97.01: A force F directedu. qh ue4b3cc*za1k0y at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor03 u*k qu.cz1aehybc 4. The work done by the force F is

  97.33: A softball player catches a ball of mass m, whp* f sj4r* el6(g*to o1qhpg,blr /fl6ich is moving toward her with horizontal speed v. While bringinlthp be ( r rlgl*o6jf*pf,6 s*o4g1/qg the ball 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 of wallboard me+8vy yi4;xh3 meter above the fh4yyv 8+ me;ixloor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerat*(yko4v2 mith ifg m7cb+0l3 oion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this timey0b(mm4vctog2l i hfo3 * +7ki.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block st3yekf s.fdn w)6e; -k l)j; hqo70yfulides with uniform acceleration on a horizontal surface for 5.00 sf7q;fhed0 e .nl; k) f63k)j oytuy-ws. The block’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 directed to the right is exerted on a 3.0 h)++afsv yy2avt5 t v+ .wl-aqkg block for 5.0 s. The block was initially at rest and slides vyf5+s la-h wtqa+t.v)v2+ya 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 5ii7( mivg k590wt8adu6qkkp)m-je v is exerted on a 3.0 kg block for 5.0 s. The block was initially at r gi(uk57i8kvj vme ta-0q59md ip)k6west 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 res 5sa ehrxg,;k.ton a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in thka;g hex,5sr.e other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An ho1xe tan8h0e 9vs h(c 4lx1-swxur after the fan sex(8-sx9tc1hv1l 4awxe h 0nhas been 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 position vbd epdc;fyq/0 2 vm47of 3.0 m, a speed of 4.0 m/spbdvce 24v7;dymqf 0/ , 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 textbook*wu;rr (q9x p 85ng6hpk p isksld3e*/s is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the sr85spd3r(i gk ;*wl9 psp hxnu*q6k/ehelf 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 7z)e 33 r0rbnushh (jcv) c4kj32 horsepower) of power to a car's driving wheels. If the car ma 340re)(hrkv cs bj)hj7c3u znintains 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 t7o gr1; )z;ti5b c5w xto;rlvoa zv:a9he right, 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen zw;xbovl9taavz7;or1io g;r t c5)5: 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 th jr8*mz (nxfj)y.i a9le bottomz rx .j my*n(j)fila89 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 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 (9n7. plkf 5extshg.jthe right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speedsnf gp. e lk7.h5j(t9x 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 intliw0 pxb9;h mg;gz)4j erval of the accelera z0)g ;blgw49mph;ixj tion?

  12.08: Through what distance d+jxln x 6gx yozk:3j33oes the object move during the time interval of the ac6jzxj+ 33 lx:g xonyk3celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point masv/oh-y3qff b36d u urv2x 1kbtp05b/ ys is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval uo0 x-2 d/f365rybfp/u1 q3kv bbthvy 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 ikr, o66jg ,a;qpy vzbf 1(p,oss increased from 2.00m/s to 4.00m/so(6fpk b,j; ar6qz,1 ,syop gv. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above tnzz2 d8.w ssw;he horizontal is used to pull a heavy suitcase of weight mga distance d alo;zd8z2. sn swwng a level floor at constant velocity. 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 upwu0sq.cub7z qn+ .xyobb)3 +sy ard force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed willsz)0y x++ b 7. .by3buuosnqcq this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fro+pdbns7b xgegr88 mt :kupu:k/l;j b8h4r; b 8m 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 gravitational fpmebkbju8 b ;sg8n / 8g:rhb :4kxt;7p lud+8rorce acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionl)djz5lfr rttz dv3/zs.;l *-iess 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 height h abov-*zsd vr d)tizrz5. f/ll 3;tje the surface?

  07.06: A 500-kg car is moving atrs-hy bw/13q g4vo 7yo 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?17v-/qby 4 orys hogw3

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until iw 2c d4xs //38rddrihwt stops. If the ball travels 15 meters, what was the average nd4idr r/w3d8hs 2/c wxet force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massey3q(oa8nbzl2/biyf, 4 v zsl( 8/x klvs but identical kinetic energies and the three following statements. Which of the above statements woul /vl2zalqnzyif 348l, (bk y8obs/(xvd 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 vertem5v9;h;us-1 kjw c3ifhg, i dically 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 reachu hmw3s-,9egkc;hd vi51 ji; fes its highest point?

  06.20: A boy jumps from rest straight upqy kh85/qxv2-fy8g , 3e mlbgf.-qr xkward 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 forkhfqlq-8br . q kxg/- yv 5x3ye2gm,f8ce of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is drowtu.3qb b 50je/nzp+ ijt)w7 upped from 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 cons.j5w7wpb t i3n/ ) jbztque0u+tant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M iw/j*v-4zm,pks hzcqz56 1,s zsjg x)hs dropped from aheight H above the ground. The object bounces off of a horizontal 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 coll zh)z*hjs1gz p m-/64wqj,ss vk5xz,cision with the surface?

  96.38: A pendulum bob mass mon a cord len3pz*os73gtapi /jz 0m ro-k/fgth L is pulled sideways until the cord makes a/a/ z* ozp-j3g0prmos 7ik tf3n 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, j x 6nx,.t:f zqqy-(lj 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 (:xq-l, .jx6 t fjznqyrest. 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 10-51 ypmo/t gj:t +m8rsfmeter ramp to a loading dock, which is 1.5 meters above the sidewalk. If jmtgmr/opy1+: 8 s 5fteach carton has a mass 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=50Ni,3,q ym2ad p zt7hk9z (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 following choices best represents the work done by the force F onthe box ftk2pzq a9 ,3,yh7 izmdor the motion?

  04.48: Two identical bowlqz s*cf nw 8+j/7ktr*a(k xym(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 dropped but before ball A strikes the ground, how are the mechanical energies of the two baka+c*jm(7kwr tx z fy(*/ sqn8lls changing?

  11.28: A person throws an object of mass M straight0q *zsyvv 4vt,r.i)hn upward with an initial 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 of0) ynvi.s4r qvh *zt,v 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 that has a spring constant of 20wgud/578qy */. nmyug3 rgedr N/m. The potential energydr.nmu yw ey8 3d/q /*u5ggg7r stored in the spring is:

  97.10: A compressed spring has 16 J of potentihi0f3t, :oestab; iy , zm8gf0al energy. What is the maximum speed it can :hia,0t,i z0;efmys8o3 f g btimpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a 1cx myb8al: djrj0j9. 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 incline8rycbxjaj.:109 d l jm 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.