97.01: A force F directed at an angle of θ ewj.3tnqi2 pal ;t2j( above the horizontal is used to pull a crate a distance D across a level floor. The work donealn ;qi.j 2t3pje 2w(t by the force F is

  97.33: A softball player catches a ball of mass m, which ii d m/3uzq5woi9.0c.hpkn-w ys moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming cons/ 9i3 5.wycdn-h0uopiwkqzm.tant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet.if/0q,1 clcz wqtkq)wwv e. ; of wallboard 3 meter above the floor for 4 seconds. Duri z0wqec v/fwwi,1l. tk.;cqq)ng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block ./hbqz) w/m/un 2 wjnck rvtqou59bxp;n23* vslides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictlqku)v*j/ q 5 tbuxr2nmh.cp2/on/ n;3 zw 9wvby 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 ag,*. obntx hqqz60 h9scceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.g,0q b h. sthox9*6nzq0 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 s3 5xehtwh or.-0jf. - vncop4to the right is exerted on a 3.0 kg block for 5.0 s. The block 3.n0orejhspwo x - .v -thf4c5was 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 i )1a8e4z dbsbes exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface ba8d e41z)esb.
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 z jo )s(gt-z2p os.mn1oniia l./4uq*throws a 1 kg hammer in one direction. After the t2 s*n4n-..j1a sq io (/iztumgz)oolphrow, 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 h zfv w j+h5*bbtju:5+air and gives it kinetic energy. An hour after the fan has been turzbj b fw++h:hj5u5v t*ned 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 positi ymf*wp,1k4q6pc;m6x gdm*yfp r z+drs. t6g +on of 3.0 m, a speed of 4.0 4g. mzp661*xk ;fp qtm ,yr*p+ymdw+s frgcd6m/s, and an 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 middj vw5n ;fzx5r:le 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 rfv:x;5z wj5nthe 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 waterh9 p1u4c/ 1fc4xhg4i 3ar ylts (about 32 horsepower) of power to a car's driving girpc1 4 1h3f/ h9uecxrly4a4wheels. 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 m/s at wui2fjq38um+ar.dsv ntx1t .d)9q4p 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 box, of mass m= .)xuta n2 vid9t rqjp8+f.wdmuqs 34120.0 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 u s mjprh hbiy7t8c tn:(g.oh/6f1+,m5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the inc os78hchhi+tt1brg,/n f6:pym. u jm(line 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 resc, g-n;h zyl8nt, along a straight road. CarA has twice the acceleration of c8nzg; hnl,y -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 jj/k scg,4 dw*time interval of the acceler4js*w/, dckjg ation?

  12.08: Through what distance does the object move during the tifz+y8ab 1uq: cqwle*9me interval of the accelb z8af+:cyl e9quwq1*eration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang g.(zr g yt;6xuw;i 1+od5naosed from 6.00kg.m/s to 14.0kg.m/s in a time gow.r 1oz6ng+yud a i(; x;s5tinterval 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 speed is increrod wvc i/m- eo6a 5x/qie*-h4y4,icaased from 2.00m/dvmw/c6eiqy5-i4, hoaer/c o*a xi-4 s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizo82 uysi9e s e275lezzrntal 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. T278 y9seezz5u e2sl irhe work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliversh8n +zpk i2g7 p 3*wcmd-w7qif 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 md2w3 *i7iw8 g - pkh+7fpcqzna 0.20 kg block?

  12.18: A 1.00 kg object h8fv :ci je (q:r2t8pkis released 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 following choices best represents the amount of work done by the gravitif 8het: v:k2rcpjq8(ational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionle8: lm4 5,vdazd5:nmj ivo;jwvss a height ho above 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 ha l: 8id4:v,5vwomnzjd5vm;jeight h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The h+it:*qi7da ldriver sees a barrier ahead. If the car takes 95 meters to comel7 dit a:*i+hq 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 sty.dclqi 0(a ;/+ 2 ss7h0xicbmfi7xkpops. If the ball travels 15 meters, what was the average dc+2c k7 s.0fp7 b(l x/ixhyisi0qm a;net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masse(rcuk4el gd)p+ 1y7f1.ewklq s but identical kinetic energies and the three following sld u7wkr1y( +pel) q fcg4.1ektatements. 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 incm(c5 r xb hd1lqrbn/+ t8s91mitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential eb m8 x hdcltb/+1n(1sr c5mrq9nergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary c/ . pesmsiw/h4:o ngi2oncrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass ri:nei isosm /42wh./gpses 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 aheighy 8yzd)aa83 getH 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 exerted by the ground onye a)8dza3gy 8 the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H 3d,uewq3g* rnx09wuv above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The obje,9 0 r*dxn uwqe3gw3uvct 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 side r,uc;((.lglu )h hgt:igcg5kways until the cord makes an angle u)ckg gg(;l,l i.h ruh g:t(5c
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. The sled, wh3o-wawn p6a y(ich 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 th-(py w3wa6 anoe 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 carto4zq4n hyp fyn 3v,36hqns 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 mzy3hy,4qhqnvn 43p 6f ass of 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 shown in the figure) is applied fom 9piet6)st(lv anm))r 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 bo9)(m) t astipmv)le 6nx for the motion?

  04.48: Two identical bowlot- fhp -vvnc/gn,1 dy4:efe-ing balls A and 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 drop,4v e c--ge yn1dtn/fohfv -:pped 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 init 9 omowzfhy29 v xu bh*,d4ewdz fjy)e)*.bq(-ial 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 the launch poinf9.eo)-du)dhh zx* ,jyo4vb fw(*b2 m9q zeywt? Ignore air resistance.

  96.20: A force of 10 N stretches a spring t8z o68j;, /bcr :g; b4wx5 hctfsxlhrfhat has a spring constant of 20 N/m. The potential energy stored in the;f/h8txcbc4 wf8xj ,hz 5rr6gb : los; spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spmt0u l rr.-c7w. syeadsx .o4;eed it can impart to a 2.0-c.uxtdsy 0 7emr 4 l.so.-;rawkg object ?

  

  10.31: An object of mass M s7r) cf -bto*oatarts from 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 trials, the objfo)7tb o*cr- aect 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.