97.01: A force F directed at a1pwx(+ ndy(9 pl;zeaon angle of θ above the horizontal is used to pull a9ypzo; w+dx(ae (l1n p crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a no/ d/l ,9r, c)pwazqrball of mass m, which is moving toward her with horizontal speed v. While bringingaw,)l/op9 zr/cr,q dn 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 s94; w rohcuz23 meter above the floor for 4 seconds. During these 4 secondshow m4z;cw u9hro 2such power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a ho8zcik :m8xdu)s fap 23rizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this duf3zxs:a i p2k) 8mc8time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg blompr/lc9ra /wq10u v t9fphq03s)g; fi ck slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fr3migtq vfq9 s/p9r pw l0r1hfauc/0;)om 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 3.0 kg block for(4p-o m6h1dthjob 93sdc+ pfr 5.0 s. The blod3+6( oc4r 1 smbj-pdh9o hpftck 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 ie i -h7 jppgjwfvh190:s exerted on a 3.0 kg block for 5.0 s. The block was initially a09wvp: jh p h1gife7-jt 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 frictio *ak:/pcv/ +xfpx :ucznless frozen 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 the other direction. Whz:xfp/c *kx cu+/p :vaich of the following correctly describes the above situation?

  03.14: A fan blows the air aujq zrr-)/0lo7n ab0snd gives it kinetic energy. An hour after the fan has been turn 0 r/n-z sbr0lja7ouq)ed 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 position i99.n d9 rrn9/hteuzm m7kre8h4p(7z y*nouxof 3.0 m, a speed of 4.0 m/s, and nkt(h npe.n9o9d/z4 *zru urmmi9yeh8 r7x97an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is 2ox5cwcfd) t cj3/oi0vglg. ( on the middle shelf in the bookroom 1.3 m from the floor. If the janitor o)g0 xj 3cot g/v.fclidcw5 2(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 mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower)+6*jal3 gkxq j8jimeij 82h6t of power to a ca6*6a8j x3em2l ijikj+tq8 g hjr's driving 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 thed6)bdqfhan2 0 right, 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 6qdafnb2dh)0 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 5.00 m/s at the rmf p+ l1k wk8u;q0q:ebottom of a rough, fixed inclined plane. The box slides with constant acceleratipqqrekk+ m:uwl 81 0;fon 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 rig n):)yf9a .p98yatfzsj q8kxy ht, each starting from rest, along a straight road. afxqn s98z 8yfat).:p jy9yk)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 B?

  12.07: What is the net force acting on the object during the timeo5 lk9hb. bu(a1)h z hcxx;)bf interval of the accel(cb9b x ;1 )a5)f.oxuzhh klhberation?

  12.08: Through what distance does the object move dul n/(tma dh0a.ring the time interval of the accmd. h(a/0latn eleration

  12.19: The magnitude of the linear momentum of a 4.00 kg pointc.6pmyyb+f3u. mub + 4*pgt m*jvf)kv mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is tpcubm6f4. b*j.tgfm+ v+vyum *yp)k3he change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic ds,jk dj*sijrx7rp; .vivvg5 +f2crr o:* - h*energy while its speed is increased from 2.00m/s to 4.00m/s. Wrj x ri j*vvv*ghi.2o*s,s; + 7-pjr d:5krfcdhich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle t)y*pd9 x r3du θ above the horizontal is used to pull a heavy suitca)pr*yx3t9d udse 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 work done by the frictional force is:

  14.31: A toy crane exerts an upward force ase +9r4gyi) wtnd delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant4et yr is)+g9w speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from(z 4yfm+oamit3 ,qfxdtxo6)1 rest near the 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 d3qfa, mdzofy+6it x)mt o14(xuring the fall?

  96.18: A rubber ball is held motionless acv+74 /w:uwjz *-v-xe1bf ugue bpu3q height ho above a hard floor and released. Assuming that the collision with the floor is elastic, wh-peub :7vbuewq j1c xfug-vzu3 /+*4wich 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 driver sees akak y k7b.bv0/;ydo)k5;m ukb barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to /b7d;k.uaok vb0ykmb5 ;kky) stop?

  00.26: A 500-gram ball ml)31m,bvy kun w a8:58rmbvwloving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net for )m8m3nybw v,lkblw 18:a5r uvce applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differenthq0 y ,16xtbav masses but identical kinetic energies and tv ybx1,0h6tqahe 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 clay is tossed vertically in the air with an me ;z ec7j5u.zinitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest 7cm5z; ee.uzjpoint?

  06.20: A boy jumps from rest straight upward from a flat, stationq72 m lyr/wq0lru 5t5pary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass qrl0u t2y5 w/mrq7p l5rises 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 drwo2:r e xg)f7sopped 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 resiss) e 7wgo:r2xftance 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 aheight H above the8zfw( m dfzh/rq6w29rf35 unq ground. The object bounces off of a horizontal surface in a collision lasting time T. The obnm52wf36urf ( 9 dqqf8zwz/hrject 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 pulled sideways u xb,pzr , 0 5.q3jr:upe,dwjtfntil the cord makes anpe .pdq3rj juz0,wrf ,x5:,bt 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;q x,f6b fcieo0e b;bq,30i ke 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 position at the bottom of the hill? fqf,ie,0be6 iqb k ex;bo30c;

  06.09: A deliveryman moves s9 +/fqnx0txxa+d-ar 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 xx-+ta sn +d0x9/qfrathe cartons to move them to the loading dock?

  12.16: A constant force F=50N (ast7f8 e6glx )*oqqfx hj3:wn.z fxaz :* 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 chezx:lx:f 7h6.83 *) o jntfqzafw*qxg oices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are eau1:wk ut8i7b bpkyc5* ch 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 mechanic:kcu bwt718i5 *uybpkal energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wit-ee;(,4gc )bcnd9 lgn 0 bvommh an initial non-zero speed v. The object rises tmlb 9n nb(, mg) ceodec04-;gvo 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 resistance.

  96.20: A force of 10 N stretches a spring that has a spri5z1wq q hgis m804i(opng constant of 20 N/m. The potential energy sp0m5qigi 4 h w1(8zqostored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the max0(p4izcwma,zz gu +0gimum speed it can iaz gmg(wz0u cp40 ,+izmpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botto z31n2hmzd f5qsvln35o f;s s2m of a fixed incline of height H. A person decides to push the object up the incline in one of twozvss 2fh5nd5q ls3 3o2 mn;fz1 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.