97.01: A force F directed at an angle of θ above the horizontal is us,-mled cghxr,* hfs39ed to pull a crate a distance D across a lhs *h-c f39 e,mx,drglevel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass p )ml0pf1 mh +3dcsq(q8 )imbfm, which is moving toward her with horizontal speed v. While bringing the i c)d(sf1pm ) mlh+m 3bpq08qfball 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 * d,:pkibg+zf holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these fk:z+bdg*ip,4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blocm.nqr4zs (o 1bk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enem4(1qsn bo. zrrgy 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 u1j7 k k3yl8oqowoew. 6niform acceleration on a horizontal surface for 5.00 s. The block’s kinetic w w61qljo.okk83ye o7 energy 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 tgn6k.d,p( mg:7baex8r;oj u so the right is exerted on a 3.0 kg block for 5.0 s. The block was iouxb 6; j r( 8gp,.ndk7agem:snitially 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 bson4;s,tu /t to the right is exerted on a 3.0 kg block for;s /btso4ntu, 5.0 s. The block 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 initiaybc0xh i3 y4ts2xw12nzl 69 fjlly at reston a frictionless frozen pond throws a 1 kg hammer in one direction. Ayj 0b1xyxhwt96zc2nl if s34 2fter the throw, the 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 kinetic energy. An hour after the fb2ltyhbq pqu8g 5/2s h63kkg,an has been 22 8y /qutgg,lk35hbqs hbkp6 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 position of 3.0 m, a *a1:u5b ech ez(7w cs6sn1idq speed of 4.0 m/6 b1sdwe s nhcq7(za:e1i5uc *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 isy3c./;55yahywc y5 yhv96 a ueveq;dc on the middle shelf in the bookroom 1.3 m from the floor. If the j;5 y/dvcw55hh ycu9cy6.y y3e av;qa eanitor relocates the box to the 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 32 horf1kee n( 8: (ffav-clxsepower) of power to a car's dri(e k- l:xvn8efc1af(fving 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 the /wazq;n/l bll- lh.y,3m d .fhright, 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it 3y.h almh,l-nl/ zq/fd.b;l wreaches 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 5.0e7ghzfq1dxeox rf80;g+ p59 h ( d*wmt0 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 th h+( mg;rg8q1f7 ozt5d x*ep0hfdw e9xe incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the rig 2nm6t2-zxy8uaoyxj6 ht, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. Afteyn2a 6 -uzxty26j8mox r 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 interval guzw8nm8 i8 399 n j::geyusx;rd gy(rof the accelerat :yx snn9z jg3 (i:m9gu uyrge8wd;r88ion?

  12.08: Through what distance does the xf ttrn8 1r.3kobject move during the time interval of tht8 f3r1. tnrkxe acceleration

  12.19: The magnitude of the li o xxb0qh)zhp+xi.c ;)near momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time inhix)z.c ob) ;p h0qx+xterval 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 a6 j)p 6+hmdse9vgy(dits speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represh9y degmp6a sjv6)d(+ents the mass of the crate

  94.38: A force F at an angl hld7 fd8-6*khhu/o pbe θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant vel7up*k hh /bohl-fd6d8ocity. 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 exert2 c1eiq, twwna/syl *t;7qtz*v6w)bl s an upward force and delivers a useful power output of 0.10 w to raise a block v /1 siv*abc*tw) 2tlte;qqnl,7yw6zw ertically 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 euft(kz*)1jxyka 01 m 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 thetz 1uak m0(j*1)exkyf 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 azlas(f /6mzwt) lvy.) 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 tfw tl6)( l/zzsyv)ma. otal energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s.1tk*) 9 5bkcsruh wmy 318o8bqy6lv mc The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averow ub)68m k5c*9vky31csr1bqt8 ymh lage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until itp5-khln4*sxwofc7v;c /)l 8ycmk .r:vkpo m ( stops. If the ball travels 15 meters, what y);v(-5slcwk kppk.o* xo4/ c8nvcm:fml rh7was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kio67td 15c;q a h5j3zzf7qgqeenetic energies and the three following statem5g1j qz; c tz doe357q7fa6eqhents. 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 t g;;y 5emrhltuuo1a2pi+b )g9he air with an initial speed of 4.60 m/s. Ignoring air resisti)m u5 ;ag29r;gtl1po ub+h yeance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straighe tg86;fhqlb+t upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v an6qgel tbhf ;+8d 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 ground. The objftf,; n 8.ggm/ qw 8zp)hvw3uvect crashes into some soft earth and comes to rest by compressing thz fnfvm;g p883wtq,/h)gu w .ve 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 ground. The obfli:y 80lkcn-x 06z jgi.np9m 34ubemject 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 l:ijei08m- c .n y6 9u4nz0fbpgmxk3l acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidewaysgd)+*di s+pjdnup6e. until the cord makes as p j*+ug+ )pni.ded6dn 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 ut /:vt)x2k q2.xdeqmj niform incline of unknown angle. The sled, which started at the bottom of themk.qtxj 2qt/ 2v)ex:d 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-meter ramp t hi., -od9 rkkw zxfg(zgrd1qee5 9i92o 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 the cartons to move them to the loeo-i9fde,d( 1r q2 wrz5gx9 gih9.zkkading dock?

  12.16: A constant force F=50N (as shown in the figur 2:4ojwgv9deco2yn4sq,+brp.ims p8 e) is applied for the 6.0 meter motion os po8rv +sod 422bj.qmycn:i4,e pwg9f 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 droppedevq 0oz 7clw45:vd g3d 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 bal5d3 deqcw l:4oz7vv 0gls changing?

  11.28: A person throwsw2xw)u k +px5,ee,jab an 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. The person now throws an object o5e2+b p, )eaxuxjkw, wf 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 sp*szh 3u8jedk: ring that has a spring constant of 20 N/m. The potential energy storek 3zjes:*8duh d in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is thelx k2x5 pg24b,g -uglj tji:k1 maximum speed it can impart to t12 ug2-iklkj,g 4gxlbp jx5:a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottob/cw*4h9 uqg;d b y6 a,/nxe c pr.srvv-w42fsm of a fixed incline of height H. A person decides to push the object up the iu g/6c.a/4vwxs 2cq ;rybdvf- 9e*snwb4 rp,h ncline 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.