh c-bt3 wcj4pech:0 5cy mk)g:rs 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), v /kx3-:0(byw5t4) phkr8s g jfwcmhc:*eycc what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves 6.x k+kkkeyc:n*j-rso -(k: oisc g *mwith 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 left with a constant force ofF = 240N. The box, of mass m= 20.0:k :*jce .no-r kkc6ig *ksk my+-oxs( 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 movesi 4y(4 y3cwr yj))pbei 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 left with a constant force ofypew4 4iybic)3j( )yr 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 starting fromgypa 5;s5h7 80mi hjvc rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distan s7 5jgmhac;8vyp50hice 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 arrs rv +8a( smd8* m5w.rnz9eccting on the object during the time interval of the ac58de8rsavmmr*rsn9rw .( +cz celeration?

  12.08: Through what distance does the object mrmr ju-ym9d8 q- 5wca/ove during the time interval of the-m rw-a/u98j5rycmdq acceleration

  12.19: The magnitude of the linear moment5nqlkt1; 6fx4n pe-wy um of a 4.00 kg point mass is changed from 6.0 nwk q5n1t;6l yf-pxe40kg.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 36.0 J of kik j*qi4ztbg; 34 cxll4netic energy while its speed is increased from 2.00m/s tob4qgt 4;3jklx* zic l4 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal itz cns6oe;agw9 lb4v)h 6 q.k*s used to pull a heavy suitcase of weig chz 6 woq*ktbe)9;.avsl6 gn4ht 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 use2 ie /yc, /dgb7gzbl8cful power output of 0.10 w to raise a block vertically at a constant speed. Agb2zec b i8g l/y,7dc/t what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objk d( +nub kc7zr)n+9awect 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 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 Earth by t7nabr(n 9kd) c+k uz+whe 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho a;y ..:9znzefm mx2i)jle9j6/ wsr lbgbove a hard floor and released. Assuming that the )ni j.2.:e9zsjebrmz lw 9y ;x/m6lf gcollision 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 surface?

  07.06: A 500-kg car is moving at 28 m/s.iicas /5:k la1 The driver sees a barrier ahead. If the car takes 95 meters to come to reasi:ikc a/ l51st, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movinab:e) piv 7v aqg(ar5*0kqr8o*n o/kb jr )f0tg at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stopokqqbbv*ia )a8ftjp( :n0v rreo /)5 ak*r g07?

  02.26: Consider two laboratory yrf xc0s)hw- )f00il2mg s+zdcarts of different masses but identical kinetic energies and the three following statements. Which of the above statements w2)dcimg0-sy f0 sf) +0h rwzlxould 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 in the aigvzhr)9uqto:t97; ssr with an initial speed of 4.60 m/s. Ignoring zottgs r)hu:qs97; 9v 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, stationary concretenj: .eq-9gx*7jrs lal surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d tj lsnlaqj79e*: .rx g-o 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 mass M is dropped from aheightH above t0kr8tqj3,a rr he ground. The object crashes into some soft earth and comet0q,arr rj3 8ks 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 ;yy bmq6h6co6 mass M 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 average net force acting on the mass during t6 mhyybc6oq6;he collision with the surface?

  96.38: A pendulum bob ma7x/qkg3t6vx cv vi0h7ss mon a cord length L is pulled sideways until the cord makes an angx60ig/k 7c tvqxhv73vle
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 s17o/ slio)qub led, 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 tsi/1o obu7)lqo 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 sid* r3c i4yq:axm2x+ ay99esmdtewalk, 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 loading4ti y*m9s 2 er:xqxda93m+ay c dock?

  12.16: A constant force F=50N (as shown in the figure) is appljjm )a9 r**zk6q4gmvqied for the 6.0 meter motion of the box upward along the incline. The maramqj4*qv zm9g )*k6jss 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 are each dropped fro- lpbk:)soln n .u;emo/g(62lq jmz-b m 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 changu; bk-z./:s6loenmom- g(2)l npjl bqing?

  11.28: A person throws an object of mass M straight upward w;w /f/) adf(otfa(vhsith 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 with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ign adsf )t/(f/fw aoh;v(ore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring pg9m,y3kyu77 irc d vv3x 8ep kt2f*3tconstant of 20 N/m. The potential energy stored in the sprft9v*7 3u8 vki py,d7g2ycemkt3 px3 ring is:

  97.10: A compressed spring has 16 J of potential energy. What is the mit7hx.t5oiy8zei p*oe)7-t laximum speed it ceixliyoi. etp7tz 5) 78-*tohan impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest f(rg nk(6d)k aat 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 perso) n(6(ardk fkgn 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.