97.01: A force F directed at an angle of θ above the h-oz;i:yv b(ahbjce+3arxj :hk )w2( horizontal is used to pull a crate a distance D acre;)(xh az-( ha:jhj+wkvb ocyir:32boss a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which il.+cqo; 3hozis moving toward her with horizontal speeiqc. 3ozol +h;d v. While bringing 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 ki5(ieea(gta7t;+ lky qlogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much powerk5ea e lqt(y ;ag7it+( was expended on the wallboard?

  17.11: A 5.00 kg block slides with uek141g-psw tn niform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5twg -1s4n k1pe0.0 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 withvlz;m8mg ko. 6 uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energg.vzk;lom m86y 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 kg bloco4m v l)o2 c:ta udyleq6.s: iai:*py;k for 5.0 s. The block was initially *l4 aqc6: dy2o.)ail :mp yu;vs:toeiat 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 is exerted on a 3.0 kg blocusd-t- b 3hx7xk for 5.0 s. The block wbhxus-xtd -3 7as 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 frictionlvcd9o p5s ;jco0fhz tciyh7: 216cz0yess frozen pond throws a 1 kg hammer in one direction. After the hpht5c1z6c9 v:y so0ycio0;7 2zcfdjthrow, 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 after t dv:p6;ndbt* zhe fan has been turned offvn;b*pddz:6 t ,
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 oftu8 h7w-w1pes,1hd oz 3.0 m, a speed of 4.0 m/s, and an az78, wh spe1d1w-thuocceleration 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 bookroom 1 czbf)6(evp.n.3 m from the floor. If the janitor relocate(vbc.z nf) p6es 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 ,.zjyj4-dtb g/3c-gtwu eiu5 watts (about 32 horsepower) of power to a car's driving wheels. wz,tcg/b-y u4ge td35iu.-j j If the car maintains 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 the right, a box moves with speed 5.00 m/s 8w3w ku 2(tt gaz,osw*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 o owk (,gs8t3*uw2azwt f 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 theeq14wqkmzq)c( sz o6(/ -b,eeukdc x+ 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 mass m= 20.0 kg, has a speed of 2.50 m/swhen itsoe, ze dq/eck6uk) (w4x(mqb c +-qz1 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 wn6zwt s:(d, srest, along a straight road. CarA 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 termsw tszn:,ds6 w( of B?

  12.07: What is the net force actingpot a5;5. ef,i s1oyrxu2qe 5e on the object during the time interval of the accel5o5;i eo5e1aetqfs, yp u r2.xeration?

  12.08: Through what distance does the object move during the time interval of a 6g dt1*yynv 5f6f-58e*s ttju ,fcnathe acsft5c,f*-*t dgjv 81yft6nny5a 6 ueaceleration

  12.19: The magnitude of the linear mom19*q.vz4qnm bsi a,s8sz q9dhn,vqc 7 entum 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. cds,qa4 n q,nqhzvv*1s979qbi zm s.8What 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 whiu ft;tn 1 ,8c 8zgz,wedn)o6 -.nqzwlyle its speed is increased from 2.00m/s to 4.00m/s. Which one ezwf n wynt,- untg.cd188 z;)zq6ol ,of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above /3u;a1x9l x01ca vl gdp0vogpvef-o* the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor 1vauxplxa10 vo/03pgde ;gvo*c f 9-land the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outlfa x :;ziq 4gy6/ fi8)jhn/hpsrq5 w-put of 0.10 w to raise a block vertically at a constant speed. At what constangh; rijqsfxalw)nq5y:f /pz h/6 -4 i8t speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, zf1ytn:f5k mt37 d4v4t, ; pmyjph7xx 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 by the 1.00 kg object during 5p4mf:pk7 vf,d41 xyjyx;7mtzt nt3hthe fall?

  96.18: A rubber ball is held moti qcndt :6a- sing:ub;8onless a height ho above a hard floor and released. Assuming that thedsaq:tc8:gb ;u-6ni n 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrieadjz7sw;8p f( rzhx6d47g6utsd:qq /r ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average dt6s/px6dg qjfz:w78zq; h 4r( au7sd net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it-dy jj + ykd2eyb :f6/g uo6mchp8o51a stops. If the ball travels 15 meters, what was -dme + o8jc6d6fp/2j:1b uo5h ykay gythe average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kineticfdgle2u ptc:d;r9:t) energies and the three following statements. Which of the a;fr9c td:)p:g eltdu2bove 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 tossed vertically in the air with an i- xea( bj03i9ked 7gzg8e n1iunitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentiadne zie3g1 7-j8uxik e(0 a9gbl energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concresv crwg16eqb,q8z -k3te surface. The boy, of mass -6 wqrg8q,b3 ekcv1sz 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 boy?

  02.48: An object of mbw:f bquou6k6c zn/8(avj2 p:ass M is dropped 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 constant force exerted by the ground on the obje2( p: nk6uju /: faboc68zqwvbct while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground.762ir 5,yig)an b rlzv The object bounces off of a horizontal surface i75 rz)vi ,birny2gla 6n 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 length L is pulled sideways un j .rwf sk 64gdjxq/zeg;x4 aif1l3syml9(95ytil the cord mak(s6k3 y9x j 5 fqj4y;/ex.la 9if1sg4mdgwzrl es 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 uniformxjh3+fe53ba z 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 back down the hill. What is the sled's speed wh33z5b+ fajex hen 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 ram3:i o,fveapn g17,aymp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, f: vynpoamia 7g, ,e13what 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 figure) is applirgzj*0x 58t8 h3 nmfdeed 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 gxz mfe5d8 8ht*j3nr0work done by the force F onthe box for the motion?

  04.48: Two identical bowling ballsh 9qfokkxn 554 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 tko 5q4n9xk 5hfwo balls changing?

  11.28: A person throws an object of mass M straight upwaro;n:ttz(75e l-aocngt i*m dl0m g3i1 d 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 of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignndlzmoc(3i1alg*i;0- 7g t mnt :e5otore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constaq,: wdtna:kup*b55+jcb6t s b 2yqg4pwupo4 7nt of 20 N/m. The potential energy stored inkb4w pj: ny5u btbpa7pct:g6qs24d u w*+q,5o the spring is:

  97.10: A compressed spring has 16 J of potential energy :p zwer 8)kvpc5tlsral ;* u8t7t1-fl. What is the maximum speed it can impart to a 2.0-kg obuvrctk ts88r5a -w f) ;*7ltl p1zpe:lject ?

  

  10.31: An object of mass M starts from rest at the bottoos8m;, x5 kzucu8 ozr2m 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 obu o,zx;sk88om 2c5urzject for both trials.