97.01: A force F directed at an angle of θ above the horizontal is u0,v s/ okrho fgjs9.0och7* hjsed to pull a crate a distance D across a level floor. The work done by o09,s/fhs hk.o jjov 0c*g7h rthe force F is

  97.33: A softball player catches a ball of mass m, wh yxp04rj 3o i/+sk8p/u ixo/ooln8bryf( .8urich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assu4sou388 8ro/o ppx(lxiu/k rynbf0j+ /y oir.ming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructionicao1l s+ 9b)h laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much loa +ic1)hb 9spower was expended on the wallboard?

  17.11: A 5.00 kg block slides wit 7b *vb6dibpo*3psu1kxom- /jh uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from o */7im361kbxoppv -usbbj*d 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 block9qe3e21j+:m l:yuwthaxiu* d slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly dew9+a:i*ym 2: 3ulhdjt1 xque ecreases 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 r pueq/he8g+)gbe;p (directed to the right is exerted on a 3.0 kg block for 5.0 s.;8pr+h be(uq/e)e pg g The block was initially at rest and 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 on a 3.0 kg blocke1 npg.l8-g tm for 5.t1en-g8.pg lm 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 fri.t el2xv 8g6qictionless 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. Which of the following correctly describes the above site6 qx2l8iv.tg uation?

  03.14: A fan blows the air ap+ )wmuf,oy po/das0c* o ;jo8nd gives it kinetic energy. An hour after the fan has been tur8yda/mooc0 p;o *+ upj,)owfsned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, 24nspgd jpqe.7-f; 6ju rwgv,a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelew;jd72p4p. -uj6sefnr qgv,g ration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks 3rr8+ ( k0 q6kpt grb7pfwq,un sc)k9yis on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocateyf+r96 3cqwr0 nqp7),bu8kg tk prsk (s 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 en * vw(lyy(o3cue,m,m ggine delivers 24,000 watts (about 32 horsepower) of power to a car's eol(uv*wc, mmy3, g y(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 car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the booxnsr: f qe8ls y1n1 gb9*v(.nttom of a rough, fixed inclined plane. The box slides with co9( .: l8qgssnnr1 1v fynoeb*xnstant 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.
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 trezp2m/6 46 kqe-z fyjhe 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. The4j6m/2-eyz r pqkez6 f 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, p*r zg60fp*dlylxojd)g w6 9 i(vv+*geach starting from rest, along a straight road. CarA has twicdg0 lr w*jl)6 *ypgdf9px*vvi+6(z og e 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 acting0q livp0mj mg+-7p r6:nvjq8z on the object during the time interval of the acceleration? 6v8jl7 m+0grpp: -q0 jqnimvz

  12.08: Through what distanc4-kn el a ()k.fnonz1hp/hkpr3 8bh9c e does the object move during the time interval of the acceleratak hnnh/rz (.8p39lkh)okbp ec - n4f1ion

  12.19: The magnitude of the linear momentum of a 4.00 kg point maspio4dku( 0 xdg.rwgp/* 94ws zs is changed from 6.00kg.m/s to 14.0kg.m/s in uzx p44o.*/gd0kr9 wpi(gs wd a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36xf o6b 1buep* q4o+f: w(vi0nr.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which f +oor (uqpi0bew: bf* 416vxnone 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 to pull0e pp2( flwys o+7c/gt a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coe0/twp7ecop y2 f(g l+sfficient 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 nw;v83w8 rg;ex2pzgb8-ov vs a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constanvr2 ;e z8bvw-8 vgpsn 8wgo3;xt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rb.k+qbbh m e;2est near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on ; 2bhkb.bme+q 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 above a hard floor and zvrlpd6m-dab9 ,kz)*g-0g csreleased. Assuming that the collision with the floor is elastic, which one of the foldcbrg vp-m0 a69- lks,) dgzz*lowing 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.whj(7 ck)a:a.lsh xt0 The driver sees a barrier ahead. If the car takes 95 meters to cj 7a)(wha 0.cxlt:hks ome 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 until eoxluj:ka4 - nk7tg .6m/l5hq it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?n6jl5ug7k-:4 mk lae./q oh tx

  02.26: Consider two laboratory carts of different masses but identical kinetic 53xbqcyat ku4jag 1 );energies and the three folloabc;3 y1 )qtx gu5j4akwing 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 air with an initial spyh alwoyqf/fl6 x*f2i6:* b t1eed of 4.60 m/s. Ignoring air resistance, what is thebw6*yqolfx6fyl a 12:/fth* i change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, sta;:prhqebr ej. ) g3on;tionary concrete surface. The boypego ; qbh:;)3.ejrr n, 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 do on the boy?

  02.48: An object of mass M is dropped from aheigh .jw +wbgyi kkvw+:o1-tH 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 conwo+j1 -vgwy:k+w. bki stant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is d-8ashkf-qwdtko:+ag a3z tjv)8nbo ewz-28/ropped from aheight H above the ground. The object bounces off of a horizontal surface in ) akvw2qsa-ge8: -+jbo 8t nkt/zof3whaz- 8da 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 bob mass mon a6hyj 2*/yo lhzu f47wo cord length L is pulled sideways until the cord makes an angle uohylh / y7642 zow*fj
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 upkae(owrnx/g 3)s3 4oz 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 original positez oor3n 3xk)4sawg/( ion at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a f4tb nau.brk2 b6(1jy10-meter ramp to a loading dock, which is 1.5 meters above2t .6jbbkuy1rf b a(4n the 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=50N (as shown in the figure) is applied for the 6.0 2zc; gm:kqbsb61dpp )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 reprb2s6qm )c1pgz dbk :;pesents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling ballsf3f ciat5r ; y3)9phds 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 ball B is dropped but before ba5pfs id 39yfc )3h;rtall 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 initiawrg3f 2y)q1r;t pwr *ul 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 ;r)r1 wwg2t yr3pq*ufof 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 spring constanq ti,3yzc faw6ng gh9q; p;x03t of 20 N/m. Th, wgcq;t fg;9zq330 aiyn6hxpe potential energy stored in the spring is:

  97.10: A compressed sprin8x *n0-bjtmn 7 udwt l-ddr-)hg has 16 J of potential energy. What is the maximum spee hn-xuldj -d*-n7bwtr08)mdtd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts fromfvov yd; g;2);pqqdz(thsq/ 6 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 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 constantzh o fg/; pv6;qqt sv)2ydqd(; non- zero coefficient of kinetic friction between the incline and the object for both trials.