97.01: A force F directed at an angle of θ above the horizontal is ulu+.mjxndi wij8h e 3p9*v w,-yr14 yzz;y6 kcsed to pull a crate a distance D across a level floor. The work dxcyj h8 nu;vkjpm9wy6 z w*ez3y+1ir4 l-.di, one by the force F is

  97.33: A softball player catches a ball of mass m, whix:n)yqw, vm gani ae2tfvk,y k2/+ 18vch is moving toward her with horizontal speed v. Whimq gty82yevw/ k ai,):v1fnvxk ,n+a2le 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 kilogram sheet of waor,yx iy96i3ue1+hc: xv fslhccg ,: 9llboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended olhh1c x6g y,ous,fyc::v3xc+ iri e99n the wallboard?

  17.11: A 5.00 kg block slides with uniform av ck3ov.7xmjpd*555 no5 dxwo cceleration on a horizontal surface for 5.00 s. The block’s kin7okc nowx.j555v3o *vxm5ddpetic 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 z-4-nlusquh6ksr8ikv 1j(v hqt *f 3 ;uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Juhl; hf34v-tks1vs r-kqz86in u j q*( 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 d4h/p-m kozhn l7yiu8.irected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest anop/l 7nki.umh8y z4h- d 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 rigft73osfn4oug p49 k +bht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides oks97g bt4n4+ofou 3pf n 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 p-lc/3s3 lwbpy ond throws a 1 kg hammesw33p -cbly/l r in one 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 the ai4sboiw1s4* iio7w6)crwv8 -- ( w4w i abikaxzr and gives it kinetic energy. An hour after the fan has been turned-*w1wi-i4ixw(v8 rb7k6wss oiciaz) ba4 w4o 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 of 3.0 m, a speedh2+ hz/6hehr e of 4.0 m/s, and an accel hrhheh2/z +e6eration 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 bookroj 1grd0 l7dn. :y3u6tvvipp3lom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor1u3dppvy70t 6vjd3ni. :l lrg, 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) owq7ofg w/4o 1xf power to a car's drgf/o7w1 o4xqwiving 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 box moves with :nv,tg 2mry6j2z9t ilspeed 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 th9ty62nr,gzl:m tvi 2je 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 j dr1)bj oo8zfy52m,qked85e 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 the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/sj bj)52red8eqdz, ofk m8o1y5when 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 c5 3ffm4bxbszn 2; /mhstraight 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 bm5bzm4s;f 32xfc n h/F, what is its speed in terms of B?

  12.07: What is the net force acting on the obi/xlgtlut w +*--6ngnject during the time interval of the ac- /gni lwtut *-6lngx+celeration?

  12.08: Through what distance does the object move durk4 sj3v*/ enl d pnxl-6phjgbwiq44br 9y,,.oing the time interval of the acceknpe43- w*blj.d4 yiqoj,9,/6 npr hxls4vbgleration

  12.19: The magnitude of the linear )taji j4a+rrb;y .re ;momentum 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 chang;y;.4eabat jrrrji+)e in the kinetic energy of the mass during this time interval?

  14.11: A crate gains x htai )ygb7-436.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mih7xa b)t g4-yass of the crate

  94.38: A force F at an angle θ above the horizory( zk2ds-s;bp ek z,0ntal is used to pull a heavy suitcase of weight mga dis,d0pkb kes-(zs;2 ry ztance 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 fi :8 /n87aal5:5vtvyu xldmman upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At7vmy d/8:xvmant8l5u: f5 ial what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is re4cc xiuut --:gfyx mv+h.i+,5 o1scwbleased from 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 followi.mctxiwo4 b +:+uv yf-,h s-1x5c ucging 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)t ;s(nwh/nf f6 3ezlq and released. Assuming that the collision with the floor is elastic, which one of the following graphs best showh/esz() wnt q6n; 3ffls 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 driv-iitw, jwsu7icqol9 )lez;. (er sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessar.;uwoil)t7(l w 9jqe,- zicsi y to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If*.k 5+hyhdo )ff+tx mm35xywp: sh4fc the ball travels 15 meters, what was the average net force yf*y4h f+ howx mxd:mh5f .5kcst)p+3applied while it was coming to a stop?

  02.26: Consider two labojggdyp *,+gqz/ovmv ;b a+2o4ratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would gdo/z4+ +v*2 jo qabvg;gpm,ybe 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 isw:voe5t) a;ji tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chantwaje);v i 5o:ge in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flah3 xeacs9 f*9jt, 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 averag a9j9x 3sf*chee 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 drop1spi. xzb5*q bj c0suy6fu:k9ped 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 resistance is negligible, what is the magnitude of the average constant force exerted59.qps y0:fb6 uc zj sk*uib1x by the ground on the object while coming to rest?

  12.48: An object of mass M q-dcpfbw; xppr ,w51:-g3v-9v l m vtjis dropped from aheight H above the ground. The object bounces off of a horizontal surface in a colliwv,vfgr5p j;wpc 31b:td-p -- xvqml 9sion lasting time T. The object 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 sidewale 3:e)u5.w(gdq q6 lh6yise619jviso a(t eyys until the cord makes anl(gq6 e66tey:i9wh) qs lusye5e1ji va(d . 3o 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 angle. r;2u)9oi ,onk04d hcdfb4v s fThe sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 mr h0vosd)o d4n,ufcki9b2;4f 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 cajdfh:x. np83 zrtons 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 thepd3nhz :fj.8x cartons to move them to the loading dock?

  12.16: A constant force u;4ku3 dgy9y3bt- :x* p ldjtp5j,blhF=50N (as 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 choices best represents the work done by the force F olu*ty9 hbxdb3d gptu 5,jy;p3k4- j:lnthe box for the motion?

  04.48: Two identical bowling balls A and B are each drop3xn1nbh0 ,l yjm agw0-ped 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, hox g,am1y- jhnnwb0l03w are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M strwf ys:/d up,h;aight 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 rise above thdsy / :fuph;w,e launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/qb0 :/l t8z68+i+lui6dlla.nco wdmwm. The potential energy stored in the sp6 bda6 ln /q+ m:8+lli0izd 8owl.cwturing is:

  97.10: A compressed spring has 16 J of potential energy. What is ; us7;czl eqqnx if928the maximum speed it can impart to a 2.0-e8f 2q9snl;uq c;7zxi kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline 1vl h c3;h0fupof he3 uhp0lfc;hv 1ight 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 and the object for both trials.