97.01: A force F directed at an anc0y c 5jtfvxojf q pf37h.e635gle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work d5jtx 5eycff pv fjoq3c6 37.h0one by the force F is

  97.33: A softball player catches a ball ofh +e9k ofiwi :ceyulb07bk :,+ mass m, which is moving toward her with horizon+uwk9eb70yh,ef io :+k : bilctal 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 hand is

  99.14: A construction i+ )qnlxwoi5y6 9;v h lny3j(claborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshowcq ly(9v36i)i+n 5wxoljyhn ; much power was expended on the wallboard?

  17.11: A 5.00 kg bloz* iu )vx:cbx0ck slides with uniform acceleration on a horizontal surface for 5.0b0z *:u ixcv)x0 s. 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 uniform ai)l q 7yih uow(.ih6i5cceleration on a horizontal surface for 5.00 s. The block’s kinetic eno iiwh(i)lu6qy i5h.7 ergy 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 t3h9fa:fh ,p x(nw ljb6bzh19vo the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surf,f9: xna(bh bl jwfph zvh6139ace.
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.gjqx+zqv 0g0 90 kg block for 5.0 s. The block was initially at rest and slides onzg90 q jgvq0x+ a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially a2-b4t aqxb4uxwl3y, ho g ub)3t 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 o agl 43xo2b3,b t ybu4xqh)uw-ff in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after thew /dh;i.w2wo/yi ga*.qzns: d fan hawzg*da;.nqi/hd s y2/w .:i wos 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 positis :rer1 sx6dz6on of 3.0 m, a speed of 4.0 m/s, and an acceleration o rsszr6d e1x6:f $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in t bf+ 3z)kuw(kg1a+pe/hj/v lxhe 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 bob +zw+(gu)/h3 j kkeaf/l1vxpx has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of powet h d)k ic9-kz/ab;yhue/kehje30;+s r to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude /k) hc 9i;j du0+k;hbhte-s ke3yaz/e of the retarding force acting on the car?

  09.13: In the figure to the rig*pal+7y1fjf 6.kfo h uht, a box moves with speed 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 to the left with a constant force oa6.+y pk j1 *flfufho7fF = 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 aklfb r-q cfi97 6gf.18 j,tdqthe right, a box moves with speed 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 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 inc17dg.tbji f689fkrlqa , c- fqline.
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, alongen:.hcd s0y hl)5zun) a straight road. CarA has twi5 )c.:h shz ul0enyn)dce the acceleration 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 during the time inters/fo lg qy+9xo k9l,rya;lc*. val of the accelerationqog lxr.kly, c+ *oa9/;ys9fl?

  12.08: Through what distance does the objh jji1g;fj(z.lx+ 5xqect move during the time interval of the accelerat ;f jlhjxiqj5+.g(1zxion

  12.19: The magnitude of the linear w/+qmzr4wgloaw28- s 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 enersw 8lgw z2/oa4 m+wq-rgy of the mass during this time interval?

  14.11: A crate gains 36.p* m:*) m/fazilqj7sh0,:cn *pcpe d a0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the follom*c:ppz,: n/ iq7p da* smh)c0*lajefwing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used e6zoc stg 3z2t4zk5)qaz/c6tn* m0sr to pull a heavy suitcase of weight mga distance d along a level fl56t rgockt6* z2s m0n/a) 4ezzz3qtcsoor 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 ford3* ) cfkajketfsra6zt50u0 : ce and delivers a useful power output of u*ktdfaj 56 er3 a0zc:)fk0ts0.10 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 object is r : hv4ps;zuz-meleased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by themz;s h4pvz u:- 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 and rel5tuyy/g kjw 9s/+cz(ia8. vvq8- jbqlp2g/qveased. Assuming that the collision with the floor is elastic, which one of the following graks tvqvzciqy8la-2(j9 +5wb/gv/j guy.q 8p/phs 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 ryq(oywcm d35qw23;f at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters toqcy(5q;d wwmr3f 2yo 3 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 uncrcu +,s(jke 5til it stops. If the ball traves,(u5cc rjk +els 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses bu(nzfp/d 1tk+cn+k6c/ o s ixr8t identical kinetic energies and the three following statements. Which of the above statementsrionkd8 c+k(/x6 cns t/1z+ pf 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 init)7mf m8krf*jvyv 0z t8ial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches it*r8 )ymvkz jt0vf 8fm7s highest point?

  06.20: A boy jumps from rest straight upward from a flat, statiu::l3-n i1 kbzmdgv-yonary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and dl1g-z bu3m-yv:n ki: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 and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the grounr )qw5.ql;;;m n towbcd. 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, what is the magnitude of the average constant force exerted by the ground on the o ;.;qwoqn w )c;mrtlb5bject while coming to rest?

  12.48: An object of mass M is droppesbf7z9( n e r ;-u. tz1g/x,bdhmpn84k6clsisd from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. Th4 mg c.8tir;6dzunsfbk9 /7s-n ep xb(1,zlshe 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 pubngjg3g*) l 0z2bfa6tt0ab( illed sideways until the cord makes an an)gz00 fi*lgb tg3b6 njaat(b2gle
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 6xv9skq e9aj +dmit*+ lokz,9unknown angle. The sled, which started at mojdv a9x6+ k9 i+zslq*etk,9the 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 original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the s xq d0jx0(zkh:yd.1haidewalk, along a 10-meter ramp to a loadi0 qyk( 1j:xhdh.da0 xzng 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 move them to the loading dock?

  12.16: A constant forq7rwe u4;u1unnj,kxh12 a zq,ce F=50N (as shown 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 one of the following choices best represents the work done ,k2z1; ajnx wqq41uhen7u , urby the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fromrpfu:*z 9 76djxhev 304 hpirl the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before b0d l9uj e:h*hr6p vrxzf4i 3p7all A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass1 c /jxq,ur-7te/w wmo M straight 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 2v. In terms of H, to what maximum1,- r co/we txqmu7jw/ 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 of 20 N/h58r (biz(5;/p(vml s-k jra ppl5ft rm. The potential ez/lt(vpsairm(rh855j ( fp;rk 5 b-plnergy stored in the spring is:

  97.10: A compressed spr9 wu8f) qyvgo4opcqd jmj0-t *a.c9+ qing has 16 J of potential energy. What is the maximum speed it can impart to 9q9pt jco*q.4 dc)a+0-wvu y8gqjof m a 2.0-kg object ?

  

  10.31: An object of mass M starts from i4x-d4 nm:rxbf k z(f*rest at the bottom of a fixed incline of height H. A person decides to push the objn (ix4:-f*mdxz f4brk ect 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.