97.01: A force F directed at an angle of θ above the horizo kx**5aek:td6g 8:pit7 u nrg aqc;u5pntal is used to pull a crate a distance D across a g ;5pa d8ptr*i:6a5*ktnx7ce: gkuuq level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, dwo,z2)b xevdt/ij+ /which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves /z jeidbw/2)tv+x o, dback 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 wallboard 3 meter abnbg8yx -d,rl :ove the fl8gd:lrb - n,yxoor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniformy3 uv8a tf5o x6ey p6vff.igb n-+d3:b acceleration on a horizontal surface for 5.00 s. The blog8touvypn 3 6yex6b-3 iff a b:v+f.5dck’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 with uniform accele/ - (4cajrbqvfration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.f 4a b/qc-(vrj0 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 block fod .)v;se +tcetq6d(ptr 5.0 s. The block was initially at resttsve;)6e pd.tcqd (+t 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.x rs q6m*og*-gy 3l zf+1zw,dl0 kg block for 5.0 s. To-gr sql3mz*lgdf* y1wz+6 ,xhe 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 frictionless froza8 v9n7gvslbs )4x6 u)wd.p pten pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one div pwdx897.4sans6u tv bgp)l)rection while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the aixq2 2.nzkjptkr;l8r4,qp:- b (jt pwdr and gives it kinetic energy. An hour after the fan has been turned ofj.-nqjx8rpktr (zp w:tl;2p2b4, q d kf,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block rm9 , oradww.514giozpy w+m7of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration ofrgo+y5w w.7z4mmp1wi r9ado, $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in tckm5zfqk)k1./g *52 u qvgigqhe 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 mass /2gqifv)m*gzu k1q5 qk g.ck5 of 10.0 kg.

  02.32: An automobile engine deliversrrnp9sq.jhb+ c9-b98k( n*tlzy mvl hv,/ pu* 24,000 watts (about 32 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 for .9hy (rmszbbjhc9vp r- tnlpk9,8v *+*qnu/lce acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at t(h yqbhv3eao: 5+k egp5;d 7hjxlf4(ahe 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 ofF5(:yqa jd;v al7 e he3x(bhf5p4+go kh = 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 n 5+vu(tar:k lw7xt3 nthe 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 thekl 7+n5r(vxt 3: tuanw 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, along nv+t.gn qjr9d a2 3;h,z5og tca straight road. Ca+a jc3q5.g;9zr ,ttvd h2o nngrA has twice 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 force acting on the object during the time iqt*jfdmu5 *ed 5d8e;uai q.o 4nterval of the acceleration?f a;e*ji*o84uqe5. dm q5udtd

  12.08: Through what distance does the object move during the time intervo+ w9;ezxusm)c;r z:val of the accxc9m s o:+wvr;uz;)zeeleration

  12.19: The magnitude of the li7c9ps0e6f6s ; c;q pw3wuxgx dnear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00; dx6ppw3w0fcc7;9gxseq6u s 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 wld cnq*c8g7( its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices bedn8qcw*g(lc7 st represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used.vq5pq4ee101 y2kb bl5l lm cz57dvgb to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitlqq2ye1bvlm55.b 4 pl0 z gd eb7c5vk1case is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an 2fr/2gpamij4 ,. 07vygqrw ryupward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cran4r7jfg2r0wg2ym .pqi/yv, a re raise a 0.20 kg block?

  12.18: A 1.00 kg objeh+nhu0s e f2++yph qn:ct is 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 aysqh 0:h np++u f2e+hns it falls 1.00 mto the 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 a height ho above a hard g 8xwoh).6qb we m/z7pfloor 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 hei/mezg .6wo7qbw h)px8ght h above the surface?

  07.06: A 500-kg car is moving at y,,tqw,k uw2r 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is thewyruk ,qt,w 2, 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 it stops. Ifa.h9ragg e55g5(xg jk the ball travels 15 meters, what was the average net force applied while it was coming to a 9rx55 ke( ghg5jgg aa.stop?

  02.26: Consider two laboratory carts of different masses but identical kineti 9i3qogi)y*cy9tge s,1f xht-c energies and the three following statements. c-eqi)9ts31yyt f*o g xhi9 ,g 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 the air with an initial speut i,lcw*g7cx d(et;3ed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it re ,dctwil;g3tex ( *uc7aches its highest point?

  06.20: A boy jumps from rest straight upward from a flat,o1-u t 8jyfn;e 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 yn-8otu;f j1e 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 no:rv48i;yii 8 z j hq.xbz)d1object 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 e1i 8zi4: q hv);rj8 ybdzxn.oixerted 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 objec2izearrqe/l-ytq d3* q8w,)nt 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 acting on the mass during the collryqz2 8alt /r3ein)we- q,dq*ision with the surface?

  96.38: A pendulum bob mass mon a cord lxz5q)yt m )ffxsve( df9qn((0ength L is pulled sideways until the cord makzt))y(x qs( xdq9mn0vffe f(5es 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 incline2wp zq ka ir;(75tg:ia 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 s :kzwgi5 aa rq(7tpi2;led'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, al,wprrjuuf hi/f7m:bj)h9 ;e73h1gmq ong a 10-meter ramp to7ghwm hup71j93hq /j :,mfrre)bf;ui 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 loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appli h 9ycq6)gw urr1f-h);;nygdked 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 choices best represents the work don6)f;r -hhgcrnwuy;1 )dq9 y gke by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped fro4osu,je x q -v+abf.s)m rest from the topu -ev,qas)+xo.s f4jb 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?

  11.28: A person throws an object of mass M straight upward with an initial non1jxj(sc:lee ps*+ m) ajx+.g:9s8all ka m7hd-zero speed v. The object rises to a maximum height H abh+8xea1:xspg :m*+skj slame. l a 7l()j cj9dove 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 stretches a spring that has a spring constant of 28 9lmi(mm vk*9a r9arn0 N/m. The potential energy sto m9m (mvi n*a9k8lr9rared in the spring is:

  97.10: A compressed spring has 16 J of potential energymmi68yze2 6q z. What is the maximum speed m2 zy6m8zeq6 iit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixm/+- m :h(.ao levhoomed incline of height H. A person decides to push the object up the inclio m/ovl hhm. o+m:-ae(ne 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.