97.01: A force F directed at an angle of θ above the horizontal is gl f:cy( ,b5xta3j0ywused to pull a craa:fy3 btc 5lw,xyj0( gte a distance D across a level floor. The work done by the force F is

  97.33: A softball play cl;vcz4+anu(tg v2rc;l 4a.der catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball tc gv lcd+za42 t;arncvl .u4(;o 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 20s/yry-sk hxu5) 5g+yg kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 se-+ugs5skr)y h yx5/gycondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerat 93q+jny bfcz a(:mdc*,wlv 4qion on a horizontal surface fo9(+d,vl jfymqb3*qn:a 4c czw r 5.00 s. 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 slides with uniform acceleration on a horizong*h8a *i,vfbdtal surface for 5.00 s. The b,*ig* v bd8fahlock’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 km5.be v3;g mris exerted on a 3.0 kg block for 5.0 s. The block was initially atr vkm.b35g ;em 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 the right-lj5 i)a igl 75:yluh5rbk8fo is exerted on a 3.0 kg block for 5.0 s. rl5u)-y 5 la:fg8boih 75l jkiThe 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 rt iec aw;wg.ua */-)ijeston 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 the otigtw)c *e-/ u.ia; jwaher direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the fan )w *gm9l8 xllq2dx1pfck s24y has been turne)xlwld s 8cpg124mlq*kf y29x d off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kol2l oo/t1g;h g has a position of 3.0 m, a speed of 4.0;gho t2ol o1l/ m/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 textbooks is on the middle s6gsd+mt:4ynv helf in the bookroom 1.3 m from the floor. If the janitor relocates dsg6 +vt4n:mythe 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 32zum13x(yz5 mx 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 x35 xyz1mu mz(the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/p9o 2ad).* 6 lc wl d,phk2i9dickfgo*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 massf9wp*ih9g.okpdc,dc l)d o*22li6 a k 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 qd9u;egot5)5m lc(g v to the 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 becl (5qmuov)d9 t5g;e ging 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 the right, each starting from rest, along a straighl-p)v s+n9 i*d5p4sux )wn6ck n wnu8zt road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has tps8xcnw+ z5d 9up-nun)s kv)i*w46l nraveled 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 intervaldi :d0 tm/w(s7ube5 ey of the acceleraemsyu(dd :t5ibe w07/tion?

  12.08: Through what did.k1o3l24zdwrx 8ymm,n n+ bgstance does the object move during the time interval of the accer,gdkoz lm1b3+ mdnn2 8w x.4yleration

  12.19: The magnitude of the lazd kwb otmtc8-ij9 9nte.7(; inear momentum of a 4.00 kg point mass is 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 kineticd.nzj-tetm i8k 7 9t;a9cbw (o energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed exs qm cuc8;9qz1 yp);0cr3ht is increased from 2.00m/s to 4.00m/s. Which one of the following choices bex;8 zermqp9s3tq c)cyh;cu 0 1st represents the mass of the crate

  94.38: A force F at an an6ys m1e+stz( ygle θ above the horizontal is used to pull a heavy suitcase of weight mga distan z yms+6syt1e(ce d along 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 upward force and d8* lb3cb*enct 8v/wpxbg +pdh( gq 2r7elivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cr7*g+nq t8hpx p83v*/bc(2 gwlb erdcbane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the su+svgkw6v-nfx(aq0 a ( rface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 1wv-a(f+s( aqx 6k0nvg 0.0 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 by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a rh2i gi -y(o;ydy wo8;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 above the hy wod-ri ;g2;iy8o( ysurface?

  07.06: A 500-kg car is moving at 28 m/s. The drive4, lgit+fnc p;r sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necestnplg ;i+ 4fc,sary to stop?

  00.26: A 500-gram ball mw9ze(;zz f ge6oving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what wgzz; e69zfw e(as the average net force applied while it was coming to a stop?

  02.26: Consider two labora( 3p;v(l ( /jmlwptdjptory carts of different masses but identical kinetic energies and the three following statements. Which of the above statemen(jpvt plm(dl/ w(j;3 pts 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 to9bfxfga+.h ),ffqc* /vscri,ssed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its ,/br,ca.gfv+f 9fi* hxscq)fpotential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flvccfan,zmn a(gt(eng*9: -uohy58 ( sat, stationary concrete surface. The boy, of mass M, leaves the concrete (n ng*f 9t- g,a((a :nzsh85cye omvucsurface 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 droppen8g jx3y413 sb l.kxyhw6 1bjud from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing j.xbw1ujhng 8lxy y36 4b3k1s 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 rest?

  12.48: An object of mass M is dropped from aheight H above th9 oyxp9 2pm34bnv l5hre ground. The object bounces off of a horizontal surface 3 5yhmpvl2o4x 9pn br9in 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 mon a cord b5(n8 xu 6yjh3r i:vvplength L is pulled sideways until the cord makiuvbjyx 65r3hp:8( vnes 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 uniformf9 ze(.zlp 8oi incline of unknown 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 backzz o9l ep(i.8f 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 aoh q 3ezk(l y):*ra2nk 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton hasqry: (*nlh)2kkzaeo3 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=50N (as shown in the figuo1(n 4gj2uzafsws y34 re) 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 ontu2z1 s4w sfn(jg4 o3yahe box for the motion?

  04.48: Two identical bowling balls A and B are each dr9( frbn;-vnno opped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is droppen(-v;9nrof nb d 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 stra 9.6wcfc:uiy 3e3r c l,z(fbbvight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The persozbw3bc, fc :iu6e (.9cl3vry fn 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of24 h:(5x6aj+s xreol oj*uyy x 20 N/m. The potens*ojrxlh2: y 4xa(e+ xuo56jytial energy stored in the spring is:

  97.10: A compressed spriyq - z;/g8w6mfgou .king has 16 J of potential energy. What is the maximum speed itg6 g/fou- .w8kmi zq;y can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incl;c3z ukk 4hw3/dit k6wine of height H. A person decides to push the object up w u63zdkt /;ik hc4kw3the 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 trials.