97.01: A force F directed at an angle of θ a*+*b /yv0,j.c mq)i k prvhe 3lhbb,bebove the horizontal is used to pull a crate a distanb.l j,hk *c )y +*ibrebqmvp/h0e,vb3ce D across a level floor. The work done by the force F is

  97.33: A softball player catches a . +);htp d vcpgyiiej48d4qj:ball of 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 horizontal force exerted i;:i+t8c4 ey vp d4p)hd.jjgqon the ball by her hand is

  99.14: A construction laborer holds a 20 kr6o :8 1 ,7ppvmjisjspwr8-:puszjl2ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard? 88pswj-7lp6 i: p 2rj,vmjos:z spr1u

  17.11: A 5.00 kg block slides with uniform acceleration on a hw3qqh )(a;ox1fwa8 ktg +tobo3( pzv 3orizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Jtao8 h;ozb avp) 1xgtwq+(k(333qfo w in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with unidf5h61k c)tqvform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 6t q c15hvkfd)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 toe(q-tpe7j k 9l vmja+kg p4gzwcs+wvv6241-a the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slid pvw1p2 -g+ w mjtze4(j7 g9- +k6kq4vacsvelaes 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 forcmkn+ t:b3 n k/ks r4q0hg0*xrwe directed to the right is exerted on a 3.0 kg block for 5.0x k+qnm:gkh003wr n /tsb 4*rk s. The block 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 reston a frictionless frozen pond tvi ty/+9c) kfdhrows a 1 kg hammer 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 correctt v)+y9dkcfi /ly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy86aozttcom-3/wjiv ( . An hour after the fan has beei6mza3o tw/vto 8( cj-n turned 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 q p ng+izz56n7 l+chl0nil fv+q3w5sf-b7r8wposition of 3.0 m, a speed of 4.0 nf63l f0 zi+ z7wl-ic5nhnp+rqlbg 8w+v75qsm/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 text *51t fwp ok.f6s+0abj/w knjtbooks is on the middle 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 the floor, how much work does he do on/twnjpk5*k+61tsabjo. fw f 0 the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horia d+bzkf 2e:5sepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), web5f+ ia2:dkz hat is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves wujsvi+e.uyp9n035 dw s 33wlb ith 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 it09v3uw jswb3u.3p5sdey inl + 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 speed 5.00 m4t 8qz wruv70k/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. 47wukrz 8t qv0The 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 rest, al;cvjl5* s8yf zong a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, C f8jvl5;sy c*zar 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 time inm94rr4cpesw 72el; r,js sk4mterval of the accell2,rrsk47 e94m4 pecwrsjm;s eration?

  12.08: Through what dill7i,u vud 86tstance does the object move during the time interval of the acceler6l,8iv duu7t lation

  12.19: The magnitude ofz89;;kz6*htmhdo s xxnzxk5) the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14. s6 k*zox x9dn xh);t5hzkz8;m0kg.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 36.0 J of kinetic energy while its8 h)gs6 vmq d0ie:1*dp)wxa vx speed is increased from 2.00m/s to 4.00m/s. Which oned 16qsdi*w0gv)8hxp xem v)a: of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pulf hrl 4sfh fg870nb,6tl a heavy suitcase of weight mga distance d along a level floor at constant vnb,h tsfr f8 704g6flhelocity. 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 an upward force and delivers a usefulq*b4b8.ev )uap dky;2lh rjf p(ar0r0 power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed fp urh*0braj)e0dq4av lk2p8 (r .y; bwill this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near x7pqq58t g ns.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 followin sg.8tqqx5np 7g 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 a bl *nysvz8 2w )p.k(by+2wbmh 2z7lkho above a hard floor and released. Assuming that the collision with the floor is elasticll)zmvws7 w kpa (hy2bn.* +bk8yb22 z, which 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 b+xglvqn+: bcn t, 6,32rvb,et /wqas moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters2:b+gv3,qsteql wa, +ntb/r v6nx,b c 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 unifor,rj8lm v 5w/zb:qrzm: mly until it stops. If the ball travels 15 meters, what was the average net force wzz/ vb,:jrr :mq l85mapplied while it was coming to a stop?

  02.26: Consider two lgf x h;9f06yp6alayx: aboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above sa60:pl6 gfy yx;fhx9atatements 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 verjyv;c )k. c.g4buhebb;5,x52oqhtxw tically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?gue; b,)4 xbc2ybokcwh;t5 j.q x5h.v

  06.20: A boy jumps from rest straight u* lv(awzs(tqwj:(z (upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface wizqw*awuj((z :(vs(tl th 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 fgfytflef n8 7dqop6;/65/ .g xa gj(eyn gj85above 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, w onya jn6 / ;g/ g8.ggeflpt5f 6xfqfj(87ye5dhat 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 above the ground. Tf791 luwwx7.hclt (yohe object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward .c w(h9tlfu wy 177lxoto 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 pulle2jn /xhie 2q*hk-t-u4fn d:p cd sideways until the cord makes ahkju/c t-n i-fqhe2n:xdp2* 4n 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 sari3 s46r*id wled, 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 oridwr43 a 6i*risginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp hx2u8ey 5t g1mto a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the y8e1 ugx2t h5mtotal work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant forc;sj2uo xrp5a. /k*q(xo g6sjw w.nqj2e F=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 follo/w*o j 2skr.u6pxn gjawqs.2o (;jx5qwing 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 drop89r7 b0flu) n1ty qqsoped from rest from the top of a tall tower. Ball A is dropped o b8q)7 f0nyu1qst lr9one 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 initial nonuz+ (* :oukeb*a x8jo2go fb+z-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 th+kxg2ue j* +o *z:zbfuao 8ob(e object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a szja1 j 750muzbwxobc;by85q 1*p w9gppring that has a spring constant of 20 N/m. The potential energy stored in th bbpjc 851jg5w aw9z1;mzqypu b*0x o7e spring is:

  97.10: A compressed spring has 16 J of potential xlwsm1ov6 u ;;gtcgc+ef++. i energy. What is the maximum speed it can impart to a 2.0-kg o e fo+cg;g+6wm1s+. ilcvux;t bject ?

  

  10.31: An object of mass M stz4wzxn e4nx. bmzl,nt1xt)1+arts 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 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 triall)tz1 xz1 4m.e,t4+nnwz xn bxs.