97.01: A force F dire5wtir56zy r3fd:tz 0ected at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F isd ztr53y: e fzr06itw5

  97.33: A softball player catches a *uwm*vg19n*jx; rzsst z7ns:ball of mass m, which is moving toward her with 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 1gx:s*v9n;rs7 j*smw*ut z nz her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter d8(ia wfw- :7 mnroip)above the floor for 4 seconr-8i7:nm pwo(d if w)ads. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerati1sk ghjw5y6r.,o kl-x on on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 Jgwy1j,k5r-.ox s6 klh 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 wiprr,3xai+ b-rth uniform acceleration on a horizontal surface for 5.00 s. The block’s kinp+,br r-a i3xretic 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 forcemb7(t y taf(-ganse8h2x1.tpb i*b *r directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slidesb*ibrsgf* b-t1(.nt m p( h7 e8xta2ya 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 3.0 kg block forxf5m ay pcxpq* bb-.-2 5.0 s. The block was initially at resx c2.p *fyq-a mbp5b-xt 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 a 1 kg hao1 gl)b:h:oblo w x5qf)2z, dmmmer in one direction. After the throw, the hammer moves off in one direction while the stf ql,bw o2l z)b1hmx)d: :ogo5udent moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gvo) vdl4 wb4g4lxhi0.ives it kinetic energy. An hour after the fan has been turned o)4g0l b4.v4vh olxdwi ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a posi5wye:ghj. v g*tion of 3.0 m, a speed of 4.0 m/s, and an acceleration eyj*gvwg 5.:h 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 shelfi12yjk 7):0vxtzki (,m ym ztf 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 box has a massm ti7t:2jz,m1y)kx 0zyv (fki of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepowerezm0r5e8ugipu9 t;r ) k 92xdb9jylc ;) of power to a car's driving wheels. If the car myupc mz)xrle5d99 g;urik 082 j;teb9aintains 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 the jd+1x7i bq)n. vdh a)wzox:7lbottom 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/swhenw oqdjda:h7. xbi)v7)l xzn+1 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 -rkh7pzr-+ rdf05 fi6: 4s4rt jx mswbwith 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 = 240N. +7sfkd5-:r-f44 zjhprisrwm 0btr x6The 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,3c2)qz opnx *dqlq6,7ynp ft 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 the same distance F, what is its spee2tqz6y)3q,nq dcpol n p*7fx,d in terms of B?

  12.07: What is the net fmvb7b4c3 9n- o nvaxbw,a5 iiey;q(3 jorce acting on the object during the time interval of the acceleratiomb anv i3ov 7(a-bi wcnx4,je5;y3qb9n?

  12.08: Through what dyzra2uhrn 2/(istance does the object move during the time interval of the uhrz2 r(n/ya 2acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is d j8ljp x0-37c 1pt5leqr,tod changed from 6.00kg.m/s to 14.0kg.m/s in a ti tc,3lp58dj q l7e1oxdtprj-0 me interval of 6.00 s. What is 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 s-wqt9afe o/jrn6 o )/fpeed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represwa) qnjot9re6 -f/f/o ents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a: y9m kd22.j 2mcx:x8dt6 5caeoumzjv heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. T:e9aco my8zv6c 2 5xtjk2d2. djmmu: xhe work done by the frictional force is:

  14.31: A toy crane elw1 mb.: agskn1t3ae )xerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bloclkswg.me)3 ta 1:b1nak?

  12.18: A 1.00 kg object is released from rest near the surface qet0q+b9 6 pxiof the Earth, the gravitational force actix0bi9 et+ p6qqng 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 a height ho above a hard: r-l4gcaw4 up floor 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 balrug4c-a 4:pwll and its height h above the surface?

  07.06: A 500-kg car is moving cdg 7) f pj gq2voh)r2)+lv8xwat 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net fwfgpjhl)qd 7+ o8r )v2v)2gcxorce necessary to stop?

  00.26: A 500-gram ball moving at j+g4z91v 2x7i4ekza +mrtm ava 3x ca;15 m/s slows down uniformly until it stops. If the ball travels 15 meters, wvaxtaz74+ m gra;jc432xa91vz m ike+hat 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 ri ly *p1, exg v-l7njd+*(b6g6 sbmelenergies and the three following statements. Which of the above statements would be i*n ee6bj ,l1p7dv*(mll s+-gr6yx bgcorrect?
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 vep4 yio)am0c x gmb;/i*rtically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is th)ag/i0m4 mpiy box ;*ce change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest mrha5a5cb0y5 straight upward 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 m ah555ab0cyr 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 f*dl p6v y274r l+p4hbmxafj7a rom aheightH above the 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 on the object while coming to rfab lydr4*2 a6vlp +4hmp7xj7est?

  12.48: An object of mass M is drop t3qxuc5jwo(2tm(3nd ped from aheight H above the ground. The 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 new tucj(2mn oq3(xdt 35t force acting on the mass during the collision with the surface?

  96.38: A pendulum bo: 8viyx0d( byyk:pm1bb mass mon a cord length L is pulled sideways until the cord makes an bkm0y:8:yxi by1p(v d 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 inco j7b .7bbdxcjz,o,*g 4 qdxg7line of unknown angle. The sled, 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,7 ,d7bo *7bjz xgbxgqc4d.oj 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 from the sidewalk, along a 10-meter ram-z0o)scp;r4 brjwy t/p 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 on the carjw z/0 rs- pb)coryt4;tons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figurq l(p a)mi* ykt-ut)dci*;oz*e) 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 o(;-p)d a*ymq t itlc*ukoz*i)ne 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 m4t rr 9mgg)8)1 pyjmsdropped 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, how are the mechanical energies of the two bam48ptr g)r9j m sg1)mylls changing?

  11.28: A person throws an object of mass M straight upward with awkld*l0a-6ct8 tpu m5n initial non-zero speed v. The object rises to t ct0u -l dmlwp8k*6a5a 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 stretc/;ph7sxx6 ed bhes a spring that has a spring constant of 20 N/m. The potentialxs/ph 7exd;6 b energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energa;v a1 +:y.b z2y2qiinq1diyjy. What is the maximum speed it can impart to a 2.0-kg object ?iy.id1iq 2; 2 y1yj+z:vqan ba

  

  10.31: An object of mass M starts from rest at the bottom of a fixed i*)ky 6k-ydmbhncline of height H. A person decides to push the object up the incline in one of two ways with hdm*k6k yb)- yan 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.