97.01: A force F directed at an angle of θ above the horizontal is usec0 rvvno m m:i/fy(gmp6v(4u)d to pull a crate a distance D across a level fm(c)6yr(v4uo0 ivgm fpn/m :vloor. The work done by the force F is

  97.33: A softball player catches a ba ref; f0thx9i:e ( eva+dnfw29d8p 6sill of mass 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 forc;shed vwf ie628irxe:df+9ta09 fnp (e exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram si5svqk38 d 0hhheet of wallboard 3 meter abovevih0hq k3 8sd5 the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with n8i5gft5j pa ) uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to )pnt55afg j i820.0 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 accelerat1kv6rzo 1 bq6hion on a horizontal surface for 5.00 s. The bl1 krbo1z6h6 qvock’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 3.0 kg blri1p .-.k a 3fdt1ejyke.bu3 pock for 5.0 s. The block was initially at rest and slides oe3..k u.d3 -r afpe1 ybjtki1pn 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 iscehxa)e ,tu57:v:fw g exerted on a 3.0 kg block for 5.0 s. The blockxfw5vahe:): gcu e t,7 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 2ol1. n g)ugpnj m.ymbksu,*em- 3m 7f6tnd 5tfrozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one di)ts.5,n uto-m2 dmgu m en1pjlknf.g3my 67b*rection 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 17(d mzs jeumxa-n/p* it kinetic energy. An hour after the fan has be/x 1aedzp*u 7-jm(sm nen 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 position of 3.0 m, a 3)etllwa 4u-j5ca) j 5n e.*i5 tukzfmspeed of 4.0 m/s, and an acceleration jz)a 3uj5-n 5 4fc5 k)* lu.twlteamieof $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textb+;c3,wyo+1wmhxlrk 3p e9 8q8f atin hooks is on the middle shelf in the bookroom 1.3 m from the floor. If the jam rw;thon3ila,ce3x8q 1 y 8kw phf++9nitor 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 10.0 kg.

  02.32: An automobile enda9m- h0,niihdr5o /y gine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the hhidm9yo5/i 0 and r-,car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to thez( *.eb +cij9k 4mt,wgxblu- x 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 = 240N. T,c(*bx-xjl ziw k+g em .ub9t4he 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,ftuf.x-v hb2 5 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reache fxtfb25-v.u hs 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 starti2w(hfn: un xj+ng 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 distance F, what is its spee j+2(fw hnnu:xd in terms of B?

  12.07: What is the net force acting on the object during the time interb j0c+sztelrm 8j kmh.9/s4m 0val of theej mb+8r0ms9cm.z hlk4 /j t0s acceleration?

  12.08: Through what dism+fdg*h9tv- ntance does the object move during the time interval of the a+nf 9- h*vtmgdcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point5 :b lzcpvl:h8 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 m p8lch5:v:lbzass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spee dx xza vx-)kx..3up94iwf)de; e)bew d is increased from 2.00m/s to 4.00m/s. Whiv4azx; k.)x9p-ubedx )x3.d wefe)w ich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal iri.bz t.l a:0eo 7 h-vmn.l7q,t6ktnadr 9c:rs 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 byt9n.cn 0a,kl r: l b-etva q:rir77mtz.6 h.od the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outputw 5z8 sq47 k/m)-qp4btsumgo x of 0.10 w to raise a block vertically at a constant speeq)tus5m mz/ p4k7 xo8wq-b4gs d. 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 b hm,w9x9gp 6(abvdx (of the Earth, the gravitational force acting on the 19v9xapdm(x wbb 6(h g,.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 hog/g0y v3or;, lij2ev i above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphr i/v3ejg ,0li ;2ogvys 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 28 m/s. The driver sees a barrier ax- 7c6xnuqh9ao: 1 buvhead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net fu a6:u1bo7c xqnv9-hx orce necessary to stop?

  00.26: A 500-gram ballq48zt+s-z.4pzs.i3 d .5 hucuf kiwin moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was tp-nkqizi54z h.su3fwz. tuci+ 4 d8s. he average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differecb.l3 5 yevwczm+.5ugnt masses but identical kinetic energies and the three following statements. Which of the above statemygeb 5c.w5vzl u3 m+c.ents 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 vnaxa-ns2 i5)bjm8:catzo0 w/us9n: initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy whbusav j )8/:n -aca w02t9 zmxin:n5osen it reaches its highest point?

  06.20: A boy jumps from rest straight upward fromz w; oournl58dvypz :)jw(c8 ba j,2g- a flat, stationary 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 hc-8jzr lj (pz28 yw vw)bgn od;:ao,u5ighest 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. j; rxf.g:asd 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 the magnitude of the average constant force exerted by t :.sjr.f;x gadhe ground on the object while coming to rest?

  12.48: An object of mass M io*x6m6 rvc wy7kiu6y1s dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objec wry6m6*vxucyo67 1 kit 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 pulled sideways until the 9n*ox:hv cgk osn4t*6 cord make 4ov: g*to* nk6xs9chns 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 in9cej((wy jf/ n.mlc5wcline of unknown angle. The sled, which started at the bottom of the incline mojw9y.ce wl5nm/ j(f(cving 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 returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 1 y70.swnx8j6s/yvi) akcv5kz 0 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the8a/w ksvj0.ksxc invy67 5)zy 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=5ofiq7.81bm x i 2iyel20N (as shown in the figure) is applied for the 6.0 met elf 21o7yxiiiq .28mber 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 done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped ojjr/j,a1 phfw61f )yfrom rest from the top of a tall tower. Ball A is dropped one second before ball B. Aft1wy1o/hr,p)af jf6 jjer 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 initia8t) ;untb(wk,8 y90 tmt feqyll non-zero speed v. The object rises to a maximum height H above t yml8f(nu8tt,;qt ey wt9k0)bhe launch 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 that has a v4nave)t29oi spring constant of 20 N/m. The potential energy stored in the nvi)ote9 v4a2spring is:

  97.10: A compressed smuow r 9wv1b24v*-fespring has 16 J of potential energy. What is the maximum speed it can us vm- wr*bv1ofe29w 4impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts s+()tjyd* jlpt3 a-yaxgy.* o 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 objectxlto(ap*)d.t3 jyay y j-+gs* 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.