97.01: A force F directed at an angle of uvp e;nw ,w1z*ltgj9;θ above the horizontal is used to pull a crate a distance D across a level floor. The wop z*j,nw;vteg;w1l 9 urk done by the force F is

  97.33: A softball planx8 h6zg4uw t4z7 ooz,yer catches a ball of mass m, which is moving toward her with horizontal 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 hanzgnx7u64h w8zo ot4,z d is

  99.14: A construction laborer holds -0f)g5jez deu - bdiz/a 20 kilogram sheet of wallboard 3 meter above the floorz d ieu e0g/)d-5jfzb- for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform zubjap1m wo5l.o-k:f z dxf/s6,s(,q acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J wz(/ubf soq-mz:ol5.d , f1ps,jaxk6 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 acceleration on a horizontalj:unc+ qd-r c ki9;hy) surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Jukq:;cn -y d)jh +9cir 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 the6b:aw+xgz+lamaz ani: 7 h04c right is exerted on a 3.0 kg block for 5.0 s. The bina hbagl6:+mzc07:x4wa+ azlock 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 blj(a - yfw-vb2:a/l6zhhgp2f aock for 5.0 s. The bloa a2:6fj-wpz 2(lfhhybgva/ - ck 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 frozegv y8s*woqf-0 n pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one dir0fowy8-s *vq gection while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the/x o3 w8w+)o.mvlcp1yjby-g c air and gives it kinetic energy. An hour after the fan has been turn)cvlwmy+c. /y ogoxj-b1p83 wed 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 speed o8yox;zkc 1 p* a,*yk-nqphkk5 f 4.0 m/s, and an acceleration oxo q*,ck p5 y1hk*p8-kk ;nyazf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle she* adur zqf2:kvefd*dnpl +efl4+7f *2lf in the bookroom 1.3 m from the floor. If affl:vdd*qpe +fl**z272n4+ rekuf d 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 box has a mass of 10.0 kg.

  02.32: An automobile engine deliver/ur y((5g +tsqte-da us 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car mainsed+ty q(a -ug(5 utr/tains 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 eos55fr h,l(q;m,ojf/ nts+s the 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen isoh(j 5of/e, t;5,s+m rflqsnt 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 tpfb +vb.+fbp p3p 13,1ov w ;rdavee3jccx+k4o the right, a box moves with speed 5.00 m/s at the bottom of a v orap p;.+ pbx1 13bv4f+p,d3vecfcbew+k3jrough, 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 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, awv 6f p+7q,h)nhrk .+zvxg xm+long a straight road. CarA has twice the acceleratio,r q +w+6x.pvz)kgxhvnm+ f h7n 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 ac jb ;3r u9/lm,dwxaae4ting on the object during the time interval of tlw da;9x4 ej ,/ur3mabhe acceleration?

  12.08: Through what distance does the object move during t k6wfisf4lw-bj+m9 )x he time interval of the acce x9jbfk4+ s)iw -6fwmlleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is)hsueuwmgj7):jj 7 vv.,ljkye x m6+: 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 6uwjvevyj+ :7 gjl7sxhkmu)e )m.:,j mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energylxht:dyrh9jcc-a upt*v fv5fp( 99 -0e lhe;+ while its speed is increased from 2.00m/s to 4.00m/s. Which one of 99e(l; fpt:h9v hd fc+v-t0rc peaxl5ujh*y- the following choices best represents the mass of the crate

  94.38: A force F at an angle θ abo ((0h1ttjg olvuuepqr) * ivj)5 wel;-ve the horizontal is used to pull a heavy suitcase of weight5t(w0euorhq;( )llpvu-)* j ig 1ev jt mga distance d along 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 and delivers a useful powfi5osks3u e(rd 5z .ny.o z,bdfsx ;*(er output of 0.10 w to raise a block vertically at a constant speed. At what csd.d(y, zsx uo(ie 5 *3bz5snrofk;.fonstant 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 :m.zs-unza i3Earth, 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 gravitat mz:au -s3niz.ional 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 h 2 h:lt7)*qszmed sf r9j/xa4hard floor and released. Assuming that the collision with the floor is elastic, which one of the foljftl*qhh m:/d92r ss)7a4z xelowing 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 barrier ahead. wd-tmme7k f8l op:3+cIf the car takes 95 meters to come to rest, what is the magnitude of the minimum average net mo 8kwtc-ml:efd+37p force necessary to stop?

  00.26: A 500-gram ball moviny0 1dqfdzy)v+g at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force y0)+vzd d qfy1applied while it was coming to a stop?

  02.26: Consider two labor 0u36cmhnkvp.atory carts of different masses but identical kinetic energies and the three following statements. Which of 6p0nm3h.kv cuthe 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 th /kj+qxmyb(k 2e air with an initial speed of 4.60 m/s. Ignoring air re2/kjm(+xkyq bsistance, 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 flat7n-t,k gp fhm;, 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.p-kghf7;m ,tn 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 q04 hwcr ytir3zin/ a:9rxt06,nyb-d M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing thda ry4 3/trn0b 9xt:0rnhz ciiqy-6w,e 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 ahe;:f/gul3:dgso0 zk eql,m w9light H above the ground. The object bounces off of a horizontal surface in a cok/l:fd:gz w9ll s3eu , ;o0mqgllision 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 pug75 s6nknx)2m yi cex;lled sideways until the cord makes mx76 i2cn;xenk s5y)gan 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(mnd 9p7,k ;hevd;u mb up 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 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 returpu7dbn; dm ;9kh(ve,m ns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from g/s *u /u41;g5tggmqga d-ujgthe sidewalk, along a 10-meter ramp to a loadi4/gtgg1gjau - qg*/s ;mu 5dgung 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 force F=50N (as shown in the figf4ro7p +zn1fnure) 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 follnfno 4 fr+7zp1owing 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 bj:6 u+.as( q; 43iexufqhz ncthe top of a tall tower. Ball A is dropped one second before ball B. After ball B is droni(b3 fhs+6qz u:aju e4.cxq;pped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throwkgm4 agf1iq65 s 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 of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height d51f6 g4mkgiaqoes 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/m.x7,kv0jzq 9 vn5e(q f8 ur(qvi The potential energy svq e vu,fv79irqjx0 z5nq8(k( tored in the spring is:

  97.10: A compressed spring has 16 J of potential enecw+g 90p s z*,wph ;h u;b+eezpco*zq6rgy. What is the maximum speed it ca zz6;*9 ue;p cpg0cz+weh,q bo+pwsh*n impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from res7,h .hsbnldcw5mdv* 7t 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 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 an7l 5,shnmdc7.dbw* h vd the object for both trials.