97.01: A force F directed at an angle of θ above the horik09wc6sa9j zbww8b*a aiy5i;wr* bi - zontal is used to pull a crate a distance D across a 8 yb z sk9;6i* awj- irb9*iacawww05blevel floor. The work done by the force F is

  97.33: A softball player4fmmc52og/gsb sns;- catches a ball of mass m, which is moving toward her with horizo g2 m 5fcsg-mo4s/;nbsntal 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 her hand is

  99.14: A construction laborer holds a 20 kilogram sheet -* rh*p d*sv uiuue08dof wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on thuhis8 p-v*r* 0*e uudde wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a ;k 3:yfyi3;ae1r neji horizontal surface for 5.00 s. The block’s kinetic energy strictly decreafnyj 3:ayiei ;;1erk3ses 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 3 i23bz/eulyfds *4dp r* *ihn slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly d /s3bney*i4*r hd3filzu*p2decreases 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 exerte6; )in9t) dlq)tmzmsc4y u(zn d on a 3.0 kg block for 5.0 s. The block was initially at rest and slid m)zy9 4mitn)sncd 6tu(ql ;z)es 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 ton ojgdcypf7-y +ij(o83 cs4d + the right is exerted on a 3.0 kg block for 5.0 s. The block was initiallyn-y7i8jyg c +dfsco34(o p j+d 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 res 5 o-b 9e)l/w22hm.jxunlpre3u 7ndheton a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the.)2m9h lehnuwoux75e2 b- jp3d/nl er other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour af9.)8qpqzao v ;n5 ,sy7 e.. rb1wk hdwbgpwnk1ter the fan has b)o vy,gaz1d pbq1kn n7hp .eq.9.k;ws8wbr5w een turned 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 posir/z8z 5/f m )orifur0flrl.1ftion of 3.0 m, a speed of 4.0 m/s, and an accelerat rf ir /l)zm8ro l/zf1r.f5fu0ion 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 bookrooxl8 y*v) b:mlfm 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 lm :8*)lfybv xhas a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of powegl d+dt r8uz73r t37u+z8 dgtdl ro 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 w:d9 ;9nurdaw j6kbtv2/u cm/uith 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 conrnjb;6 dv u /a:/wcm29uudtk9stant 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 m3181pmmw 4vn yavjya2d+ 5rtw8wws p2oves 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 = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 mwj28wpyv+sm4npa 1 18dw 5yvw23a rt 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 res877fz/ilw r4u o+ 7qcq7u/hwovobh*mt, 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 to8 7vuilmc/ +w77/bwqq f4 hrh zoo*7uraveled the same distance F, what is its speed in terms of B?

  12.07: What is the net fov(;z1/ziy gwjhi tb, ls q.g55rce acting on the object during the time interval of the ag551. h ,v ylbw(sziqg/jti;zcceleration?

  12.08: Through what distance does the object move during the time inti lr 5gg v61j+vsv5goon* 6u4berval of the v46ooig vv 1u6*gn+5 lj gbrs5acceleration

  12.19: The magnitude of the linear m whbd 0b/j(ww9omentum 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 is the change in th d/9w(wb0 hbwje kinetic energy of the mass during this time interval?

  14.11: A crate gains 36iyrzy3s0250x4hi n sw .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 thsxir5z04 ny203hywsi e mass of the crate

  94.38: A force F at an angle θ above the horizontal is vs/re, g q.l ndm..1myia;h,h used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and .mnq,.;av . hs/mglie,y d1hrthe suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and del z0 wp6zu;:syx,hft, bivers a useful power output of 0.10 w to raise a block verticall; wxz6hus,y :t0zbp, fy 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 tvqsj(-w; 1 ayof the Earth, the grvq 1w;jsay(- tavitational 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 acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho aet: 9p zx:fz edo)-ov;*cskc/ bove a hard floor and released. Assumc ct ev-/; ze9od)k pso:fxz*:ing 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 its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barri.;,ghw 24rcpy dw2an gix2 -orer ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop - ro2h;wd,ar .w xpn2yg24icg?

  00.26: A 500-gram ball moving at 15 m/s slows so h0ia2u v.u5 ,dfgwk;,gxzlxx a 183down uniformly until it stops. If the ball travels 15 meters, what was the average n01u .2lh,5 8fw oxig, ;gaskuzxxd3vaet force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical ki:61okrc0.fw vm9 noor n jb,9enetic energies and the three following statements. Which of the above statements wobkfre: v9o0 .c19o ojw,nrn6m uld 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 iaaoeh-.nx4y3 q0c fv 3s tossed vertically in the air with an initial speed of 4.60 m/scave4y ho3 a3n q-fx0.. 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 upward fr/5asrr+rw7 s vom 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 averagera+ v5w7ss rr/ 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 a+mm *n*qe1euzglh lda6s ) )h.bove the ground. The object crashes into some soft earth and comes to rest by compressing the) 1m*q ae.dhunl)smlz*6+ghe 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 H8 k)1q(xz*8-luh idgcl k,lu h above the ground. The object bo8zlkudl-,u ilkc )(hhqg x81*unces 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 mon a cord length L is pulled sideways until the coos5+w qra4 :bhrd makes asr +ha4w:boq 5n 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 u +3kcth b*xf21f l6zlrnknown 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 2xlf1 3c lzr 6kft*+hbits 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 from the sidewxrpnog*3 0in( .0jzeyalk, along a 10-meter ramp to a loading dock, which is 1.5 metegr* inypj30x( zo0.ners 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 forcel,.q wjnz-ya5sn ua0) F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15azlys5j anw, .0- qnu) 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 bowlfn6*gkygnl;8nv-2iw 92* xg7b 8cvl0 ifoi cling balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. 0k6f8l f i9ngly87vn2*oi*g; -xbcgn 2lviwcAfter 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 n*ix/,k :7m3x lffr4znprc0g otb i)8bon-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 ofx7tkprc x)b,i3i8fflo0*mb 4/nr zg: mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a sprbv00zc dhukn16 2of8king that has a spring constant of 20 N/m. The potential energy stored in the sprind0o8 chk02uzk1bf6nv g is:

  97.10: A compressed spring has 16 J of potential energy. What is thez. 1b)o 1sfkw+vono y) maximum speed it can impart to a 2.0-k1ysw+)nkoboz .1o) vfg object ?

  

  10.31: An object of mass M starts from rbhd t 0dz7i3i)est at the bottom of a fixed incline of height H. A person decides to push the object up the incli)37ti bzh id0dne 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 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.