97.01: A force F directed at an anglsohj,*w,yrrhpy 5 x,2aj44d ee of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by ao *er hy, rd2xh5,j4,4pyjswthe force F is

  97.33: A softball player catches a ball of mass m, which i/r6s6/ x7qm jf*0ii7sxh j-wbgvwc z5s moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant decelerationvcq0 7irfj/5w/b- hj i6xsx6*sg w7zm, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sh19h / b6 tpssspof:e4weet of wallboard 3 meter above f6sts 1 4o9s:wb hpe/pthe floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratiuxr an9+l 92faon on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50a2fa n9l+ urx9.0 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 wik,qjd8 )s5iex,yg*t f th uniform acceleration on a horizontal surface for 5.00 s. The bloc)jd yxk,te*fi85,g sqk’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. lh4fmr ;,m3du0 kg block for 5.0 s. The block was initially at rest and slides on a horizo;3h u4flr,dm mntal 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 too4kpblrijo5d6r ; oc4a(,n 1h the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slid;,nio4rdl(b rj15 cok p4a6 ohes on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student ini 4isx6;e8piv :mm+yu gtially at reston a frictionless 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 ix6ms4uiympv8 e: +gi ;n the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows tr4d0co) f 5b-dgz 4riz3 4ochwhe air and gives it kinetic energy. An hour after the fan has been turngi-zw4cd3 cr40ofoz)dh4 5 rbed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg ha,+dp o-yc4bw ks a position of 3.0 m, a speed of 4.0 m/s, and an acceleration of4+kwpy-d oc b, $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks.m yr9p.cqp;m is on the 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 m. ;.pc ypqr9mdoes he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine7pr 4nq ,02+rqufhhxx; m9jw-vatcl + delivers 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 +2jlxnh-4c9rmx t ;uqrah+7,pfvwq0 retarding force acting on the car?

  09.13: In the figure to the right, a box mt;al1xl nxw3 / y,gi:gkv*0 ;)encasooves with speed 5.00 m/s at the bottom of a r*vaaln;clx3g/o0,eyn ;1tkx :) gwis ough, 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 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 bottov ju9amqchr4sci r-rc:)-+l 6*br1iim 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= 20.0 kg, has a speed of 2.50 m/swhen it reachs9j - vrr)ccrq i4:+lha*6-mu1cbi ries 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 righs j zaaujsn/94sonzx4 s0e :(5t, each starting from rest, along a straight road. (:jnjan/z 4us sssez4905 oaxCarA 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(wd0lk+ h,r3 .,0fwqd nlnask acting on the object during the time interval of the acceleratflsrn 0,q+h .0wa,n(d dlwk 3kion?

  12.08: Through what distance does a7x nuc;x hyngd),05tvxmu- 1the object move during the time interval of thvn;75yxn )-cmuh gt0, xu1daxe acceleration

  12.19: The magnitude of the line t);tt*hw2j xuar momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time intervalhtujt w t2*;x) 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 ef7dme8a: c/o fe xh9.rnergy while its speed is increased from 2.00m/s to 4.00m/s. Which onemxe/: hof7rf.a9ec d8 of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to yj l 90yr:lm.gsda,z90.i qgkpull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The workdyr gjg0qz9ak .sm i .:0l9,yl done by the frictional force is:

  14.31: A toy crane exkcx s)nl/t9y57wr lpo-zx( 1s erts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant z)ylwrs9nxo1/ptc 7 sl-5k(x 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 ne3h5n:f5l1mt5zvax ased ; c6gar the surface of the Earth, the gravife55xv31 c g5z6d:a;t m anhlstational 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 gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionlesskkj*l f+:9y ,vjzavt3ryv 9 41bbxuy* a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the followin* b,9tvy1u+l:zb k a43rj* 9k fxvyyjvg 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 (v h:f.clu,q5ob gp5fmoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to(uv,p 5. c hfl:gf5qbo 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 dow-t.z*upkq b0yf /cg) rn uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a */q ytrk0z.)-bgf cp ustop?

  02.26: Consider two laboratory carts of different masses but identical kiq8 m1m8duog.v netic energies and the three following statements. Which of the above statements would be c1qd u88go m.mvorrect?
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 t) r,diwaa*,ozr bun53 he air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chand, ui ar,wb z)n3o*ar5ge in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight uetwv;r - s.(uupward from a flat, stationary concrete su;ut .sw u(re-vrface. 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 on the boy?

  02.48: An object of mass M is dropped *u t + e0.ygdxr4g 4q8rgkx7cvfrom 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 air resi*g 4kr ygrx748cv+t xqeu0. gdstance 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 maf ;;u(iy4nzwl1p0 nbz7tkl 1 ass M is 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 the average net force acting on the mass during the collision with zuwz(1plb k7 ia; lfnnt4y;01the surface?

  96.38: A pendulum bob mass mon a cojs2k 4 ;+n2ki5mw aw.lmou.d op :8uugyy qu33rd length L is pulled sideways until the cord makes a: w;.u3mu. oa24g3k2q yo5s+ ujum lypnwik d8n 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. The sled, whiwjm q3)wxo+3uch started at the bottom ojw3+xwuom q)3f 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 bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 1/uk :c,ec px87pr-tn h 3 hkz-z+9rgeb0-meter ramp to a loading dock, whichxhg3k pc,n ezkb-:-re7h/+8u9 z ctrp 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 applied for the 6.0 me1a t ki5j5p25qc-eywa ter 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 pej w 55kcqyaa1-it52force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from th0lo;*. wn qjx ;9qlkg 0xh*lzve top of a tall tower. Ball A is lvk.0q;*xll hz w;nq ogj*90x 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 straighy 6sazd1c6*ytt 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 straigh *6ytys1dza6 ct 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 splf4 ef of .(cx9a) wvp9:yne-wring constant of 20 N/m. The poycwe-)lwxf. f 9 (ao pv49f:entential energy stored in the spring is:

  97.10: A compressed spring has ka4 v;qgdy+a316 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object ?3g4kq dya av+;

  

  10.31: An object of mass M starts from rest at the bottom or kuv3f0mcxwb/3;7 irf 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 i 3;7/wumc0 rk3 rbvxfof 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.