97.01: A force F directed at an ar9i+jn6w1su/0-ejkr -c l yb jngle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the foryue1-9r -wsjkc 0bn 6ij+rlj/ce F is

  97.33: A softball player catches a ball oi:al wa*f +k-kxf)b 7ff mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontaka*i: +b x)l 7kf-wffal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboar* ;rd xt7bdy;cd 3 meter above the floor for 4 seconds.7dr;d * tb;xyc During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerationj006pmri (2p0. fl0l zczwgei htlsd5q88 l2j on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 5d t ms0jp2 6fp.grz0c (h8el2il0ljqw8lzi0J 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 apya0k:0ax 4x3psdk8 dtc + c,ucceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strict+apdx d8 0u4kptk xy:,30cscaly 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 direi:rep*)wyg5dz:9 * wq+c rddxcted to the right is exerted on a 3.0 kg block for 5.0 s. The blocw: *i)dcgdrr5p y+x qd*w:e9z k 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 the9pww* di x3--: 0gbqgne uyr(i right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonwqirnwg g d:- b0e3(x*iu-yp9tal 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 pond throws a 1 kg ;r 6txqt2 c(ss;e3b ywhammer in one direction. After the throw, the hammer moves off in one direction while the stutscq brw x;;2 3e(t6sydent moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives itaj8wwj mu//zz k7kz* 7 kinetic energy. An hour after the fan hw zjm*/ k7ka zwu7/zj8as been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5mxpo /in1q dwr7wz9;9w; *wnfz -8txn 0 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration of znp/9imfwxqwz71-;w d8t*n x w9;n or$1.0\; m/s^{2}$ . 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 m from r9iu2 e8h5x qmm;ght9the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, 5rtiuqhe 9g 2mh;m89x how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivylqumwl tyq;4. 0 -a4mers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 3 m0q-4y.u ;mlq4awtl y0 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 the (k 1em-*deoaw lqoq++7 z bl;abottom of a rough, fixed inclined plane. The box slides with constant accelerata7-le b;l z*m+oq( ak1+wo dqeion 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= 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,ff8 o2x,j74 lm/xpdkc 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 of7f xl,k dj8pomx4/cf2 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 1 m7c3qc zq0d8ga ebg,);v +x,pk ulzzthe right, each starting from rest, along a straight road. CarA has t)zcc1+va0 g83,qm qgxzuz ,;d kp7eblwice 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 1 xc15e(rwv d5z4r ssfacting on the object during the time interval of the accelerationsrzc415v s( e1fdr xw5?

  12.08: Through what distance does the object movij g:qs*p 90qq( vzzbvz*c ae0c1l+3j e during the time interval of th(1 *qz*z a vq0j q+9c pjl3vzsbieg:0ce acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass 6jp80w7hv kj jq1a9rbkck1vb, bp)1cis 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 thispkh1c6c7 ajpbjk1bv r vk 9qj,1wb)80 time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed h4i pj.bl18fn )q7dhjis increased from 2.00m/s to 4.00m/s. Which one of the followingqjnhh8b41fp.j 7dl ) i choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is useb*n 49is5uzub d 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 work done by9b5su bi zun*4 the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outv 4+a6vm;v xpkput of 0.10 w to raise a blocavk vpm;4v +6xk vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the wa qn4qv)9-tosurface 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 followiot9a )4q vw-nqng 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 motio95lillw+du/e nless 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 relatie5l 9il+l/w udonship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at bu0. + xjad0wt6i1hmd 28 m/s. The driver sees a barrier ahead. If the car takes 9dd t+ ija.xw1h6m0u0b5 meters to 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 bl,gf+h;hip t0qdkj8y8 :n-mstops. If the ball travels 15 meterlb+ 8j0k-:mn fydthgp qi;h8,s, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory w(uw sh 10jeu, 1ny:apcarts of different masses but identical kinetic energies and the three f w: uwuje(hsn,11ya0pollowing 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 zyzsw +)ef-zx nl8 m c.79cbb,air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enez)b. l ,c+cz9z7fny8bwems- x rgy when it reaches its highest point?

  06.20: A boy jumps from rest s/+1lzbrhddvpofh0 *m ;i 9-satraight upward from a flat, stationary concrete surface. The boy, of mass M, leavesr*dz i01+;h pmhb- ls/fo9 dav 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 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 grounepo -:t+:pe mhqy*et yg 3s+b,d. The object crashes into some soft earth and comes to rest by compressing the earth a diyeey:tto+m+ 3 e-ps,gh bq:*pstance 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 n ,f2c b y9jk:kcxvb48above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upw49 nc:vkfck,8b bxj2yard 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 sidewaysy ia418p;v6spj 887 zqqslbiq until the cord maqbl8 1 vyi86s7q;s4i pzj8apq kes 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 unknownx zdbryy1.46v:xd5f g 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 posigb 5vxr6f d1yxy :d4z.tion at the bottom of the hill?

  06.09: A deliveryman mo4 xt o+-xyrfr,ves 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 the carrty rfx-+,4x otons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure.u5b4.pd,cr:9.f mx ewk vlpm ) 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 ,. l udkmm4pwcvb:p.er5.f9 x force F onthe box for the motion?

  04.48: Two identical bowling balls A and8gy saut:7c 2v B are each dropped from rest from the top of a tall tower. Bal2 s8ctuay :g7vl A is dropped one second before ball B. After ball 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 in2alhuw;8y9 a66 eih xhitial 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 ;y ahl 6i uhw28x9aeh6upward 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 stretchesi3)6.cag 6jg3mw7f relg8d uf a spring that has a spring constant of 20 N/m. The potential energy3i 8u.rfdw6)7a m6lc gej3 gfg stored in the spring is:

  97.10: A compressed spring has 16 J of po1 e39 ohsnyiza rq)9j2tential energy. What is the maximum speed it can impart to a 2.9h iaqes9r1oy)j3 2zn 0-kg object ?

  

  10.31: An object of mass M starts from rmg)yh3 aa(,vhxb q:+y:smj (best 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 object reaches the top of the incline with speed V. How wouldjmbyg h(vs:y:),+mxa ba q(h3 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.