97.01: A force F directed at an angle of θ above the horizontal is usf -oxx e,cx2h5lsh 69kfpn ;+ p8ixvj3ed to pull a crate a distance D across a level floor. The work done by x ohe3,6-l 9p xsnfx+c kvxj;2pfh8i 5the force F is

  97.33: A softball player catches a balb :o9nci3.8bg 9hfu oal of mass m, which is moving toward her with horizontal speed 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 f nca boo3bh:9. g98uihand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 metera/f9(omg74u k .hq0u alf n(pi above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?n .o/f4aqu0g9i7 uafm(ph (lk

  17.11: A 5.00 kg block slides with uniform acymxxs6/w3a. /uj;lic9a1 +r xmb ia(,p - khsuceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J 9uar; /cybpms/xl.akaxi(i,- 3u1s whmj + x6in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bgrf. o z1k*oermhwd6+ a 5q8r5)ey: r:xb 1lhxlock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kineticfgorrkyz +w 18d:l.e :rhxa5o1r6bem*qh)x5 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 for g332xrcx qjuzv(qu7.ce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slidj.3rg7x 2vqq xuu (zc3es 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 e u. oc6x9vy(let.*if*u d0p bpxerted on a 3.0 kg block for 5.0 s. The block was initially at .xf u *ivoc.0p6(te pl bd9uy*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 r4 -5q9 er:z gs-nnh;ztdbd(i:c*fwp 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 des rcew*9 rnz:hz5g;bd- qnp4tid -(:sf cribes the above situation?

  03.14: A fan blows the air and gives it kineticc,5jxh chk y9 ;;waemw4u+lm3 energy. An hour after the fan has3+, m4w kuhhx 59w m;;cayclej been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg ha;c pp e3nt*y3is a position of 3.0 m, a speed of 4.0 m/s, and an acceleraep33tni*cp y ;tion of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooksydlta rr6e2lp v0 6( 3za)ebl: 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 floor, how much work does he do on the box. T ba2dz(r y0t66pvr3 lael: )lehe box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abht47ongbd ;e (out 32 horsepower) of power to a car's driving whee go(bhdn7;te 4ls. 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 sperhwtl u(*z.(jed 5.00 m/s at the bottom of a rough, fixed inclin(h*ju rwz (lt.ed 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 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 wigdmre 7ag41ahe oz5ezgu7 n b 04:qn/0th speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration emn:1n/zo 7ubeqg 47gda54hz a00egr 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, eaz)dhpu- ema//d dog 9/fai30p ch starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Cadoidu/-0 g 3m/ppehz/ad )fa9r 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 interval of t 14hwcd-6ln rhj81zbx he acce n64hj-8wbx1z hdrc1lleration?

  12.08: Through what distance does the object move dkmt5wgs u46f5;n ng /guring the time interval of the acc54 5ufwn;n/6 tgg gksmeleration

  12.19: The magnitude of the linear* o+*vw+y0v :nlonuy(fh3 dse 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 kin* sy:n0+( ovufy oe h+wdl3*nvetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed isuilrx56 u)tj* increased from 2.00m/s to 4.00m/s. Which one tlxi )u6rj5 *uof the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above ais kn-m*1hnl/3 rhd j4,:; xl0fqkmbthe 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 xin r/*b 4jq,3lhd:mkal s1- f0hkm;n μ. The work done by the frictional force is:

  14.31: A toy crane exerts an uakd3r1nfd*(ff,nw2d2 rjt, f2q wr )we,-cu upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thi 22j-1w,3rtfa,dffcnq)wknu df*e dur2 w, r(s crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near thk)f*7*(m4 ykt,jp ferbuzb y5e 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 by the 1.00 kg obj 4m rpybbt() u*k,fkjz 57ef*yect during the fall?

  96.18: A rubber ball is held motionless a height6x p yb(ay9wh8hka,i1 ho 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 between the total energy E of the ball and its height h above the surfaceyhw 1,kiab6 y8hpa9(x ?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. I: ck*tefpsurf*yp3* .f the car takes 95 meters to come to rest, what is the magnitude of the minimupsy fpc*.:kru*e3f* tm average net force necessary to stop?

  00.26: A 500-gram ball moving 6fq,+l9yadma at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it wasym6, da9lq f+a coming to a stop?

  02.26: Consider two laboratory ca6es zfbq8rw :9rts of different masses but identical kinetic energies and the th brf9e6sqw:8 zree 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 vel) tj(zey+,2uav pi8artically in the air with an initial speed of 4.60 m/s. Ignoring i,z8(ta)uj + a2yevplair resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigh,; gz3sm+reqd t upward 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 +3merzqsg , d;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 grouq 36 ndntnj3o(nd. The object crashes into some soft earth and comes to resj3on3 6 (ndtnqt 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 droppedut22m03mb i fd from aheight H above the ground. The object bounces off of a mfm bdu 320i2thorizontal 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 c , zfrso4:d,*;.4fmnbbv oouxord length L is pulled sideways until the cord u:4bsfb* zo.; oo, dxn,vm4fr makes an angle
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 anglelj8bl /j - kxaz2c8xy.ou.lh(xsw;.8z z q6tx. 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 to rest. The sled then slides back.828xal 8/6k ht (.lx.;ux -z bzzlwyqscjoxj 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 frku7rw-,i okcjc f. 30wom the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 mi3 . oku kj,f-c7wwc0reters 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 showng)bu8*;pn d zq in 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 onbqd; *8zung)p e 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 areoszvu 7jby2h 5)+e/avuy;x-kcb cb 0/ each dropped from rest from the top of a tall tok7sbvy/u2 ycec5oz /;b vba+ hu)- x0jwer. 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 inik u o-j v/he)v)2wpdmo+mhph8:i1 90i nleb2 utial non-zero speed v. The object rises to a maximum height H above the launch point. The person now thom pvw92m2 ok))el+bnuh0 hudj1p -8ihei:v /rows 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 czp,( f i)ni2fsaeq zz*,om;; xonstant of 20 N/m. The potential energym;;fpn,szieq 2fxz (z ,*a)i o stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximu *nkxt2sgo15a7r9l jam speed it can impart to a 2.0ko nja*59tasgl127xr-kg object ?

  

  10.31: An object of mass M starts from rest at the bottog t3ewsd(b5-vm 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 inclineb(td -svgew53 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.