97.01: A force F directed at an angle of θ above the horizontal is used .lo7tcx;)gzm to pull a crate a distance D across a level floor. The work done by the forcczx.gt7o l;)m e F is

  97.33: A softball player catches a ball of m;lqpdq cwg.zsgb -dn n)- o.g, /tv3zj:s, ko.ass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, hev-,.s p g kb..otwcg,q j/zlqz:3 n-)ndsd;ogr 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 3(g5urord4x q 0o.m or)ya4kgzj *du8 sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshowq0)8*r 5x(gj d3 .rr uk m44oaozguoyd much power was expended on the wallboard?

  17.11: A 5.00 kg block *z arznas r/*fe 0sm/.slides with uniform acceleration on a horizontal surface for 5.00 s. The blo *r*/zs.nr/ amfzae0sck’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 acceleration on a horizontal su2lqp1s so io2wn55tyov 9m(f (rface for 5.00 s. The block’s kine l1n9p(wo fy25som 5s itq2(votic 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 rpuzz c7gn)) )sight is exerted on a 3.0 kg block for 5.0 s. The block was iniuz )7p)g)scnz tially 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 j++cbao(rf 9kis exerted on a 3.0 kg block for 5.0 s. Thbfjk( 9co+ a+re block was initially 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 restoup7cn) g)un+c idi5 4rn 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 other direction. Which of the following correctly describes the au rn)45c idp7cgn)u+i bove situation?

  03.14: A fan blows the air and gives it kinetic energy. ()bva lwz:) sj,o:ls w An hour after the fan has beew(saw :sj: v) l)obzl,n turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 k6tt(1t 0ojndeeml-b6u 7,wisg has a position of 3.0 m, a speed of 4.0 m/s, andeml0ts-6(wt ,iejo6u b7 n1td 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 sheo4m6:py/ u p/f4cn jiblf 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 mass y64: noj4cb/imufp /p of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 3pvkc5o 4d3kl/ 2 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mp d5cp3lok 4vk/h), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with s0r5v c dvun+8vpeed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slidd0v8vnvc ur+ 5es 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 rig3 rrvojkztfe+lk/ofi0*f mh ,c 9n7-)ht, a box moves with speed 5.00 m/s at the bottom of a rough, fixed iojz0 f*lfi,co r kn) f3-tm9k/e7 vhr+nclined 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 incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, e 890it) /ps0l kgfteruach starting 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 distals f9g)8tue/0k0ir pt nce F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time ix6n jc5.(vpxp nterval of the .( pvjc65px nxacceleration?

  12.08: Through what distance doesz0 hzh.y)+7ofsguriy-/ xm v, the object move during the time interval of the acceleratiyr)oy. us z/7h,gmvf h-z+x0ion

  12.19: The magnitude of the linear momentum of a 4:oxqkra 9z fj 7j0.v;c.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a tar7xjok 0.f9vq: czj ;ime 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 speed is increased++b1sd 3h(h zsm9,ru:ix alv,b1wq mg.ky5v e from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the 3,y:g9k+m.5bvmrl swv1ea qsxdhi ,b(u+1hzcrate

  94.38: A force F at an angle θ above the horizontal is used to pull a h ;xcf* o*)lxberz 5j)yeavy suitcase j;)e)*boz5xl *ycrx f of weight mga distance d along a level floor 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 us mj+4-ywjr;ys4p3qr8lmm-p z eful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speejw 3p +84rlm4m;sr ym-pj yzq-d will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neagbxht15vnocsej5 k*; wa5 1c4d.d o w*r the surface of the Earth, the gravitatiw11b5*adg5k.n4wvx;cjos* e t ho5 d conal 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 above a hard floor and rele8c5 qg1 m)( rvu lrzlrr+3axp)ased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationsmu)axrq1p)8c(+ v3gl rrrl5 zhip between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at0al6az*va0, ; kzsbtc 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 forcebav z l06k t*sa;zc0,a necessary to stop?

  00.26: A 500-gram ball moving at :) zzhcuq6s+p15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied s:zq)+czh 6 puwhile it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinet2j8e1msi 3kncic energies and the three following statements. Which of the above statements would be corn 3skj12ecmi8 rect?
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 thea l+lx:nqm9r4 air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its : q+r4xnm9a llhighest point?

  06.20: A boy jumps from rest straight upward from a flat, stbg.lbarb4- qd : ayx3.ationary 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 moti.3bgay:bdr4a x l-b.q on. 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. The object o.llf8t r.q7n; e2wkh 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 fo.qf2k7; n elo8 twrhl.rce exerted by the ground on the object while coming to rest?

  12.48: An object of massly.ka;,ek he y3h t41r M 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 rises upward to a maximum height H/2. What was 1e,t3 ye;4kah hlrk.ythe 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 lennwfaqqkl-qc bs.uhfm:(9y)un8 t9 (4 gth L is pulled sideways until the cord makes an a.4m qcf( t)(8 l:kqs9-wb9 uufnhnqa yngle
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 a z6 e6ubpdii(qlj gt 1/h6cb;jl7e3hpk9ks17 ngle. 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 startingq u1gh71;/i hlik7e36b9bdpzts j (cpe6kj 6 l 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 1ukva,o) 48 drby d93yw0 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is wy 4,vr 98bodk u3)dyathe 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 figurqo.uwl / 8hfk+qjm6hh;b +1ds xj v(b(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 one of the following choices fj hj +qhuw6ox(d+1 hsv;.bk8(ml/ bqbest represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling ballsmxu 64 0nf1 y8dwmtfk/ A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball Bt8/4kfmx6nmwuf 1d0 y. 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 zbkhyw7 )v 34tinitial 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 whk4bwt)y z73 vith 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 stretchyyqm h1fg4i-0l d+dezdpgm p9zl+, )-es a spring that has a spring constant of 20 N/m. The potential energy stored in the spring g z-9 y- p+qymh 0id,dl)fd4gpez1+lmis:

  97.10: A compressed s giu32(cm s( nx7,/vit bn;ekvpring has 16 J of potential energy. What is the maximum speed it can imtc;7/i ui2 e(xgn s(3,vvnkm bpart to a 2.0-kg object ?

  

  10.31: An object of mass M stavnrn *qt::-tz+kz(mfs:bq 0i rts from rest at 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. I : v:0nqq(*s ztrn-:k+tzfbimn 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.