97.01: A force F directed at an anglud:zk.o 8e inbd250 mve of θ above the horizontal is used to pull a crate a n vokue8.b2did5m0:z distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball ox4php vxtr*m(,gvuwd *o: .3hf mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dist p,rd 4xutxo3(hmhvw:**p vg.anced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kd3hxhoci7 :5v xkyf8.ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow muchdx. x:kovi3h85 c7 fhy power was expended on the wallboard?

  17.11: A 5.00 kg block slides wit7ij yy4ql *er-gt4 0blh uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to g40l-y i4jqrl7y t*eb20.0 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 8joa:uaqkmp;7y f1t cxoo1 6*acceleration on a horizontal surface for 5.00 7y: co6o1 8 ftkjoma1q pu;xa*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 the right is e8:fve d+ wqus;h,)ogu;s:f maxerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sli+ m;f;d hua )fsgequ,w:8 :vsodes 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 exertedl(o;.l 2/ hi+peggv ku on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on av l/ .lho e2gi(;+gpuk horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fric;a2+03slc cbh.ol2t* ycwise tionless frozen pond throws a 1 kg hammer in one ol.23e0c;h c2lica*t w+y sbsdirection. After the 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 hcl2mda-. frur3-.hi gives it kinetic energy. An hour after the fan has been turnhufhra2l - .-d3cr.mied 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 spwga q+ be,+,n.p 1j9nnb-j;x ma:sxineed of 4.0 m/s, and an accelerationx, +n9,1w m.aq:bbpx -ngni+ ne;jsj a 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 pm/jzqw(:p kx+b h*0p from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much woj+pp bwq*0 : h/zmp(kxrk does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers bl:/np //*6fh ok foiouag/qlij/+ 1r24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 ik*/+/lo/oib/rh6jl/o unf gqpaf : 1 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 l9 9eaa.:x zot8k*lbz3ffd 1n5.00 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches zntf1 b*zldfe o ax.k8la993: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) j4kh f:buge2b g+te t14u,yz the right, 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 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 m/swhen it reaches the top of the 4g4t)jgkeb1b+f, u:z eu 2hytincline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel tohv3e q6 q9q9x*ty wv(re5 ki,wkwyp:8 the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling *,:e(wk iphv y e9xk85qr 936wvwyqtqa 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 aa r*r4tp2 :xvacting on the object during the time interval of ther x4: apr2*tva acceleration?

  12.08: Through what distance does th0n d942 eksvrbe object move during the time interval of the acc04nb s 2evk9dreleration

  12.19: The magnitude of the linear momentum of a 4.00 kg h xqjs*u.:t wbv4agm0g-3c a- point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time intervab3g :xva-tg.* su0wc-h 4jamql 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 speed is increased fr/kcib5*xki9 zre4 (o1i5 9ssvhgo+m vom 2+ 5h/4 oe*gm99iv sio( zrk sik5bc1xv.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 t/f : ou2opv7zzhe horizontal is used to pull a heavy suitcase of weight mga distance d along a level f/pzo v:f7o 2zuloor at 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 usehx: sconashpq:(y8,1hr6ag7 /n o jb-ful 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 oqj r hypb:ahs xo: (a 8/,g1-snch6n7block?

  12.18: A 1.00 kg object is released from rest near4 -u6mr:okkup 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 object as it falls 1.00 mto the ground, which o:kkpu4 rom6 u-ne 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 he ts:j19s ;mtqjight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graph9sjsjt; mt1 q:s 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. 0mzw g3h8p .kec0. wcdThe driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the 8 pzdhk3w0e .wcm.gc0 magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movingp (u7 fijcvizsdj*vj 1d(.rtc6) ,cf . at 15 m/s slows down uniformly until it stops. If the ball travels 15 )vuzciivrsd,f( *.(7jdjjc tfc16. pmeters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massesx3j )xx5n160 vhyql;s n7xruy7yv.bi but identical kinetic energies and the three following statements. Which 7yjb5x. uy0x3 y7nns1;rxih 6)lv qxvof 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 vegc4i9 /+oofjrsmc9 dt6ii))lrtically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, i/)l69cdi)t4 rgio9jm+ o scf what 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, stati: cgw62xg 6jo xtjwi,qcw am.6pr123eonary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a dis:garti16wcc2eqx , x.ojjw g26m63wptance 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 fy9+vtls2nl;e f3l j.a 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 negligiblt+f2s e;3.lll9j nayv e, 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 fmh)ffa.fqt,. sbr0 2q qh) v9M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then riseqv. 9 ,qbff2 m)r)0qta.fhsfh s 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 6d iu j;s)lqbkhc) kg/y fs;)7cord length L is pulled sideways until the cord makk i6clf)qsgbdhkys) /;u7) j; es 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 angl:m(yxz gt z-4ne. 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 then slides back down the himx4-ty g zz:n(ll. 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.z5yi 0aj*llk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a .5l0lyazijk* 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 g(0 zk ajf:.0lb2 a uebzpec-/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=15 kg. Which one of the following choices best represents the work done 2k( le zuazbepg:f a.c-j0b0/by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dr+( wbjyx.r2w8 +rnzj2 q kyiz6opped from rest from the top of a tall tower. Ball A is dropped o (j w2kn j6r.2qwrzxz+ y8yi+bne 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 objeqnr46ffi )26ut h 8q-q*hvm wfhl/wv4 ct 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 0.5M rise abqv/ 8* mv6n 4 hfhw4i ltw)fu-fh2qrq6ove the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring consta/02 l2kz* n:a: ppgzmln d8wsynt of 20 N/m. The potential energy stored in the springpl2da :2nkwps*0 /: 8yzlgn zm is:

  97.10: A compressed spring has 16 J of potential energy. Whatxl +plg+w) /y +sqkel n4z/of8u8eqi 1 is the maximum speed it can impart to a 2.0-k/4)e+lyi/ eslnuzo g+wfpl xq88+ 1kqg object ?

  

  10.31: An object of mass M starts from rest at tcs6pniu 4ckoz- 4js54he 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 done by the person on the block compare for the two trials? Assume the same constant non- z s4 pk6no5jzu -c4csi4ero coefficient of kinetic friction between the incline and the object for both trials.