97.01: A force F directed at an angle of θ above *w ). x)twtzmgthe horizontal is used to pull a crate a dista) tw *txm.)gzwnce D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward he;t00rs phq:n e23 jb4a* tyslcx)xq *br 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 her hand ishyq;jbt4ax* xcb 0r*0e:s2qsp t nl )3

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 metlxcie3php-c./ *r 6trs ch(h9er above the floor for 4c3he h (rcs-pl6xti/*9c. rhp seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides /kzd, h lk2:3rgdmg3mv2 hyf7with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J l3dvfg 3 z h2m2/ky,7:gmhrdk 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 accelerr v29*o vhtx nex;rka61,lda/;vqb*v1j oa*eation on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this timj v9; b aov*e6nhx;xok qlt1/rdava*2rev 1,* e.
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 dilb5nykdzs1wz6761 vo twkclpwi(:81 ew4;r orected to the right is exerted on a 3.0 kg block for 5.0 s. The block was ini o 4 ky861wolcw11n7k6sbd(5r ; zwt:wvizelptially 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 block fori 0 2qd7qpu-llexfz 5)8b 4he5yrc i:p 5.0 s. The block was initially at rest and sl4ed- ze:ylx l h05ucipq)82 bqi7prf5 ides 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 frozen pond throws a 1 .27ie h5g nx uhkz)nb1kg hammer 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 sit5nghi 2.ex7 ukn hz)b1uation?

  03.14: A fan blows to :xr0a1 4tvnthe air and gives it kinetic energy. An hour after the fan has been tt1r:tvo 0a4n xurned 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, i ga3t ;t,nem:asm;ps:sxft9sr0 s39 a speed of 4.0 m/s, and an acceleratios sst;:eit3xp:,tm grss ;fm9 n3 0a9an of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb1h pqj1y 9 gsk9t.kxraeqy)hdrb- 78. ooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates tgy yxjr b t.8- 7hks)9pked1h1qa.r9qhe 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 delivers 24,000 watts (/w:j.nduz )bfnn5k/k5ij yh (about 32 horsepower) of power to a car's drivin/ (5n.)/kkzwj :nfndiu 5jhy bg wheels. If 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 bopk ,bqmsim3w2.ebju 4 28cl8d y2: otex 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 left with a constant force ofF = 240N. The box, 4e2ijbs. klc 2ymw2p m tq8: 8eo,3ubdof 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 5.00 m/8ao5i+inom ;ds 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. Thiam ;oi +5do8ne 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, ez77ob;(- txib2hrko xach starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A hab(b; 7o-orzh ixx72 kts 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 ,qxw xeb.9upve:6jns+o-iv - acting on the object during the time interval of the acceleration?ue -o- n+ wxp9 jivx:6vseq,b.

  12.08: Through what distance does thdr.u,q5)y/g k lmt ph0e object move during the time interval of the qhd l g/0typ.)kumr, 5acceleration

  12.19: The magnitude of the linear o(9uh8*10lqvds t vxsk0l/mc momentum 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 chano 00su/9l( vqvhtslkd c8 1*xmge in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic e :hv ef9qedx37c7us,w nergy while its speed is increased from 2.00m/s to 4.00m/s. 9 ucx: 7v7eeh ,df3wqsWhich 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 42jkxtn9r()pgt 5d.dv do 2miheavy suitcase of weight 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 forc d( r.dv o5t92xjigpd )2k4tmne is:

  14.31: A toy crane exerts an upwardyt/9,v nf,t. gwmhif-nvsg+ , force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At why vntfht,,ngwv+ / i9,fg s.m-at constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of thetb qq.2ial)8 i 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 repailbq) itq.8 2resents 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 motionlesslo,odri)lswi fy-r0zy 40:1s 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 relationship between the total energy E of the ball and its h f0y 4rllods,1y i :w)o-ri0zseight h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead,l dh4+hp7v7:tixx vrl ;c( yd. If the car takes 95 meters to come to rehc(rv +lpv xh:77,tdlydx; 4i st, what is the 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 g6fjd01ca-3h:k kl e;lplfa, stops. If the ball travels 15 mete-:egpc0l13l;kk ldaf6 , fhjars, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts o 8cqfm8ah :9e.e.vk/ ;j dvbplf different masses but identical kinetic energies and the three following statements. Which of the above statements would be correct;mfbeeck 8a9 pq:djvl8 h./v.?
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 air with an ini-,x(a0en*uer6fldrt r56dc0eu 7aq ntial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy whn c(au-7fu60*ldeet xrr,d06a nq 5reen it reaches its highest point?

  06.20: A boy jumps from rest strak ss t3egik4 dl-):oq4ight upward from a flat, stationary concrete surface34i)e g4osqls kt:d k-. 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 boy?

  02.48: An object of mass M is dropped+4.-ylq)a6homd kxsyz1g kq* from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressinq1-sz lox+q6yg* dma4k.)hyk g 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 ibr/;e2 as.ek;xtj e8m s 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 o2;exeks.j;te m /b8 arf 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 sidewa 0jrlhc .0c/foo d p951dr+djhys until the cord makes an angle 1dp+d /0hjj r.c0h cf d5orl9o
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. ihmp*w3 -w n0bThe sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m i-wnpm3hb0*w 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 fbtonlwf:vd6at6h)a .2 (/ugcrom 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, ula)ottbvaf whd6n cg.:26/(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 fighh-m4vhe100jigf c:lh,ic * hure) 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 repres01, geifj -h0l*vh: h ci4hcmhents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from th8bt(pg8b s7cae 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 (babgt788 psc are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initiad*aupk(d1 a fpw, l,i.l 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 objectfi,pu (*,wa1dla .kdp 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 constant of 2e 74uc.bkrgl*1mdz4ub t3ho - 0 N/m. The poblm*h4ku41-oz d7tr.u3begc tential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What isll06wqk eoh08 1 dqh)s the maximum speed it can impart to a 2.0-kg object ?hlkd 8q 0o60)slqhw1e

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline e(dcgq4 acp 4pb1 2qt4+(vxexof 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 incline and e1d+p gepcx ( c(44t2xb4qa qvthe object for both trials.