97.01: A force F directed at an aeb.91hf aqkz+ ngle of θ above the horizontal is used to pulqf+1h .9kazbe l a crate a distance 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 movingf jgmd fg- oak2 aznpw8f4s.8:2;ivm3 toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, k f;v na zf42 gag:8w8i-djfp m23som.the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet)ixe+fz x w00h of wallboard 3 meter above the floor for 4 seconds. +xe)zh0fwx0i During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizont zbs+wl,i /j+k.zu8tral surface for 5.0+rtlk. zuz8 +/,sijb w0 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 acc,hxbp( rc9sc -xu,s +leleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasx -xcshu c,p(r9 l,sb+es 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 ex-tqu ic m:zv*-fn :2lterted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horictv -u2mi:- t*zlfq n:zontal 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 o 7bxfp-b mt))in a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horiz7pmi) )-tbxfb ontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless6 bs n zpb/iw.88zvvt18( muwu frozen pond throws a 1 kg hammer in one direction. After the usi8z8.1 t8vvbbn z w6pu(mw/ 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 the air and gives it kineticz i/1*yzt3lr bs0y-xsjx+:m) h hnug4 energy. An hour after the fan has been tu4 g/my1n * i x3rtu+z:-bhshszyjx0 l)rned 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 okt5y 9sl/er:ab42 zw:p:yobx f 3.0 m, a speed of 4.0 m/s, and an acce a9ky2b e:w/5p4os trlbzx::y leration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb qo-5mjp k;fk26 wac6wooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelfcmq; -2jfp5k w6o6kaw 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 4if 3*tm mva.imwp g39etdv5 +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 3 +i4*39dtmtm5gwvea mipvf .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 sz* :jrl72c j;-kbhtfw8jx4 q; nd)iu xpeed 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 d2c;it)lkn fhjzr;7b-uxq 4* x:w8j jas 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, aezet14;f a-az 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 of F zae-z4 1taf; e= 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 startipe9mb9j d7br ;q (7jskng from rest, along a straight road. CarA has twice the acceleratidpbm; 7j(qj9rskb e9 7on 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 terms of B?

  12.07: What is the net fo4o2 -m:sh xdtzztc0b(rce acting on the object during the time interval of the z (zhmo btc- xs02d4t:acceleration?

  12.08: Through what distance does the object move during the o3gmso 9b1le3time interval of the accel39 oes 13mlbogeration

  12.19: The magnitude offcw;8w*y w8xc x26w(klp8q wh the linear 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 i wfw8(xwwkhl ;q8pw8cyx *c 62s 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 sp y,,0x(e 08o8wrifjm/j3g enmz:yo zleed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of t0igrzmyynlj zw ej8,x,f 80:(o3m oe/he crate

  94.38: A force F at an angle θ aboebqgrg ;w5 fyuo4el/k8 w(7ql1 8 h20yfsdgs4 ve the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor atde 7y(huq8f5 gs4w84 ofe2 b1gql0y/r l gkws; 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 delivers a u -:b;svdgs lgx,e653v4o5 tny ck 4nioseful power output of 0.10 w to raise a block vertically at a constano:- y,5 ngbci;6on4s5g4t d3seklv xv t speed. At what constant 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 th-2kt ie14 myqpk 2n(wae 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 force actkkq1 ea -wi2m 2y4tn(ping 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 andtsiso72z(6 /jfn6 dbp released. Assuming that the collision with the floor is elastic, which one of the following graphs best sh s6 poszt67nd/bi j(2fows 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 a3ytv /i lx(w (i2h0bhot 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitudeh2(o h /xyi0(3itvw bl of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows do-0)fc*t4/bp ufrxh mci tc9, ,cjp2cpwn uniformly until it stops. If the ball travels 15 meters, what was the av c4c*/,ft p hcpjb im09uc-rtxf ,)p2cerage net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identid j3j,da)xu 5wcal kinetic energies and the three following statements. Which of the above statements ww 3j,5jdduax)ould 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 initial w/ hk:wywe4)kq q(jb 44xtlc7speed of 4.60 m/s. Ignoring air resistance, what ibw:xt4ye(k/lc )4wqhw k7qj4 s the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concret/9i*id1n 0zudtsmx9jr j 7d/fe surface. The boy, of mass M, le//jd tx 7djmu f19si*dz in9r0aves 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 mass M is dropped from aheip14b8 oechj-)p8besgpw -l m g*p;p.vghtH above the ground. The object crashes into some soft earth and comes to rest by compres;lpe 1mswehj -)pgco * p ppbb-84.g8vsing 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 abovem)p ,qf2k fh8 i.g7hce the ground. The object 2 gh) km.,8icfqefp 7hbounces 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 surface?

  96.38: A pendulum bob mass /b/t fnve f,6i .c;xetmon a cord length L is pulled sideways until the cord makese;/,.6fx/n ve fct bit 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 uniform incline of unknown angle. The sled, which c s,blvulo7ymk jm256p45dm 6started 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 when it returns to its 6y,6bv57pd ols5klmm2 jum4c original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk,g un4ho52s 4zl along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on2z ns44guhol5 the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown injb nf4kr-13,v)v (mwyqdg z2e 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 omy2 (r4bfg-q ),k 13wvjvnzedne 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 fky-s7v i /c gn1x1fvb(rom rest from the top ofsgy (xfck17n b/v1 v-i 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 balls changing?

  11.28: A person throws an object of mass M straight upward with a)sfu d2g/g)kfn initial non-zero speed v. The object rises us/g2dfg )) fkto 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? Ignore air resistance.

  96.20: A force of 10 N stretches /na46ezt6a5y)w;wy dccg5dqw0by +jh :uy8oa spring that has a spring constant of 20 N/m. The potential energy stored in the td5+ 64 580yy;cohwwu:)ajc d e6/anzybqywgspring is:

  97.10: A compressed spring has 16 J of pote: wc2qvshg5 n3ntial energy. What is the maximum speed hw gc3sqnv52: it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline -d2m e81nq qj:jv-9m jkwhy)zof height H. A person decides to push the object up the incline in onj1qde 8mnqyjz) h-2: jk9-vmwe 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.