97.01: A force F directed at an angle of θ above 0u,-1vm47 )snn0jymc jpz haj the horizontal is used to pull a crate a distance D across a level floor. The work done by tcayv,pn4-jmn 0) h mj1szu j70he force F is

  97.33: A softball player catches a ball of mass m, which is moving towh(l9+)ffrp;kl*y 1f9ki lo cmard her with horizontal speed v. While bringing the b1 ym fhpl+9f(ok lci *k;9l)rfall 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 holk7 -4y,zvq qeeds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seco,e74qz k-qe vynds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform a;+ 8 i tmowohj7k3e;rwcceleration on a horizontal surface for 5.00 s. The blo7hk+ i ;;or8mewjwto3ck’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 wd;1uusqnz.q;o v w; x-f+h mdh5wy2; nith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this tiu z;x;hmw .;fq1;v+duhnd- o5ny s2q wme.
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 km2 t1k8z rt: :9oep-lnm(wlvis exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slzlk : 1-28mptltoewvm(: k nr9ides 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 scfwv(3z v3j/(9wh 4 algf0zl3.0 kg block for 5.0z lc/3v0v w(jzf l3s4aghw 9(f 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 initially at reston a frict:qf ) yzne8 2jizli3njmu/*; vo 6e-bcionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves 3c-nnvj;eqz ji/ 8uzm 2e*f6):oy lbioff 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 ;mm1 5e c)ovscthe fan has c s;)5emv1combeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a 9j6gihr ht, 5etn. (xublock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acntjh65u r9. gh xt,ie(celeration 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 shelf in thh yuixf16kb 8x82m7 zle bookroom 1.3 m from the floor. If 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 m82zhuxi8bm6 yk7l1 xfass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of xc rkm95 gzb7uz: 1v3x)rxa(ycbe5 y6jmx* *s power to a car's drivin51zg *e6m 7yjcv()bu smxcz :k9rxa x5rx*3ybg 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 right, a box moves with speed 5.00 m/s at the botxfqpmhs5qv42c7./8 po ew7rbv8iecxo( vt: .tom 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 =o2cw:8rhcm.v /4eevxo7pq(x tp 57b v8 fi.sq 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 the bottoj z(y *d bodjp;s6*;rsm 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= 2sdpj;;s **j6rdyb ( oz0.0 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, along a straigbutcbt0i4 l 5(ht 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 dista(i5c4t0 bltbu nce F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time inp w46sp)j 0ozu ebv7p5terval of the acceleration?b pes)j6uvoz7 45wp p0

  12.08: Through what distance does the object move during the time interval /ztve8:c) xkpns1se6 n-kv:j5 ahpi6 of the accpes:t-5pk: j n ve)i16/8ahzxn cksv 6eleration

  12.19: The magnitude of the linear moms*l +xbt(i 9jwe8j z1eentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0xj*1 89w istlzje(eb+kg.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 it*0 ny wh tunvf7yzj)m4/ohz gj45*p f/s speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repres y hv*gofmf4w)p*/ j0nujzy4hznt 7/5ents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to.nvv4cyzmtln;ub5;)* t gqv 01ve r6 w pull a heavy suitcase of weight mga distance d along a level floor at consvn c6n r) ;vg4 .;qtvzul10ywbe*t5vmtant 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 dyp bk9;dgb3w/z-yiet i - 0ac-wda,- oelivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise--y wa- 9tpei;kddw 3z0o, /igbc-ya b a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface ots6g2 .hh+ jjzmb;g6n f 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 th2n.+b jz;hggsm6j 6 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 heighrp .*u0it5rghr hc ,0qt ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one or*hc 0h,0pug5irrq. t f 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 barrier ahead. If tin5mcjy/.u3 2rjh6fj he car takes 95 meters to come to rest, what is the magnitude of the minimum averag2/ 5 6rcnjijj 3fymh.ue net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows downzyk p/f-vqvk;v(l)q : uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comi;k /vz(y)-lvf k:qvqpng to a stop?

  02.26: Consider two laborato-8 y1ptdk+m j:izlp 5cry carts of different masses but identical kinetic energies and the three following statements. Whic +1c8d5-ijlmy:z pktph 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 3la 3n6ub ots)clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change innl6 3)3 asobut its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u vlpb734b 8org c9ld o6;p7emhlttk+uz q7- s:pward from a flat, stationary concrete surface. The boy, of mass M, leaves the cot b7g qhzeu77k96mpd3 c8bl+otorpv l 4sl;:-ncrete 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 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 1o6jt(bs fon1 g jr62/x:y us/po ypl9the ground. The object uj b /xno2p:o 6g/ls1yrys(j1fto69pcrashes 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 while coming to rest?

  12.48: An object of mass M is dropped from aheight H abohlmso8 5 ; ro: 0gzb)l6;xtlgmve 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 averageglm; lo bt:) holrm6g s8z50x; net force acting on the mass during the collision with the surface?

  96.38: A pendulum bo+/i c c(uawie 57ro)irb mass mon a cord length L is pulled sideways until the cord ri(io w 5+/ia)eucrc7makes 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. b(26n+oa ld:caxdf 9w 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 2bloaddac xn(+ w96:f 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 1vn e8ek.k x;-n0-meter ramp to a loading dock, which i; n8en.kxk-v es 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 figure) is app: yj(6x0zxy l4 jnd :9ql2lyzzlied 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 ch ylll 0d2yn9z :4jxyq6zz(: jxoices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are jkx)x.k,p;*d az+)tvvhp-6v z *rxujeach 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 *u jaj-xz ;*)tk xp6.zxdhv +r)vv,kp strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight fgipk8 bv 6aay42wa/h4 f8po)upward with an initial non-zero speed v. The object rises to a maximum heighv6)f o agh8wy4bia8kf2p4a / pt 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stret pdt(khkx+*.i ches a spring that has a spring constant of 20 N/m. The potential energy stored in t.xkih+(pktd * he spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxim4 ,bphqf; vbw6c 7/kdqum speed it can impart to a 2.0-kg obpdqc 7;wbb vqh64fk,/ject ?

  

  10.31: An object of mass M )hi+5lkbp7 j y 7; nc9rzoewd,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 the work done by 7dob)r; 9pk+5nc7 w,ljzyhiethe 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.