97.01: A force F directed at an angle of θ above the horizontal is used to wce:ltg( 0/)b+ ktfx dpull a crate a distance D across a level floor. The wwf)x +/dt:kgbc0 e l(tork done by the force F is

  97.33: A softball player catches a ball of u4r m)hzgn/3mmass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming con/4um mg)nzrh3stant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboardb-jatvkk(u f .f1)pm1 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendedjb tp (f-)1fku.kma1v on the wallboard?

  17.11: A 5.00 kg block slides with unk 5wjgqhl )w:zo4,mg 4iform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J imqh, 4 :kljo) wgw5g4zn this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acce+p 4we tx);; i9st7(hlrt/l t ebapm+nleration on a horizontal surface for 5.00 s. The 9 nhsa++7t)elw ltr ipbx et;p4(; m/tblock’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 exerted on a vvez 29bkl0pax w68(d3.0 kg block for 5.0 s. The blowz96pbv0a8kvdx ( l2e ck was initially 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 rm-j*mcd,(c gxight is exerted on a 3.0 kg block for 5.0 s. The bloccmdxj- c*m,g(k 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 reston a frictionless frozen pond throdf8p)+pkdvs *7 somy*ws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves offp*pms *+s ddo8k )y7fv in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it k3/wvmz v5+w4 s6anugc inetic energy. An hour after the fan hav3c/maw w6 gvzu5+ns 4s been 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 posi we3 *v+ay- yert b9d/0tbo u:pgz,h8vtion of 3.0 m, a speed of 4.0 m/s, and ae98y:obpder ,utg-vz* vaw/t3+ 0by hn 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 shelf cu 9f:lzx8yfgf1 c8v 7kq*s j4in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from thek7v8 *sjzxl 98u ff:f4yc1 gqc floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers z)sa*p h1fxn0 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 the magnitude of the retarding force acting on the 0p *sh)nza 1fxcar?

  09.13: In the figure02*gd*x+osteg d2fq sxc3- he to 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 ofF = 240x 0g*fhoqexd2g ct -23ss+*ed N. 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 moves with speedi b t)1zg6;4*7hi kc,hhjysfs 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/sw, gh*k;4shj 7hz)1y6cfs tbiihen 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 th qg ;w+y sb1ai n(9ek+wxw+welix26h9e right, each 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. Whenw ++q w;xw62keyhlix9+ a 19(gnbsw ie Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time +*3fvraec *vqpcizt3*dt 6 (c interval of the acceleratifvct6 +ecp rq*t(iz* 33acv*don?

  12.08: Through what distance does the object 3lhrl 39c/6lpvh0xdtkku)t */wf0csmove during the time interval of th * l)0xltk/tldu 6hsf3cr 0w/chvkp 39e acceleration

  12.19: The magnitude ofxizg4 8dpmht2xw9 u27 the linear momentum 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 the kinetic energy of the mass during this t 8di4pzu x9722mhtwgxime interval?

  14.11: A crate gains 36.0 J 3aq /hp un0n96ys yu )n0cdxzhzl;8n8 of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represe0 3zq;zpyh 0lc nn8d9unuh)n6 syx8/ants the mass of the crate

  94.38: A force F at an angle θ ab6w6 0v 8vz*h9jbdqsh.iiymp*ove the horizontal is used to pull a heavy suitcase of weight mga distance i0**z hijy9mpw .vh66 sqvdb8 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 useful power output nr*0(ejktft p,wlu.8uxs -10i2v f bwof 0.10 w to raise a block vertically at a constant spee8up.w( *v re wnlj-,tk f0 s2fbix1t0ud. 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 surfa( h*dvbxgnnc)10t5m )gbovm 0 ce 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 onbn5(0xdng0omc*)1v hm) g tbve 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 balz3l sa,by6 h,jl is held motionless 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 relationship between the total energy E of the ball and jh,3sabz y6l, its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/0j /r8((:/j ay1glru6vwqx7wk g+ kob7enpd ks. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the mi uegpqw/1n(7kk06 8:wr doj+rbja(xv7kl/ yg nimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly untilm 1 c/lpz9xpy;f-nau, it stops. If the ball travels 15 met x;-p1cuzfa ,ml/y9 npers, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carti(5vn x)l94c5 .m i .sgpvfdrds of different masses but identical kinetic energies and the three following statements. Which of the above statements wpi()ls 59i cn4vdfd5. m.vgxrould 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 inisuual:;jg x4 2tial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potsgx42ul;a: u jential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stau) f3k2i2lp vnauud6si( s w4+tionary concrete surface. The boy, of mass M, leaves the concrete s2luv u+ 6 iasf( u3k4nw2)spdiurface 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 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.xno3 ns htkys-6q:7/n32 nadt 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 onat/7tso dn-hk 2s33qyx: n n6n the object while coming to rest?

  12.48: An object of ma1rb d7s2ga 9j.7ut y7c nug;xcss 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 the magnitude of the average net for g9; yusj7 naudbt.c cgx1r772ce acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulll. earqx9 (7pxed sideways until the cord makesxqx al.e7r (p9 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 a )ziy+c,3qdq rngle. 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 ad+,ir yqcz)q3 nd 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 movl j*eg :f:d-u fv*f8xgl)svt-m *fyk9es 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 met l **fu-g:tl:)j e-gyx 98vvm sf*kfdfers 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 force F=50N (as shown in the figure) is applied+boj9g/soq0x jv)o* 4lv.qzk 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 rexbkl/*jv qjqs).zoo04+9 v go presents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are eat w3f j6o*ypa9ch 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 strikejwf 3ap*y o96ts the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwxkkqb*;l -0g gy s2 nu,+znu /s8w0qncard 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 b c+; s8 sgq0ku-ql,yg 0n*nu/zxk2 nwmaximum 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 constant of-*d+rna ntecfl ;mtmnk /- 32y 20 N/m. The potential energy stored in the spring nk2t3el*-m rmfn t; c+ya/d-nis:

  97.10: A compressed spring has 16 J y (lqn-bz *//8bvnitnof potential energy. What is the maximum speed it can impart to a- n nn(v l//qtiyz*8bb 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline ofxy- db)i xcz(dp b,p5 ywi447zuzgy-- 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? pdc )-zibbiyxy ugz-p,z7-d(yx 54w4Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.