97.01: A force F directed at an angle of θ aboo4 iqjc+ li by*/8zbsomp z vle*zynx/0/+*/e ve the horizontal is used to pull a crate a distance D across a level floor. The work done by the force/*l+ z*o e e0v/oznc/4zl8qbm/biy +*jiy sp x F is

  97.33: A softball player catches a ball of mass m, whznr q(+ 7b8rabich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the ho qn7 (+8zrbarbrizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 menr;/ ng3jtohkb4q4;k ter above the floor for 4 seconds. During these 4 secondshow much power was expended okg r to3hnkq/4n4j;b; n the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontaicbrb4 7qks u22 .qd4ul surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this t2 u 4d.c72i rb4sbkquqime.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slid cb0dxy d,j tvq8c6d71es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50,cbqd0 7v8dxt dy j61c.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 dir;c+qah.p xp1mected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initial1h +q;mcpa.pxly 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 exej*:-tloy9 lhbe1huia0(n9e xrted on a 3.0 kg block for 5.0 s. The block was initially at rest and syol0it h1l jn99u*x(he:ba-elides 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 frictionlodyy *j9o0 on(ess frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off(n*ydj0o9ooy 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 kinef8(xyspq 6ejb9t ):3n7ux sd fi;+gt jtic energy. An hour after the fan has been turned o9sx 7pxns6 +yfj)g3btq8 :t i;efuj(dff,
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 rdnd.kf0r- s 0gp,.i ehfff: 73.0 m, a speed of 4.0 m/s, and an accel0gf.fkdpr:-d.7fe 0fi,nsh r eration 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 booc2 xg)y,q8 mm yyete,27qz+s (2vgfjckroom 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 mqqmex+ ,tz2c(cgy 2vy8sf)g,7 jye2 mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower).tib m72l4q vh of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 lim.h7tb2q4v mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box move0 0cmj7pxh*niaef 51 ss 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 ancmji 0x15e7h0s p* fit is being pushed directly to the left 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 wi1hny s/85d2x i )zicww r((bnhth 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 of F = 240N. The box,c(8hs(5/i)bni rd21wxhznwy 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 fromn,g kkmgi(x .sr2h;nd z(*o0t rest, along a straight road. CarA has twice the accel(mki*k d,g h.srzg xnton2 ;0(eration 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 i2s a*q1lnx,lznterval of the accelerat*xn,ql2 1sz alion?

  12.08: Through what distance does the object move during the time interval o h.qu ,wd)uq w)866l9udkbozx f the acceleration9u ,qudw8h 6ubd z xw.o)lqk)6

  12.19: The magnitude of te;a2qcf y. tgp(:vt;jb, yai9he linear 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 change in the kinetic energy of the mas(v.itaqg y2c9at yp:bfe; ;,j s during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased b+,olc72*ke bu kh/qd from 2.00m/s to 4.00m/s. Which one of *oub 7bkqdhlc/2k ,+ethe 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 heavympg7mxkp3;8) nl6klh 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 wolh pm6 kpx8)lm;7k3ng rk done by the frictional force is:

  14.31: A toy crane exerts an upward force and d: ryygscb40m q*)zf6c 2erc;celivers a useful power output of 0.10 w to raise ab 6er4:ccq2* yccmyr)fsg0z; 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 surface of 6cmd r5jnfd07olt *c) the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0jfrd7 *6 ct0dm5nl)co 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 the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above aoazs se8c. *:s5um9np hard floor and released. Assuming that the collision with the floor is elastzm 8as9*5pues:noc s.ic, 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. The drivcrym*.pjv jh-to+0 7ll ye**aer sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of thh0j.l y*ljm+-e vc7 to*p ya*re minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stoglq sz pig ,zi3u+ ,n03im)y/fps. If the ball travels 15 meters, what was the average net force applied while it wu l3pii 3zq gm/,sniz+,0y f)gas coming to a stop?

  02.26: Consider two laboratory car(km1ei/hnaf 1 ts of different masses but identical kinetic energies and the three follow1f a/nik mhe(1ing 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 (p3g oo *s7fsaa 5qr;: lvqjz5of clay is tossed vertically in the air with an initial speed of 4.6q5jv*sp;aa (lo3o rs5 :gz7qf0 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 oxv.x5(c w-om)tgsg /rest straight upward from a flat, 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 much physical work did the average normal force of contact (N) between the boy’ s feet and the concrtw-g o)gmcosv5x (./x ete do on the boy?

  02.48: An object of mass M ilmsalcdss . x0b pj-+x u3.v+)s 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 neglilx3ma+bupd.v. ss0 s+xl)jc- gible, 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 is dropped from aheight H abov h/qm/d6zk;b:g1sz cve 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 the collision with the surm bvkqz/z ;1 :dch6/sgface?

  96.38: A pendulum bob mass mon a cord length L is pulled side:l1 bv0 *bze6 i y-ezrhq-miao;qsqa+ eef((:ways until the cord makes a:i *iq6-h lefq(b(s by+eo ;ra-:eqv0z1ae mzn angle
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.k+ri ((rij2eq 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 of thie+2(qi ( kjrre hill?

  06.09: A deliveryman moves 10 cartons fro58c +ebah +ikk8/(bu ojtz ,zwm 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 the total work done by the deliveryman on the cartons to move them+ozbuetzjw58 k(bakih+, c/ 8 to the loading dock?

  12.16: A constant force F=50N (aiqk68ukc o3,l s shown 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 represen3ki86uqc kol ,ts the work done by the force F onthe box for the motion?

  04.48: Two identical bowling bakfc lk95+ idq0lls 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 mechanical energies of the two balls chang0+cd kifkql59 ing?

  11.28: A person throws an obj51i+3ranq oi tect 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 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 t15 aqotri+ni3 he launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/msqsr1he z(/7u g4k4nb . The potential energy stoz14uq ss( enr7bk4/gh red in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is d/ 3xyhtkso;2;isb7 jthe maximum speed it can ;7xs3sbj/o2t ;dyki h impart to a 2.0-kg object ?

  

  10.31: An object of massb-f /6i/ds7yc*pr f7cqb;m(j1 0a bu rrmc ds4 M starts 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 incline with speed V. How would the work done by the person on the blocf7m c6sqr 1b7/4jc*bfbd urc(-d s;0yi ram/p k compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.