97.01: A force F directed at an angle of θ above the horizontal is 2v :x;md hlnu lbqs)+*used to pull a crate a distance D across a qux:ln;b)hsvd * m2l+ level floor. The work done by the force F is

  97.33: A softball player catches a b xm:su gz1s(x5all of mass m, which is moving toward her with horizontal speed v. While bringing the m5 sz1(xsuxg:ball 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 holds a 20 kilogram sheet of wallbow -a qywikf/a -28o/diard 3 meter above the floor for 4 seconds. During these 4 secondshoaw8qd-i/a- /okwf iy2 w much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with sh6ul8qs5tyz ijwk - ) k(xo00 uniform acceleration on a horizontal surface for 5.00 s. The block’s y- 8s0t oxi6 shk5jkqw)(l uz0kinetic 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 with uniform ac .:hg;.z-q ml5zgraicceleration on a horizontal surface for 5.-5rmzhig:.g .l a qcz;00 s. The block’s kinetic 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 to the right is exerted on a 3.0 kg bi neb7 s1w43jzlock for 5.0 s. The block was i7nj zi se43w1bnitially 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 b k51501hn7dyxryuvsd5 e o2xright is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal n1e5 5ddyh7 urby501x kx2sovsurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frh,trn d36 z3vjbct9 33skq*dsictionless frozen 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 direction. Which of the following correctly describes the above situatj 36 tszbn dh9c* rt,33kvsq3dion?

  03.14: A fan blows the air and gives it kineticecuqec42:onb3k6 k sq54: bc a energy. An hour after the fan has been t qock2: nbca bqe4:ce465s3ukurned 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;nu2r jn8vr p7.0 m, a speed of 4.0 m/s, and aj8r2nn ; rvpu7n 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 t9rcyz 5js(ad ;he middle 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, how much work 9cy(ja; drs 5zdoes 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 horsepow1 s 1rfnd6suj5, y2jfuer) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abou5sf,1u j j f61rd2nsyut 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the rig,g48fx bew-kshb ggni 73o12iht, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box 7gonhgg ife 2bk1w8, b4x3 i-sslides 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 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 thes7 5kfmc zf) 1 -n(6znpyall.xgap6k5 bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the in)k75azclg5pzk( . s6nm1pay-xlfn f 6cline 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 fr1lkqnb(g(rj6p /3gm.rcu: kp om rest, along a straight road. CarA has tru1 p 3cj6nbk : (pgkr/.(qmlgwice the acceleration 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 forf (ax9jo/th.z ce acting on the object during the time interval of the acc / tax(ojf.hz9eleration?

  12.08: Through what distance does the objectd /v;r,ipboqf kr/7t8-jd .v z move during the time interval of the accejvk -/,rdtq87 rb; opvzfi/d.leration

  12.19: The magnitude of the linear momentum of a 4.00 kg p118x l,+voq w sg0rioqoint mass is changed from 60sgw1l+o qxvq,r8o1i .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 kinetic energy while its speed *+huqxl i+yahi5m0xl7t+a0g,f pm6 j is increased from 2.00m/s to 4.00m/s. Which one of the foyjf+la7 hgh+plx06q i,m5ma+ 0txu*i llowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavo25 : az-5eg , 1,nasztoaempuy suitcase of we:op2e- g5,mz1aaant,5 ous zeight 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 usefb sw5wlj:i7qmt leuz*7s6f0dj3 :6gy ul power output of 0.10 w to raise a b7:q30sy msfbuw:ize*l l t6gdj7w5j6 lock vertically 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 released from rest near the surface g(q:v tkq)*3j l.pfj,op lbs 2of 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 choices best represents the amount of work done by the gravitatisq3:bjv (g.,lpk* l ftj2p)o qonal force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motioju zd 0mvwa,9 /9k i,lmynzfcg/g-w6/nless 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 height h ab, k/f, w9 //-ncuz6ym9alv0 gjwzd migove the surface?

  07.06: A 500-kg car is moving at 28 upo+.59djk6,0e xf4zvdhm d d m/s. The driver sees a barrier ahead. If the car takes4fdvd5e jmz d 9+ o.uhxd,k06p 95 meters 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 ,7 znm5y -bpk7vwuw2kuntil it stops. If the ball travels 15 meters, what was thp5wky-bu z 7v7mn,2wke average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cw*ip s+8pff4 uarts of different masses but identical kinetic energies and the three fpsi+ wp8*4uf 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 clz8lc *y1den: n n/l.kqay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ener8l:/en. ny z* qnd1lkcgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary lbch5 gapp0tfh:8k )4concrete 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 normal force of contact (N) between the boy’ s feet and the concrete do ck0tbfp8l:h)ap hg 54on the boy?

  02.48: An object of mass M is dropped from aheightH above the (0d nh9tf3sic y ;yrvn*j-;xhground. The object 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 thesr-n0y9;ct;dv(ny f3jh i*xh object while coming to rest?

  12.48: An object of mass M is j) x d+mql,xs;pu ;vgh d):co+py89bbdropped from aheight H above the ground. The object bounces p )dy bvlsh+;umpc+ 9gdq8x:bj )o;,xoff 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 acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cor pb-wj+0q l87gqhcx, zd length L is pulled sideways until the cord makes an angl ,j7g0qpwx blcz q+8h-e
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. The sled, whic;,6tg yc zaii:h 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 sle6izcay ;tg: i,d's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidg6n6u96;1tdq dcog puewalk, along a 10-meter ramp to a loading dock, which is 1.5 meter6dc nq6u; gu9d1 6pgots 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 applied for the 6.0 ;ij(5 qbng. uvmeter motion of 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 mot (in j;qu.5bvgion?

  04.48: Two identical bowling4kt8 ,m;t d aw+kykvd.-r gka: balls A and B are each 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 strikes the ground, how are the mechanical energies of the two balls changing?g kad.t;r a:vkytk, -4+dk m8w

  11.28: A person throws an object of mass M straight upward with an initial h+lzi.cw 8,tmn9xg d8 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 spwigd, + .hmlc8 t9x8zneed 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 ayr -ekkw48h b(+amu.i 42oogj spring constant of 20 N/m. The potential energy stored in the ko -(i 2og .y8e4rah+bmjwku4spring is:

  97.10: A compressed spring has 16 J of potential energ ,vsn 0k01 u ;fo/rnkvdhf8(dry. What is the maximum speed it c;du sd/rh 1nkvfrnf(o08 0kv,an impart to a 2.0-kg object ?

  

  10.31: An object of mass M s -6szyybg)9 sytarts 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 the person on the block compare for the two trials? Assume thesy9 6ygyzb )-s same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.