97.01: A force F direct ba)tw:d(4oe9nib9zrf r2 gp8 ed at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done 89 i(b )atzdrgoep9:fnw br24by the force F is

  97.33: A softball player catchesg,aa zze9r4w2 a ball of mass m, which is moving toward her wi,9 g4 azrzwea2th 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 hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 muom8 k8xmr f0+eter above the floor for 4 seconds. During these 4 secondshow much po88fm rx+oku0 mwer was expended on the wallboard?

  17.11: A 5.00 kg block slides wigpimmsw a47+d7b+ j-f th uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetipwmdsij +-a74 7m +gfbc 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 acct0uhva6, xb5k eleration on a horizontal surface for 5.00 s. The block’s kinetict5,0 xk vub6ha 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 exedw*7lgj; f4h yrted on a 3.0 kg block for 5.0 s. The block was initially at rest adwyj7l f*g4 h;nd 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 jo bmi;4 6dl7fright is exerted on a 3.0 kg block for 5.0 s. Tb 64fl7;j oidmhe 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 reston a frictionless frozen pond throws a 1-t4b7 ct rx)eq kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other directiont 4-rtxqe)bc7. Which of the following correctly describes the above situation?

  03.14: A fan blows the ai(yfbwyza4f u5q-(/ ls r and gives it kinetic energy. An hour after the fan has been b-y((fyzq aw lu4f5s/turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant,*cz :kktkjy8 :wf t*+q-u5dj k a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an a qj+tfkk*:8j yt*zw-k5u kcd :cceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old t7*0xxss.3.uwn insa p; /vzluextbooks 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 ms* n0is7naxwzxu3u/.p ;l vs . from the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine del.: l3bimyzt0o rkd/ a:ivers 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 o30: r azi:yb.l dm/tkmagnitude of the retarding force acting on the car?

  09.13: In the figure to t1hykjn,ws-q r)u 4 : whn1vi.whe 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 pusqwiwk4wv) y.nh1j nsur 1h,:-hed 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 right, a box moves withvf:y+e64o*loyiri j* speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top r6f *v: +i*oli e4ojyyof 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 f67)uk ao lta9the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, u97a oa)lt f6kCar 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 timeo+-j t+ . hm.r)jk7swnrapml * interval of the acceler. onr p+jslw*-.jtar+m7)kmhation?

  12.08: Through what distance does tg2s)sm+9li ene w 5is;he object move during the time interval of the acc wi2) sel9igs;sm5+eneleration

  12.19: The magnitude of the linear momentum of a 4.v 0.m,w11d 5lbxmfypd 00 kg point mass is changed from 6.00kg.m/s to 1v1 fmyd10xw,pd bm.l54.0kg.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 36.0 J of k 7evl+th nlkw6 9v8(s3dwyjul,h 38krinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followingv83whr97jvhd,ywun3l8t k 6l+es(kl choices best represents the mass of the crate

  94.38: A force F at an an wdl1fvrgh3:s5p06pzu1 -hj8 8ff xpgq i+tu -gle θ above the horizontal 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 suitcase is μ. The work done -:350fqs1 rpt1f6hih8wfuz dpgj+pv8-u xgl by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outc 9- ll*ryz2pqput of 0.10 w to raise a block vqll 2cr py*z-9ertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objdplni ;z; l1u3ect is released from rest near 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 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 du1z3;ipdu ;lnl ring the fall?

  96.18: A rubber ball is hj+obkeiz +qkp , )(fl/g5mc.r/j gfd ,eld 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 reegl+ rc/jmo5zqfk ,(dp gfij+ /),k.blationship 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 on7d.tzr e*)v2 pjsk;fgt)(t a barrier ahead. If the car takes 95 meters to come to rest, what fjg).r7sn(d2)k veto;t *ztpis the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If , cm1p6 q5p r (2wf8coaqnj8skthe ball travk s1 q8pf5rap,wc 6(c8qmn 2ojels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory *nk pc0r(2qq;ga( qoef9 dm;dcarts of different masses but identical kinetic energies and the three following statements. Whicdg2m(;r (qqk;q9d0eo a *np fch 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 eys4m- ti.-gx air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change-tx i4e- ms.gy in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary co oqj6c5h4 q.ld75s gponcrete surface. The boy, of hg 6qd 4ql.p55jsoc7omass M, leaves the concrete 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 is dropped from aheightH above the ground. T0kw6ahng2 +rvx m uqcme,l355 he 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 m3l,hcena 256 0rq+xumgwk5 vthe average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. Thejz 3p8:+ur vbg6x vab3 object bounces off of a horizontal surface in a collision lasting time T. The object 3vgbvapj:6u3 8zrbx+ 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 pulle ur)8p6 zim0uc5lvto0d sideways until the cord makes al8p5 u rzi6m0o0tv)uc n 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 unknownvzu(mb6 r1v -fr18gft 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 sled's speed when it returnstz-rb8 vv6 grmuf1( 1f to its original position at the bottom of the hill?

  06.09: A deliveryman mov8e 4 pk/xc*qmges 10 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 the total work done by the deliveryman on the cartons to move them to themxqk/ep* cg48 loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied dzftw9 w+ -z9x8i5kn hv)rh7g for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one og5zzw wxvi978rk9-tdn) f +hhf the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling b* gqjmbxie :6:alls 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 dg e6b:*j ixq:mropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws anqz,wr yf*h1axk9l : 7o object of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch lka*x o:q9ywh,rz7f 1 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 stre /(txs1e0kxf rtches a spring that has a spring constant of 20 N/m. The pot/01tfsrxe x(k ential energy stored in the spring is:

  97.10: A compressed spra08hdyca4 ep1 ing has 16 J of potential energy. What is the maximum speed it can impart dc8 104ae yhapto a 2.0-kg object ?

  

  10.31: An object of mass M staruzofaj3)4 q2- iiee3 lts 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. 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 inclineao3j)4f-3 qiuezi l2 e and the object for both trials.