97.01: A force F directed at an angle of θ aboi7kxm*xz 8bpsv44q, pc+lpo7 ve the horizontal is used to pull a crate a distance D across,zcpmp47px 4qix +sk7lb8v*o a level floor. The work done by the force F is

  97.33: A softball player catches a ball of uh.3df yyfv 5)zle*y2mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back luy5)h3*f eyz 2d.fvy a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 ks0,t(fmnjog: f0u 5m nilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power wasft:ju0n0 ,n(5m omgsf expended on the wallboard?

  17.11: A 5.00 kg block slspqti(*d12 h 0t-dsnwkxc.p ;ides with uniform acceleration on a horizontal surface forc . *tppq;s(ni1dsdkth -0x2w 5.00 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 uniflkakqt u -t4a0,zzuu84. jl+ worm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stricqt-40z+uj.w 8k kat l ulau,4ztly 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 +o wif6 ,dzwyn ums9fgbq095vr:k-j4 on a 3.0 kg block for 5.0 s. The block was initially at qn 0 w69zuwvr +j4d mskffi9bgy5-:o,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 blocjn7 9wnn (bs-ik for 5.0 s. The blockbj 97n (-wnsni 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 initially at reston a frictionless frozen pond5bt8 *grxmg ax3d 38o;obr* ej 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 o ote *jr8gxxg;8boa3 *5mbd3rther direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air als)-weav*a2r-s 3 o jdnd gives it kinetic energy. An hour after the fan has been t wr *sovl3a-)sd -eaj2urned 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 arq4r v:q35 yaposition of 3.0 m, a speed of 4.0 qa4 q:3ayr vr5m/s, 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 the middls60a3lk 8z+krho vy*k8 opaq8e shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.l6 o*+ 8say8avkz3p0 hkoqkr86 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 deliv;ukrv 9fmg u-b:i*h8uers 24,000 watts (about 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 rkig :-f8hrmu b; uu*v9etarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/yx csd i5fb pmfyr k ps0-wrmmw;7 5**tiy6(8-s at the bottom of a rough, fixed inclined plane. The box slides with constant x*p c*m mkyib7 ( ysrt0mfr5865wifs ywp-;d-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 with speed 5.00 m/s at fq :ncl/7xzp)the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the inclin c7:)q l/zxfpne 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 stacygic5 , ego;s a xqu ;w./uchwt8m090rting 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 Car B has traveled the same distance F, what is u.g,; st/co;a xweq c mu05gi0whcy89its speed in terms of B?

  12.07: What is the net force acting on the object during the time interva/o; cl+7rtszz3y l :ful of the accelell c/+3 urszty;o:z7 fration?

  12.08: Through what distance does the object o/c,cw :d9vijmove during the time interval of the accel io/ 9wc:vcj,deration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is ch7uu4qfv*uf:m8ysml v s/( 5cbanged from 6.00kg.m/s tof/4c( vsy* umv:bu7q8lu s m5f 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 interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increase4:nb lk loq12l0ci2r hd from 2.00m/s to 4.00m/s. Which one of the folb q4lin2ck2lo0:lrh1lowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is9ta s-lcyfe)9 used to pull a heavy suitcase of weight mga distance d at9)ef-l acy9 slong a level 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 force andk3w 9tm6drdx+/w yo 4f delivers a useful power output of 0.10 w d /t9yk6mxdwo f+3w4rto 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 released from rest near the surface of the Earth, thee*mm 680obm(u : gilgr gravitatigm68l*ug0bmr eoi(:monal 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho above a harvva3o v *9kbn .9+6bdqfws0yld 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 sn lv+6by* 9w0d3.aqvf 9bokvsurface?

  07.06: A 500-kg car is movingymu .t65-ohiv as4jp 7 at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of t aoy-m5ijsph7 4vu6 .the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniforwul-7o6vtra7 q6 h dp.mly until it stops. If the ball travels 15 meters, who-77r twuq6d.6l pvahat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masysak cjhfng(a25t 8bud: 2,f1ses but identical kinetic energffg5s2 ( t ,18h bdujan2k:cayies 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 ofzxu 9 s1sa+8zx clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change 9zxsuz8as1+x in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight 7ulg 9 tz,lypbq5/acd+hj ;/ j4 iqk4lupward 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 distan jbk5j,qlit+y;g/7c4luq/ 9al4pd zh ce 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 p uw7y*4sck3 ;emb)jkw -kb3cabove 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 resistance is negligible, what i bc3 jwyme)-uwp 4*kk37 scb;ks 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 aheighdpxd6 ln+hxf9*n yz q -/2cy*3 2hkubwt 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 average net force acting on the mass during thcz*y 2 wyx9fbk3n +d2ph/ql- h*d6xnue collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidew8vqeth3a*3v xays until the cord makes an angle8 xvtqv 3he*a3
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 unknowxmcls sj9;m++ iq7dqyp-3r0 d ;m-mh zn 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 sledqxqc y7m -dmms izmr+lp;9j+ 3h 0-;sd 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 sidewalk, along a 1y09:4)wyb 9dmxyj9l i rfsvc60-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each c6mb9 ijf9d)9yrwxy4vcy l 0:sarton 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 forceutget1ieu 16c8d1 3kt 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 by thueu ce3k1dtt1 61 itg8e force F onthe box for the motion?

  04.48: Two identical bowling balls A anrfv:c,.s. g;z0b,rt :e4n0ubn ff rrj6wh0 a fd 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, hfrr ,0: uv c nws6.r:4 zb0rajg bf.tfhne0,f;ow are the mechanical energies of the two balls changing?

  11.28: A person throws an obje4 rk 4c+9ghlkwct of mass 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 maximum height does the object of mass 0.5M rise above the l+g4rhkl4 w9k caunch point? Ignore air resistance.

  96.20: A force of 10 Nip2n*7znwi p 7 stretches a spring that has a spring constant of 20 N/m. The p7iwizppn*7 n 2otential energy stored in the spring is:

  97.10: A compressed spring has 16 J of pbetuj( .+ijp )2-mn 5pgr4kpuk-t043b ql zwhotential energy. What is the maximum speed it can impart to a 2.0-kg)wup4 23z tk5ublqnjt ( j04g-epp+mk-.rhbi object ?

  

  10.31: An object of m 9)dmy06nmd1hfyi kc:ass M starts from rest at the bottom 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 incline with speed V. How would thehd0y1im)69n m:d kfcy 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.