97.01: A force F directed at an angle of θ above the horizontal is hnego,zv6)/ v used to pull a crate a distance D across a level floor,vzego/ 6vn h). The work done by the force F is

  97.33: A softball player catches a ball of mass m, whichj sv mrr99)vc d4q62pj is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves barj) qmvj c94vs d6r92pck a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction lav/2nku63 * 4xdy v8aznmmabk/borer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. D*4y3u /mavnxmkv6k8 d/zanb2uring these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration g7rdmznc.ke (lw34a ,1xj v 2fah+d9ton a horizontal surface for 5.00 s. The block’s kinetic energy stric4aad 9wjv+3.7,tr x2 g1ncf (hmzekldtly 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 slidesv5qdby.0 u w1fxyc)l- with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thisw.)ly-xcy 5vfd10b uq 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 direcv4- h:m*e44vpvmp mdq ted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at 4m dvpv4q 4ep hm:v-m*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 exertedjjqey kr54+u. +, 7r sg 7l vr-ypgcnqbukp*(8 on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sur+ k7-nguj.* 7sqc vu ,gpyeb+48rqrl5( kpyjrface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston )we.gmd+0 gkd 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 other direction. Whi d .g0wg+m)edkch of the following correctly describes the above situation?

  03.14: A fan blows tbb2 ksf:y c3ze10vj*qhe air and gives it kinetic energy. An hour after the fan has been turned ok bv2*ezy:j3 fqc0sb 1ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has j j ..6zc:w-mm snrah0a position of 3.0 m, a speed of 4.0 -mjhw6crs:zj n. am.0 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 shelf in the bookroom 1n6) p(m0y k d:pp*tyzs / jlr8n0x8lpt.3 m from the flook08p/r x8j)6tp zpt( npn sdl:0* myylr. If the janitor 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 ujz;0j )0qvzwgct y5424,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mphu4;qzt5 jv g)cj0 w0yz), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure tor(4j qyd. jv gyix02-k 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 being pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 k0jd iy24yx(.q-gvr jkg, 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 rigta65cdul(n;- a *uner ht, 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 th ndlt5 e6a-r(u n;ac*ue 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 *mjm8f0.bg*bagm di*pn3e qcan-8u 0starting from rest, 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 n-*0b8 b u.pci*a f e83qnjda*0mm mggthe same distance F, what is its speed in terms of B?

  12.07: What is the net fqp*j+i2 thiuv*jp: z *brp,s2 orce acting on the object during the time interval of the acs*jpv+pu2 tphijz*2ib ,:*rqceleration?

  12.08: Through what distance does the o3f oivrn 0* 3i0vrps)kbject move during the time interval of th*vrn)p fo30rvk iis03e acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed -3o:bj+ z 6 :tojydfwufrom 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic eyz-ud6 ofb : :j3jot+wnergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased f21 z6ds+fni) n9ddp)9gwfbrh rom 2.00m/s to 4.00m/s. Which one of the following c92n 9 fg+whfbn1zs)d)ddpi 6rhoices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal i+7sfu v rv2tln20 an)qs used to pull a heavy suitcase of weight mga distanvv+ nl t0sau n7fq2)2rce 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 deliwzoj dvnvgb*8* ;7:t qvers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this*gv t; d*b n8wozq:7vj crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from re ob;-fx*:swcvst 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 represent*f x:v-;s obwcs 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 floor and rele ieo8 /9 2dwhyqksd+u5ased. Assuming that the collision with the floor is elasu y+/5q2d8hd s 9eiwoktic, 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 seesw wzpv*7t9/y6 y,dg*c asve4yif ux 11 a barrier ahead. If the car takes 95 dzx*1g *wy9 v /6uf,tics1e4a vyw7pymeters 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 uns 4dx 9a6kqpxileh*2 dfs;)w*iformly until it stops. If the ball tes4)6six*9 p qkdwl2*hdax f; ravels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kineti 5dg30 bjzwrb t4j:d/prh7ar;c energies and the three following statements. Which of thzb tj rb7;w3ardgp j5hr:d 0/4e 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 tossed vertically in the air wit0eu bif66iwh7kx2v e. h an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy wheve2 h7 xf60w.iki6ube n it reaches its highest point?

  06.20: A boy jumps from rest straight upwa 2 0m hmewf-q0980tvl qmrzop1rd 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. m0m28-9ev qm1fplrq0 hw0ozt 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 above t3yv am5 i/tj8y xhou 2cc-;w9lhe 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 t3-y5 y9v i/c2mhjxo8w c aul;on the object while coming to rest?

  12.48: An object of mass M is dr)+y 8d;0nad f1zrkh hjopped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The ob; ad +hjfyrn1)kd80zhject 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 leg-ge 8 sp-9kbrngth L is pulled sideways until the cord maes kr9 g8b-pg-kes 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 y45a/p 4m r858 kn.ppvx2*zgrtneptba uniform incline of unknown angle. The sled, which started at the bom4*8pn.k 5t4p/gx 8r5avptzryp b2 nettom 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 original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons fn w0(6h6vpbi3r0gsz from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each cp36iz ws bnfhv006( grarton 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 forcek md. 5au(p jm2iz:ow 1i8rr2d 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 following choices best represenk(25m u:ajmdi8p.wzo d1rr2 its the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and Bg) jiv;sk 2rn* 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 2)jinr;gvs*k, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initidvgr2m c :4)3a:de puial non-zero speed v. The object rises to a maximum height H a2r4va::mgde pu c 3di)bove 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? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has 8v4( h8fz2vwvgglzunq,,h3; yhyx 3 g a spring constant of 20 N/m. The potential ene g;(8hw,2xv 3guq, 8y4lvh gyzh3zfnvrgy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. 1gmqd:8z fk-tj + pv)pik*c.z9n3yyd What is the maximum speed it can impart t9yd3fzm *d : gpqp. -1tnc)vyjk+k8izo a 2.0-kg object ?

  

  10.31: An object of maebdy+ j :(-nfm+8 eusmss M starts 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 jm8u:bydn m(-fe+es+ object for both trials.