97.01: A force F directed at an angle of θ above the hor 7uhi -gsfk:r6-*pcc fizontal is used to pull a crate a i f p*kc :r7-ghuf6-csdistance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towa)ls hye /n3 hozcp5v*(rd her with horizontal speed v. While bringing the ball to rest, her hand moves back a dist)l3yz v(nse*h c/hp o5anced. 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 meter a8y7v 3idbrj xxq:l 20sbove the floor for 4 seconds. During these 4 secondshow much power was expended l73 r sx2v0ib qjy8d:xon the wallboard?

  17.11: A 5.00 kg block slides with uniform accw ky8x6 bob 2bgvvsap/+/9u b7eleration on a horizontal surfacxs vua b /g2 w96+yvp8b/ob7bke for 5.00 s. The block’s kinetic 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 acceleration on a horizontal nvh(d;mmmm b72j ;ip4surface fmm(; m7d vnpi;hj4bm2or 5.00 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 a 3.0 kgvm 4qo:rh :g.s block for 5.0 s. The block was initially at rest and slides on a horizontal surfah.::svg m4orqce.
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 t)5p9ejq4if oar+-jqa 3.0 kg block for 5.0 s. T re)i95faq qp -+4jtojhe 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 initsyr;u hz, ,zd8orf7:c5 g6uxyially at reston a frictionless frozen pond throws 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. Whiycszrxr z5 ,uf8; y76udgh :o,ch of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. A:zwb 0/ achek.n hour after the fan has :bhzwka0c /. ebeen 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 spc;+. 8npj7n4bhemu vleed of 4.0 m/s, and an accecb hn8mn+e;pv.lj u4 7leration 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 i-- h/1wk ymmibn the bookroom 1.3 m from the floor. If the janitor relo ybmmwi-/k 1-hcates 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 delq x eqpeo5;8a5mq2e)kivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car main e5 )kq8eqx2mep5;oaqtains 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 figurek7q /m6,wrwmt to 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 pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg,,q6 mwktwr7 /m 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 with8boz*n(:,paj;my wfnr3gr o .j;haq 8 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 g*oaqn8wp3azj(rfjym;b ,8nr. o h;:, 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 froz mopvlhm. nq9+)()our hx08uaq) z(om rest, along a straight road. CarA has n hm.qh(oorlxou)v)pmu+ 9aq)z(08ztwice 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 thelmk duhm6c+ ,uu:1uv9 +8dh 4 edeqx+m object during the time interval of the ac98v6md 1mcm d+ lh4qe+uudu+, ue:xkhceleration?

  12.08: Through what distance does t3qi, q;i:era 8arq.; r/+nm/u cejdszhe object move during the time interval of tha n :errezdri83q,mc uqj +;a. i//;qse acceleration

  12.19: The magnitude of the linear momentum u,n le/g0mc*ju.4qx dof a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is4 u*,jgndcx/.0e mlqu the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0d(q8 ofj9 x.en J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents th df.9qenxj(8 oe mass of the crate

  94.38: A force F at a73z bagq 6: 0eaizcm8y,paky(n angle θ above the horizontal is used to pull a heavy suitcase of weight miy6 z zbapm7kq ae ,08:y(ca3gga 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 exerf)b96 odnkcd;3gu z1uts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raizd 3 6cfb;o9ugu1)ndk se a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the E s daon7x*;7 nbld3h.karth, 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 groundn; .dln*sak3 dh7b7x o, 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 above a haml*to0zq)m9sb*4 smn+ y)icmrd floor and released. Assuming that the 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 abo*t9lm o)s4)*sbn mmyczqim + 0ve the surface?

  07.06: A 500-kg car is moving at 28 m/s. Thezjjj 9 rv-8h (i5v)gpe driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum aver jhpvir98)(jv zg 5j-eage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformlbg7(-oz*jm*qz irla 7y until it stops. If the ball travels 15 meters, what was the average net force appli(lz*-gbo q*i7m jzar7ed while it was coming to a stop?

  02.26: Consider two laboratory carts of diffef1sd)h) f d5z;omrd-t o wlv9g(m57d krent masses but identical kinetic energies and the three following statements. Which of the above statements would be correct?fr m tdzhmd9vfd - (kg)17s)l;oo5 w5d
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 cla(e3oq8ug es/hov0ws k-0a /ujsz7az4 y is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air reso(4ksvagjaoz0 /he3s- wuu/ 8e7zq 0sistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sui -v8cw24p4 3rlzkzmbh37kkdu;b f m )rface. 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) between the boy’ s feet and the concrete dovw7zrkhf m-3cdkp4b;i4 23zbkm8)l u on the boy?

  02.48: An object of mass M is dropped *6pn v8tp1t8je + ibgsp 32vpbfrom 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 c+tg6bpvv3pt np1psi288be* j onstant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped froq,pl8 )( bd-e ulhk9ccm aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time -qbc)(lcdhl9p ku 8 e,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 bob mass mon a cord length L is p4ohamc0csag ;5pn, , qulled sideways until the cord makes anco4a;q cm5n, ahps,g0 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 sledex-xt-1co jm, w+ a;f agy;jb/:mdhh+)w h4qt, 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 t4xc-tt;g+xjh,m +d eqa)hw h 1 /;yj-amfbw:oo 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, aloyy(:i lyja eh 3/jr+0dng 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 donejah+3y yyi:j0d l/er( by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the fig9w.+u wzgb-ybure) is applied for the 6.0 metebg.y uzw+ -b9wr 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 from rest from nrlhn0 i52zw* tgfu ;e,*f9xw the top of a tall tower. Ball A is dropped one second before ball B5*2w0nlef z,9 ni*hrg;xu wft. 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 j7la9r5;i:5 celvvxqobject 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 9 vc5:l7xq ei;av 5jrlmass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretir9f6+ kg w2 .tsxy5nqches a spring that has a spring constant of 20 N/m. The potential energy stored in t gw 5sfqnk6x+ 92y.irthe spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum pt :cv),m9y c cc+4pn6jz r5rbspeed it can impart tot4p rz5) nb ,cycrj9 pmc:6v+c a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest aq(v)sgf-3p4vlusjm-nkn 9s 1t 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 wor uk 3jqf v9s(pvl-1gns 4ns)-mk 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.