97.01: A force F directed at an angle of θ above the horizontu/lqtdsaz 09 2al is used to pull a crat2sut9la/z qd0 e a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mashe, l wn7+ub,mcb4iks+s2 pdcu (h)-es m, which is moving toward her with horizontal speed v. While +mude pu )ce(cs47bb -w n,,shh2k li+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 construction laborer holds a 20 kilogram sheet of wallboard 3 m sir(q4c/lwopd ec dxg825h:2 ;hp0tq eter aboeghl 025q/dpt xwdc qr(8i2c4os h:;pve the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blocr jd;1*i;cci dvempo8 5 h1l0sk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasessh cod; r5;1livm80cd i*pj 1e 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 hor aa4ag-,+ o*aqn*zlxx izontal surface for 5.00 s. The block’s kinetic energy strictly deag qx-a, ax*o4*a+lnzcreases 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 forc d x,5odhcjz,-e directed to the right is exerted on a 3.0 kg block for 5.0 s. The block wz5 ,dxo- jdc,has initially 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 r,2y *6fbey( u5krl /kgqy6uzn ight is exerted on a 3.0 kg block for 5.0 s. The block was b 65ngruu 2yy,/z(keflq *6kyinitially 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 a frictionless fro7mbe3jei5s0,n) zy m hzen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in e,3jyhn7m0m e) bsiz 5the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and1 w8 d:uzsf*44fpsbe k gives it kinetic energy. An hour after the fan has been turnsufewbd14*8sp: z4 kfed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of massrgn( b k,5fcs/ 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accgbs k/r5(nc,feleration 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 s.ma80jam0dtwbs3rz e6pp: jdw9-iu 1helf 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 do8.t wj0pabmiwu910:s prj- e6ddz3 ma es he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine dxmyu5: ps* qab,zts in++ufg*rx) m 4*elivers 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), what is the magnitude of the ru+r xsf bn*am+y*im,g4*u:q)tx z5ps etarding force acting on the car?

  09.13: In the figure to the rig lpwhdxs7m;7glp4 y e5jui/)(ht, a box 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, of mass m= 20.0 kg, has a spelxs /dppi(lm77j ;yu4) ge5hwed 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 bncaf2-j.)7 .sq+ dr0 qupyqk 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, of mass mrk.0q.qjn c7b2-y f q)su pad+= 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 righ fw-gder t*9*m sgd8s)t, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, r t8fmd)9- ggs**wedsCar 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 act4 ,el lkhagj8m);wf8ping on the object during the time interval of the a)eg pja,llk8h;mw4 8 fcceleration?

  12.08: Through what distance does the object move during the time intervyd8ykxcft0z abrp0y1)nz 0),al of the acceleratiyy xc0krf)d)nzp0 8 a0by tz,1on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanzeb 48)q ito7xged 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 ent84z iqeb o7)xergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increaseut,yb -1, vkd.wq ,0/vnzmelpyo*3xi d from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the.du-pq m0*,z,1nevty,ywi/ x ok3vl b crate

  94.38: A force F at an a/ h.0i cjf1 wwz- 8q,)aue6wytnfgh o(ngle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of frictio(w j,t zh)gi- a6ncqfoueh81wy /0.wfn 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 *ujihn* -rfcb4n5xj7useful power output of 0.10 w to raise a block vertically at a co*b r*cnfh7 n-juijx45nstant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is 4) tn kue120p tnc)fiz9lf4i bo3tsz5/uu8v preleased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 )pu0t)binffuo/k1z 3 9 p 84 l5vstuic4znet2 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 mot,0/x -zch f; ns9n yo:dfpyg uyrdc220ionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which onru n2dfc,- nf0ozg9 :s yp2cx/;h0y yde 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 mon4q2ov hbswoq.4 y 9l:ving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net 2qol h49vwqy 4.bons :force necessary to stop?

  00.26: A 500-gram ball moving at 2mri( e8pe-ol)e+px b(ykm *h15 m/s slows down uniformly until it stops. If the ball travels 15 meters, w) (x-kp (o8* ei2 lemybm+rpehhat was the average net force applied while it was coming to a stop?

  02.26: Consider two lanqw/0.jfmh* :rmbmp 6boratory carts of different masses but identical kinetic energies and the three following statements. Which of tpb0/mwm* qn6jmfhr .: he 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 tosseddzp2.f0kz7bu1dz+ pa vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its uadkf zp7.0 z+zb pd21potential energy when it reaches its highest point?

  06.20: A boy jumps from rest stras01ay w* pg4lzgu ,a:pight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surzgg1 :* awa4lys ,p0upface 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 from aheightH above the ground.tx ,bxd;)dw;dd/ b o+ kcik4m. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air r) d m d;+/ocw;d4,b xkdix.btkesistance 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 is dropped fro ffpr4no*92r)lck)fdig0 oq9m 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 forf094rfo 2lr9pd iq)cogk)n* fce acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pt 3y b*hyu4-gyxy0q v(ulled sideways until the cordyyvh4 gxu0bq*(t3 -y y 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 2x /if wd6azo)of unknown 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 posf2 /6)z xiwadoition at the bottom of the hill?

  06.09: A deliveryman moves dgegn2c6rsh ay-y)4 c+;ss(j 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 by the deliveryman on the cartons to move them to the loas -hsgcd+j)2 y4g(a6ns; r cyeding dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for tkgjok g5pj t. ):*rzv;pv cv26he 6.0 meter motiockvotk)gjpr6g *p v 5;: 2zj.vn of the box upward along 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 are each dropped from rest from t1 u2 dl1ud1 a(eezt-awhe top of a tall tower. Ball A is dropped one second before ball B. ad 1a21dwu -eu1zlte(After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M strain+3i9 vpd;us nght upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws+3 ;puvsn9ni d 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 resistance.

  96.20: A force of 10 N stretches a spu7chhdk/ 4p98u5cu 8pb, i0fipprhn0 ring that has a spring constant of 20 N/m. The potential energy stored /9pd i7k ipphh,bpucc unu 8h8405rf0in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is u+as63lo--hhadg3 *r7f oxyl the maximum speer3fa ughhxod-3*7o ly-l+s 6ad it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fi4fa/m9e hjskio/73xfrac nf/) p )ke +xed incline of height H. A person decides to push the obja 3k/e n9ffer4/hkpf / axio)smj7c +)ect 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 the object for both trials.