97.01: A force F directed at an angle of d1k xa:4 hsgj-, ap-msθ above the horizontal is used to pull a crate a distance D across a level floor. The :,1sxkgjdph-a4 s-a mwork done by the force F is

  97.33: A softball player catches a ball of+t2d* n/fi cjj0rq07vhfwig* mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontalf*0d gc*nr7v0qhj+ jiw2 / fit force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 k( ldgo3anj6r8 tjij1+ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During thlojanjrg38d+j 1ti (6ese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelek(-1alrwvb 3zmv69f y*eac .m ration 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 tbmmayz- 6vw 9f*1ve( .clk3arime.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a horiza (ml g*f/(qd0ep:nt 5yji8yu m d3j)xontal surface for 5.00 s. T()(u fdgxneiap 5 3 yj08/l:d*yjqmtmhe 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 blo67mlm x-qxuq- ck for 5.0 s. The block waslx7- x6muqq -m initially 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 right is exe 9x 9( )xgppd6xn *vuj6u4pirkrted on a 3.0 kg block for 5.kxx9iupud9*6j)4 pg6nvrp (x 0 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 frictionledum*zfs:qzr0 5 i u-1nss frozen pond throws a 1 kg hammez0fu1nd m :uqz5ris- *r 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 situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after( bz52ovlykh .wb6te / the fan ha6yh/ .bbkowl(v t2 5ezs been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blocku dtg. *h/:dvx of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelh:/g xt.ud dv*eration 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 sheh4 kp4hyak6b:h+v-y : jecsj-lf 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 does he do on the box. The bokykysv-h: 6 4p-+jjech ha4: bx has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 35+ qjk kr-k6hj2 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abkkk6 hqj -r+5jout 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 5.04fcg *y4ejd rs46)y yg0 m/s at the bottom of a rough, fixed inclife*)gr4y6 gy4cds yj 4ned 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 m+x9jt, uol2wp8:iaaioves 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 +,8uloai9 jip2:atwx 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 r ihadgwdubb4 2 *.c 9ekw9f*c5est, along a straight 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 distance F, what is its speed incw 5*b g4uik .wdd*fa929cehb terms of B?

  12.07: What is the net force acting on the object during the tilyuh2 i*cm;(o.:z fsw4 tup4tme interval of the acceleras iuot4(ly;2p z:cu4htmfw *.tion?

  12.08: Through what distance does the object move during the time interval osi3+u :w4x)tws; ulcmf the accemcl) usx3i;tw4: + swuleration

  12.19: The magnitude of the linear momentx ejv,,k 32ug1 fp, -qltjm/naum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interv-fv1pktx,egln /, a 2j3m, qujal 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 is id:i *6c /jf; q8gqdebkncreased from 2.cq:fd i6k j eb8g*d;q/00m/s to 4.00m/s. Which one 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 pull a3wv2rw2b7d w(mbyx j0 gn/tr(qop /- z heavy suitcase of weight mga dmw(/x z2ytwb7(r rw/ 0-qd3bn2gov j pistance 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 useful power ou-- ++ )cdl.ciscvx.zobl e3 mstput of 0.10 w to raise a block vertically at a constant speed. Atcv +l.zl- c. x)s3be-+cs idmo what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near 53k.9sue zaiv 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 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 vu5.s 9ieazk3acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a he ,3k/fxpvcgru.(wjn6vz /sm8ight 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 above the su x/nr vcs6u/ v(m,jf3.pgwz8krface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrik6vt+ mc:abj* uv/1wiui90njer ahead. If the car takemu /ci:*vakj+061 v jnuti9b ws 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 mo 8 1ozl 8izpt n3dyxe:ncow*+5ving at 15 m/s slows down uniformly until it stops. If the ball traiptn3xw+n: 8oedoz*c8zl y15 vels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identetpcq jt;k4h(8, 9h vkhzqt)rgh5r .1ical kinetic energies and the z4p8kqt95),qh; h jv ge rh.(rckhtt1three 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 tossed v:l1ow-5:7t 9 r xktj/l: 7qhijlimhqmertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches i9jho j: m5:l qir177 mwq:-lix/ thktlts highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary -(m ,,g tnp-omml2 am(0sr:pq1wszv7;my obi concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a mo-is(;nqwzm : m,1-lmt0vry ,so2(g 7pbpm adistance 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 the grou1cc qx2 n:9e+(ojrxy knd. 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 averag9y qnokr:e j2c1xx+(c e 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 above the ground. Thl vk9w tis.k /)c,jof*e object bounces off of a horizontal surface in a collision lasting time T. The object tht j.,l o*s9/viwf )kkcen 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 cord length L is pulled sideways until thed) b: k0z-yghl cord mahk)l0g:-yz b dkes 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 unknn nbn7qv568 9 v.wu.froxyc p/ y0w8riown 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 startr7p./w rw0 xq9 vu8o 6in5bf.n y8vycning 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 10-mef2csoyo sng-*lu5g ;2ter ramp to a loading dock, which is 1.5 meters above the sidewalk. If e2gcs2ooy*; fs5u g -nlach 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 figureiu rp8lc +92c ws3ape5) is applied 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 t9 wrseip 28c5 a+3uclphe work done by the force F onthe box for the motion?

  04.48: Two identical bowling ballspo,5bb dy/e1 x 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 y 5bxb,/1 edpoball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mam ruozh uc(3-,ss 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 thruhr ,m3uoc( -zows 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 935x26 yh yb/aisgteaconstant of 20 N/m. The potential energy storay6h/3ag5 yxis9 t e2bed in the spring is:

  97.10: A compressed spring has 16 J of potential enot*+ rze xwg.u6) qut8ergy. What is the maximum speed it can impart to a 2.0-kg object ute w6 g)r.+u*txz8oq ?

  

  10.31: An object of mass q; kfr6 v;ke+sg544 bumnqa8v M 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 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 obje+v5u f6evbrk4;m nqg; a4qk8sct for both trials.