97.01: A force F directed at an angle of θ above the horizoni 8 )zmpu/y,)ikw4 fektal is used to pull a crate a distance D across a level floor. The work done by thky)84 m ei,i/wzuf kp)e force F is

  97.33: A softball player catches a ball of mass 8 58*w /a slko *qo;kmv/vsnltm, 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 exn;vqk/ 8 *s o5oklw mvta8ls/*erted on the ball by her hand is

  99.14: A construction laborer holds a9r)+jx/mh z)v6r2 wekil ai(y 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondsho rjwa+iv ymzliexh)/k29 r()6 w much power was expended on the wallboard?

  17.11: A 5.00 kg blia9iuq lt6*6aoq51os/m* oeo ock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s 6 sl /* 5uqotiioaae1oq*96mokinetic 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 ty 9 oyf/a:l8nhsl vb)6x9hc9l ;b3r )fo1f ps with uniform acceleration on a horizontal surface for 5.069 p no9s /3xhfaflyvbo; 9s)l)rb1c:yft8 hl0 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 exerted on jqg5; 2,mpvwma 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horw2 pv,mgqm;j5izontal 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 /5/hw:e1vc3:hjlt mqr*+mwdt9 kcxe kg block for 5.0 s. The block whe /mdw:9+t5j hck3/:v1q x w*letcrmas 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 throws mom:w p54chy)x*kw 7k 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 follow p cxk5h 4mkywwo7:)*ming correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic en4;ikaih(x7f o1trxn m.3i ;y*xb6tjb k1 x+vvergy. An hour after the fan has been turned off,6 ovxi(yt fii j3b7x1xm. *4+b;rx vknka; h1t
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 rs,kc ed9dz1br:n5, x kg has a position of 3.0 m, a speed of 4.0 m/s, and abc,e1n,skxd r d 95:rzn 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 shk8zuurbt)ca6 3q;v +lelf 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. T q 3t6bvzur+aclk8; u)he box has a mass of 10.0 kg.

  02.32: An automobile eng .:bkp ;/z vbplnh-0vv0uhj-k e0y6qzine delivers 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 :p vqh0b0vz-ke0;p ynkzvb jl.6uh /-the retarding force acting on the car?

  09.13: In the figure to the right, a bon9tpk4u.*a/-w5i x pzz/wb fqx 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 = 240N. The box, of mass azwx.q/p4*un i/ ktf-wp b 9z5m= 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 twabh8. s - v,ouq*g:epo 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 paw,:.*bu qoh -es8vgpushed 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, along a straigga5te*f fx/: ehc3sp4ht road. Cas4 fag35 e/tpexhc* f:rA has twice the acceleration of Car B. After traveling a 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 acting on the object during the time i ;gwvrech a:7 3scw* brhthl*4l3 6w5interval of the ahbw h wvlhswt;rac 6*g i347rl:53c*ecceleration?

  12.08: Through what distance does the obe n0uqxt 1+lj,ject move during the time interval of the accetj+ ux1,0qn leleration

  12.19: The magnitude of the linear/m6x8 d,*owikvfoz * f momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s *km w6voidx* zf/,o8fin 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 36.0 J of kinetic energy while its speed is increase9 b3pg,vg we0;bmme-ud from 2.00m/s to 4.00m/s. Which one of the following choices best reprg9- b g0e3 ,pvebw;mumesents the mass of the crate

  94.38: A force F at an angle θ ab:y ( x*k -ooe-xawctf9ove the horizontal is used to pull a heavy suitcase of weight mga ox tf-9ecway: kx(-*odistance 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 deli5da-rjys0)q;yx ropxr(.z 9nf(/ x zbvers a useful power output of 0.10 w to raise a block vertically at a consn zb x0/(yxa5(z.;-r r9 prqoxyjd )sftant 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 of the Earth, ttkn u3m8q36,u *ynu arb7hhy0 he 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 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 objectn*kb 7q8yuu3rt3n um, ha06hy during the fall?

  96.18: A rubber ball 8+szjo/e/va5.vs scl is held motionless a height ho above a hard floor and released. Assuming that the5 zvs/a/o jc+vss l8e. 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 n4+y3o2nwq pf28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to +onqnyp w423 frest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unifel47 ci.qhop+ormly until it stops. If toh 4qi.e7lc +phe ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratoryezhiee*./ g5ryk qg5z0/ op j3 carts of different masses but identical kinetic energies and the three following statements. Which of the above stateme*epg/rk eqhyz0/ e.53izojg 5nts 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 airalw0a:vu ds3wnqm ,yo7),i7r with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest 7os)naaiyrl0v,d w7 q uw :,3mpoint?

  06.20: A boy jumps from rest straight upward from a flat, stationary concre 9kv8ixn3prf(d 6ma1-ct s /umte surface. The boy, of mass M, leaves the c 1cu 9tkp3/m-nr(xvf sd86iamoncrete 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 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 iv2z1 eo :aeea +l9i,ucs dropped from 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 negligible, what is tz o 9evl+aaeu:e ,21iche 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 frok3dy:+azz/t0umxh4 ct1hcqi -0 c w,u m 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 ne40c1zih3 kc,x:ma+ 0 /uq-twzc td huyt force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidewayfdo,: kzf. x(g0di )zes until the cord makes zzd0gxf(.: ko),di fe 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 angle. The slx y,zdb:,il g+.bx)xu ed, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above xy)glxd: ,,xbbi. +uzits 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 sidewalk,;ac r nbnu// 2wnn sk72yy(v5v 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 the total work done by the deliveryman on thewr;cu2y 2 nv v/a5ybnknns7/( cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6.oaj69e 7s 6vjd0 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 done6o j76evj9ds a by the force F onthe box for the motion?

  04.48: Two identical bowlkt yfwb7hv: l tki4;93ing 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. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two bfvk9;3 l7y tkt:bwi 4halls changing?

  11.28: A person throws an object of mass M straight upward wit-bz *v:x ,imd.+rh *8mplsl pbh an initial non-zero speed v. The object rises to a maximum height H above the laun -z8s*blpvp,mrx d*. h +ilbm:ch 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 above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring j*m1 gyi,3u8 k0b8)s yteuoxithat has a spring constant of 20 N/m. The potentia1e yiok8 3sj0 *xyi8tmg bu,u)l energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentiy 0z5oks8(qzxeqsh 0:al energy. What is the maximum speed i se0(y8qo qxzksh :z05t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from restz(.af; gu xz6iz l(f7g at the bottom of a fixed incline of height H. A person decides to push the objec7.6 zu(zgg(; zffl ixat 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- zero coefficient of kinetic friction between the incline and the object for both trials.