97.01: A force F directed at an angle of θ above the horizore c b;smdul9 2.e10nkntal is used to pull a crate a distance D across a level floor. bnu ek 2c.d9 le01;rmsThe work done by the force F is

  97.33: A softball player catchj/ rle -i b :q(c/i09t6hyoeibes a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ballb-6 cit/re(ie:b yjo/ 0q9 hil 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 ofpx7o 6elmudw08q9 zcp6rw:3q wallboard 3 meter above the floor for 4 seconds. During thpxrou9m c 6e7q8wdlq0 z:36p wese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block 6wvg 02gkf5x bslides with uniform acceleration on a horizontal surface for 5.00 s.vwgb5f6 k2 0xg The block’s kinetic 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 sli)jbiw,q7 n7 y*cur7xzr(vr)0a owd0r des with uniform acceleration on a horizontal surface for 5.00 s. The blr0(cxz 7rarj ,7)n7o v) dw0u wyirqb*ock’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 directeij9c2xvn 4t60q mc4j td to the right is exerted on a 3.0 kg block for 5.0 s. The cvti 4mt9qjc0 n2x 4j6block 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 yjme2dg )bo /;force directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest andd ey;jm2o )gb/ 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 frictionless frozen pond throws a 1 mlw lgm8yv07o,rd ; d-kg hammer in one direc8l0vo rydd,7- mlmg; wtion. 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 air and gives it kinetic energy. An hour afteoh6o)y ;z(ljw )bogi)ld *,ldr the fan has been turned o(o ;)dgllj6hoo lyz))*d w,ib ff,
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 sp4b 6- 9j1lvmbvhd2pe ieed of 4.0 m/s, and an acceleration om46bh2b jip 9 veld-v1f $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookro :.;ihwu)+v kx3cqntxom 1.3 m from the floor. If the jnq +kxv)ux :wihc ;.t3anitor 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 has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horb3i8u umlj cb ;76e5xisepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what 8lex im; jbi 567uc3ubis 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 d 7awd 0s8cy0eat 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 dire sdwye 7c0d8a0ctly 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 speed 5.00 m/s at tn x ew02qj 1(pyqvc(*4/(rbfg;xutdg he bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top ot*xq;fuxg(bvr4qnd/ 2pw yj (gc(10e f 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/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 hpf)o 4; yy4muthe right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A u;ym4p o)hf 4yhas 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 time interval f6 f;xsgw 2q3 1;gjwmp.rp/swof thwxgwfp;rs6 /p m;qw 1 j.fg3s2e acceleration?

  12.08: Through what distanadq+2nm2va vwd)p8:qgg( -4 s3cgva sce does the object move during the time interval of the accelergm +q :gaa-8v(sw dnv3 4sd gacvqp2)2ation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass i3rvo4:ya qarml5e5u,s 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 o4 :5ror,mlv3qye 5uaa f the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whilec319+r t g atcdmj1:czm9o0 nh its speed is increased from 2.00m/s to 4.00m/s.1c+9:d hjg93onr0m1 m zt atcc Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is us 6q 2dq*eww)6uv zpa) sui1:jxed 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: * wiaq uzwudjv)6es1 q2p)6x work done by the frictional force is:

  14.31: A toy crane exerts an upward fr+ czp/kkj8d1oar p86orce and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At wp1d r /a68ckr 8+ojzpkhat constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the ka1;7m+ulpun 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 fallsn ukp 17ul+am; 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 by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard u-in2 ,4act.blsi4sqfloor 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 ofcli4ss.ai tn-q,42bu the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver seesdabjq1:vblqe /8 u1jw.nw/ 4 k a barrier ahead. If the car takes 95 meters to comkaublvd8.4 :n /j /wq1bjew1 qe to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving ae n rr wlmvjg0/rdoa24qyp67b2+ -7feqtm* 5ct 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average netb fr 2peve5+r qmlqgw ja/yc6* mo740tndr 72- force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic 8)kt5p *iimga energies and the three p5gi *)i 8tkamfollowing 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 bho ;6 edt7u+gtossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potenti eb+tdu;ohg76al energy when it reaches its highest point?

  06.20: A boy jumps from rest s(q1wjx6lw + jqtraight 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 physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the (j x wl+jqwq16boy?

  02.48: An object of mass M is dropped fg :e+i- +.mt3jlya m8;lu .0fcv+kyp4f vqd kfrom 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 ff+gdyf uk8-;i l. c favtkmpel3.m 0+q4vj:+yorce exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above c+sy,p+ps hg+ the ground. The object bounces off of a horizontal surface in a collision lach+ ys++pgsp,sting 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 sidewhb5 nzc7k 8z1bays until the cord m7 cz58k1 znhbbakes 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 unknown angle. The sled, cvek-, 1l5r5ne d k9;in-qjkgwhich 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 the-5vk9n qee;-k,15ig ldc krnjn 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 movewdz17 .h5s1f5dpw jd7lz d5b zs 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 de7zb551 j1p ls7 w.dhdwfz5zddliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appliesa.5kbhr50mi- ech-hg-7b m ; ety2aod for the 6.0 meter motion b;a.i5gk etemh 0h--7ma52chbs- y roof 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 box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fromhoskfbn8 875hxcl /f/ 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, how are the mechanical energies of thfo8fb8/7c h h5/x nslke two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-z dx0df 1f-2pj ot);efbero 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. I p;01defjdb2ft fo-x) n 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 stretches a spring t4k 8pukk gsd7;iq)t2w(zh,; surh9bnhat has a spring constant of 20 N/m. The potential energy stored in the s4wpi 2h;skb,;d 9ur( gkqzsh 87utkn)pring is:

  97.10: A compressed spring ha5q ;1zb n wh/ecq: zwtn.a l22jshwp18s 16 J of potential energy. What is the maximum spee;lw5.n 2h ac2/8tjbwh :spznwq ez1q1d it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of afwi3 vxx1ai n8c6b9:z 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 would the work done by the person on the block ci1 3bwfxznaxc68 :i9vompare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.