97.01: A force F directed at an angle of θ above p4m(,r7pu57n gp zqrvthe horizontal is used to pull a crate a distance D across a level q,pg754(r 7mvupn z prfloor. The work done by the force F is

  97.33: A softball player d+3 7qplpfhv,z:g)hu(q.z fi 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.l.h qf(u)gvfp h 3:zzqd+i7 ,p Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of w29kt4gk*, t t:v dmdimallboard 3 meter above the floor for 4 seconds. During these 4 secondsho9i*2,:gtkk dm mttv 4dw much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration i )b3j: , sid6slj-)sqp guk-fon a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thisu-:s6p jgsif d3lb-j))s, ik q time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sligc 5c/xqqj ,5wdes with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 g5w/ cj5xqcq, 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 onos.m4jg,kc2) 1gjqid 9+a gep a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfaceagk qcgjm sg9dp) 4ieoj2+. ,1.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net mu/h5z h9e z3oforce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizon5z3e/hz um9oh tal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless 5 bk*xtpt*bhvs kswbj:366 9lfrozen pond 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 other dire3 ks bt9lwk bh*x*66tv5:spbjction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. xzwb/pj r3 3o.3ul 4u,pcd9yuAn hour after the fanyb3 uj3zcr3px o4d,9u/ .wulp has 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 position of t/da1u*u7bg/njukj1 h pd*x;3.0 m, a speed of 4.0 uuu1* ntj *;gd/jda/xh b1kp7m/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 midd:qocfmwkdml, - yla +f-m 60(xle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, howlxo+fq lmma(kf- 0c,y m:6-dw 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 qiv89wjtsctrjm/lmm r1y9, r 520 wk 032 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 retarding force acting on the ct5 iymr 01k90jsw j/lcmv m9r8qwrt2,ar?

  09.13: In the figure to the right, a box m0 rh1.ryl-q ss 6pz 8wd6nsjhh/n0r1,tu9 pqooves 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 ls1u hj,6n r-o0h6h rpny/spq9t.s0 r zwd18 qspeed 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, af)nxxu)d6v1z 8 ku o.:s-opb5z ky,vx box moves with speed 5.00 m/s at the bottom of a rough, fixedd.pn )uv5-y6:zo1sbku) ,kz 8x vxoxf 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, alobka ;a:r (ts:qng a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When q:(k;bts aar: 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 obj-.j)l3o xhyp;yk39wq n/ jbbg8p oy+nect during the time interval of the accelera3bo3/ 9n.wj- +pylqh o gk)ybp8nyxj;tion?

  12.08: Through what distance does tr1(s0 ckyf c0t.h 69.eq igbvuhe object move during the time interval of the accelerak0gcvstyh 90i.( 6bu c1erfq.tion

  12.19: The magnitude of the linear momentum of a 4.00 kg point ma91 lhoacibs4m0+5bwwss is changed from 6.00kg.m/s to 14.0kg.m/s in a time intewoal54b1 m09 + cswibhrval 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 iq mue5m2 wqan1,rr;i3 5g al)pts speed is increased from 2.00m/s to 4.00m/s. Which one of the f) aepr3,5 u15wqrgqla n2m;miollowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to p( refb8m; gd-sull a heavy suitcase of weight mga distance d along a level floor at constantrg -fe8b d;(ms 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 usefuhrn ),/7w smjul power output of 0.10 w to raise a block vertically at a constant speed. At what cons,suj )/w7 hrmntant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface q(3) 8: ,poliwf gzqjaof 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 the ground, which one of the following choizf8oqipj:( w3 l,a )gqces 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 i q*o.dsxx+rc2s held motionless a 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 total energy E of the ball and its heigd q2 cxo+r.x*sht h above the surface?

  07.06: A 500-kg car xark,-bjy+t 5us7 n 0iis moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meiurj5,k+a7y x 0t n-bsters to 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 until j 2p7117pohm1nm+*pqxs zwxrit stops. If the ball travepjz wr7 p2omh1q11xp7+xsm n*ls 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two labor. jnszvhv* qz0amv2d s3 -th7,atory carts of different masses but identical kinetic energies hz3av0qssjz*m2v .nhd7 v-t , 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 of clay is toss0 k3 je nmo km6r96an 8axi3oyp-x5b8led vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when njbx -x 0a93 amneo3m6 kpok8ir6ly 58it reaches its highest point?

  06.20: A boy jumps from rest straightqvq no, x7tll2kg(0 a5 upward 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 distance d to the highest point of the motion. How much physical work did the average normatglqokl xa0 7q,v5(2n l force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is droppe( wjx4g9b6mhb,lb)7 d tq6ev xd from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that aiv 97hxj()xwg b6mlbtbe, 4qd6r 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 i1ilta izh0/be 1qoi.2s dropped from aheight 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 the120it.i 1h/qal boi ze average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass6k:tqmwgw / f+ah tqfsk(n;5- mon a cord length L is pulled sideways until the cordhnk+t6qs fwat:; 5 g/( fwkqm- makes an 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 uniform incline of unknown angle. 4k,i sh-zqmj/mmfa5- 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 returns to its original position at the bothi m--/za5fmq4sm,kj tom of the hill?

  06.09: A deliveryman moves 10, 4;f,z 0ccjv cp5cdlj cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters acpcvfjz 5c, j0dl;4 ,cbove 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 figure) is applied for the 7; nu ap4mvx2y8 gwzo -g-5yhl6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the followw-a gz-2m 8y7 45gxpunv;olhy ing choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowl:x)*mq 6alvw 2j6iswu6v 8klwing balls A and B are each dropped from rest from the top ok u6 qwsvamw86i)j6 * vl:x2wlf 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 an83ixjjazm/*va f.1i qah -6egb8 7e jy 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 o68byfv aaai j/7xgjm.*h i-j zeeq183f 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 t) a7eg7(r h hjvd6+ hiv4rbbx(*llpn 8hat has a spring constant of 20 N/m. The potential energy stored in (6lpd8hh(be*4nviv+grbr hx77alj) the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the ma2o0pn8 hg nr,( yr-xo ,-r lygzysx1b)ximum speedx 2--yl0 por rby(h,,yzr ngx18nsog) it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts froan uc)z/q my ;xh,:rl*m 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 the work done by the person on the block compare for the two trials? Assume the same constan*r axcyhql, zm/ ):;unt non- zero coefficient of kinetic friction between the incline and the object for both trials.