97.01: A force F directed at an angle of θ above the horizontal is used to p0umlcsv;fbf+g, l 35siuv:4q ull a crate a distance D across a level floor. The work done by lci:s5ub f;gq 4,l+0 mv 3fvsuthe force F is

  97.33: A softball player catches a ball of mass m,s c.2cdgj ;(y 53uwa82mm0mgjayid5x w 0;ow k which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, 3m j0g5cc ;ydogjw(58k 2dwysm; w.aa xu0im2 the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer l+1 m er h7sj:sctw2,x6n kjt,y 0gt;nholds a 20 kilogram sheet of wallboard 3 meter above the trwnmctyg6tn7: 0ek,j2 j+;x hs,s l1floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block bfj,se.vsm. pfr8x3gz8p;g 0slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly ,88 .zfxf0smsb.v3gj;p ge prdecreases 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*fd shp4zy;x1 horizontal surfacexz*f4sd;h 1 py for 5.00 s. The block’s kinetic 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 )d )) 3 ohdbsc7ys 6ji.q3zs h94nppni3.0 kg block for 5.0 s. The block hpz9n37 iiob4)q )hn psy sd)d6sc. j3was 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 jeh9v p+e3 *pqgh9u.s directed to the right is exerted on a 3.0 kg block for *3 uj.veq9+ehppg9hs 5.0 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 init-a,jk)yes 5kl-wy hq (ially at reston 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 ) -yeh(,l skka5qy- jwthe above situation?

  03.14: A fan blows the air and gives it kinetic energy. *mq- y+ztz b s:vvi-i1 An hour after the fan has been tu-:si q1y-z +bmi*vv ztrned 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 posdj83/a uu afe9i7pfk7ition of 3.0 m, a speed of 4.0 m/s, and a3akedp f77 ju8a9u fi/n acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old texl eid1kw) gm6tz14 gx1,:, zk2ib9wb .nqwkbxtbooks 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. The box has a mass oze 1k9:it,w1 q6l1b bknbw4igzm kx2gdw, x.)f 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) l /p.nhm(pul 5of power to a car's driving wheelh l(mp5pnu/.l s. 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 ao.s3z-v9 z 2vzimbv*p 3n1ldl t 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 left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed bzn*io3v.vl 1md z-ls 3 p2vz9of 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 movexr /15r4l iipps with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with consti pl/5xr1rip4 ant acceleration 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 starting from rest, along a straicvg) 634rwj/w jdu+ dlght road. CarA has twice the acceleratio) rvcl gw+jj3/w4ddu6n of 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 the object durinmh 2 x,/f9i ux+1lyk o*(spxteg the time interval of the accelerationofi(y p1,9+s hlumxtx*2e/xk ?

  12.08: Through what distance does the object move during the time interval of thp; 4:a.prqlj95ge xnw3n 9 stb2 cr)uwe acceleration9 p:2lraxq; t.9nsu)ce 5j n34gpbw rw

  12.19: The magnitude of the liey7fzuef)e f1 uh,. lemfk pggb67- 8+near 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 i .m 7 egf67ee1 )g8,uf-pfykul fzhb+es the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energfn) s2ahhl *-my while its speed is increased from 2slnh *2 h-fa)m.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above thmk)a 0f4y rn.t0br-ac e 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 by the frictionac0 rytaf mr4-b0nk).al force is:

  14.31: A toy crane exerts an upward forcnjl-d2(j 5rlge and delivers a useful power output of 0.10 w to 5n gj-dlr( j2lraise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released f 1 djsxbw 2sl52weq3v,bk6a2r rom rest 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 donkr d5x2bs1 l, sb6jv 2eww3q2ae 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 and l83p 4p.: jbdrfwc ud*released. Assuming that the collision with the floor is elastic, which one of th pucp:*djb3r dw.4f8le 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 barrier ahead. If 5)5j 8m kutkdyvl;5vothe car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?ojvlu m)5;5k k5v ytd8

  00.26: A 500-gram ball moving at 15 m/s slows down u3ez +nw8lecj.2ufl6o niformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to uew2 +zfjl 6ec.ln8 3oa stop?

  02.26: Consider two laboratory *7cdjl; ce8/f snq8if carts of different masses but identical kinetic energies and the three following statements. Wh /7cnsjq* ief88 ;dcflich 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 air with an inits 7/z) cjqn x;zj/off*ial speed of 4.60 m/s. Ignoring airfq7/* ) ozn fz;jjxcs/ resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwbke+ pqock2(gulxq+j9 z 18u0ard 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 anu 1xklugbe jq8c(zkq2 +p 0+o9d the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightHdy; ja23 nz +2xxoape5d/nl +l above 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 resi23lx; /oyddzl a +a jp5xn+ne2stance 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 grounls-)m c 0lvm 4xc,jz1n c4x0bdd. The object bounces off of a horizontal surface in a collision lasting time T. The0m ,ncv)mj bzdsllcc4x 14x0- 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 cord length L is pulled sideways u. mez9 dej11nqntil the cord makes an e19jdz me .1qnangle
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 unifor8mcs 4+(m wxpz9:mfjxm 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 to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its originacz9 mpfsx+(m:8jm 4w xl position at the bottom of the hill?

  06.09: A deliveryman moves 10 car b3u wt q njn0,d*em;kp/-d1frtons 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 deliveryman on the cartons to mdn0/;fb*,jnmr3 -teuqk w 1pdove them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is api-.uz)fqi5 ryplied 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 forc)ryiz5 uf iq.-e F onthe box for the motion?

  04.48: Two identical bowling ba 6sy ;jh+nj2gpb3jmk0:o od.5teoy b*lls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A stpk mo;2o obnj+ e:yd.y5g b63shj0*jtrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M str-ip4d bqd-) jxaight upward with 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 speed 2-4db d) jixpq-v. 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 s0j) s 8djmjc.ftretches a spring that has a spring constant of 20 N/m. The potential energy st j js)jdmc08.fored in the spring is:

  97.10: A compressed spring has 16 J oq)afe j5, lzm (p8,)ezvhe3rx0ham2jf potential energy. What is the maximum speedp0eaq82mj,,afzv z5em lex)hr3(jh) it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline o 7ru1np t;) b+xcsptd6f 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 fricutb +p76)p;tncs 1x drtion between the incline and the object for both trials.