97.01: A force F directed at an angvo.c /8ftb i1:bke )l yxw,gf;le of θ above the horizontal is used to pull a ec8g.fb,)biwf / t; vyxlko1:crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches l6:6;kv33ewch wb qme a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a d q :cwe3bmw6; l3vek6histanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdvy5tz0yr/j iva: rj 30s a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wal3 rj/:zvv50j r yaity0lboard?

  17.11: A 5.00 kg block q)gyuqjg- n0m931l; o7qlzksslides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasel1 kg9onmq 7 lug-;zyq)q0sj3s 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 k 8c)d q;fq2bc 6vdx8c with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enerq) f6;28xk ccvd8qbd cgy 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 r0 i-vmv(th b7xtcd4/; n) qpztm4i 3tzight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horic7nhbv q)4x- ;(d3zmpt vt40/iztt imzontal 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 (i /yv8spd5 ,ltkdccci n9q,/bq 2)awd )(tuc is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface cb)s2ldq,wiu akid((cv/),y nt9dq5p c8c/t .
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionlesq-ycv0klj3z kc .a t8*ik44yos frozen pond throws a 1 kg hammer in o c0 o8vk-4c4qjyilkykazt*3. ne direction. After the throw, the hammer moves off in 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 ai rig4koyc ;hd 4n(ld;k-zc- c4awbl3 ;r and gives it kinetic energy. An hour after the fan has bee kobw -l dychglcn (z3r;i;4d-k4a4;cn 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 speed o2g(6 ytfwj:szam6xfxz , yo 6oz3 m66d)ll* zqf 4.0 m/s, and an acceleration ofgzs6f(w zm)zyzoj66 t3 fmday,l2xx *:l66qo $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the mi0y l; yfos3i uyb7b2i1ddle shelf in the bookroom 1.3 m from the floor. Iyois;0f2 yiu 17b3 bylf 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower)nh2r)lua-y2r-o dd (j of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mp )-2jrn2-hd( alourdyh), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves witc6xpzk+0os5 th 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 m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.ct6 o0z+ps 5xk
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 qrrub3m;wc (+0oo7w pbox 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 thewo +m 3p0bourw(;rq7 c 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 fromo gnggh5*8zv i8;7a9wc n+icd rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A hai9+a gg* h;z5ocngwc8n v7d8 is 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 qpr/x: fw 6 0znldb0z-on the object during the time interval of the accelen pqlz-:/d6wxzf r0b0ration?

  12.08: Through what distance does the object move during the time interval of th.q3p dpeii gmf4db7j0i*)cg :e acceleratiidb:qg.j*fep 0 g4 i)pi m7dc3on

  12.19: The magnitude of the linear momentum of a 4.00/f; fl1r/kh;ax co(a r 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/r/f;orf1x(;ahk l ac this time interval?

  14.11: A crate gains 36.uv(icox9 8 h)pgad6 e:g.50w c.wzmqfy d(* og0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Whicwodgeh.m6a8 wfq9o gug(*0 5vxy) .c:i(pz d ch one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used kwhvf bn:9o/+ to pull a heavy suitcase of we/:w h+9kofnbvight 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 by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power outphnv9,r m1 aepn9;g :(pnpju, dut of 0.10 w to raise a r9dnnhgv9,p:;, e nm au(p1jpblock vertically at a constant 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 olh8- dkj c3gcp9nc -,bf the Earth, the gravitational force acting on the 1.00 kg objehc -c lp 8n,c9k-b3gdjct 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 ho abk o/3m(/ 9c ad.kdc wsj0ds3apove a hard floor and released. Assuming that the collision with the floor is elastic, which one of the f ac.adpkm sd3soc k03 9wd/(/jollowing 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 movis( 56h3owm 8czc*fyjgng at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to st35c sfcmho *(zj gy6w8op?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it sto:d kfi 38w6zjtps. If the ball travelswzk:8 f3 it6dj 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 identid yzldx v+8y6v/ o7/sycal kinetic energies and the three following statements. Whild7 zdy yy6sv/ovx +8/ch 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 l kp0 eu*wjm2,initial speed of 4.60 mwk p,m0*l2e uj/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest strakvsk 6kc5l 2kb+rh6h5ight upward from 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 highest point of the motion. How much physical work did the average normal force of contact (N) k65+ sl vhrhkkc5k62bbetween the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from ah2g(q uc; jdhsc be*):;pcy:pveightH above the ground. The object crashes into some soft earth and comes to rest by compressing the eard :;s)(qeyc jgcp*;ch:bv2 puth 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 object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the 39 u36artf;f +vq:uif x x+ucj d0ho5dground. The object bounces off of a horizontal surfacq+v dhff:fao x9t5cudur3iju36+ 0; xe 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 force acting on the mass during the collision with the surface?

  96.38: A pendulum bobxn+izb- um8(ue r *(mb mass mon a cord length L is pulled sideways until the cord muubexn( m bm (+*-ri8zakes 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 unif* *wx64pg2(bq gmbyzs,ja t8xorm incline of unknown 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 dowqa x(tg4 ,b2b6 sz*wj*8gypmxn 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 twv/zhn *gl m2e:x :ch*he sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each c:vn 2*lzwx*he h:/gmcarton 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 for8oh znm; z+a)wce F=50N (as shown in the figure) is applied 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 represents the work done by +o) nwzz8h;a mthe force F onthe box for the motion?

  04.48: Two identical bowlix lj4o5; awio l(l2:-*s9sty q,pfsugng 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 ba*olu4;j2f soly(lgq-:wsitx,ps 95 all 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 massk/ fob rh *45wvn:m5tvbvi :-x M straight upward with an initial non-zero speed v. The obk w:45 vi-/ nrvvb*obm5:fh xtject 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 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 q- 8ut r46znfvmn-vit7ff +w4a spring constant of 20 N/m. The potential energy stored in the spring ntz7vv-q w4f+u64im 8nrf- ftis:

  97.10: A compressed spring has 16 J of potential energyk1 a/ to1oywd-n,argqg)71 fnv ;e-u z. What is the maximum speed it can it 1nw;a -fy7eaogru d-/gokv,nqz 1)1mpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts fyvwyabdpe) dkzu/-d8z )gxk,- 5cs.(6 m e/r 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 ueeb.w d8ysv-kpmzy/fx)/c d(z, 6 da-)gkr 5force 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.