97.01: A force F directed at an angle of θ above the hog 7 /d wm-hvv3;s2wbf -dk,ewxrizontal is used to pull a crate a distance D across a level floor. The work donevw/ 3g dwdbxsw k7hme vf,-;-2 by the force F is

  97.33: A softball player ofpqw:9 id58bcatches a ball of mass m, which is moving toward her with horizontal speed v. 8:pdbi9w qof5While 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 20k0vv, onf+e6l ,wwaq 7 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 q,f,lnve7 + wvoa 06kwsecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerati,sfr3 k:0yge/hs myx6on on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thx yy603e, /hrsfkgsm :is time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration onf b8r :wncsnu5o+vz4bol0mosw ..z/kx0 va5- a horizontal surface for 5.00 s. The block’s kinetic energy stric.8s k0cum 4on:.r zf xwob/v wbons5zl0-+5av tly decreases 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 right is exerted on a 3.0fj4e 5oj h3ij2 kg block for 5.0 s. The j 5e4fjjh3o2i 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 directed to the right is exerted on a 3.0 kg blockb twm ao zqbh 8g,h;xiv83,*(o for 5.0 s. The block was initially at rest and slides on a horizontal surfaagbbvhx8;mwqzho 83 , ot*(,ice.
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 kg q6*n adwvmt6 8hammer in one n wqtv*a86m6d 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 situation?

  03.14: A fan blows the9e9k,s7ilhebe- ic, zoq vx (ty;;b0d air and gives it kinetic energy. An hour after the fan has be0 (,;e9lqbh v7, -zotci; i kxysbd9eeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl:0u( 21jaqq6ywm ;s da1plh vcock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accele1qc j:saym 1 dqhl0w ;p62(avuration 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 /1a 9 zil7euunmiddle shelf 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 flou9al 7/zue 1inor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,04w:qb0i khvx3aa*c: i00 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed ofb*aivw ::0 i4hqk xa3c 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 box moves with speed 5 0+gupqhnc95 d.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 boqh5+ g09d ncpux, 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 rig6t5fglu5s y 0:mcscc4ht, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelera5scsy6 fmu0ccg4:5l ttion 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 incline.
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 straigg 7 4yo,w4-uov5ushcy ht road. CarA has twice 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 B5u,-yug7o hs4vcow 4y ?

  12.07: What is the net force acting on the object during the time lppj/3q(.uo 2xx yb2d interval of the accelq2ob3pxj p/xu2 dy.(leration?

  12.08: Through what distance does mi87:fez ly q:0yu(zcthe object move during the time interval of thee: c:zfyi7qzuy(8 0lm acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changmeac y;rr 11 bq)ro*n8ed from 6.00kg.m/s to 14.0kg.m/s8c*r;1mr) nay1boe q r in a 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 s i+wlix70k jirpc4 d94peed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cra0cl9jd pir 447ik +ixwte

  94.38: A force F at an angle θ abov8et x2, t2 e.rp.a jk/r qqago3f9d6bhe the horizontal is used to pull a heavy suitcase h8/2je.9dekr q6rto gftpaxa ,.2 3q bof 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 force is:

  14.31: A toy crane exerts an upward force and delivers a useful power jc0; lc545v es/ pkbuzoutput of 0.10 w to raise a block vertically at a constant speed. At;bcs5l4c0 vupke5/j z what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near iu*/i6 p d*qoythe surface of 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 duringp i*6u* qoydi/ the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floo(d53n vpozz o7b)tn w0r 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 height h above z z5pwo7b 3n0to()vnd the surface?

  07.06: A 500-kg car is moving at 28 m/s. The 4x,p: 2cmk e;u3xgzydz i30um driver sees a barrier ahead. If the car takes 95 3c:m x0m ;u ygzxpudze,i3k2 4meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram balldpz,vdm:4x4sq -i fvgo(36ws moving at 15 m/s slows down uniformly until it stops. If the ball trave qx oip-dfvsm(44, d:3zvg sw6ls 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic z*:c(nu(x kpbenergies and the three following statements. Which of the above statements wouldb:(uk *c (zpxn 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 verticallyof1qnl3k 4orzqp 4p6(89b )l r8hpyqu in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what rkhu6o98n 1fq zpp 4r4 qb 3yo8pq)l(lis the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward i)* vhkb:wo 2xfrom 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 physicxkw2)h:* bovi al 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. Ts rw 1vb d(w0x+ eazfa7d+9as*he object crashes into some soft earth and comes to rest by compressing the earth a distaneaa+wdr1dzx(7v b sfs90aw * +ce 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 e4x,+ myn am o.d/tybx de6;u9M is 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 heiox m,dx;/ena+94eu6t yy d .mbght 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 lengqz kk,svpl4 /hep2 a4dw:7n+m th L is pulled sideways until the cord msk, 4d:e4p27qnv+hwa pl zk/ 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 6qv( +w 4pfzxna uniform incline 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 momenta zfx4(qnw6v p+rily 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 sidt tm(a vcv1*0zyfj*i( h g6dazr:r9 s9ewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass d :*v9vjry*zf0(9z6t( gic srah tm1aof 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 s5oew+ uxh8w ;(fs z usmq7kdp7,+a*e mhown 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 represents the work done by the force F onthe box for the mom*u5emhduao8 (q;sw+ zwe,xf+ 77k sp tion?

  04.48: Two identical bowling ballslh7 .yvu2pz6qfin,+ 1 3t zrxl A and B are each dropped from rest from the top of a tal+3nzul1rxhi 76,yp zfv. l2q tl 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 changing?

  11.28: A person throws an object of mass M str frkxgpzohbu)x(3m -2 w 8-) w:dwk5lwaight 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 rispf oww h--ul3)kbwxk2: 5r8g)xz dwm( e above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant ofb q9,/xic7jnn 20 N/m. The potential energy stored in t7nn/ cib jxq9,he spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the macgf8 /(h-z1 wci rah5wximum speh/hwzf-w 5 8gc1( ciraed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bot+0aw g4/i(z vko z4ov8kb8 gpvtom 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 kinetbo /4ag+pizkow8( kz0vgv 4 8vic friction between the incline and the object for both trials.