97.01: A force F directed at an angle of θ above the horah;t;dxsrxs2y68f 6vov5e 6 cizontal is used to pull 6cxv e5y6ovstfrh86s2x;ad; a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of m;.4npx4b vexb9 mg0vf ass m, which is moving toward her with horizontal speed v. While bringinggb m40v;94v. penfxbx 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 20 kilogram sheet of wallboard 3 meter zg/c/30i 1if az2 xg1bupz+frabove the floor for 4 seconds. /zg2 1 i3 izuf0pcxf1zgr+/ab During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hori )tq8 /y +prg:nucnmh-zontal surface for 5.00 s. The blrnp hc8+/q utm)yg-:n ock’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 oj srx itoja:..y.n/,cn a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this tit:. asyrj ,/o..njxic me.
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 tb p4+xlav0r a/he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a+p0v/ a a4lxbr 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 exerted on a 3.tuxhmdc-;6g 5sf:h )x0 kg block for 5.0 s. The block was initially at rest and h5 6- x)sumxdt;:cg fhslides 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 throw73 sqp2+u/him., xvlnsxq( mr s a 1 kg hammer in one direction. After the throw, the q,27mrh(s3+u/xn sxq .lpv mi 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 air and gives it kinet (jcx.lnrudh cvb g:f b2mz6x5/47e/jic energy. An hour after the fan bh:ev n7/rx.z bgc2 xlf(jj6/cd4 u5mhas 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 has a positioz82gu ,stb- co:nt i,ql87ebnn of 3.0 m, a speed of 4.0 m/s, and ,u 8iqzsbgtbn ,2 :t e-no7lc8an 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 bookroom f bik546w vl-s1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how is6bw v54-fk lmuch 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 (abou+ j0) )1hzg9av wummtot 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 actin mumhvo wat1gj)z9) 0+g on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/lzyj z; o8ok:f-x6+ jzs at 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 thxz8 lko6zy-jfo ;+z:j e 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 the bg*sn+t s*mqg qbp5b1 ,ottom 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen,ptm* g51*sbqgq+ bsn 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, dzdz1 kk x2*ne x/:+ndalong a straight road. CarA has twice the acceleration of Car B. After traveling a distance knx d:1 dxz2dze k*n/+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 during the time iylo-ai3circ eu:*x3+nterval of the3* lyicr:-e ioc3+uxa acceleration?

  12.08: Through what )ykbfyatw5 8ag+9 y ;kdistance does the object move during the time interval of the acc+af5 9yayw)k;8 bykgteleration

  12.19: The magnitude of u(z9 oj9x qy4z;yt b(jthe 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 mass during this time interv(4zz9u joq j b(yt9x;yal?

  14.11: A crate gains 36.0 J of kinetic energy wk9;c;l*hi ikr5 he40f y rvgp7hile its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mas*0rgli9 i hkr4 e5chypfk;;v7s of the crate

  94.38: A force F at an angle θ above the horizony pj9h3:s4zf;lvzh 5afu ;slbbzn6 2+tal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocit9 f yhbvzz:j l6 ub34 zp;;ls5h+afs2ny. 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 exerts an upward force and delivers a useful 7.wrj0*n g vw,e xciv*power output of 0.10 w to raise a block vertically at a constant speed. At what xje0 g.wr c*n,wi*vv 7constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near ttzcshov,ppbq 45s 150he 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 the4vhp,bqp15 s0 zscto5 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 mod/c gt83 pphnr59xm2eb b42; ou6 dqaationless a height 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 bd4qp a /bn 5mudrc9p;t3ae6hox8g22 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 barru6xy(ba mv5u/ier ahead. If the car takes 95 meters to come to xbvam(u65/uyrest, 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 1d,tfe ,aj;ee until it stops. If the ball travels 15 meters, what was the average net force j,1dtfe e;,eaapplied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but3wrbzz -a- hz: identical kinetic ener3rz :zab --hwzgies and the three 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 ai ,ky l0e /b;rdctzij,.r with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potl kdjei.y;rtb, z0c,/ential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, styvsk+3.mkn 9v ationary 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 b.ym9vsnkvk3 +oy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from a-zr(sqk,x zl0 ha 0iz9heightH above the ground. The object craskxiah,9zs0 zr-l0 (qz hes into some soft 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 aheight H above the groun ;djy8ulbpg7xq .qeuk.*)dl6 d. The object bounces off of a horizontal skl*8 b..yulu 7;dgdqqj 6x)peurface 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 cord length* kle0, px k190zgs/ zb9svqks L is pulled sideways until the cord makes x9vse sk/l0k 1bq*9 0zg,pskzan 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 ang e;7t0g4 dih7ajr to;jle. 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 slea0tje 4jgdi; 7tr;o 7hd 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 deliveryman mov.3kayzaut,v :m s; . n0cu2dfaes 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 ;a3uyzas.aut. nd2:vfc0,k m 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 in the figure) is applied f om 9u/*senuzu(i.h)zor the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of t).uoe uhn/z*9 z(ismu he following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling ball3bza 17,iguzn7zrxfv4-7 6lakkjqbt vw6 (q9s 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 strikes the ground, how are the mechanical energies oqiawvb x, 736 j4-kltz76 rq 7 zguvnf1z9a(bkf the two balls changing?

  11.28: A person throws an object of mass M sh 6f o*wxrhgp:n9pb 1a1(fit:.j a, nmtraight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. pbamg1 (n*i px,.o:1hhwta:rf jf 9n6The 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring5m+u0pqy2s*mw. b gxt that has a spring constant of 20 N/m. The potential energm2 t*py.0qw5+m xgu bsy stored in the spring is:

  97.10: A compressed spring has 16d. ox1lvefr-8 spcfx*fle4;n-c)um - J of potential energy. What is the maximum speed it can impart to a 2.0-kg objec.l-)1lrx8- vfxncdfue- *oc;4pe fm st ?

  

  10.31: An object of mass M starts from rest at the bot/hyy ax,;z z i8*ow3v/ax k(5o5thdmutom of a fixed incline of height H.h*y mayxv /h odtk;wuo/ax5z 3z5,i( 8 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 between the incline and the object for both trials.