97.01: A force F directed at an angle ofa3sa r;2dsfk7s *iuw8 θ above the horizontal is used to pull a crate a distance D across a level floor. The work dos2fd a*a; wsruk7s3i 8ne by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her*aax/y.h 5ido;y0 pdt 3 pbw(h with horizontal speed v. While bringing the ball to rest, her hand moves back a b wxhp o;yp*i( y0aad.ht35/ddistanced. 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 wallb+5lmsxsk ssi ).7+s,w 8 nohyaoard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the walsx)kao+ ,8n7slw.hsy+5s m islboard?

  17.11: A 5.00 kg block slides y2nr3 1zm+yb2o i2a kchk07xhwith uniform acceleration on a horizontal surface for 5.00 s21a c2 7k3hzyhnbo0yx+k 2mri. The block’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 uninarbefcf--7mz+ f 9r+ form acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases frombafn zr- e+f-m7 +r9cf 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 direc l8 tibq0ysom nc0;f+pgi2bx 4nh96t 2ted to the right is exerted on a 3.0 kg block for 5.0p2bn8 ltm4hi9060;2+ty is nbgqxfoc 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 right is exerted on a 3.0 kg block fo dk6+9i yc20(su woiy9+ ntcgqr 5.0 s. The block was initially at rest and slides on a horizontal surf0+9u +qykd cg6( wnitsco92yiace.
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 throwkh9wsuco l- e1ok +wdk8-fg1yu+ z19 us 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. Whichyz ow+- og 9us1e k98duk -1+uc1hwklf of the following correctly describes the above situation?

  03.14: A fan blows the v6j dpx10 n(00oorwdjair and gives it kinetic energy. An hour after the fan has been turned 6 j p(j0odno001xrvwdoff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0vdb8-fxsm5)kf ae1 r+.50 kg has a position of 3.0 m, a speed of 4.0 m/s, +xf)ekfd5m1absvr-8 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 textbooks is on tpg p9l/pl.; hu m/6vj3ifx7635y mmjbfh 3oqthe middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to t ;h6m x3if p.6 /739b5lmt mgl3uhpvfj/jy opqhe 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 mn ka,k;,go*r32 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 tn ogam,kkr*;, he magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box monfcp2e43lten r39 l dk5ze2. jxr;g7l ves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant 739 jcl3n;5gxetpfr2kznel2 e4r . dlacceleration 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 with spee4+fej 5jhe vq6d 5.00 m/s 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 thfj6v qj54+ eeo 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,b8(c/a f(9 1mueg 8nk fdnfv)u along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same dis8 bgvff c (unea1k fu89/nd)m(tance 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 w +iwyikz26+qthe acceleratiiw6wyz2i+ kq+ on?

  12.08: Through what distance does the object move during hh-4 ke; k;je(+h ; bjwadntnwm8nj(8the time interval of the acb;8ej-dma ; w w8+;ht jne4(hnkk(hjnceleration

  12.19: The magnitude oodt+3y pc x80 q6 9jykyq:*sggf 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 mass during this tiq d36 cyg gsq:j08y kyt+9*xopme interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed ix--6; dejen5ojz zq: qs increased from 2.00m/s to 4.00m/s. Which one of thejedq5--nz xq j;e: zo6 following choices best represents the mass of the crate

  94.38: A force F at an angle t e m 1o(yby.c0 bo1wv6r .uewrc4n2c6θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a levelt bw26obv1 ewoyuc46 . r.rn0e(1cy cm floor at constant 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 exerts an upward for 4)dzyw-d9 )ds sjsh5q41q olzce and delivers a useful power output of 0.104sd 954o)q -h1yd zzsjwdls)q w to raise 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 objecl; tbl 57szep-t is released from 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 done by the gravitational force acting on the Earth by the 1.; t5p s-e7zllb00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard q ba)1qn 81o3ml s;m*fwx4-qfavp )mufloor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows t v3*bwl afaqn;x)1mq8fqp-o 1mm4us)he 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 driveriu*isk t 4+f5a sees a barrier ahead. If the car takess k+f t*ui4ia5 95 meters to come to rest, 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 until 0hhs ug;-+ zn-sohl+ z8svy -hit stops. If the ball tz zo +hs-s; huhv-shgy-ln8+0ravels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cit-b cfn8rf0(arts of different masses but identical kinetic energies and the three following st8tif( -0rfncbatements. 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 isln 5bf l6wuxr4vc:2hypl 5v9 : tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance,55c lf2phuy:xv:v6br9n 4l wl what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat,rubkv++ oqwiiy(*1.b 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 feetb1 u* ori(+iq.+y bvkw and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the groujajod(7:bfib1(j- w j nd. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, 1a (bbod:jiw- 7jfjj(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 a :klqgyzaqct.x5s 2+)-6zb d9xoslcr -.qc 9mass M is dropped from 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 aver .z:axcz g r-xty)kq d+q9c62qb-llc. 5 s9asoage 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 until the c( z mhg uj08(vcu-thl6ord makes an anglecz(g uu6m-j0 (vth l8h
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 upe ;gj7sk57ov;1 qeaih a uniform 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 aboveaee;h7kv;7go s jq5 i1 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 bottom of the hill?

  06.09: A deliveryman moves 10 cart7 10wdn/bcsqtons 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 delivec nqb0/sw17dt ryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the fi dyz 9 :3*1zd2/k9 hisrzsftif05eu*mzr.gxcgure) is applied for the 6.0 meter motion of the box upward along the inclig5u c9 0 *sm*/dr sizdfz.i xzzthy1 ker:329fne. 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 ks x*pn8e 3hz0lzwlc267ib3b 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 of the two balls c0b 637 l*wks ibh znelc8z2xp3hanging?

  11.28: A person throws an object of mass M straight upward withs ty-+c.xnow yo7n,b9xkd x- 0 an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an n yyx-wd t9,+0bsxoc. x7nok- 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 stret(pvqjwx ) a8jhtf//2tches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprina h2vpq/jt/jxt8 w)f(g is:

  97.10: A compressed spring has 16 J of p6*mla tzg0rqi(y x/q* otential energy. What is the maximum speed it can impart to a 2.0-myq * lzi/ xr*qtg6a0(kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline 6*onhk o)q3ndg 0k*b3s q:rjo of height H. A person decides to nn ko:oq qdkg3*s*0o jh3rb6 )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.