97.01: A force F directed at an angle of skl 0*r84j:s-q ppbey θ above the horizontal is used to pull 0lrppksb4 : 8j-s* qyea 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 moving toward her wierix)zqw v0-vo /2q0 .q:ofxz/m soa:th horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by h/rxoeq0m -2zoaq0.zw)iqs xv o :vf/: er hand is

  99.14: A construction laborer holds tm 71(ze r.pata 20 kilogram sheet of wallboard 3 meter above the floor for (.1tat pzerm7 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with unifor42w:p9pvy sf um acceleration on a horizontal surface for 5.:v9s yw4uf2pp 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 acceleratiof 95h1fw y;kjpn on a horizontal surface fyw5 j19pkf; fhor 5.00 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 directed to 1rh;uue+zpe:- -)d pnm1qfw x6ck)uz the right is exerted on a 3.0 kg block for 5.0 s. The block was initiae r cdpex-f)hu q nz;1 -w1ukz)+mup:6lly 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 disd; 3 r uw-z h5eb4zmj -,ywbevi0,mh3rected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonue i ys4zwr- m,ehb;- 3jb3d,vwmh0z5tal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fric*;/xqfyymi di 0f h82,f3ggbctionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student movb ;,hc2 dfmiyi*8f0 gxyg3qf/es off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows th3h+ttmpg9l2nt 0t + hse air and gives it kinetic energy. An hour after the fan has been m2nls9gttpth 3++ t0h turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a . cjr ngb/*ed; l0tcm ew/-lh.block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and d/wce g blmr/ *-.ejlt;chn 0.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 1.3 m -da-qjd;ab. c from the flooc;-- ad. dabqjr. 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 24,000 watts (about 32 horsepower) of power-xx0b o :lc3we to a car's driving wheels. If the car maib ol:0c3x-ex wntains 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 at th9 c4nu 8l-1ms*covpd rpu;b,he 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 of 2.50 m/swhenc4rn-h*ocl;pbud 9v sp,m81 u 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 b)ow aj)5i: v ;tbkfl9,,b xyzqottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of jy ;kxf :l)vtiz,aqb,59b w)othe 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 rest, along a st4a,m8*5nv ,h zkml iewraight road. CarA has twice the a,, man4 58 izw*hkvelmcceleration 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 force acting on the0vcgr.b fi+ xcfm )*43bp znex7: r6nrsnyr 33 object during the time interval of the acceleration.ns3) r6nmbf33x * e+brc nvf:iy xp 40cz7grr?

  12.08: Through what dista+svwfr1m+lf.d /u r +znce does the object move during the time interval of the w r+f r/1ds+.zlmvf +uacceleration

  12.19: The magnitude of the linear momentum of a 4. 8j( q8absxa2c5 f tir/y;de9wg gc,k.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 is the change in the kinetic energy of the mass du/d jaf85yrcw98 (cgisg ta ek2 qb;,x.ring this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while itsiby8r-0gu gp k(skt1vk/r t/: speed is increased from k8r vbr/kt/g0uig(t-pky :s12.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hor6r9miwy y/gljw )2pz3izontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of fricti yl3 /w2z69pgjry mwi)on 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 output ojji mjhewgfn 8 s*u-2c -6(cp))g6az sf6inwgsm(he pz*2- ) j8j6cf ua jg-c)s 0.10 w to raise a block vertically at a constant 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 thekhdk5e z/s+it3 l- *yf Earth, the gravitational forcey-/id3ks *lk e+z5thf 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 mf *;bt nn0.a uyzo2pdiz7jc,8otionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relatizp*nz c,7;o bnyd a8.fj2iu0t onship 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 ac*q1,j wieq bipg6+3h barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stoph3+ q,gc i6 bjei1pw*q?

  00.26: A 500-gram ball moving at 15 m/s slows down unifor/o6 fsoi9lo,9ma *ivh mly until it stops. If the ball travels 15 meter *6hmv9ofo o s9li/i,as, 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 k1lqj 013 gdx5 )injx19q lowkeinetic energies and the three following statements. Which of the above statements w05eoq1 1nd ) jlwix9xql g13kjould 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 ajqt1 wuk1 voz;i0u6ove,7 jl.n initial speed of 4.60 m/s. Ignoring air .u6ulw0v1 k,jozeovq tj7; 1iresistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straighke)gfkwnjj; * lz7e +)t upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and hkejgjekf ))7n ;zw l*+is 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 aheightH above the ground. Theq54od. ynt;s ot f*)mn object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that aid 5f4 s; *yo.qttomnn)r 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 gro+ *aw1hif x8 82haoibqund. The object bounces off of a horizontal surface in a collision lasting time T. iio*a wf8qah8hx+ b21 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 the6m l q)k9jh oqe.j7g3g cord makes ).mgj7oh 6ql3j9gqekan 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 vq*yw95 msr0 e 4hx:vaa uniform 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 vahrqxw:y 40v59se m *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 e6+r f qy36hbxmoves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which isr eb36fxh 6+yq 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 the figure) is applied for twtr v q1)cubq4m dl3..he 6.0 met .wd34mbquq1crv. )lt er 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 work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped f3x:s4fq6 kl+l saw+pabf3b:trom rest from the top of a tall tower. Ball A is dropped+ ::k+wlb 4bta q axfspf3sl36 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 an initial h6 vmpfb6x m+zmk25snfh:38bj k5v um79e,vbnon-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 f v5m,6 2v3vb5 fbuz7xhm:pk8mhjmb + kne69swhat 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 sprin/h c q v)+:tz(mgf :cd)idu1l7goh6fsg that has a spring constant of 20 N/m. The potential energy stored in the spring isfc/ 1ds7g):cqgh+hfoid 6zt lv mu:( ):

  97.10: A compressed spring has 16 J of potential energ( aymo q9d3bf ac89t.hy. What is the maximum speed it can imya99fq.b 3(tdocm 8hapart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at vyk8 ; t*bdkrdg efrup3w40nc* a4*c)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 doa0dk 3vcdbrcg4w*f *ny )8*t; k4 preune 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.