97.01: A force F directed at an angle of θ above the horihz4x*pc:;czpe t9m s7zontal is used to pull a crate a distance D across a level floor. T9s * ch mce7zpx;:4pzthe work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving tqikd-p/,dup u f40h9c oward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the 4ip,fp/kq u d-h cu9d0horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kix z2 +.ay1fk pp9:xglplogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expend+ a pl1k:fzpxxgp29.yed on the wallboard?

  17.11: A 5.00 kg block slides wc0p,f 25ucpzohv/e 8-r rqpn /ith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enerh/ n,z2ero5pp0 r uc8v/ cpq-fgy 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 a9a +x zf0l))foyo e:izcceleration on a horizontal surface for 5.00 s. The block’s kinetii xz+layf0o9f))e: zoc energy strictly decreases 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 -vqfe: i1 kz6hvys27 (iewz4z kg block for 5.0 s. The block was initially at rest and slides on a horizontal su-(yvz6he :fsw1i2 4qv7k ezizrface.
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.qhclykd jl(x69 pv:ek z2 /g*40 kg block for 5.0 s. The block was in64/ cdl2*hkk g9 zq( vl:xpeyjitially 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.))zp rwdax k1n i1yem:2 nd0s 1 kg hame:).1irs1kpyznd m0 xa 2)nw dmer 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 above situation?

  03.14: A fan blows the a)* lxxs1au gr9ir and gives it kinetic energy. An hour after the fan has been turne1ag*x)9xlus rd off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block llm8,srm,ppymc+37 l of mass 0.50 kg has a position of 3.0 m, a speed op ,lmc8y3pmsl7, l+rmf 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 texts1xms:m6;qk y books is on the middle 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 f s6k;m m1sxyq:loor, 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 horsepowerr1iaa7xklxn 78rn , y4) of power to a car's driving whee, 774l rxya1nri nxak8ls. If the car maintains 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 5.00 m/s at the:--l(r5sjfv ib wk1iu0 becv5 bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incli veuc libk0( 5- irb-j:1sf5vwne 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 tvn -3:s9gnsp bhe bottom of a rough, fixed inclined plane. The box slides with constant accelerationb:sng -9 snpv3 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, each star7f:fplzf en rg**g1a2ting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. Whenl2*g*zffar17g: f p en 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 3yo4fu3*hty2u ok7 c otime interval of the acceleration?*u7 2oy4ot cuy3ho k3f

  12.08: Through what distance does the object move during the time ianfk rfd8c/) 1nterval of the acceleran1c df/k)8fr ation

  12.19: The magnitude of the linear mom u1mp-y)ddmvdp 4l:r15 vp u,lentum of a 4.00 kg point 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 t:dym,vlu l)mdr5dp-11 upv p4he mass during this time interval?

  14.11: A crate gains 36.0 J of ir9y gtqqka;80hcy2l7+rzt z/;sgb: kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best y t8t7lh0r+qzcbz: qi9a; sg yk/2rg;represents the mass of the crate

  94.38: A force F at an angle θ above th u7ys e+*rui1v0vh 0dne 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 d*0un071u sh+ v reivy μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliverp wpf oq*5/b-ns a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.2-/*wq pof b5np0 kg block?

  12.18: A 1.00 kg object is released from rest near the surface)s9y;xe:k s)bdny l5csx 1wq . 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 5b.1ydx)q;eksxw)sl :yc s9none 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 motm4 l3z/egqamx()j9oh ;2emme ionless a height ho above a hard floor and released. Assuming that the collision with the mmo/ 4eml3xqh z2 a;e)m(g 9jefloor is elastic, which 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 sees a juehez*8 /jva807ix mbarrier ahead. If the car takes 95 meters to come to rest, whaue z8i7 j8 ah0vjxm*e/t is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15mhad 9;h8nwfz5sa( /q m/s slows down uniformly until it stops. If the ball travels 15 meters, whafh8zm;59/aa(wnsq hd t was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic kq+4u4)onybm energies and the three following statements. Which of the above stat4nk 4qymu )bo+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 tossed vertically in the air wil7quu-1mw s eo76hphevv;2u1 th an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enel172 vuho uh16v;eu-q mw e7psrgy when it reaches its highest point?

  06.20: A boy jumps from rest uwgcw5 n c7pej52rxi p2q -;9fstraight upward from a flat, stationary concrete surface. The boy, of mass Mqw npw ;- 9rc5e7gcx2fi 2jup5, 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 boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obj3 -j-5b aomjsxect crashes into some sx m5 j3--bojsaoft earth and comes to rest by compressing 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 is dropped from n;b,fmwc);wi 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 maximum height H/2. What was the magnitude of the averagwfb;;i )w mn,ce 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 unzoe4rc8r;x0) a s g5qtb/a*bc:y niu6 til the cord makes an acizc/yn baoga)s rrq:*6be 4;u5t0x8ngle
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. Th0otv64tz5 zr4d 9 a2op;dlyqi e 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. What is the sled's speed when it returns to its original position at the b6v;4d0 4po airzqz odlt 95t2yottom of the hill?

  06.09: A deliveryman moves 10 cartons from tw *t -r uju+ocahpgkdvh8:e) -m7ch0*n+ w+v fhe 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 ch ov+ -f+nupch:7+8mt chr)j0 *e*wagvwku -dartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure 1jub c:ma6ev9) is applied for the 6.0 meter motion of1u mbavj9 c6:e 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 by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from the 4dg5r1t 2easetop of a tall tower. Ball A is dropped one second before ball Bas5re1 ed 24gt. 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 throws an object of mass M straight upward brw 4o aw+ql5( ed 7a.cazi07gwith 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 0.5M straight upward with initial sp +dg. a5(aal bc4i70rwe qwoz7eed 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 pci 8y69/vol7 .lvp rqthat has a spring constant of 20 N/m. The potential energy stored in the springrvyc vlpoil 8 /79.p6q is:

  97.10: A compressed spring has 16 J of potential energy. What is, 3db owpsx:z1 the maximum speed it can impart to1, spbw:3 xozd a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at thenwt0z969e hjlmnk; 4f bottom of a fixed incline of height H. A pwhkm;z6 n 4tj9n9elf0erson 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? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.