97.01: A force F directed at an angle of θ abosk9(zu 4zg4ic., va abve the horizontal is used to pull a crate a distancec4vb4z9 ais z(.k,aug D across a level floor. The work done by the force F is

  97.33: A softball player 54rd * hj2k+q 3zynqmbcatches 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 distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand i2 y+ hq3*mkzq5dr 4njbs

  99.14: A construction laborer holds a 20 kilogram*8/ 7/i dm/lno7ngazts oj9yu sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbtog9*/usnj /am7oind y8l7 z/oard?

  17.11: A 5.00 kg y89f6(g n u p huwodmi54na6t/block slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy6uwm go8f4 dayn95(utn i6ph/ 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 onsm.oxa*6v4 (y) ,frfg p:z5fmvsti l3 a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fma)*,5(srfvx 3fs om lt z:.gpy46ivfrom 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 exex7 4 :-lgsmrkorted on a 3.0 kg block for 5.0 s. The block was initially ar7mk-4:xo gls t 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 forcih :p53lyem; me directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest andyem: m;5plih3 slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student init) tko)xtqiy qi5 y58o)ially 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. Which of the fyiq) k tio )to58q)x5yollowing correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic eehim gex uskq 1/-+25yduoo-w.8 q 0gxnergy. An hour after the fan has beenx8q x0qo/uoh+2wdey1-g -s imge k 5.u 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 iuxsmqvip0u+463uc8l ,crp 7 position of 3.0 m, a speed of 4.0 m/s, and an acce7m0 4qic+3uvp lr8pisx cu ,6uleration 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 1.3 m fro5k+i +tsr jc2g7i1z fom the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floo+1or it5+k z 7ijgf2scr, 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 w1i aac)d 2ulvh:::kvfatts (about 32 horsepower) of power 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 thevk fal diu :2::hca)1v car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at v n*f a(;1olcfthe bottom offoa(v*cn1 ;lf 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.
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 btpy-s.skr82sn j8 vg b2,-wapottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the inj2b 8sgtwspakr-,vy-. nps8 2cline 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 stazeiudlxau3x**s,o n6ur2u kg a9*4 v3 rting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, wh36x4druizknu*lau*2 s9vg3 oaex* u, at is its speed in terms of B?

  12.07: What is the net force acting on the object during the time interval of:c*+jyj v ;a ,jhvk7hi the accelv*aj+;h,7j k vihjy:ceration?

  12.08: Through what distancv, /wgmy:9tt ge does the object move during the time interval of the acceler yvw g/ttgm,:9ation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fsows.saj4) 4q2gz 4iz rom 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 this time intes4azw o24sg4ij). szqrval?

  14.11: A crate gains 36.0 J of kinetic energy while its wh0b .;ciwu 3a(ssmi.speed is increased from 2.00m/s hbwi;.w(3ssui.am0 c to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horig ;uqgixco w/1g99b*0f *vixdzontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficientvb9i;xg 0uxd / q*1ic*wgf9go 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 b(*bkus s8x9v yyv5n 2output of 0.10 w to raise a block vertically at a 8b2x ky59vys(u b*nv sconstant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objeccz 6d tgv9r1f) idu/l.t is released from rest 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 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 og f c/d9.dz1tvi) r6ulbject during the fall?

  96.18: A rubber ball is held motionless a height ho above lgs )nm:27,v1y*zic2nx6 l8rbnti aca hard 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 ener1a 2b:i* snl)cz6gxc2 ,ylrm7 v8nitngy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The drive.h6u;) uk+frr pp- yzlr sees a barrier ahead. If the car takes 95 meters to come to rest, what prf) lyz;phu6+k-.ru 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 uniform49z)1fhro rp ely until it stops. If the o rp19h zer)f4ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts oydlsyovf,-+t5n 7ie6zbm/+of8a m2 i f different masses but identical kinetic energies and the three following statements. Whi+si6fnyy5+m dm ov otb/28, ailez-7fch 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-kgballjmh:a, deej)b.k 5 8fph a)ni0 of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignjfaa e5.)ehjn8p0: hdmik), boring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straightyc q):.ol ce+0 *jhvhu:kix fy,/k6qp 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 forc+6,/k p.j :v* kq0 clfe)oqyh:hc xuyie 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+jfpiq qa ,00,n 9imi y6zera1 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 neglr91a,aqyf in i0qj 60z,i me+pigible, 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 . oldxf3 l7jh:uv4 +)bbeyzs6above 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 wa4:zlbo.e7d+y h j xfbs v)3u6ls 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 bq0rr(go 48p b9xqu:nuntil the cord 4rgpbx:8r( u oqqb90 nmakes 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 uniform incline of unknown angle. The sled, whicolmzh0ut vv9.n .n7tx .pt,1qyxm k;.h 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 originavlty. mx 7,n.k 0o.1th.mq9uzntvx; pl position at the bottom of the hill?

  06.09: A deliveryman moves 10 carton//7vx8 ojyfg) lxv:oids,)h cs from the sidewalk, along 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 ch,g)x:8j/vy xo )vdsi7l /of 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 gf)x) qp-t-g kk jkfzas9n./7 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which x- .s k)kg7fja-)npg z9qktf/one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling baliyx x3nbw0* te9t *y2 s/jxsh:ls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. Afxy3 s*9 xt/*0sb:ehtni2x ywjter 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 object of mass M straigh/cktwg6ymcx,iq(7 . gt upward with an initial non-zero speed v. The object rises to a maximum height H above thxiqc,wmk. gyt6g/c7( e 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 adxucq ninvp,jimzh8-25 819 n spring that has a spring constant of 20 N/m. The po1q2 jn985 pnmz,udxh -iv 8cnitential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. W gh*sz+ezz2wn7n 4l u:hat is the maximum speed it can impa+ zwn2e:z 7z hl*ngus4rt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixe;ztl5 aoi)oqr8 x7y ,qd 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 comx otoq ,z5y)iq 7r;8lapare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.