97.01: A force F directewp.to 8z uai)b.k, 6eanzj6m208ndu dd at an angle of θ above the horizontal is used to pull a crate a distance 8m. ke dodiup nu6b8z.a)z 62j,nta0 wD across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m,,hai ip1g1fx, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. agi1x 1 f,pi,hAssuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer ho/jv v tboe;h ab9,*oh.lds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. /v vbh;o ,jtebo.ah *9 During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratiog60p4*2ijyxz+te+tw7z0 fa kk sxh ;en on a horizontal surface for 5.00 s. The block’s kinetic energy str 4x0k t6sf h+i g7*ywxa;2k0+epzjzteictly 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 slidesuo-5*izulc 7v with uniform acceleration on a horizontal surface for 5.00u7-uclvozi 5* 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 hwh lcc4u*9cb,q8-nsz j10en directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sur9ns *u,qhj e1cnc4 8wb-l0h czface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force d5t w2vh6mw2vcirected to the right is exerted on a 3.0 kg block for 5.0 s. The block wasc6wt v wmh252v 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 renba ,))y;thyg ston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the hn;gy,t bya))student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air efki, b* :: zzx)c/afwcpg x:-and gives it kinetic energy. An hour after the fan:xeizxg:: fw-z *k) ba/cp,fc has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mp:f.;hvzra :d9h38+rn aus cuass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, af:8 aacs.v drn: zp3u ru9hh;+nd an 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 in the bookroom 1.b nm./(nsiaw)6c y2 +0r )s z )4bjttizai1rwp3 m from tm +0wsn z)r.y2 wt)tis4ni( /rbp1a 6jc ba)izhe 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. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of porx6k7.wgs f4 hbm v n4+gxbrw+jc8w97wer 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 rbhn9 w+vw 7.xxrcwg6kbj8s+4g m 74fcar?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s a)9mzn s5vn4e5 eetz:xt 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 constat9z emn)4esn5 5: evzxnt 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 with speed 5.00 m/s at the bottoyqbjhstcwg:4 u4 *)s6y9jd7 fm 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 spee tdyjqjub4ss f7g*: 9wyc4)h6 d 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 00 auo0 vr6wkv8hp,xsthe right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A 80hrvps,xo 00ua w6vkhas 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.jpku) c/, .lxf b/hcj on the object during the time interval of the acce .hf/.) /,jj cpxckublleration?

  12.08: Through what distance does the object move75ewc f7gc tr; during the time interval of the acceler;w7ec5g fr7 tcation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass e7n26a/widc gtn( c 9lis changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is w7(cde at9/ cnn2l 6igthe change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic ee6tc i.-tmr8 znergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of thzr tc 6etm.-8ie following choices best represents the mass of the crate

  94.38: A force F at an angle θ abo 4zdyy i3/2fhrve the horizontal is used to pull a heavy suitcase of weight mga distand y rhi24/zy3fce 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 delihmo,gvd4mksl /o60 6nvers a useful power output of 0.10 w to r/m ,ghml60 knoo4dsv6aise a block 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 of the Earfeju77:jh ;dsth, 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 obj;hue jfjd :s77ect during the fall?

  96.18: A rubber ball is held motionle a k;/aw)w(uk2)dpekl.em fb4ss a height ho above a hard floor and released. Assuming that the coll ;we42(ubme.)dwa/ap)l f kkk ision 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 28 m/s. The driver sees a barrier ahegcy)f dn(y 8twt**h;bad. If the car takes 95 meters to coytyt8*wd*cf ); ( hnbgme to rest, 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 uniformly untzh m0.,k)6 qv3g(dh0xjo/ glte +qnxtil it stops. If the ball travels 15 meters, what was the averam o.0)tgkdz leq v6xgh+h0jxn3( /,tqge net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetie i3sd*w d*q4(fixhg; c energies ani*dg*ex(3wsi fdq4; hd the three following statements. Which 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 a9)ptr8u( wcdxznxw*;tnf7 e0ir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the cha ncwd7pe80rwz)f 9*x(uxtn ;tnge in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concre6e; cyuo1j4, ed 5 jz1,+spddg7 kiuyate 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 6du,1e7oc,ye+1 d yz5jpsk i4daju;g 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. The objefoy 3*c ska dtzdvmhw7 -j;n(7w:29y rct crashes into some soft earth and comes to rest by compressing t* kn2zj7ocyh7fv; ra swddty -3(w m9:he 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 on the object while coming to rest?

  12.48: An object of mass M is droppes*q( z d)j.kued from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objqke us)(dz *.ject 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 untxd909bhsjy. .zo+ 0 sxdgur1qil the cord makes an +xqdgo.syhr1b 99 j 0usd.z0x 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 ,zriftu h9n4/q dnmj .)3k)ulup a uniform 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 down the hill. What is the sled's speed when it returns to its orz4n )ut ud, )/k.lji3qr9mnh figinal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, a-kwd;l: s rbl;long 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 cwldsb lr;-k :;artons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is ap,im8 zl+b t 1wza qzebf/4zb m;rh)4-vplied for the 6.0 meter motion of the box upward along the incline. The mass of th )4 z8vm,lbwb h-+/rmtf 1zz4ei;baqz e 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 from rest f0( eivt 7ztpy1rom the top of a tall tower. Ball A is dtv7(e 0pyit 1zropped 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 balls changing?

  11.28: A person throws an rnm 1 lk)8 ix:frp9bb:object of mass M straight upward 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 maximum height does the object of mass 0)rxmlk8fib :b1 :nr9p .5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring cons4mbw,o6 )vk mip2leoita )4q bhl(y3*tant of 20 N/m. The potential eni vh *t24q36l lmpobkbyim4,())eaowergy stored in the spring is:

  97.10: A compressed spring has 16 J os6*m h2wq ews9ky) ztxj4 *4oe 8isfs3f potential energy. What is the maximum speed it can impart to a 2.0-kg objexhjkys6e*4 2w)of9s* t8s ezs4 3wq mict ?

  

  10.31: An object of mass M starts from z znf)f;1oy*dv-pq9 izigi k,) p l/+qrest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one of two wpziq) -zf1v i,;f*dny / gzi)kp9qo+ lays 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.