97.01: A force F directed at an angle of θ above the horizontal is y ,pnp7fz o(tty(2bv4used to pull a crate a df27tpb(4z p,v t(o yynistance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, xldn 7 :klg/).ihlzz: which is moving toward her with horizontal 7.zi nllkx)lh: z/d:gspeed 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 is

  99.14: A construction laborer holds a 20 kilogram sheet of wallbo2ni krmgm)1; hh23 ;jbkr2wsward 3 meter above the floor for 4 seconds. During these 4 secondshow muc;m2;rws3w) h2k ibkrnh 21mgjh power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizo;u: le xy-rc2zntal surface for 5.00 s2 y-ec uz;:lxr. The block’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 block slides with uniform js5*.+8w ba/ 0kguj1 eptfdbc acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrease g j+pf*jabweu d/.8cst1 b0k5s 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 is exerted on a 3.0 kg block forg3ujci4h e 58)fk)fu d 5.0 s. Thediug) uf4 ej5c3)k8 fh 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 3.2 qdd+q74)t lb h6g8y0xv nogf0 kg block for 5 4f0xdyv7+g dgq tbn2o6q)8l h.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 frozen pond throws a 1 8nm+0 fcnwwdpg( h/el23g t2skg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in 2hdpmnts ew0nc 83/(wfg + 2glthe other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic enk9k0 x)gy a0u5u a*wkiergy. An hour after the fan has been turned off*90u iw 5yagk) kuax0k,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, a sper;x 3jz4jpj d0ed of 4.0 z 3;r04 jpxdjjm/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 is on the middle shelf in the bookroom 1.3 m fronnp.m 3c7oqqf +fmn j)s(i*7sm the floor. If the janitor relocates the boxic o .q7nf mss+q* jn3)f(mnp7 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) ocbw5uktrdk kw .;*51v f power to a car's driving wheels. If the car mv cw55;u wkb* 1t.rdkkaintains 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 5.0ywhxi7 ot+;27yu3ae8 bopc7u-dq qf/ 6m*vak0 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 lef7qeuvbkhaw2t*p/ocm yoi-u 3q af78y+7x6d ;t 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 rfv;7c hv+xk n0ight, a box moves 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 tc f;0kv7hx+ vno 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 starting from rek.psbr ;g g 5s0gy i7ws84-b j6z3xqj7p: bjyest, along a straight road. CarA has twice the acceleration oz653j;epps sx- ig y4gk7rbybq7sjw .0 :jg8 bf 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 acting on .lyb8r )d;qurvy3 7cg.cylq4qw h56 othe object during the time interval of the accelera5 q)..hrl6bvqyo8c3y;cld y u rgq4w7tion?

  12.08: Through what distance hw(uu+kwg-op,vt 0u62 pfe +l does the object move during the time interval of the acceleratohk++pg-eu fv u6wwp0l,u(2 tion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fqip a6u,axj/,wi ijd.k* 1vz-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 interval?w1p,,ivaz kxi. a-u/q 6*dji j

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased fxc6 z++hee3xy9)rv tfezb 8k+ qa.*b from 2.00m/s to 4.00m/s. Which one of the following choices b*b+ec+ fz9ta8hfv .) 3ekx+ey qz6r bxest represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull +4x8 bbi 2nx.i- .u sedt lqixzmjs*il-;-,in a heavy suitmb;i4 -q ixizl-u2dn x 8,-i xtbe.l* .s+insjcase 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 force is:

  14.31: A toy crane exerts an upwarb cs8-9m rj)vkd force and delivers a useful power output of 0.10 w to raise a block vertically at a constant spe -vc8 m9)srjbked. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from 3.fv8 hb sys;q jqz42irest 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 bbhsv i4yf3z28qs ;.j qy the 1.00 kg object during the fall?

  96.18: A rubber ball is held moti79acjixa( j 42 i2uh/fluxz0lonless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, whici fhl2aaj4jix0 7ul9c/( uzx2h one of the following 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/ie,m77 tp--nkhf d+eds. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force7 ,m-+fdp 7idkenhte- necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformlyls6+ **,nsvfddlvnrol p- 2:e until it stops. If the ball travels 15 metnnf*rep:v, l6l ld-vod*+ s2s ers, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mix i1yz9b */xjca+k)easses but identical kinetic energies and the three following statements. Which of the above stat/e9i b *xyzj+k1ixa)c ements 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 tosa(i0yrm;jmg() h3jr b sed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whaa(jryr 0mibg; mh(j3)t is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upw05 nlwzyv*yn :v 85uirard 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 force of contact (N) between the boy’ s feet and the concrete do on the n y80nl5ry:i wvz u5v*boy?

  02.48: An object of mass M is dropped from aheightH above:x;i n4/ijdk w 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, whatjw:;d/ki xi4 n 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 gt)pedoq w*0wb 8g ,2kd :5*wv jocpbn+round. The object bounces off of a horizontal surface in a collision lasting time T. The object then g:+o*2ptvopw,qn bd) c *8w5jkd b0ewrises 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 pullejz:lom 4x;pqcy8 p+lhn3 g;br + .zmh8d sideways until the cord makes an an;.glypj; 8+n rl 34p cq8hm:mxz+zhobgle
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 frvq 05r52ijyunknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3i 2yvjfr5 5rq0.30 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 mo pthbtokm i;uu++, (eh:mh0*mves 10 cartons 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 done by the *hteo ,u:m 0u;bk+hm +mt(pih deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is app1a hgqix/kd; gf+ r2y:w hu7:vlied 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 the following choices best represents the work done gy/;: vrxka+qw721 guhd:ifhby the force F onthe box for the motion?

  04.48: Two identical bowling bgr7(c nmzq)14kpjs nr8j * )gqalls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second b 7p rjcq*skm)qjggnz18)4( nrefore ball B. After 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 throskv s,bnc ;a5m:08/w/ kwh ozlws an object of 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 thsc /n:z hkswlv; /wba0k,om85rows 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 a spring that has a spring constant of 20 N/m.nr8e2/ira/ lv The potential energy stored in t28vlera nr i//he spring is:

  97.10: A compressed spring has 16 J of potzy4,g v*w2bws /dr:dmbax4e5x dr:)t ential energy. What is the maximum speed it can impart to a 2.0-kg )5b:ebtw4m :d y2/rs, z4g ddaxrvx*w object ?

  

  10.31: An object of mas 5vz o6cp9wpb:-r sdo:p y2p4iatnc 0;s M starts from 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? Ayn49w:ia5 : ;ppocvrc2p obst06zpd-ssume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.