97.01: A force F directed at an angle of θ above the horiajr8te.8ny mt x,3k9n ;n/-f4rknhctzontal is used to pull a crate a distance D across a level flok jrk tm4na83rytn,fxc; ne8. tn/9-hor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is fj/a9i wc ) 8ug-uf/, j fmit55*ozduhmoving toward her with horizontal speed v. W,5f ouag/j j5ziw9ut *m 8dhuifc)-/fhile bringing the 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 labod+) ,:9rg,bje c 6csriwj(qlfrer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 wc9bj6 f(eq)lrr, jdcg i+:,sseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontj6x4kl5y2k4zzwtnk6r f 1,uiux 9 qs3al surface for 5.00 s. The block’s kinetic energy strictly decreasf3sk6,9ixqz1 4 z65nu rl 24juktkxywes 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,2fwz e:rt4qe2xtl. *c il5vi uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 wi54xe:tzt ql,re.cv2* ilf2 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 z+)kokua6xwq3t. m -hright is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides k+x.uhwz qt 6 m)koa-3on 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 insn96 izhef1y 9atm4, s exerted on a 3.0 kg block fort , f 9nn1iy9z6eash4m 5.0 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 frictionless frozen pond throws a 4;.;yvsn/ cn cm vq4wi1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in th4nw cnim4/;cvv ys;q. e other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows tprg,y */ c*c ruz24tgc/jlk+ihe air and gives it kinetic energy. An hour after the fanzy*li/+cpcju / k4* rtc 2gr,g has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg 9k0qz o liu 25d,.tcfwhas a position of 3.0 m, a speed of 4.0 m/50ui dq,zlo.kfw 2c 9ts, and 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 bookroom 1. bzj)jf n urx6x t0e+;q.q)zub 9j;qh-t*j8m a3 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 of 10.0 )-b*8jurh ;nqb 6j9tjqjz)fx+ t ux;mqaz .0e kg.

  02.32: An automobile eu uux bwt-r+*3ngine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a 3rwbuxu* tu+- constant 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 toin)ot4d 57mi y-cz-g hp7elj3 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 accej gp t4-chl-oniei3mz775yd )leration 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 tl6 g +-huo-jkbhe bottom of a rough, fixed inclined gu+ hl-jo6bk-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 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, eac co(pfl uq21b8h starting from rest, 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 spee1p lco(buf 28qd in terms of B?

  12.07: What is the net force acting on65tevu( b-xxf the object during the time interval of the vf xte-56ubx (acceleration?

  12.08: Through what distance does the object move during the tion0*18 dxwdzr::oe v kme interval of the acceleratiowd:zo :0xon e8*1kvdr n

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanunx h b.tmj x9483xre4r;p:sfged from 6.00kg.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 intnbx9rm.8 t ;pje fx4xr4hsu :3erval?

  14.11: A crate gains 36.0 J of kinetic enpdgf*6x p +:mhergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass *:6fm hg+d xppof the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy sp0lwpg lr2q32nwl * :p t.lwn*y7rd)duitcase 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 work done by the frictional force np*0d.dry 2lqw l *p7) g:w tllp2n3rwis:

  14.31: A toy crane exerts an upward force and delivers a useful powerw y u+15yv-kns output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this craneuwy-5 1 ykn+sv raise a 0.20 kg block?

  12.18: A 1.00 kg object is released+ga 8soboc ah6 v1r)x4(d9mo g from rest near the surface of the Earth, the gravitational force actinh4s xgavo)8+c6r1a o9(g odb mg 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 motionlessjx)yh 8wdd+ f*x. goko: c;e:y a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following gf;k.e h* )g8:+o:xxdyjy codwraphs 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 moving a gt4 *wk()rnktt 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to reskt*gw( k)n r4tt, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mq/nr. qeyxzc(:f-1tcoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what qt-fr .cnxzyqe(1/:c was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of 3 lb0oim o*k7pdifferent masses but identical kinetic energies and the three following statements. Which of the above statements would be correct? 3* om70kb lipo
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 vertiln/pq h;9 7i itpl2n6s)p) wnhcally 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 its;p2ih)9/ psh6 qnpln) lwtn7i highest point?

  06.20: A boy jumps from rest straight upward from a flat, station,l+qh* :*awv bonks(yary 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 b(k+olvn*yawqh,* :s 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. Th r9)1 fjeujqn:e 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 the object while coming tn9qju) j1f:er o rest?

  12.48: An object of mass M is dropped fty q .)q,c98dsn1nnmge ung.;5mn0mdrom aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then 9n.g1m)u;ytdg,8n s cm. mnqe5 d qn0nrises 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 len bg6rwzp7yxi -o5cw1 z,*2/zvxhjce5gth L is pulled sideways until the cord / r7hxy bz6 ,x*pzvz2ge-1j oi55cwwcmakes 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 unknowcpuag fo 5/u xh5ocl76f))2zln 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 ol7fpu )5cc 62o5fglxha/ zu)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, alondif3h-rz5 t7ri : foa5gkx/.dg a 10-meter ramp to 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 del3k 5f. ox 7rha:5grtd-f i/dziiveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as showfp eyy/s ::j 5x0byxa (1umc*un 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 represents 1y*:j(xbfp0u /ua y sm:e yc5xthe work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A ande6zl 4.-jju-fpi4 j g 9h(qjrb 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 bj6u9e4(bf4-.j gj ilqphzrj- all A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straigz7qg.,l-h.m 5d+b)z mkci6ycwty q9 w ht 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 7)gdibw+,m.ykyh 6 5qw-tq .9zcmclz 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 20 N/f828fr6br(e: ;va g llk(y hh3eutu9lm. The potential energy st r(lb v le;f8l2tuf a98g :key3h(hur6ored in the spring is:

  97.10: A compressed st(vyz, )ti ,y(r)rps tpring has 16 J of potential energy. What is the maximum speed it can (( syitt,rt),y)prz vimpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixe aazl4dn rwx w 5kngx2i5n ++o+kh)j4+d 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 i+nxdjha5+o4 )+45nklw+ xa zri wgn2kncline 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.