97.01: A force F directed *qj ;,opzgch7 m imo1:vi3sx8at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The worv ,37i8ismqo ;x o:*pgh1cj zmk done by the force F is

  97.33: A softball player catches a ball of mass m, which is moviuz v/)vqht 52lpvtv0,ng toward her with horizontal speedvv 25 z v)q0pvlt,h/tu 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 2v)+a+z z kh 14ieh4m*z:nuj kf0 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secon: +ujzf41+*n hh4zmke vzk i)adshow much power was expended on the wallboard?

  17.11: A 5.00 kg block szl5s-2cf q-s 1iupnk6f 95 xfwlides with uniform acceleration on a horizontal surface for 5.00 s. The blockkn f- lsq5z u6195c2ifxwps-f ’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 acceleration on a horizontsflp t j5qlz041r4/kpow 9 bm1al surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in tkjp 1ol/0zs95r4 p4f 1qlmwtb his 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 exert nw,t p y,+hym0.uv afy*g(lxtv:*i m,ed on a 3.0 kg block form*: ,ya+fvltw(. ,pu,h 0*intyymvg x 5.0 s. The 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 r ee;l;b1c6mp:y j;lhw ight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a h61h c;;plbwj; meye:lorizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at restonv2q4ib8a3l x3zhy0j nf-i( sv 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. Whicjvyzlab i2h43 30snv(i- f qx8h of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An dcyzf7q9m .(v xgakvufbuoe772)2 ;xhour after the fan has been turned offd u779y 2x)vvgz(. oeckffmbxau ;q27,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5 5p*y5mvxrrt10 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration vty5r*p 15 mxrof $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelfx,qfhr :s6-0wp )jbl j in the bookroom 1.3 m from the floor. If the janif0hqr,6-jl:x bjs )wptor 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 watts (about 32 horsepber: q ;3sh /y4-jymftower) 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 acting on theh /q:m43tbf ;ry y-esj car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bott,dq+k1k fqy l4d67fbyom 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the tofqy+1ykf,6 bdql 47k dp 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 8b3c7cbjr k8v +z* xee5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to ec*jx7rkbv38+ezb c8the 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 starting from rest, along a 9 j *wfo,0c8kmmo ro-istraight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has travel*-0m fmwkcio89rj, oo ed the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object duri3pz c atx ob3x0me e5ng()x4h7ng the time interval of the acceleratio z3cbx)0 xoetp3x5n (m 47haegn?

  12.08: Through what distak8 hcz*,*t+b z hn/.+zb wuoplnce does the object move during the time interval of the accelerationwblou c8ztn,k+h *bhz /z p+*.

  12.19: The magnitude c3 .xhkoj 8x*g 6pi,* gm1icf+ipb x0pof the linear momentum 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 the mi3jibccxpg1 x*.6 8 hm*ppxf,+o ik0gass during this time interval?

  14.11: A crate gains 36.0 J of kin0wfpvpm-h7d+ )+ ,syicbdxi/etic energy while its speed is increased from 2.00m/s to 4.00m/s. Whicwpi + i)p/xmfc7b-s, dh0vyd+ h one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the 8x h tzpu-:df haa.*m,horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constan,pudmhx ahf-:. at8z*t 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 exe (m,nqa;wssm0d, 7jasrts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constanm7swda;s j,(a,mn 0sq t speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from re 8j-ce) qqkf*ud1y.oqst near the surface of the Earth, the gravitational force acting on the 1.00 kg dc-.yuo)q*q18k eqj f 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 by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor auwshh/a2e6 (c o h9,- do/frvand released. Assuming that the collision with the floor is elasticod2(w/ 6osa -rhfeh/9ua,hc v, 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 driveeud/e4i5t5l94w13 :s-qw vzaa ymcs;9jfchm r sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necess y44qhfsewe ta3 5mum v5 lais-1cdz:;c99wj/ary to stop?

  00.26: A 500-gram ball moving av;u.( po; fh*j2 fyhap +ala1zt 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied wh(o1lf*.; p u;h y a+jap2afhzvile it was coming to a stop?

  02.26: Consider two laboratory car rscql)r er. 81fnx(k4ts of different masses but identical kinetic energies and the three1sn.()4 c l8rrkqe frx following statements. 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 tossed vertically in the p4aujxx-9wxzdlg fmu c- cn:5/+9 +ndair with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reacjag/ulx 9 m5uxwd +-pcxn-4c fz:9nd+hes its highest point?

  06.20: A boy jumps from rest straight uploe,lc7/u(c ka/g m1n:t8tc erz0)xd7 y iq3j ward 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 di/oczl17e )k u3aq d8g/y0clnmj (:trcex t, 7istance 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 5w89n3eo; dqn h9dzjdfrom aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing then8d39o;5 wn9 dz edhjq 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 aheight H above the ground g0v(zaa 2rdi). 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 average net force 2r0z)vaadi (g acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways untilzx -lw:e4jvb1 ert7zj6kc (3j the cord makes an angk4jt3v bjecz :rezjl1x-6(w7 le
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 unifo8./e ilub .oozrm incline of unknown angle. The 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 . 8zul.ie /booto 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 deliveryman9 guz (qczo-o( moves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 me(z9-(gcqzoo u ters 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 the loading dock?

  12.16: A constant force F=50N (as shown in01uo8) tiyc2kuy pwitr *+7ch the figure) 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 the following choices best represents the work done by the force F onthe b) u+io 78ti0whcr1 t cy*ukpy2ox for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from t oc k:dn4:395wtlvl tthe top :lo: tw5 t4tlvk3d9n cof 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 the two balls changing?

  11.28: A person throws an object of mass M straight upward with an inu *m4had(7h +nz 4gsceitial 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 speed 2v. In terda*gsh 7c4e(n4 hmz+u ms 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 .2l kq whb3w-p6y(hxo of 20 N/m. The potential energy stored in the spring i6 hw3 pyk.- qbw(ohlx2s:

  97.10: A compressed spring has 16 J of potential eneras (-m)wznx rw y;ip j* )nd+zym5c0k,gy. What is the maximum speed it can imsydy;n-c znaj+)im*mw, ()wkrpx50zpart to a 2.0-kg object ?

  

  10.31: An object of mass tab 2gh:zja8)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? Assume the same constant non- zero coefficient of kinetic friction betweenj)a8z g2h:bta the incline and the object for both trials.