97.01: A force F directed at an angle of θ above the horidxf; uo:(48v)ly d/b( zg m isg4vz1vdzontal is used to pull a crate a distance D across a level floor. Thv ( ysdvx(;o du)4glfgv1iz/84dz: bme work done by the force F is

  97.33: A softball player ca2wkr b1-5 c,vd+htmyg8iir9k tches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand mokh r+i51cid v9btwkry ,8-g 2mves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdsk6a. tszf dn7bx -cw(; a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much p 6f.s xak7ztb-c;w(nd ower was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on aq *a5bh2p+: :xzkv ukp horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in th5v2uxzk hp+k qa:bp:*is time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform z+ g5sx)j lr-h6empg4acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in e6p+5gjhrlxs)-g 4mzthis 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 3.0 kg blocc85 vq22f rmcwk for 5.0 s. The block was initially at r2r8wc mqcfv5 2est 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 d1;qbz km 8c ls0.b3swiirected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at 0s8 mibkb zwcq3.1;ls 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 pond throwx2 ,n+shok 0wcs a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction2kow0 x hn,cs+ 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 aee 04:ag c vvzpi2-q5and gives it kinetic energy. An hour after the fan has been tuaivzg25ece40q-a p:v rned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mz66 l/d5ubr w (fhr;slass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an ac /5hfz d6urwlb(rs;6lceleration 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 sher8nv90w cyuaag7; i 3:zop)wi lf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m frv; n7ac)ry:8p3z g aiu9oww0iom 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 (j 7-zyhrf6p 8yabout 32 horsepower) of power to a car's driviny 6z r-p87yjhfg wheels. 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 t4m* 1pvnd4ec/s9y ikji f)h.uhe right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constaj 4si pmid/ .cv*uke ny)h4f91nt 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 spicckm 44m s23g: nefu5eed 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 sp k3sm 4e2mc5ifg:4ucneed 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 stg 3q9 zm:mgag.4eb db;arting 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 :9g 3dq gbemza4;m.gb traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the objesk+81n cvye0kct during the time interval of the acceleration?ykv1se0n+c8 k

  12.08: Through what distance does the object move during the tim-:; en o cm.ivw+4u9pwlgc9c ge interval of tho9 +wm :g.u4g; c-l9cpnevc iwe acceleration

  12.19: The magnitude of t1, 4jf4 7ik9clxjfgu lhe linear momentum of a 4.00 kg point mass is changed from jgli 4u4,fj 7cf 1klx96.00kg.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 interval?

  14.11: A crate gains 36.0 J of kinlndym x0,ztd5vvq9* 7*f7 mno etic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best reprtdd*7v, ml9 x*0ovm7nfq ny5zesents the mass of the crate

  94.38: A force F at an angle θ above thh1/7f03o+gw- tq4zlst,vu m e+tgjrze 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 th q+u/ svwfr ez7zolg -h0gj1m4t3 t+,te 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 poweev5ww s*dei 4-r output of 0.10 w to raise a block vertically at a constant speed. At what constant sp i-e5wvw*es4deed 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 Eartw6h(tku2 *yx9tjd ef 2h, the gravitational force acting on the 1.00 kg object by the Earth dety*d 22hu jktf w(x69oes 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 v* uu8r /xm5r1 gn/fglhard floor and released. Assuming that the collision with the floor is elastic,/1n8mgv5lxf g/rru*u which one of the 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 barm /.hf/;v cc6 fpitv6inz)0 zwqgyl(w b4t:- krier ahead. If the car takes 95 meters to com -q (f6fc4ztmi/yvk6;ihc/g lb )tz w0wpn.:ve 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 slowe7;4fwt wwbhhrk t-(3 s down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comingwb4ht k-;w37ter (hfw to a stop?

  02.26: Consider two laboratory carts of different masses but identia8 w4wid4tcv;7 +wprd ka+e5jcal kinetic energies and the three following statements. Which of t pc+tw 8a 4+;jvk54weiadrdw 7he 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 aimy1eul,*op *wr with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when pl,w*m*oeuy1it reaches its highest point?

  06.20: A boy jumps from rest straight upward froxcr3n usyig5+/snh ,qd/a30 p m 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 norc +/iy53dpsnsgq,n 0ha3u/ xrmal 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 ground. The objeky 8,if vlse8vcmbk (a8y5:-:5kqgi jct 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 object whi sg i8y5 v8ia8b-kk5mlvf(jy: e:qc,kle coming to rest?

  12.48: An object of mass M is dropped from aheight H above the grounv8hgly*z)1qe ck (*cbc,sq 1 nd. The object bounces off of a horizontal sl k*8(,c g* vqzcb1nqe1hc) ysurface 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 L is pulle ms4ukcwk (f:ro +uq8/s6eu0e d sideways until the cord makes an angle c: u6(0k/4r qow+u8usf eks em
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 un mvgi 1y88yf2ykq4x)kknown angle. The sled, which started at ygf 28x8iv1yk)qm k 4ythe 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 sidewalk, along a 10-m 1 fysjdlg5.2ueter 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 the1f ydjg.su5 l2 cartons to move them to the loading dock?

  12.16: A constant forc iv-d0d5pm (ya z1f4mxe F=50N (as shown in the figure) is applied for the 6.0 meter motion ofmzfd 5m(ydpvxi 1a0-4 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from the vjg7z.7 y ipz5topvg 7 5zj7.zyip 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 changing?

  11.28: A person throws a cl r4yuu1gi )zp3ti,-kk1l/ ln object of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. Th3ku -,rgi ti 1)yzl 14lkculp/e 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 spring that has a spring constag/a2aq y4 l1itnt of 20 N/m. The poq1ylta 42/igatential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential ene u.k)x, rwe3i5l.ciozy(w y o6rgy. What is the maximum speed it can impart to aric ) kxyzwo(3u6 5lyei.,o.w 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom os5skbc46euoyd ecn: : e 0u9/pf 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 the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient ofk/ube9:ods py4u:e56eccns0 kinetic friction between the incline and the object for both trials.