97.01: A force F directed at an anglelasjb(.ve+ i;9/* deh 8f 6jn;uu mamu of θ above the horizontal is used to pull a crate a distance D across a level floor. Thlmdnfuv9h b a*iu; /m u; .+jea(8js6ee work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her zyb7ge5n*xc 6with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, *5e7zncb6 gyxthe horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram s*v vrhsx ihk0/xe,s+*heet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboar0r+**kh,h sx vx es/ivd?

  17.11: A 5.00 kg block slides withes6x 6k9 sb6;g2 zmlet uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thisk em2e6 6sxbs zt;l69g time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides mt4 hilfee2r88 ac2 m3with uniform acceleration on a horizontal surlaem2 c8 f 2r4ehimt83face for 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 af q b/ jzd27nc4p9ip7y mx(a+is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest aidn7xpzq74mp/ jf(b2 aca+y9 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 right is exerted oaw2sp : jmh eex73(0wkn a 3.0 kg block for 5ejww(3hk:2asep0 xm 7 .0 s. The 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 froz0fg:i ic60 jtaen pond throws a 1 kg hammer in one di ai0t6g0: cjfirection. 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 air and gives 2b)zexx uy:ml +k5as6j1 dj6rit kinetic energy. An hour after the fan has been tbzxjur6+dm: sx2 )e516kjaly urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, an 6iczs3/j0t w6l4sbwtph + i l0oq1b4 block of mass 0.50 kg has a position of 3.0 m, a speed of 4.06osbql04i1p s4 c0ttj6 h/3bi zlnw+w m/s, and 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 iv +5r7(p;zbzjzm okr1s on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relo57zrrzzmv+p( k 1b j;ocates 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 poyyx9 ec17pencg d:24obyz eif:u.5i )wer to a car's driving wheels. If the car maintains a constant speed of 30 m/s pied4x yyb2 zo gf:c1 )euncy9:.5ei7 (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the5b/u )gq gxxx4 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 4 u)/xggqx5b xof 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 movel8t5 xvv ym3b c1s6)22oxols qs 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, 2vsx bmoosxl8)t265vy3lcq1of 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 from rest, along a straiyic w3,/e 4ycy81huuc8,o bkwkj ps.9cn )ed8 ght road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B hay kcyh8 cnko8sc)4 uwe8.,9e/cj wy3d1,bpuis 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 thei:o4 5qpz+e7oai. lon time interval of the accela+plio z7qin:.o54 eoeration?

  12.08: Through what distance j8 mlw,m2bsn+ does the object move during the time interval of the accelej2nsl bm, w+m8ration

  12.19: The magnitude of the linear momentum of a 4.00 kg pr2 c ii/a u5ipjbf y-86rov;f,oint 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 ua;fvi/,yoc8b fri - 25 rjp6ienergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its sp( gp jde-cxl36sbgmt2( g20nweed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repre6pgwx3b(gtjm0c -sd 2g l2(n esents the mass of the crate

  94.38: A force F at an angle θ m/. wumzx;vw 2above 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 suiu2v; x/mmzww. tcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upubv6(em: 7n .jf s+olpward 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 crs76(p:e. m ovlb+ nufjane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface oo3n7lff4w,o,eu 3ft if the Earth, the gravitational force acting on the ,o7twio3 fulf4n,f e31.00 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 hol*fr +bpwa) j- above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the followia)l*+ bfr-jwpng 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 barrieh-nhn6 a1txhxva , )/vr ahead. If the car takes 95 meters to come txnth/an6a),x -v1hh vo 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 until it stopkafi (:.dyj ) q96xcdds. If the ball travels 15 meters, what was the average net force applied while it wasxfc) d :k.yiqd a96dj( coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinets:0djvj(lei-td+ mr9)tym g:ic energies and the three following statements. Which of d()slerymjdm:i0t 9jtg +-:v 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 o5cn 0 kir i7,y89i;z yug.laxwith an initial speed of 4.60 m/s. 7 zii, 0yyk5c.gal8o rxu; 9inIgnoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromg-6bepgv )94xgp dvt- rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete t g9gvb4g--vdxe)p p6surface 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 fr/c; nj1cpvj7m h1x1w rom 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 the ground o 1m1;pj nx v/jwccr71hn the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H abo8;0:ei ry)gqvh ew;du ve the ground. The object bounces off of a horizontal surface 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 actqe);gw ier 8:y; du0hving on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until txqlflh::p( fei(f6)mhe cord makes an anglep( :(:ex)iffh lqf l6m
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 sled, ( q3xu9d pxi4 ;gfw/xw 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 ix dwq ;x4xg p3uw9(if/ts original position at the bottom of the hill?

  06.09: A deliveryman moves 10 c6 am)hacd,ij,uw x(7j artons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carto,uia wxj)7(m6haj d c,n 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=50N (as shown in the figure) is r85y/ ev l *38fbiufzgapplied for the 6.0 meter motion of theu3iz 58 lfr*/ ef8ybgv 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 re ;rteg)-o9lpkst from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how arer tp;gok)- el9 the mechanical energies of the two balls changing?

  11.28: A person throws an object y 5qk+8.su-5m i x2mdzzt d:hzof 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 0.5M rise above the launch point? Ignore air resista5mu82zd.h5qzds-m:ztx kiy +nce.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20yx0 6.:ohlxnl N/m. The potential e6ynolx x l.h:0nergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wa-(2ge ,agiw /que.i;3sldxnhat is the maximum speed it can impart to a 2.0-kwl.dg i3eqeu 2 n/(s,;xga-iag object ?

  

  10.31: An object of mass M starts from r*fu7 l/-yget9heb i-aest 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 withahi- lfeb eu/-y g97*t 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.