97.01: A force F directed at an angle of θ above the horizontal is;wd ryl 5a;svaua+u+4 used to pull a crate a distance D across a level floor. The workaswl+ ;u a;vur d5+a4y done by the force F is

  97.33: A softball player pw-fn7u,5cbo catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a diso7b u-,n5cwfptanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 ku)3b5fygtt7ihrc9, swo; h5niix/ .y ilogram sheet of wallboard 3 meter above the floor fobuttxiy9hirf)iw /7h5y 5 c s3g o,;.nr 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sbnr- .w 20 gmzrh4v-9eazuj ;w0j 2cyplides with uniform acceleration on a horizontal surface for 5 zb4erc9un22 -p j- .jgm0yhvwwa;r 0z.00 s. The block’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 slidk4s s4e6lqbxp 2q mi9)es with uniform acceleration on a horizontal surfa2 psqeil b)4m49xq6ks ce for 5.00 s. The 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 blochdso5tdd ;y8z * s4zvws:im89k for 5.0 s. The block was i ;d88 *:svz 5dzs9od tw4iymshnitially 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 rightuj *,dx2 .sh;,nqnt.sy1boxftcsx 87 is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfa8j sxfxuq1byt2t;*s snhcn ,, .7.xodce.
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 1 kg hamdkx 2 l+ibzo9k-7*ha mmer in one direction. After the throw, the hammer moves off in one direction while the studentmlbki7x-a +z ok2dh*9 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 the fa dv379u ex0zz jhe7tq,n has been turnju zvx 3e79h7tdeq0, zed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bloc fy6cbv3pek1ooe88 -qk of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerationop8 8be6cey-vk f o31q 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 bo om/.1(w wb t-azd0skcokroom 1.3 m from the floor. If-d( b0 zwa1m/t.kocws 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 kg.

  02.32: An automobile engib* :vt/zj*5/q nso myl)r5*hq ;ugz sbne 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 retardinglqbv 5u/q)*s zm:s*ogyb/j h rntz5;* force acting on the car?

  09.13: In the figure to-xm3zen qf f8/ 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 ffx-ez/m8qn3 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 bow hp hovf+7-u0x 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 the7phw u0v-h+ fo 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 c(5j xcqts p:fnl*w// +tn)tfthe right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a cwt )t5x+pft(:s/ fqnlj * cn/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 acting6rxzv p.k)e+bzfv8*c+9 xng s,kjz8v on the object during the time interval of the acceleration?kxcjk,s+ 9 v .xfrvv)z *bg 8zzpne+86

  12.08: Through what distance does the object move during thet .sx:l;hf, nilu0 pb4c, 5zrg time interval of the acceleratio ,utrsf04zln:l, 5 c.g x;phbin

  12.19: The magnitude of the linear momentum of a 4.+qigf agp76/ whk8zq-00 kg point mass is changed from 6.00kg.m/s to 17qh6/qki g- gw8p+ zfa4.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increasx9jy,irut- hk,w /h9ted from 2.00m/s to 4.00m/swh 9ihj ru,x,ytk-9t/. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an lyvu2i9m g5j p39 ax3n7qhd 5gangle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. Th9gxludv 9h3gy2ajm753i pn5qe 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 upwawos0cya+k3d s 7a ,j2frd force and delivers a useful power output of 0.10 w to raise a block vertically at a consfod ack 0+j3,y72sswatant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released z:8xvc tgcy x6c7n8kl*e.d;g . f2vmyfrom 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 mto the ground, which one of the following choices be;8gyc68.lvd m7c.y 2vtc*zen:k x gxfst 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 hamt pho;h b 0*6x:aqpip6sn u /cumx9(5rd floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relation ica;0/opxbn p *t(h 6qu :mm69puh5sxship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 mik /8lz 7yfib0i)/6s5ajwn s s/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force nece /6s 8jwi y0/nb)issaik5zlf7ssary to stop?

  00.26: A 500-gram ball moving at 15 m/syr (o7tt n,ph /kyd*u t2os4q0 slows down uniformly until it stops. If the baly4(o y02t*q prk /7t,hosunt dl travels 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 idenlb2puc*v6u .vi2k o5(8cry eauf/ z w0tical kinetic energies and thezw c*rv fk522 . uu0p(/8b6iacuyoevl three 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 vertically in the air with an ini(2kte qi95nqnm w mp+j39o m6etial speed of t em+q 6knm9on59i2e( 3qw jmp4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest strhlbx*/x)yvu ((,wbqv aight upward 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 the highest point o(w, qvx u/bb yv(*hl)xf 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 masszurfg(w4 uw/*d lp: y0 M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2g*dl/u pz0 w r4:ywf(u. 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 dropped from aheight H above the ground. The ob gjqvap0k w1/8qkh71g ject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maw0 h 1q gq1avpkgk/7j8ximum 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 boo-p* v-vg7,fj yse i2-1dkkxeb mass mon a cord length L is pulled sideways until the cord 72vx,vf*y -j-oegkdes -1ik pmakes 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 inclitye d6xn;j+l5 ne 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 posilxjd+5 y tn6e;tion 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 cartonsb xzb:s,y;,zas e0*q:fb0ii x from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters bbei,s;:bz 0:qs 0,*if yaxzxabove 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=50g:8ijots b md// gq.3qN (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 bem8 :gsg/t/3 jbqiqod .st represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are socll7/) hpv o,y2hc 1each 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 befhhl ys7voc 21 opl,/c)ore 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 c*w;ke5o3fq v(l4 vkian 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 witlf w* ovkvk;iec4 53(qh 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 :fly4mr8a b0w6f*a/4w hkrkv a spring that has a spring constant of 20 N/m. The potential energy stored in the spring i4r80 f* bflayh/k:warw k 46vms:

  97.10: A compressed spring habzugx c, wu-+1o+gb* hs 16 J of potential energy. What is the maximum speed+uguc1xgb, wh -bz +*o it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from resv hsn5g+4 ivdhg; 7m0it 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 thegdh 75i04; mnhsg+ vvi two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.