97.01: A force F directed at an angle of θ above the horvd .i. 5hsfq0gizontal is used to pull a crate a distance D across a level floor. The work done by the force0i. fhv.q5sg d F is

  97.33: A softball player catches a ball 9a0uw9ga yc4g ls z1g,of mass m, which is moving toward her with horizontal speez ,a0uw91 lasg49 ygcgd 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 labotid p(.hhz+)*rtpx: c rer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power wt+(piph)rhx .d *c:ztas expended on the wallboard?

  17.11: A 5.00 kg block : cjge(uol(ro ) v-/jx slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in t( gu)( lo/cojev-xr :jhis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a hk, )(iaxld fd+e) lvt7orizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5 x,te(fd)i)k7v+dall0.0 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 eoso dc2ggkkc i, y1e;9z(m)fs d4:fm )ukkx-:xerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sf-( g: ox2 :mku)e ykomcg9 skz,kdc ;fdi41)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 eyi /k he/l :ad+6puxe:xerted on a 3.0 kg block for 5./l/ p:xkeed uh6a+iy: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 resf:ddd n*i.x29zc 2 wek2a6t mp9 qvb*wton 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 following correctly describes the wikpe z99*w d2*6abd2cqmv: fd2nxt. above situation?

  03.14: A fan blows the air and gives it kinetic energy. g:m-1sq e,saod*u 3got odw: 1f. 4ffz An hour after the fan has been wmadf fto4f31 ,e*:g- zo.u dog1qs:s 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 position of 3::ss3m)i :iv6qcdxs vx/fya -.0 m, a speed ocss:/d:vfs-qma ii :xx 6v) y3f 4.0 m/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 bookrlv(r sea2 f) kjzpl.f/i m589room 1.3 m from the sr8lp.9mr(lz) kif/f jv2ea5 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 box. The box has a mass of 10.0 kg.

  02.32: An automobile engine j p8xmez25d lk dg t8nm./7k)pb8u d;odelivers 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 the retarding force actink dtm/8jdmp.2 dl z885) nobk 7xug;peg on the car?

  09.13: In the figure to the right, a box moves with speed 5.00(c gcy8(vw5gg m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as g8cy(v wggc( 5it 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 u(ss 5o1kug 0oubsg vndh(7 5+right, 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 issu( (7 +houndo5ubks50sggv1 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 xk cvelmaqyx6 (,+h:/nd j84tstarting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car qyek t/x 64xcdva8 h, j+(mln: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 ajvf,kf ,r4 8ftcting on the object during the time interval of the acceleratjf 8,k4f,vr ftion?

  12.08: Through what distancefzi krq 1g( xnreqe;szo: d /0ao79k43 does the object move during the time interval of the ac gnid:fr4 7 9sqoo30;rz1e x/a zq(kekceleration

  12.19: The magnitude of the alfkb+5npa - u.c- ab1uf,pm.linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/sfku,5.f appcln amu-.a+1 -b b in 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 36.0 J of kinetic energy while its speed is increased rstwd+4y xf9so8 g -mh*j99j-xu/eewf 8 f g4pfrom 2.00m/s to 4.00m/s. 89* 948f9mft fr-wh /xgg p4e +-jdeyx osuwjsWhich one of the following choices best represents the mass of the crate

  94.38: A force F at an m2 uwi knk)j6)angle θ above the horizontal is used to pull 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 bnu)wkkji2 m)6 y the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a h*9ws dvr9*)jv z)aspuseful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raisdz* j*w v9)sar9psv )he a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth;chxpvv6wz -ogb3e8 7 , the gravitational force acting on the 1.00 kg object by the Earth does 10. 3evpo;-bzvw78 gxc6h 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floo+lgs.ds:sv3r qz 9g0u r and released. Assuming that the collision with the floor is elastic, whild.ur:z9q gs s03gsv+ch 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/s. The driver 2.fm ako0u kc5ri74i qsees a barrier ahead. If the car takef7c .ui0i25mk4oqakrs 95 meters to come 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 it st1gsqq:yd ,gh 0c*/cxlops. If the balc/ lcq:qhgy s0dxg*1, l travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts ojvxrg( y 50/smf different masses but identical kinetic energies and the three following statemegryxj( m5 /0vsnts. 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 ov tw,.3g*xgktossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its hiogk., t g*3wxvghest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary con, xv 1*m xfup++x:dppscrete 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’pp*xmp+1du:sv f x x,+ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheigzdv9(q6a.fnn (6x7 bsdr -iilhtH above the ground. The object crashes into some soft earth and comes to rest by compre.v66dbxz7nf i (qild-na(s9rssing the earth a distance of H/2. Assuming 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 mass M isfpl92 cayv w;mz08b4/w dtnv- dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximummw2py dv;8t9flanvb 4/wcz 0- 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 L7llqcl o)mq 19g5kyx* is pulled sideways until the cord makes an angle qm5lykl19 )7*c o glxq
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 b.7l9 jq ;1q 5fmvz;nnmzb 8nv 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. Whanqblm.b v;59 7q1 z;m8jnvfn zt is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman 6g2 pi43gj, +xwjp jc sjou-z+moves 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+-jzj wp4 p 2xcs+ ju,goig36j 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 applievxni 2+f qd0 l8nhk-;ud 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 8nvqdf2 iu0khn+x- ;ldone by the force F onthe box for the motion?

  04.48: Two identical bowling balls m,7 l 0 ss0ltfczu7s5jA and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. At cm5z77sfl ls,jus00fter 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 straight upward with an initial nbywk+ fi;jn9 f2wyp 05on-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 of H, to what maximum height does the object of mass 0.5M rise above the lauw+y 5i 0kf9b;n2 fwypjnch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring cop;4jye1 i+;qw(qsms4p iui , zpjwj,:nstant of 20 N/m. The potential energy stored i;zpjii ,s4epw,swjj y muqp1q (i+; 4:n the spring is:

  97.10: A compressed spring has 1-+adds7,9ab dqasu(th dmy,/6 J of potential energy. What is the maximum speed it can impay 9+bdaa s7t hs,u( q-addd,/mrt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from res74 tv9lo3ti ,m r prgvbed3j8*t 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 obv gbr9d o,4 j 3pettv3imr*87lject 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.