97.01: A force F directed at an angle of θ above the horizontal is used 2 .if qlq1.vji6 djesj :yn(,jto pull a crate a distance D across a level flo1f.eijl, ijd sqy.n 26(:jjvqor. The work done by the force F is

  97.33: A softball player catches a ball of mawn 2.dcwuhid /5f n 5d;gs;it/ss m, which is moving toward her with horizontal speed v. While bringing the ballfc nd;wni./ /t;d52hdgsuwi5 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 holxx0x psjy)yr- y:*4xn ds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During xy 0jx-*xsxynr: 4)pythese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hok9 xlxf).0o2 ej zoulq-y3u:n8 i 5jvvrizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this o09x .uzx8-:u3ky5jj l)vq2 neo fv iltime.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration dczn6 ei9jfiv ks+*;7on a horizontal surface for 5.09fc7 i; s*n6jdievk +z0 s. The block’s kinetic 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 t iz.jq5v 6ulv5he right is exerted on a 3.0 kg block for 5.0 s. The bl55vj .z6quilvock 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 rigkvvv ,s8jp+sw4 v m15 qvli)(nht is exerted on a 3.0 kg block for 5.0 s. The block was jvw1q,v84 vp+is (vnl5vm )sk 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 frictionless8eb ;6j pyyy ;q)pwwx5 frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves oyp wbew5 ;x)q6 8pyyj;ff 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 ;yph9kklq*7nx*4 ba t fan has been turnpkynk4a7l t*x9h;*q b ed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kgc*,bywd2) tpjt(aw +b /iq 3hh has a position of 3.0 m, a speed of 4.0 m/s, and an acceled wj /i*b b2+htt3y)(cq,pwha ration 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 amgnt50k dl22 the middle 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 floor, how much work does he do on the box. The box ht2 0kdlg5n m2aas a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsemi+( +3,eiqh pjhnr, hvg o;.tpower) of power to a car's driving whei+m,eoiqp,3;g+jhrhv nt (. hels. 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 box moves with speed 5.00 k+hl w94/.b ea zkqv -sht *eib5)sstdl5fx+6m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to tbfvte+z9eshi l+s b/ks. hd)x *4k55 q6 wta-lhe 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 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)2kd- w 8-fter7ewcl+9 kfs(irb3vd l 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 inclilciwr) t w8drkv2-s9(d7k-l+ beff3ene 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 startingj hq*) vsjl,;(ohcdy0 2zawwys .+-t h from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a dh0)z, ov hj ( yhssqty.;2aw-l+jcd*wistance 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 ont 1d*wcp 6dhy7 the object during the time interval of the acceleration?y7*dtw 1h6pdc

  12.08: Through what distance does thv wsm4 )lcz;5ke object move during the time interval of the accel4) m;z5lcvws keration

  12.19: The magnitude of the linear momentum of a 4.00wif9i )rqha 8w;c .9by 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 8.fbc ;ywq 9r 9wa)hiiin the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed 03k/ls yt,2 aou-emj zis increased from 2.00m/s to 4.00m/s. Whio2y/,zeslt3-ak0muj ch one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizob7ki gxk.ni+6p-saa 7)lk x9n ntal 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. The 7 7pnkiksa+-xlgia. k6)n9xbwork done by the frictional force is:

  14.31: A toy crane exerts an upward forc*+f. kj fybfjvn0 )q(we and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise fy (fbn .w)j0fv+kq*ja 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, theo+m g9 ao o;)36 rpg3qbs)sqji 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 thsmr; qiojs9gb3)o+o 6) qgap3 e 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 abkgsm5-f gr.;move a hard floor 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 the surface? r.5mmgs-k gf;

  07.06: A 500-kg car is 5ezvwrq1p+gdc3iy y/ 04bc7fmoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is theg 73 wy/ 4ce1+br0i dfvcq5zyp magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowoq0n.y nup mz(f8 9y+p ,rw0q e):oawis down uniformly until it stops. If the ball travels 15 meters, what was the average nwpew,ionq)ro ( n9fmuy8+ :z0 .q0 apyet force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identicalbnun9 )tqyw;b ctqh0x4ytip5w 7i .;d 3nm;)y kinetic energies and the three fol 35mptqhwxyint)ub 9y7 .c;w ty4qi;bnd n);0lowing 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 is0,e tlin*n 5lwsm7 (ujmdle0cl68ei/ tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its poe/enw7(,i0i llmlsecn juml6*td08 5tential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight4 lnah-:ir yn9 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 phhr - :i49naylnysical 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. The objwk6xqpk)vh zlm k5t39wh) q-zqu/0w+ ect crashesw)m+lq/hk6zhpq 59v zq uw0wk)3 k-xt 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 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 the bv /vd* w0f,-dnvs o6qjog12wground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximumov0 1on*gv6/sd,2 -vbqw wd fj 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 yhju+5/d uc8ln: bx w*7six:kpulled sideways until the cord makes an angle8/:nb:*+5ji luxuck 7 hsxdyw
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 u;fvum .z+o zz:niform incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a hovmz ;z:f.u+ zeight 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?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alongk/ptyj+ ieo.k3i9 3xz 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 worktj.9k xi+3ezp ok3yi/ done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applie1-w onbi. .7rxr/iygo -q,ehzd 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 i/ z ei -1oo.xw.-h7yrqrn,bg done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest frocrh wbfz,he, i)s3xou(+h -4 im the top of a tall tower. Ball A is dropped one second before ball B. After ballie3 h,x)fu+br,4whh-i(c o zs 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 straight upward with an initxnw0ygxc70 k2ial 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 initin20xx0kycwg 7 al 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 10mivc-cr/hvbs1. v. y/ N stretches a spring that has a spring constant of 20 N/m. The potential energy stored inr h/micyvbs/-v v.1.c the spring is:

  97.10: A compressed spring has 16 J of potential energ q0r0flm7 +t)huqj*a wb /zq.dy. What is the maximum spe)hq z.blqr/ jauqdm+0t7f w*0ed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclin7 ,7map:*rkurm/ skcp3s -nwqe 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 kinetic friction between the incline m ,prmscq ars7p3/7nwk:uk-*and the object for both trials.