97.01: A force F directed at an angle of θ above the hori2;g /nra )ehvd+fw 7nazontal is used to pull a crate a distance D across a level floor. The workfvar)/w+nhna gd;2 e7 done by the force F is

  97.33: A softball player catches a ball of mf5 8imj 9so lt0;*uo4l ljw.csass 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 her holujfsw4.5;t89ilsmco*j l0 and is

  99.14: A construction laborer holds a 20 kts xtcdnc b5/3 mg)c9z8sa-y- ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended o8c txy5-d-zs n3stb 9gcc)/amn the wallboard?

  17.11: A 5.00 kg bl9 vxius*ecg3me03ww8 ock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy gxw3im*ev8use w0 9c3strictly 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 sp xcg,/a3-u :us5nlivurface for 5.00 s. The block’s kinetic energy st ,3-cuvu/:pxgsn5 lai rictly 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 exerted on a 3.0 ki*bb i*u4nlzf2(0 ttyg block for 5.0 s. The block was initially at rest and slides on a horizonta 4b*b(tti*inuzy 2f0 ll 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 bl)*9xqkr1haa mnq-v)yq 6d6 tx ock for 5.0 s. The block was initially at rest and slides on a9m*rta)qya v- q)h nx16 6xqdk 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-le 36zk+knk pb 8pu c.vh4hi. hammer in one direction. After the throw, the hammer moves off izcv u4.k l pp8-hkheb.+63 knin 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 gives it kinetic energy. An hokiq6q185rxns;/ k cmi ur after the fan has been turned ic /k6;5xqk qs1 nimr8off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a positiontcais1 bav*m4x ir:6 j s:h6+e of 3.0 m, a speed ob1sa ih*4m6c :a x+r jsi6t:vef 4.0 m/s, and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb(5 gii aqop;.sooks is on the middle shelf 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 of 10 a g5op.siiq;(.0 kg.

  02.32: An automobile engine deli ppz6,8bv)+yf1 trc hfn0qtf0vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is p1t 68p t v+z,nr0hy0fcf )qfbthe magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.0k;6ld8y 3op y e7t;zann,j0u r0 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 3l yayk0t;zn6u pen ,jo r7d8;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 db 2*;*)ao3twznr+ h vw5cymcright, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slidbcwva3t2 mdh c*r *+5yonw)z ;es 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, each starting from rest, alongrtt)m y8g 4crno+ r*8a0d* zmm 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 s acmdo*0rg+4rr8 nt*ytz8) mmame distance F, what is its speed in terms of B?

  12.07: What is the net force acting on theea,m3dgw+ sa- x9hn8):k7 o8l ncx di2govnu( object during the time interval of the acceleratigw 89+lia( vemnca)hxo2n8s xd ,o3 n:7d-ugkon?

  12.08: Through what distance does the object move dur)ofg,hl2qkdztd-e8 mkg 4d1zq3+q z:ing the time interval of the accelef2tz d-h dm1kzeg qo+3qlg4:)kdq8,z ration

  12.19: The magnitude of the linear momentum of a 4.00 c;g nnrqq o vjcc8r/c a(d-g ,.(.du.ukg point mass is changed from8(ju ,oqvrn/. g-cc(; .gcrad nc udq. 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 during this time interval?

  14.11: A crate gains 36.5/ rru7igud2fq+ d2dx 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 the masi2 fqr dg d+ru/2dux57s of the crate

  94.38: A force F at an angle θ above the horizontal 0zx0fbc( tyz*n cx 0ekv*o 4m,is 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 the suitcastb 0,mo 04vx(exfy z*z0c*c kne is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliveru fj1b mlvt78pth q-,-s a useful power output of 0.10 w to raise a block vertically at a constan,tv8jul-1 thp -fb qm7t 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 neatc komn2j- kfq 8iobp434r(t 1r the surface of the Earth, the gravitational force jfq-23k1m 4oinr4 8pobctt( kacting 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 m(xkd xm )k*:dtotionless 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 relationx)kt(k d: mx*dship 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 ys 9 1/-uzkwclm, vkj,f3jw*oer ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net l*39mjy,fock jw, vz uw1s-/kforce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until aaoq/z4r6*5opig+m2hf )shk it stops. If theh fr* ogkmh a/z2ip)5 +q4a6so ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idenf(i( 6 jak 2xlqy(tlhh,2ydy:a5jd9r tical kinetic energies and the three followin:y ha aldfj 6j((dlr,5k2tqh2i(9y xyg statements. Which of 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 vertically in the air with an incmbq8y +kj0sh7 a/gp 3itial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential 7 mcy3ph8ksjgqb +/ 0aenergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concretelu5w0zfy 2k(m(;ncs t c/:lxp surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises luz f;pntxm:/2lw(y5k(0scca 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 tiapn wr5 ,k;h+,sin;ihe 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 oi wr,pk,5+sihi;nn a;bject while coming to rest?

  12.48: An object of mass M is drox.. )c( nv eylc77eurhpped from aheight H above the ground. The object bounces off of a horizontal surface in a collisionycr . 7ue e).(vnlhcx7 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 ,ihfvo. xv4 1 1z* jmhkn7chz;pulled sideways until the cord makes m4hjn 1h7k1vf ,zx*.v ;hcizo 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 u +z:59 al , 3ogrbv3savblazr:nknown 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 then slides back down the hill. What is the rz: +3algrv93basvab,ol z5 :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 sidewumd/3z2q6smoe4/onx g+l s/ halk, 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, whatgh2 m n6 /qusx/34m+sze/lood 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 f w/*,c 4 ll )p7wdfgz8zt4r.i7jipf myor 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 r i.)t8, *m7 4d/cpgwwipjl 4ffzz7 yrlepresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B arp(tgt02tykv6r 1u t/v e each dropped 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 balls changingv ky gtv(r06tp/2ut1t ?

  11.28: A person throws an object of mass M straight upw zx(69l ahcg8x-mjl1gard with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws g(jl axg-8 1l9xmch 6zan 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 stretches a spring that has a spring constant5ta lqub)3ac: lu3uu- of 20 N/m. The potential energy stored in l u3a-:5buct3l u)uq athe spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxi7otkpbu6nc: b6*,0l ig9 gm /ool 7qvmmum speed it can impartq9vol6ouc6 gbpbt7 /m7*kn oglim: 0 , to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline ow 1sh.mllc+j /g67 rhsb.xr-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 constaojc/.wh lblg1 r6 +sr7m-.h sxnt non- zero coefficient of kinetic friction between the incline and the object for both trials.