97.01: A force F directed at an angle of θ above thm m 0yh0-wsn ikdk;e):e horizontal is used to pull a crate:n m ;kiemk0w )dy0-hs a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass0vjgs x;hx8ri, gcwaf98 m m8,nn2.jl m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Ass8vl c,s a8,mx jijm.;nr9 2 n8whf0xgguming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallnr3vg2r1nc28k6suvy a4 uf ) kboard 3 meter above the floor for 4 seconds. During these 4 secondshow much p)gvs 483r 2ay2 nkfvrukn u6c1ower was expended on the wallboard?

  17.11: A 5.00 kg block slides w9 zyw d 9.jcf9jb2d al-gk*q*kith uniform acceleration on a horizontal surfwb9d qk* .jka-lfgd*2 yc9 9zjace for 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 uw:fy/v yab / .5mt 3bctl hwm4m;:*kf with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasbuwbk haf 4cm3t/5;my*.vtyw :l: m /fes 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.oowe f3 +o xc+f;g1mj+0 kg block for 5.0 s. The bm+fgco3f x+1joe w+ o;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 to the right is exerted on a 3.x sjz +5(-vw+y9or5 vw lgqx,y0 kg block for 5.0 s. The block was initially at rest and s( v5zjo-+sy wrx+x ,wlyvq59glides 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 fr rwas px fxf3bges(l5-:4n3p :ictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one dirf(p 3s:x:ep5l fn3br4 sa-xgwection 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 an/dqv h o,.vb.vd gives it kinetic energy. An hour after the fan has been turd,h .vvbv o./qned 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 of 3.0 m, a st i9jh7)-i r,0s ihqdspeed of 4.0 m/s, and an,0d9hi ri-s 7)hjqs ti acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbook(zm)y+hmm0l mf(a u ne9)ob(ys is on the middle shelf 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 )m9 ly b znh(eo)myf+a0mum( (do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watfj(hki ) r;vyg fx9i46ts (about 32 horsepower) of power to ri 9)v (6igkfhf4 yjx;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 acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.009k /csw4c 3gldwk*kxv2v f+d5 m/s at the bottom of a rough/c5wklk+2*sf3gv9dx 4 vwckd , 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 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 db /n- y ;rwiezg*lc+)1u3fforight, 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 o+f)rfweui*b-1 z/cdl g; ny3of 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 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 restjo9gz14eluu 4, 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 distanc94 el zgu1o4jue F, what is its speed in terms of B?

  12.07: What is the net force acl8wdcbqzb (4h- l b t;ls ,l991flwp/dting on the object during the time interval of thehlp fz491s ll 9b- btlw8qlc,( ;d/dbw acceleration?

  12.08: Through what distance does the off surubkg8ey (7,7 0rbject move during the time interval of th g8fuuk 7,sr7e( 0rbfye acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kghofq*0( xdt 6v:rssf) ;ho2 ke 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 kinetic energy of the mass durindrh s) :t(06 hs2 ;xevfok*foqg this time interval?

  14.11: A crate gains 36* b. clfgui)2x.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass ofuli)x f b*c2g. the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heyixte6n :s +fz54ap i,avy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of t6n yzesi:ix +pa, 45ffriction 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 useful power oub;lkbta y qr.lg 2l+2i3,w9qty*ou6stput of 0.10 w to raise a bl,6t.sulabb9+rwg2k l *q;qy iy 23tolock vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objjk3+m iakh --bect is released from rest 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 objecjm+ --kbhk3i at 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 hard floxfjgonag9+a89r 4 ;vuuav5t /or 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 9 r8/ 9av 4ufn+;ggu5tvaojxaits height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s.ohi i42vf9yg naig /(/ The driver sees a barrier ahead. If the car takes 95 meters to come t/ gi4 2oyn(v/f 9giihao rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving)eht axr6:usw/4sgxr h .0bj: at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, r.:0 tj b:/xsw4e)u6hagxrsh 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 kinetic 9b/x4kbcp5( cx wq-rg energies and the three following statements. xcxb/ -wbg4r5pc9kq( Which of the 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 with an initiav w r(m69arm*ql speed of 4.60 m/s. Ignoring air resistance, whaam 6rrv*qm9(w t is 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 co b .5zdeq-cw2sncrete 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 pbe cd5wzq s2-.oint 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;iux-zlk)v t9 M is dropped from aheightH above the ground. The object crashes into some soft earth and9xvtkli )-z u; 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 dyxxpvtvftsi +vtk:05y.+7 :the ground. The object bounces off of a horizontal surface in a collision lastinif+:vytx. 7dpy 0xvt stvk5:+g 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 until the cos)r)wg. e/h5kve4, ziw3 tg gteo33zurd makewi)gso3),5vzh wrz /t4ke3t e ue3g.gs 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 rf 6fmbauip /* gnee4 g(p3q82sled, 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 hir/g83u2 p4ei qe f(pnb*a6fgmll. 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 sidewa di gn7:nk1yo2lk, along a 10-meter ramp to a load:dy2 oni1nkg 7ing 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 on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in.vl3kj 0z i9yb 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 bestijv3b l.9zy0 k 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 thewj vmw/ qm68by; py186txq+/idkc4dw 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 1/kvw /b+ymqw8dytd6xj ;iwpm8c6 4 qare the mechanical energies of the two balls changing?

  11.28: A person throws an objemk0i v3p5rn(y bj (0blct of 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 of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0ilv3n5 b(bpmr(kyj 00 .5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant o rg)5p78/wtpe0ip ufwh( 9chuf 20 N/m. The potential energy stored igw p95c7ir0(/h)uh ptf wepu8n the spring is:

  97.10: A compressed spq,y+7c8fd9nl a5z9 2cmthphnring has 16 J of potential energy. What is the maximum speed it can impart ,92h9lz7d c+ 8t acf5qnnmp hyto a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottoy--d3 a66warcaa. lbn 4f 2fvqm 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 nv far-4- 6fl6bw.d3ca a y2qashown 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.