97.01: A force F directed atjd 79tu-.2i8os adizt an angle of θ above the horizontal is used to pull a cratt7.a d2usz9ij-io8 dte a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ballqxaiq0+-z ) s-d4wmvn of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her -)xwm q0 z+-id4snqva 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 wallb/ 8i e3yrfqtx)oard 3 meter above the floor for 4 seconds. ) /y8riqef xt3 During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with ugjfk sf4.c l*72 -ojq uniform acceleration on a horizontal surface for 5.00 s. The block’s kineticu*q -jfjcs .74lko2f g 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 horiz9wznv ;,7xoboontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to xo; nozwvb 7,920.0 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 riqe(+ 50bswjxo/2 oagj,n ou5qght is exerted on a 3.0 kg block for 5.0 s. The block/sw x+jebq 50no5ua jqg o(2o, 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 dvlg7cp35bl s :dj x93directed to the right is exerted on a 3.0 kg block for 5.0 s. The lg 7:pxdjcsv3l 9b53dblock 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 initially at rel7fml8d -io (yston a frictionless frozen pond throws a 1 kg hammer in one direction. Afterlify 7mod-8l( 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 kineticuq 6iyzges)pd:u8(5 x;nd( f0x da7s k energy. An hour after the fan has been tur py(quz5 uas8dd n x06;s(gfx)e dk:7ined off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bgcf 3/h3m0se0cp p;)rj irrw2 lock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accg3 mh w/ 23perjsr)0;rpcf0iceleration 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 bookrjpjy/bc+ i bowdz7v -x+ez1+2oom 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 hao+zeyb1v2z/jdi+wbp -jx 7c+s a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wattn41htzz e ):msuk9 en:s (about 32 horsepower) 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 retardingte zen :hkz)m:us9 14n force acting on the car?

  09.13: In the figure to the right, aq/v)okd( 1i5,;b:jt mw bt7rmug r.lu box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelevuqbi7bjlmg .k,( )r:d/;wt51tormu ration 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, a box moves with speedfj qr6i8:)2 ikad ;u 1wt8hp4 cnarc6j 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 p c 8 kif6h ju2rn:dir46j1)w c8aa;tqmass 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 fr/q0feu8 lxt l7muj/3(j2r8. lm qwv1nu:pptkom rest, along a straight road. CarAkqu lemt(p8j l/3uq: 82nwfx07v.m/1ptu jl r 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 F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the t24. l. jo0sxujm;.j 8rkrn1bgxo6uml ime interval of the 0rj86.u;. lms .lkojbj 1ox24 rnmgxu acceleration?

  12.08: Through what distance does the object move during the time interva+ yvv4.bpv 1-v khobaae3/zh(l of tha(ev/3zyva. b ko hbhv+1v4-pe acceleration

  12.19: The magnitude of the linear momentum of a 4.00 k5 njm7e1(uecla/ gxl8g point mass is changed from 6.00kge( lc78gxj1m5e ula/n .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 time interval?

  14.11: A crate gains 34ez8zzxm-v;: y+/ kmlvcs q 3c6.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of th :ze-8zv34kv sc/zxc+ qmyml ;e following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usz8f)l no)df 2jmc33 qwed 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.j dcwnml33 8 )2ffzq)o The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usefluyirc *+pe73)f gs(j ul power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed e+)ul7 cs 3iyjpr g*f(will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of theod /k.wmckhin6b35m 59im 2h q 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 gravitational force acting on the Earth bywhm.n6 2h mk9kodb5ic5q i /3m the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a heizx ui ,):x,wbight ho above a hard floor and released. Assuming that the collision with the floor is elastic, whicib,z,:x ) xwuih one of the following graphs best shows 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 driver +od miz2c kei3+vr9t)sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of tv +zti emkc3oir29) +dhe minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down rv3v4 bhwq5q r5vp;. puniformly until it stops. If the ball trvh.bq5qr p4w 3;5vrvpavels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetiyp1h3qiwy x0n 3 f7j/cc energies and the three following statements. Which of the above statements would be correct?ycw0f3jq 37p iy hxn1/
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 dubkaoju ae0 :3q7:*hy oqshg14 ,c4lvertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enh3q lj7k* gya4eqh: :o1ub dau40c,soergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sm/4rd+w ./oxfqbf g+ qurface. 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 d rqo/fd/+w4fx + bg.qmid 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 object4qxe9fc jc0adb12t9jfj-. ea 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 on the object while coming to re9 jjb.d2q41t-fja fecxc 9e0ast?

  12.48: An object of mass M is dropped from aheight H above the ground. Theoqnvxw,ocq8ug pv92c 029 v9 fwpz,3q object bounces off of a horiv uzqw x cnpgp,98,f 2 0w2cv9oq3v9qozontal surface in a collision 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 mu 6e 5m4ye faj9gkyd-zv)w)8 zon a cord length L is pulled sideways until the cord makes an angl fe)m4 )u 9wz8azv6-ydkg5y jee
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 s3+ ,pzgyp twj n b.w:b7(4kbs1uwxwg*led, 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 s+bptw(:7*,jw1pnw3gk4w.yg b z buxrest. 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, along a 10-meter ra; k ge6ltgv*:lmp 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;k:etvl*gl 6g on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in thedu4m v-c*ak x: figure) is applied for the 6.0 meter motion of the box upwar-4uac:kmx* dv d 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 box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from restlu1y.vpxx ++)if;nw l from the top of a twfxlvpiu1)x.+ +n;y l all tower. Ball 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 6bp7o(a ybum n4q1zb/6a h5erinitial 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 risen76 b5o b1eyz brq/4(hapam6u above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring tha3a28qt wzp(xc .bmrf7t has a spring constant of 20 N/m. The potex2 zbq3wpac(7fm.r8tntial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spetm ug,ns;i d2) 8hqhv29gbxv6ed it62sx;h),guhdqvg9 bmivt 2n 8 can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline *itjlt w : sk/s2deu 9ovd:2fq/fn) f3of height H. A person decides to push the object up the incline in 3i*:vd/2/:dt)qulo2 f nsejf9k t fwsone 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.