97.01: A force F directed at an angle of θ above the horizontal is usim4we41xd e* 1uueo; ued to pull a crate a distance D across a level floor. T ;x eeuomw41u *u4de1ihe work done by the force F is

  97.33: A softball player catche,m.pz)*+ +vs: dq; g9ugl,bh pudziffs 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. Assumin;q, dl:)pi. s u dmhg*f+vzf+pg,zu9bg 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 m2xovbhqm :.-qeter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wh: m- .x2qvqoballboard?

  17.11: A 5.00 kg block slides with 9 -c9k)f u1uny3nrw0ra5v hmpuniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decr) rf9n03vp9 un1yakc 5u-h mrweases 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 uniform2.elg9ru h0du8ie l5e acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 2iuerllheg5d80e .9u50.0 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 kg bfqn+bqzey. /pbd 7(74py5l mglock for 5.0 s. The block was initially at rest and slides on a hore/n7(pz+.q dy ympq bbfgl457 izontal 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 ed+hvpvu7on eb+6d hj4-k; i5 te*-ztzxerted on a 3.0 kg block for 5.0 s. The bl6*uz;tk -n+dh e ptdoe-+i5v7j4bvh zock 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 frozen pond throws a 1 kgvl(s/wixvz:ivb m ,09 hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off ins ,vv z(/m 0w:livxi9b the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour af++y/y -;w99 :ohy1y9 f agvjbpeawoc *ied7lqter the fan has been turned oywhg/+bl7qoaj 1e9yi9ayo ;: cp wvef9+d* y- ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg ha 0gkmh-iw o5 yjfoa/kg13)ig(s a position of 3.0 m, a speed of 4.0 m/s, and an accefi3kmi ah51-g jwy/ o0ko gg()leration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is o e1*db( ote: qu7ew9hwn the middle shelf in the bookroom 1.3 m from the fl1:(oet *ww7q 9dbe euhoor. 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 box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wa3vk+ ,ugsyx +e60wf qibh1wc.tts (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 + cuwiw.+fbk sx ,gh ey061qv3is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5cikx75r 3nab6t/2x mszlelpd 5 66u;c.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 forc;3pk6an5ulctr5s e 7zb xi6m d /62clxe 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 aq,h-r g(khf/3k 5hoho*vevie9 s8 ,eok u5z(s t the bottom of a rough, fixed inclined plane. Tzske/g*s u5kf voo r(k i vqh,o983hh(he5,e-he 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, 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, ea;( ibod 74qk jhukf)jduac;m l7q8/)pch starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A hashak)dd ;)ip mjb7u l(oq7/j4ku; 8c qf 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 the object during the time intervhe14 p 4mklr 6r 9bxi.*5ehnnqal of the acceleratixhlhe9.e6m4 b* q r14knr5nipon?

  12.08: Through what d0e81 cteim ea2istance does the object move during the time interval of the accelerati8cm1itee e2 0aon

  12.19: The magnitude of the linear momentum of a 4.00 kg pointgcd1hj r(w9cjrbjop34mwqyg)y0-/ 6hy j2( n 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 energy of the mass during thi prbjjw1r nj6ow gm-d3j(2c9gyq y(y 0h) 4/hcs time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is inm kh ma/5:.hzt ) dj mmi;4bv0i,suez5) l(knmcreased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crae4t k.5a5mh;m)bi)u :h,mvmdm zk (/0 lnzsj ite

  94.38: A force F at an angle θ above the horizontad)4p5l, 8jjc )se vzx ysp7:dlbo4/u dl is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient cj,4/dy8 jp:bz5d4s le)vs7opd lu)xof 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 forcet2,se4 . eip.huvp7 cz 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 cricph pz. ,evuet4 27.sane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Ea ip8s )jwro3oxzeams;w*6/tbk6r *k s 13hj0qrth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J o js;iw krk3asw /6 *p )o8hq3smzt1o0re*b6 jxf 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 ho ht.fh: o8jxu.opl,e qz ,bm6(above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship befh8b mh6 zu. ,.l,otj(qp:eox tween 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 barrier ahead. I;8roj)6lb uxezt b)j(f the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to)8zxbu6(e lj ;bo jtr) stop?

  00.26: A 500-gram ball moving at 5 -igf/u4 sobj15 m/s slows down uniformly until it stops. If the ball traveg u js/o-fbi54ls 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratv-5f v2q- zqqqmk g:)h/bx9jkory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be co9 vgbk5 hv:-k2xqjq-q fq z/)mrrect?
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 tos6gv8wqyy.( 5j32 k8 0 tsbxuwl+uxmb qsed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistanc32gxx80.k8q(sqjum6lby tvwy u5wb+e, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromva:kf r 6g7hlxa;*gp0s bf;-o rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concretg *a-b7op:lsak; 6hf; frgx v0e 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 aheightH above the ge o,r .uzhbl-+d 5)we pof1d4sround. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assumin)oo uez-,r4 slh51 e.wdbdfp+g that air resistance is negligible, 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 m wq3fhhvnd8)md*uzu,e-;wr : ass M is dropped from aheight H above the ground. The object bounce h ;r zdqdfwm-3 u)w8*vehun,:s 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 acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the s,dfpnau z9 o4ud) df-+fj:*d cord makes an *9 -,ddfu+pn:ao f)suzjd fd4angle
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. z fue d;1lh, ay e38)q,u:xvfd The sled, which started at the bottom of the incline movqu8 e3d d1zx,l)e,f;v y:hfuaing 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 mb9f+2ejs s(7rruf6 k 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 done by the deliveryman on the cartons to move them to thek9+6m(r bruse2f7 fsj loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for taft;w) f e7nj:he 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the followi;aj:f7 wtnf)e ng choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling bag lyeo+w9kp-(i q n0 kigep20x r)n)s2lls 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 ball A strikes the ground, how are the mechanical energies of theewg+2(ok-s) ig0x0 q ni2lp kp)9er yn two balls changing?

  11.28: A person throws an object of pl z* sl1/xwz5mass M straight upward with an initial non-zero speed v. The os*pw1 x zllz5/bject 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 resistance.

  96.20: A force of 10 N stretches mmuy9qv3s9t , a spring that has a spring constant of 20 N/m. The potential energy stored in the spring is:vyq9 ,umt93s m

  97.10: A compressed spring has 16 J of potential energy.bq1;0o3 /lulmr xx m8ivv;j5g What is the maximum speed it can impart m5x;vji ; lvul rq3m/180xbgoto a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a p)wdz.a ee(j /nd-, hwfixed incline of height H. A person deci)d ew,hdea -(jz. /wnpdes 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 constant non- zero coefficient of kinetic friction between the incline and the object for both trials.