97.01: A force F directed at an angle of θ above the horizontal is q 7ni6b0zk y/k dfi(19:hzrco used to pull a crate a distance D across a level floor. The work done by the foo bc /z7z0h1f :q(k6 ri9dknyirce F is

  97.33: A softball player catches a ball of mass m, which3b*79nmc wg5m.gov5a s+d ko d 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 tho5k gd*bc v9d3sm75.w o+man ge ball by her hand is

  99.14: A construction laborer holdsc2(j z nqtj1 pbixf 9lgf::g9) a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboaqjjnf9(fci: :l p2z bgx19gt) rd?

  17.11: A 5.00 kg block slides with uniform accelera8a2wx:jzpq c 3 qm+g3ftion on a horizontal surface for 5.00 s. The :328awz3qcq x +gmp fjblock’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 blxq4k p5uy7i 0xv09ysyock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J tkx 4qy5y7psuiy 0x0 v9o 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 8layu*ddl6 ( agb0hz3directed to the right is exerted on a 3.0 kg block for 5.0 s. The bl(lulbz3ad h08*dg6 ya ock 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 dir)peg p50 :; uo2tyunk1e0zju tected 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 surfaceju1u)p50kgtetpo0z n u;:y2e.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiallgaad4eb+ atl( mv. tl55fk9 k:y 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 directg:a5fb+ e (k5a4altv.mdlt 9 kion. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kiv e4aa cej3d,osxhp:(git li2 5z-9z4netic energy. An hour after the fan has been tcl5 s3 -zaita4xod4g: pei9(v2ez jh, urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kgxd10b1 hwi9e;+y4duz3nz gvj has a position of 3.0 m, a speed of 4.0 m/s, and an acceld 4gzvedy1w3 ;+b zji9 ux1n0heration 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 m h+5dw 2cjy;emiddle shelf in the bookroom 1.3 m from the 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 b5 +j2ycemw;hdox. The box has a mass of 10.0 kg.

  02.32: An automobile engine delj+u lk;-dy)u(a kvri5 ivers 24,000 watts (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 t(v au+d5y k;rkl) -ujihe retarding force acting on the car?

  09.13: In the figure to the ri ly tvh6*.gglg10,ykjght, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. Theg1 lj6 yglt vh.0k,gy* 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 th9a )nm + u0wrgzr8hhw6e 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 nh)8wr ma9+w 60hgrzuof 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, eachnl:q .f* tkf1. z y7+voyox;bl starting 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 distan1.bnqt.f*f v ;llxzo:y7oy + kce F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time interva ( ol3k*p(iinmlqt/*dl of t/mltkoi q*d(p(*n3li he acceleration?

  12.08: Through what distance does the object move during t f,:h+ssx fkke)8l7dy he time interval of the ed),lyshf 8f+ kxks :7acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chav4 6wudg/t u9 d6g;hdfnged 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 energy of the mass during this ;/u6uvd46g dthwgf9dtime interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased -ao3g6vrx:3fl wo mk t25 cs5nfrom 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass w35o-rx3o5g6mtlsa 2 vf:nk cof the crate

  94.38: A force F at an angle θ above the horizontal is used to cd4b4 1rgt6rhkql): hpull a heavy suitcase of weight mga 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 forq6rr1gl c h4h )4kt:bdce is:

  14.31: A toy crane exerts an upward force and delivers a usefu wrgd2p;oq) 2qsos6o,q kkh10 s.ng .sl power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed w2gq6hrso 20k,sq ksg.o. wnq; dps1o)ill this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object 1l5 5xu ; w.l+mnzsnz 4pw/mygis 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 c;/gm.nzp4 z1nslwx5 yu5lm w+hoices 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 a3p6k v6qyv m-fwdc i78x)5stbnd released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationshc65 36s twqmv8dikxp7 b)-fyvip 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 driverww /0lvv+w+ g )h/4qms6cbtfx sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averages/x/h+0 +wmvf t6bcw4 vgl) wq net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slou0);a yy(*sdkv (rrys ws down uniformly until it stops. If the ball travels 15 meters, whasr d y;(v0kr()*yyuast was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massest: qouo- pj *bf*0k-+u m(nncl but identical kinetic energies and the three following statements. Which of the above statementsncm*o*ofuk pu:j- +-bqlt 0(n 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 ve a4w uj/b2w5qzrtically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whawbu z2q5aw4 /jt 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 fy ch,k dzvyhu3) j3*7ym.tq: surface. The boy, of mass M, leaves the concrete surface 7*j,kmq. y)cv df:ty3hzyh3u 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 fron7* kw b9 uya+d8n2dskm 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, ku n w7*nb8+2d9y dakswhat 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 above the ground. The o* bqrwjk /fga oz7e-,lpd:q: 5bject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum r* dlj,-:qz7 e/:pwq a5kbogfheight 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 9 6afd wiea-ow*tg:9/e xe 0f8ijc ij0mon a cord length L is pulled sideways until the cord jao:cijt-f 8 we exedwfi9 g006a/*9imakes 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 unifx yrwm+dv4l58orm incline of unknown angle. The sled, which started at the bottom of l dx5r8m+vw4y 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 position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-mp kf-vh 2gww64eter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carg-pw24k wvfh6 ton 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 fivl:;6j )e( k.fgtryjr gure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of :jj l;y6).g kr(ftrv ethe 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 drta02 )s dutxze,qo/b)opped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but bt0, )a/u2xe osbtqz)d efore 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 straigjl0ctpi, 0n 2ptg))cwc lox05ht 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 0.5w5tt0 g ,xpli cncj0c 2)0o)plM 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 a spring that has a spring constant of 20 rke1b n7nl( 4cgzmbcc6;f9pirkt84 ;N/m. Th9c c7;kibr4(t1 n be;84c6z flnpgmrke potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential enemsh9,xa79trkq )o n 3ergy. What is the maximum speed it t9xem)7a ,nosqh39krcan impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a 5 qnsjx 33x f75bnm-tpxdaurj:7x 4(cfixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force showx:rpj3fd (ns7 xmq4jx55abn3ct7x- u n 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.