97.01: A force F directed at an angle of θ above the horesg+4j tejzo-rm d22 (izontal is used to pull a crate a distance D across a level floor. The work done by the force -egs2m42 zr( j +jtedoF is

  97.33: A softball player catches a ball of mass m, which is moving toward hzell7m5 a4v 3der with horizontal speed v. While bringing the ball to rest, her 7a5lvm e4zd3l 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 u 9 .sci3v+v jdd du17orhe4y2kilogram sheet of wallboard 3 meter above the floor for 4 seconds.vhd3 u +ri2u1e9.yo vc4jdd 7s During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal fjyprhw2l. 4/9axbdqet* 9x3) )k cjw surface for 5.j fx9kbjqwc a9 2w.ed yr)h)4/tp*lx300 s. The block’s kinetic energy strictly decreases 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 h,df(l5ozssd y4 y n40 2wbbwj6orizontal surface for 5.00 s. The block’s kin b40wyj 62b(n4s zs 5fdolywd,etic energy strictly 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 as dqdn .rvu/fea:+ qfkh4( j00 3.0 kg block for 5.0 s. kd vf0q4e jfdrhs 0/(a+ n:uq.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 directed to thmxl2e;;7dp .ojhkdj + e right is exerted on a 3.0 kg block for 5.0 s7m;j ;kd.e+ lp x2odjh. The 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 initi .8d 8qqk dkhntvs(0w0lp3q9iw91pl,vjc i7lally at reston a frictionless frozen pond throws a 1 kg hammer in one dik pql7 h0tp.v9i qcws,w9dlvljn3k 0 iq1(8d8 rection. 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 the air and gives it kinetic energy. An hour after the f vjju(z 0/ybd*an has been turned off,b(jzy0* jvu/d
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg hy 3,6s7n qyhg 5se0vda4oonh )as a position of 3.0 m, a speed of 4.0 m/s, and a yo7 ,so5)qeahv3nh 046gsyd nn 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 on the middle shelf in the bookroom 1.3 m2 +k *sfad(kpx from the floor. If the janitor 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 2k(sd fxpka*+ 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower 9p z1w )ihfhj8mxm/:t) 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 retardi9 )tm pij:x8/1 hzwhfmng force acting on the car?

  09.13: In the figure to the right, a box movesp,oj 3rfxe e(6 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 beinrefp ,ex 63(ojg 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,:uzm(,vr h , sf:u7thl 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 itzrm:v ,fu, t h:7(ulhs 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, alonuqm 5ugnx4- f-g a straight road. CarA has twice the acceleration ofnxgfu u -mq-54 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 neynuhgdh )4 r1w 62d1fj*u.fur;qzk. ot force acting on the object during the time interval of the acceleratnr. 1z;*fkjfdur h2yqhd4 .w o6)ug1uion?

  12.08: Through what distance doeap:e 6cm9 u2;fa-cev5f rsa-bs the object move during the time interval of the accele9; 5:e aprcfeb us6fva2--cam ration

  12.19: The magnitude of the linear momi6r -bemsva92rkw 5x)entum 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. What is the change in the kinetic energy of the mass during this ) bvwia ms5r-e92xr6k time interval?

  14.11: A crate gains 36.w 8.qq op2bah0z9a4qj 0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best rezaq829 hpqbw.j4a0oq presents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pulpg /,mh) l,biol a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficim/ibl ogh,,) pent 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 output d ,obpuq,r,vgs6c rt/jj (;*sof 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg blgrtvpjsq6o;du,* j, ,/rbs (cock?

  12.18: A 1.00 kg object is released from rest near the surface of the E*;z7,z e8g n/ihn:kxfv 3uzc,+cp yctarth, the gravitationcv/n3f78y;up* , ,tzcgz ickx:+z henal 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 the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor aehxn /dlso+r3y nsg* b9;0h 0tnd 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 t; g y*0s0bx rotdnhsn+9/ehl 3he ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a.b f;g,js fito ke4 ,ad2lul1* barrier ahead. If the car takes 95 meters toe f1d;g2l,.obs*jilfua t4 k, 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 until it sto b-sjd4gbg( ny06fvy 1ps. If the ball travels 15 meters, what was the average net force applied jf sbvg(b-016gyyd4 nwhile it was coming to a stop?

  02.26: Consider two laboratory 5xy 26(azirsp.+ pecgcarts of different masses but identical kinetic energies and the three following statements. Which of i.s6y(agz5+ c 2r ppxethe 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 inikm-izfiny1e evos. d1n52fv00 ta3z2tial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy whez3kt0 ovfn.2ad1zifvi me1-ys20n5 en it reaches its highest point?

  06.20: A boy jumps fd0t-jo v za+01 7cqcfirom rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speedj+7v-d cqct0 f aio1z0 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 ahe +.dv6rqaeip vd9e79-ia0l)o *vni t cightH 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 resistance is negligible, what is the ma q96 o9)*ptir id-v i7v.cavnl+e 0deagnitude 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 abirs9 om5e g4/oove 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 magnituo5i4e9s r/gom de of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon )3x3np tw;mfx a cord length L is pulled sideways until the cordf3t;3pwxn )xm 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 angled6hd1zl:ui-)v tu2c t . 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.t61:2 )c uditluzhv d- 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 si3dwip s r4wtz7y(+ks .uh5mg9dewalk, 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 th dg m53syu4i.tk+hzw7r9ps( we loading dock?

  12.16: A constant force F=50N (as sho3hxqkem.3dz qm1 nfsone,.pn ) /6j7uwn 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 xp) j6onqm k.zn/3mu7 ns. 31de,fheq=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 u (d;6xpqpr,w 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 bp,xp q( w6d;ruut 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 straighaay(jv4. ez;q;n vk :e;qfeq.t upward with an initial non-zero speed v. The object yej eq:( fqz4v;. veq.ank;a; 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 resistance.

  96.20: A force of 10 N stretchw 7n cursl;o3 p,c(,c61 niysees a spring that has a spring constant of 20 N/m. The potential energy stored in the sp lpyo3s i,;76e 1cccnu(s,nwrring is:

  97.10: A compressed spring has 16 J of pymhgrw:u +jq t)6nx 7(otential energy. What is the maximum speed it can impart to a 2.0-kg object ?xq)nu h +(m g7jwr6ty:

  

  10.31: An object of mass M starts frk6; b, 5hqnaan)yme; lom rest at the bottom 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 trial;yqb) 6h,alm5k;en an s, 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.