97.01: A force F directed at an angle of θ above the horizontal is used to e,gi nwetw);7+pzn/spull a crate a distance D acro n),p+iw7t/ g;wzseenss a level floor. The work done by the force F is

  97.33: A softball player catches a ball *nj y rtkmao86uvx.fm:2z4g* of mass m, which is moving toward her with horizontal speed v. While bringinu*kmg2*x m4 zj6: .t8va rnoyfg 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 construction q45hwu9aie 2qwpu4 v,laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the 4pei9qh2uwqwa,45v u wallboard?

  17.11: A 5.00 kg bloc fo+*llhax02r m8/x ibk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from +l/r 0omhl*xf28bxia 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 with7x2tpksqe c * 5 q3g2c1f,sqw/lp)eux uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly d stsce * wqq p,7x5/lc peg2x)1k3quf2ecreases 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 yjy8tn3 dwa1+right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surf3nyy jwt1ad+8 ace.
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 onof c5vr b,1qdvlpds .m7t a(r(9nkg- : a 3.0 kg block for 5.0 s. The k. f:m a-q7br5vc,g1(lsp tvr9ddon(block was initially at rest and 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 awuxoj1iv .. +;ibcoc0 frictionless frozen pond throws a 1 kg hammer in one direction. After the thr0 i1+cxi;woc v. ubo.jow, 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 them6tee1 *ddfxyrw+z; 4 air and gives it kinetic energy. An hour after the fan has been turnextfe z1*y;4dmw+rde 6 d 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 posile7f0a qlkuf 46d/z 7gtion of 3.0 m, a speed of 4.0 m/s, and an accelu 60flz q7a4ke/d gl7feration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old zxa11xxy)hf)+m ;+owg 2wo ywtextbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates twx xm1)zha;o gwo)f+1 yyw2 x+he 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 2 bqfcw*t*vd21+spcs engine delivers 24,000 watts (about 32 horsepower) of power to a car's driving p2 * wv1bs2qc+c*sdtfwheels. 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 b 1 ,1 uy gliuep:2vg5rikotkid27pd8dg8 gf+ 0ox moves with speed 5.00 m/s at the bottom of a ro8ufy:2gki8udtdgor7 2 p,p1vid iekgg+l 015 ugh, 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 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 5.0q.f;ba(k9 6 5hhb2if d5 wtcor0 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 inclinebwah r.bkhqt i (f6f5od; c592.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each starting from rest, along a st ll(iljom2 -l/ h* 3m u2ijz260rk9ahbvnxu6hraight road. CarA has t6 -j 2ol2lh( n23i/luu6ljza vhhr9 b*ixkmm0 wice the acceleration 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 8bt kruz5as o46rf62nbn.m5y *f+p ekon the object during the time interval of the acceln2r zy+ t4ufab8 pmn k b6o5sf56rk.*eeration?

  12.08: Through what distance does the object move during the time i *0t xyv:(kqmd88aq)gd xdo 4anterval of the4:() odvmdd0qxtykag88x *qa acceleration

  12.19: The magnitude of the linear momentu )5wqhp7icqn*b w+ r5csda* d7m 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 w7)+dbq5dairn 7q s *cc*5whp. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 m2(fa czhz/3q J of kinetic 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 thah/mz 3zfqc2( e crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy 5ie34db kopq5suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcaskop q55ide4 b3e is μ. The work done by the frictional force is:

  14.31: A toy crane exerts gv0*9f ukm,k tan upward force and delivers a useful power output of 0.10 w to raise a kgktu9, m* f0vblock 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 ofsi3yy6bre 28pzz nbc f7oz,)6 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 the 1.00 kg object during ,y 826ny) o67zb brf3cipzezs the fall?

  96.18: A rubber ball is held motionless a height ho above a hard buwj9w4q :msz:)9 vrkfloor and released. Ass bk9rv s:uwz4 9wjq:m)uming 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 surface?

  07.06: A 500-kg car is moving at 28py)jzwx zb*i 6*ckw* , m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what isk6*w yzixzp)**b,wcj 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; lvw5z;or,mlb*swjr pgx* 5/ it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stopplswob ;;lzr/, *g m5rxv*wj 5?

  02.26: Consider two laif zjzjn 5q 57hei54(xboratory carts of different masses but identical kinetic energies and thjz(e f7n4h5 iixz 5jq5e three 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 g 7+li9bejp+u ,e vww7clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential eng+we7 l7 u,9jwb+ipevergy when it reaches its highest point?

  06.20: A boy jumps from rest straice qr-t5g2;m,5- t)vihjkd jesy7*xight 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 distan 2t* 5jte i;he,m-sgkcd5yq)ij-x7vr ce 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 from aheightH abovce95, tcmmz4u a1d7-)94ybe z bwt tple 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 constu9aw1m4eem7,4pbc 5lcdz t)-9tyt zb ant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropp leazw2qsuwr- /.gva a8k7*e 3ed from aheight H above the ground. The object bounces off of a horizontaugv *8w3qe-s/a2lawzk a er.7l 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 surface?

  96.38: A pendulum bob mass mon a cord length L is pi e4vj.(ddtwuui7l l( c;s./bz -z r9rulled sideways until the cordd(b.vi4/ wurz i;. sl-dl7 e (z9jcurt makes an 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. The sled, which u0juzb97r rs5 ;k.kskstarted at the kr7u5zb;.9u srks0kj 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 the hill?

  06.09: A deliveryman moeu.)zh-1 l+btiun b1eh( t ul.ves 10 cartons 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 the total work done bulnlt1h-u. he( )et+z.u i1bby the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for thev lh 6o:e);nt-vglh8 g 6.0 meter motion of the box upward along the incline. The mass of the block is g ) ghe8 vtln-h;6:vloM=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 ballsr4oa3la 6u 7kc ymcq34 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, ca7ru qk4mcl6a 3yo3 4how are the mechanical energies of the two balls changing?

  11.28: A person throws an objez(fnevb*viw b,d 1ngo74*r a: ct 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 the launch point? Ignore air rr7 zfni(w bn 14 g**ov:,vdbeaesistance.

  96.20: A force of 10 N stretches a spring that h/mj8v m)o 3xprtsg0c:as a spring constant of 20 N/m. The potentiajp0 ms/rvo)cgxm:t 83 l energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energymb3n6 dufn*m40uh q*jrw4 6kb. What is the maximum speed it can impart to a 2m6* kfubn434 6h*m nqujbdr0w.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottomryn 2;f /(rlmardd r9kviri* + ,r2o*n 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 the two trials? Assume the same constant non- zero coefficient of kinetic fri 2ki ld oy*9f+vrirn rar* /mn2r,(rd;ction between the incline and the object for both trials.