97.01: A force F directed at an angle of θ abo 48mt6(y oghnxve the horizontal is used to pull a crate a distance D across a level floor. The work done by the force Fgxmo68nt4y ( h is

  97.33: A softball player catches a ball of mass m, which is moving toward herjzf9;y q.zky4imy m /( with horizontal sj/.9yz4zq ;mm(yy fki peed 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 is

  99.14: A construction laborer holds a 20 kilogramlwj43u2jw0 vn sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wan4wu2lj30v jwllboard?

  17.11: A 5.00 kg block slides with unif e3ywet,ym 0pjcgot5p7-z1o 0 orm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thistpty0e o-w10 y7mzpeo,53 jcg time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block jvuu1y5pd0uagp,e b wn z)53: slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J ud1)e, uj0naupzbv 35y: wg5pto 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 right is exerted on6jujj yx,+ gf, a 3.0 kg block for,6u+,jjjxg yf 5.0 s. The block was 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 r .c5 2leeysrhuv-t5 -directed to the right is exerted on a 3.0 kg block for 5.0 s. The block wast-2 ruvcr5 h.5s e-yle 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 a frictionless frozen pond thro(h4lx ;ld2 uxqws a 1 kg hammer in one direction. After the throw, th (xl2lhdux;q4 e 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. An hour after the e3 gvx7c /)clww+0jf-6l ybhrfan has been turned/-lch 6wl7cgx)3v0+wb yrjfe off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block o3)r 2g7bbtg segkzx; (f mass 0.50 kg has a position of 3.0 m, a speed ozbeggb 7;( s)g3 2ktxrf 4.0 m/s, and 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 ii1f ,r ek eeh /2b*vtk2vk-k.fs on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocatf2.kekev k-v*t 21 h,i/ ekfrbes 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 delivers 24,000 watts (aboutse3 *ubc-eypmq42 nz4 32 horsepower) of power to a car's driv be4c4uq m zp2ys-*ne3ing 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 boxo q9zw- 2bdmnr u nt4c;o,lu9; 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 speed of 2.50 m/swhen it rm,2qnl nuz o9trcb u;;d9w o4-eaches 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, a1an+g n d6.j kdqk-8kj 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of tk.8 6qj jn +1ak-kdgndhe incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel symx;z) 8cu:4 n,0 6 yjnsxlgr0l sqa8to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car xr64g mlnxscz0j,ns0;s l q:ua8)y8y 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 theo4l o-3aqn mz6 time interval of the a6oloza n-34 mqcceleration?

  12.08: Through what distance does the object racrj-8a ctst7)b7d+ move during the time interval of tht7c)dtr 7ca8 -rajb+s e acceleration

  12.19: The magnitude of tzv)lmb24e s)m he linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in abv smz4e)l) m2 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 kinetic energy while its speed is increased friu *(/ g6wcpxnyj7zt,om 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the czti(uc n,*x6jwgp y7/rate

  94.38: A force F at an angle θ above the horiz7 setss 8g;xo,5x2t bxontal is used to pull a heavy 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. Thee7s x2gxbox 5s;s8 ,tt work done by the frictional force is:

  14.31: A toy crane exerts an upward force and del-2g6 ho5qktzj7bq 1jkivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rais67ghj o k2j -qtqk5zb1e a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earhb.y0ud/ll9 f th, 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 .ylf9uh d/0blamount 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 rd+w y3cr,ho. is held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the fo+.o c3ywhd,rrllowing 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 driver sees a barrier ahead4xq 2i 3y+jp+fawd9w7/qkrta . If the car takes 95 meterwaqi+2 w kd q4atp37jr9+fyx/ s to come to rest, 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 untilsy g*vz2bq )a:14zl2+i+u r iihcuk,f it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a sbv) z,fulyzr1 k2hg s:q4i2i*c ai++utop?

  02.26: Consider two laboratory cqcxs. n*;32q; jlbk i:yio7f sarts of different masses but identical kinetic energies and the three following statements. Which of the above ss; i* c;lxkqnib.soq3 : 27jyftatements 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 tossed vertically in: 8bokru7 6y6phfd2wt the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its hi:p 2bwrk67d8f uty oh6ghest point?

  06.20: A boy jumps from rest str-hfg v) hr1r cgc:7edr) k8;xtaight 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 concrete do on1;7)rh ekftxr:8ghdg c-r c)v the boy?

  02.48: An object of mass M is dropped from aheightH above the groxi a6jy(p2 ty)ky 9bh+aa5pey rw:.l igh04h5und. The object crashes into some soft earth and comes to rest by compresg5. h60 pja+b(yy pyik hrh5:2a)tlayi 49 xwesing 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 is dropped from al2jjyw q528maheight 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 thl j 2q8y2mw5aje average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord leqzt kgim2*/ke,sb i1k 1 n+u2gngth L is pulled sideways until the cord makes skk2kbigmi en t,g 21u1/qz +*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 uxldy- 9zsg h:8*v ff9qnknown 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 mome*vqd8-y:9zff x l h9sgntarily 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 from the sidew z5q+l0ys6uzyxy/oj4y 8f cr 4alk, along a 10-meter ramp to a loading dyycsq5l ozu 4j8r6yz+ /y0xf4 ock, 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 loading dock?

  12.16: A constant force F=50N (as sho 41o6rj6a hswtwn 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 f6jrsht6w4 a 1oollowing 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 t 1b+g6e:+ih;a8bt uu) ptjpmq+l;vofrom rest from the top of a tall tower. Ball A is dropped one second before balt8o:6em+;qb 1jgi +; )hpatbtuupl v+l B. 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 ollg6;hu,ger bj,x5 rbh1y0i6 bject 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 upward6gl y g,jb,bu5; 6erlxh10ihr 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 spring that has a spring constant of 20(ah:qa + sexiff .vn4w2yuj27 N/m. The potential energy stored in the springa(fvf4.ni+:qhxy u wa72 esj2 is:

  97.10: A compressed bdz3 s);g.3.bhb ed: cx vmcq9spring has 16 J of potential energy. What is the maximum speed it ca .ded sg3 bz.9b3c)vhq :mcbx;n impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed iq/x9 8gitx1grheys(+aeo+ d2ncline of height H. A person decides to push the object up the inclinha9si2y+q /goex+x(tr8 e dg1e 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.