97.01: A force F directed at an angle93+*ld p1q(vi 3/qtxt q 8rwes5svr gh of θ above the horizontal is used to pull a crate a distance D across a level floor. The work dogti3 wv (v3*1qsr/8t d5 lr9spheqqx+ ne by the force F is

  97.33: A softball player caobl . 1dghko,)7tk5lo tches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hh 5go,oltob)1dk l.7kand 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 wallboard 3 mek5ba2sn1- q arter above the flo2a-sanrk 51qbor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hve42x 5 5zxbyhorizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this teyv bxx52h45 zime.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniforat )ib6gxo;c6m acceleration on a horizontal surface for 5.00 s. The block’s kinetic t66cg );b aixoenergy 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 3.0o)-e 1rcymyf6l u5yp9 by/.oe kg block for 5.ub6c5mlr yy f1. ep9/eyoy)o-0 s. The block was 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 exerv,by ;gy /kcp8ted on a 3.0 kg block for 5.0 s. The block was initiallyvgc yb/y k;p,8 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 inih kcyb2wd0uc6p b ,da+b7 t;c9tially 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 in the other direction. Which of ;utdy 0h+cb 2 , aw9b6cbkdp7cthe following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour aftn bxp+cy (ma60er the fan has been turned om +cn6ya xp(b0ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 d g:t:m9 j7)h:w ilys8 ze9k(n j9cccdkg has a position of 3.0 m, a speed of 4.0 m/s, anj7d8c jicgn9m:t:wsl9: 9c z(heyd ) kd an 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 the middle shelf in the c-rs 4o4q jnlv.*jy3mbookroom 1.3 m from the floor. If the janitor relocates the box to jnm.lcvrsy43 4j-qo* the shelf that is 2.6 m from the floor, how much work does 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 horsepower) of p 2fusrqt. v:i8ower to a car's driving wheels. If the car maintains a c q28 ifr:vts.uonstant 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;6 1y)h4ojwi2o tw vsu/s at the bottom of a rough, fixed inclined plane. The box slides with constant accewi1 ) w4y6voousjt2; hleration 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 totwij -*ida35c he;k/q--mlie the 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 the top of the incline as it is iw -*ic / jee5 l;qhdm3i-k-atbeing 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 starthwg(ky- 6yzh: ing from rest, along a straight road. CarA has twicey hw(k6 z-ghy: 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 ob8ta5 p 1al0semw t*5cyject during the time interval of the acceleratip c5m0aeaw lys*t18t 5on?

  12.08: Through what distance does the object move during the time interval 2 35mapu-kfxzmlm(gj)dq0 58ydf os1 of the acgpd(2 xfj1 l- zs38omq mkm)ua0 5dfy5celeration

  12.19: The magnitude of t n:z;a6v.k zqche linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time inteqkz6z.;n: av crval 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 ofv3x*. p wwxcf5ux)+duz 4ds)s kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of thx3usfwuv w4d* .z5) xdx)+p cse 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 a ,.;tz1mbbgc theavy suitcase of weight mga distance d along a level floor at constant velocity.bc b gz;mt.t,1 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 usefulgp,t.8dx dsh/6 8tvc y power output of 0.10 w to raise a block vertically at a constant speed. At what consta6hd8/txvt dy g,cs8p.nt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasc mza8y,mt8 ;ced 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 as it falls 1.00 mtmz ca88;tmc ,yo 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 hark7+ci m9eom+7z ,f dhcd 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 hei, 7+zdme+ 7mo 9khicfcght h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barriertbbi* -pw+dmp m-1v -ao 7m-ao ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force neces p-bi7pa*1vo-mbm t+waod --msary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows downcq v f*opk7ou0 hc0e, 46k-lvs uniformly until it stops. If the ball travels 15 meters, what was the average net forvpo*suv o4,c6h le f k7q0-kc0ce applied while it was coming to a stop?

  02.26: Consider two laboratory cz ur f;q1kf4 vd321 kit7k*tqm-+gmfwarts of different masses but identical kinetic energies and the three following stawq*4+m;rdf v1 1kkt72mz- 3 f qikugfttements. 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 verticalnnxb2 9f v9 cr uwjc,r7k.n7x5ly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentiaucx9rjvr9n n.f c5 7xbn7wk2, l energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u:k na2i)vg pi,pward from a flat, 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 t2ia vnp:)k,i ghe 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 dkq1*klqou2g xvyxr6),z,fx+ropped from aheightH above the ground. The object crashes into some +l2q ) gorxxk zfv,*xqu1y,6ksoft 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 droppeddug1saq ec: t:wu(l/ *qpw b7+ 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 collisionb7a*tucl/gw 1eq (uw:d:p sq+ with the surface?

  96.38: A pendulum bob mass mon a cord length L c8u36 lc(l :e)cqfmau(h) :wz 0uhiqdis pulled sideways until the cord mulq(ief( ml8zq uwc:hh0u )c:d 6c3a )akes 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 uni 3qv8wk* azzf9 g,, 2pfa)pdhjform incline 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 stajdaa8k9fv wq2 fhg)p,zp ,3* zrting 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-meter ramp thph;xj)--df -y eyhg7o a loading dock, which is 1.5 meters above the sidee-yhp7yj-g h-dhf ) ;xwalk. 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 foqi7kg/- w .y/m3rps fdrce F=50N (as shown in the figure) 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 repr- sw/k. mg3q 7rf/dypiesents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped 0k :1jpd-zfv m0j da,hfrom 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 mechd:f, 1h- 0 0vpjdmzkjaanical energies of the two balls changing?

  11.28: A person throws an objecpz3r eyn:h; 4vt of mass 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 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 th3h:;p 4neryvz e launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20ps66 . clx4wn3uy3iusr;sw7u N/m. The potential energy stored in the sprwsi w unpx u3l473 rys;.u66csing is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum speki/ bsn3tu2a.+ j p)qmed it can impart to a 2.0-kg /i jamku2p )b3.q ts+nobject ?

  

  10.31: An object of mass M starts frw u bvk9j5 ouku+z m++x8c2xq0om rest at the bottom of a fixed incline of height H. A person decides to push the objeq vx+u+jz5+ 9 8 buc2uxkmw0okct 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 object for both trials.