97.01: A force F directed at an )k2bc6 e)f,xj cb3dfypq; x-uangle of θ above the horizontal is used to pull a crate a f u6xy-ke2cx;)bc) jq ,pb3dfdistance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving t+slpvd*f0 dzq e+qi j*6pa(6k oward her with horizontal speed v. While bringing the ball to rest, her hand *d+p f+iz6l0 qjpq(6*s kadve 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 ,9 sblomfz0 t,wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex9 ,,bsm zf0tlopended on the wallboard?

  17.11: A 5.00 kg blo azqdel36r7s3rz-cr-ck slides with uniform acceleration on a horizontal surface for 5zre-6q l7 zdr33cs-ra .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 )vdarr7c qv3bn4 s6e(a horizontal surface for 5.dc4 r3 bv6qa7)rv e(sn00 s. 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 dire )2n(zz cu j6rcv(lwe 73x)ciected to the right is exerted on a 3.0 kg block for 5.0 s. The binwc32e jlx()v7z)z ce6ru c(lock was initially at 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 8cg6xmbx .wfukfm y2e28q;qanf3 k35 to the right is exerted on a 3.0 kg block for 5.0 s. Theem3un ya 3km2;qw k gb28ffx6cf5.8xq 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 throws cy 0cj 8bq+2(dhnz8+aes5y 5n3wpzkha 1 kg hammer in one directiona 5hyk n8c8+dh2(cp05 q+3syjzne bzw. After the throw, 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 ther+r9 b n*wear/ air and gives it kinetic energy. An hour after the fan har+ew *r9/ar nbs been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant,ddac75 hm(5vh. h -gfx a block of mass 0.50 kg has a position of 3.0 m, a speed o hc gxd5.-57hmafvd(h f 4.0 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 shk8n88 q+:im li , yjs7ux9iyy sjkr))z 2gty:pelf 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 the box. The boxj: +i)u : jly28n irz8gy,xs7yq 9 mipktyks8) has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 h6r49 hv z 0tuwbmp:b7horsepower) 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 the retarding force act:h067vz uwr p tbbh94ming on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 4rpz3u- :ov:n3qt + jihf*yd nm/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the inclinei3- 4hzju+p t *nv:n:yro3qdf 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 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 the;rot 9eku6lo ) 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.)t6;olo9 ruke 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 6gzd t.6el0 gcrest, 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 termsg6l.d e t0z6gc of B?

  12.07: What is the net force acting on the object during the time in:ivj7f cj b0s9 aalmo3ys6. wgg*p0t(terval of the acceleratc7(ijyss0a g3ajl9t:owmp 0 v fg. b6*ion?

  12.08: Through what distance does the object move during the time interval ofllfrbu. *(/ xc the accel xl*.fu( /lcrberation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is ch6q7 ptvx.-h8 t-eevh i,ith ( dqy-v9oanged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change i 6,vdvt -qiht(. iyet9pe -h-o7h8v qxn the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is ic/,2 b4cdt9nojj3gwk f:pp 0bncreased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mas0pfgnkj dt/p,co 2j9b :43 bwcs of the crate

  94.38: A force F at an angle θ above the horizontal is(8yv(be sgq.18k p lde used to pull a heavy suiebq8(18d y(p g .klvestcase of weight mga distance 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(ci db(a 1hyp77 jqpz2 and delivers a useful power output of 0.10 w to raise a block vertically at p 7(z17hc dibja(y2pqa constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released f(e) nohlg w62wrom rest near the surface of the Earth, the gravitational forcew62e () hlngwo 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 the fall?

  96.18: A rubber ball is held motionless l2l *vgt:ho4it.n7yqq1 uve . a height ho above a hard floor and released. Assuming that the c*euv tyotvl41nqg 2h: l7.qi.ollision 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 2savr 42p(quub+w9jo28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of uvq r2awu2po94+j(bs the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/r5jlgqm;d/hp 8o;t ( qs slows down uniformly until it stops. If the bo(5rqq;glp;m 8/hdt jall travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different+t np15qkpllhi2/m jn7hl 42g5 eaf 2h masses but identical kinetic energies and the three following statements. Which of the above statements would be c 2+5pmlhn ih hfq4 5j2p/k12 ge7tnllaorrect?
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 a9/bqy81ryx -wa 5ch;-puu biin the air with an initial spebbu 8 yiuh p1-x;a5crq-y/9awed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwarn z/x7 a :,j/azjma2aid 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 aija/ ,znxma 7ajz/:2 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 *l,da gfc ysbe ;gh*3(the ground. The object crashes into some soft earth ane hgs,; g3*fayc (l*bdd 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 object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. Thekgtv9e5gr,ai7, .kcx 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 collision with the surfg .9 x,5i gc7aketvr,kace?

  96.38: A pendulum bob mass mon a cord length L is pulled sirm8e : wgfb jc+7(ij;ldeways until the cord makes anb(gfe:jc;rj m7li+8 w 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, which+spqo21ne 1vn started at the bottom ofsop21+n 1qv ne 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 mx pzs:u ri;aclx-*m0p4) ;brom the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters abol4-aup: b;nc*m ; )0sr zixmpxve the sidewalk. If each 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=50N (as shown in the figure) is applied for the;qdueb4 mk/.y8-i ybm 6.0 meter motion of the box upward along the incline. The mas eq-di m8 4.uyk;mbby/s of the block is M=15 kg. Which one of the following 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 dropped from rest from the 4q 0a7otij9i 8agf*vb vz+s i(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 tiqjg*bsz oi+70v ( aatvi498fhe two balls changing?

  11.28: A person throws an object of 0fx*(svg2bl r mass M straight 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 ofbfx*l v(20s rg 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 of ay-irg iycw+xszmf2pl6 */)q. 2 j( r*)tpkeu20 N/m. The potential energy stored in the spring ic kz (*qypf*r js-.ip e r) /6)2g2atxluwiy+ms:

  97.10: A compressed spring has 16 J of potential enezro 2:9hja f2ln8ao8c rgy. What is the maximum speed it can impart to a 2.0-kg objlofj8n 2ahroca 9z:28 ect ?

  

  10.31: An object of mass M stare. 1wt9)zwc ckts 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 izwt9)k.e cw1 cn 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.