97.01: A force F directed at an angle wii io,-)p,m f ch ymrj/l;9+zjlxy9h*t34jf of θ above the horizontal is used to pull a crate a distajyz, yoj, 3ih4mp+tfxl j mli)w hc-f;i9r 9/*nce D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, ws nux:e6 *(,q tybzl-uptm6c;hich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ba6*t ex l6-,cz;tq:pubu nsy(mll by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 mete1pdl ,lo )cu.0ig,wzf1v5 eo rr above the floor for 4 seconds. During these 4v.r zp,5li1) f0clwodg1o,eu secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with unifomfdvj,yq,+ *arm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy s*a+d, ,fym qvjtrictly 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 slides z q9 h(gt4an6g with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases frog4t6z a9gn q(hm 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 block foisqo:q ip jfqb(,(/ ;yr 5.0 s. The block was initially at rest and slides on a horizoq(( qbsi/q j op,fi;:yntal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net for 98i2)/kgc-fyblvhvice directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horf9hv2yicivl g)kb- 8/ izontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fbzrns 3t19psp:* up 7prictionless 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 the following corrp r9*pt7 ppsb :suz1n3ectly describes the above situation?

  03.14: A fan blows the air and gives it kinetic eb1 4 pn6 (nqofi+kr(6c;sesnsnergy. An hour after the fan has been ns61+oe;fnqsbis4(rp nkc(6turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position o6dt:*tgpk gkg0 -6xccf 3.0 m, a speed of 4.0 m/s, and an acceleration ockg6gxt 0gc- :*6dp tkf $1.0\; m/s^{2}$ . 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 1.3 m frka;;7w1hlt+g,/e0w ram qhscom the fw/7a g hwstr1;;,+ h a0lecqmkloor. 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 kg.

  02.32: An automobilemqi)tniw2wsgi,5rh*v(0t j e:w9 e ;m engine 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 retardiwhqtrt(m;ew ie giv: j,)s5 *9n 2imw0ng force acting on the car?

  09.13: In the figure to the right, a box moves with speed h 97t lq3e,jrb5.00 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 with aqj h ,lrt7e39b 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/s3vnaju 3 z5m3gqk0y 4i at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the to3ngmk0 q3u vi 4a5zjy3p 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, each sgb+ ite zv1q4(tarting 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 dist(zg4et1bvi +q ance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during t8k, 4 tts j9o2rvwlc).y ynqs2he time interval of t4 yt2jcny92sw.qs),vlt8o k r he acceleration?

  12.08: Through what distance does the object move during th.-.k.gjzb g pne time interval of the accelera.p nbjz-k. g.gtion

  12.19: The magnitude of; 6wvht )1vxid, 7cotf the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval ;t71h vdx)cv ,it of6wof 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 kinetic7 z8ltoe 5wvg(v mv)bs c4p9iic0u )l; energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents th)i o90 ivwbtc4l;857 g)(uszpmvlvcee mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavhrx 0d,:w .x 1dv*mwofy suitcase of weight mga distance d along a level floor at constant vrdx.w*fx,wvdom :0 h1elocity. 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 deliverg/n* -k,y)r2y(-a n;cwofq fkm i+no ys a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rais fkwm,-(/-a kfno;n r nyoq*+ y)i2cgye a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, the4ps2*sukzq r: c;z5y2 oskyt4 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 g ko s4ty2p;k yr2 zss5*c:qu4zravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is hms cry7wq)3b, vh5 b,yeld motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of th,yy w hrvbq7,ms5b3 )ce following 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 moving at 28 m/s. The drivv 0vhly0l m2xp*y9iw:er sees a barrier ahead. If the car takew*ip0vl ymh0y l 2xv:9s 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 moving at 15 m/s slows down uniformly untidoqcus.8ie)bf4 pg(a u (h+,ol it stops. If the ball 4, id (sqa8 bfuuec+)pogo h.(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 idefxri-9 eh-ndt ,kc(bx ,)usf8 ntical kinetic energies and the three following statements. Which of the above statem c8 k,(freux,)t-h-sbn xf id9ents 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 i,bq+)rd:jyao s tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air r,ja+ q do):ybresistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, sta(ewqpo;p x6jz* l;i6q tionary 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 hig(xqp6; ; j zqoil*6wpehest 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 frq4 ioxqbw c5,by;jk *s6,9m n4*wistcom 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 resistance is negligible, what is the magnitude of the average constant4kib *qj6c y4sq9;is5bo w*x ,wtnm, c 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. Thez i3 q0cd*89zvplhebdm 3-rku wv453y object bounces off of a horizontal surf 9m*4elzyquc-pvbd 35w0d ikhz3 rv38ace 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 the surface?

  96.38: A pendulum bob v2io: awsp9,omass mon a cord length L is pulled sideways until the cord i:2p s9,vwoao makes 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 unknown angle. The sled, whise6q3tm0s bc6 ch started at the bottom of 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 t6 cq3ets06m bshe hill?

  06.09: A deliveryman moves 10 y +88g utkz0e: bqe2vlcartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has kbze0q:t lyev 8g+8 u2a 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 fign7q4hruz:vq-ap ) q .gure) is applied for the 6.0 meter motion of the bo-a4)qn.7 vg:uzhrq qpx 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 force F onthe box for the motion?

  04.48: Two identical bowling ballqne*5.ya( tof ib*,p es A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before bayn(*,.5 iae epqf ot*bll 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 p5n-n t* ryt4mmass 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 thro nrt yn5p*m4t-ws 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 17y ;nazk9e aha spring constant of 20 N/m. The potential energyz9k7h; 1naeay stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. 7tz ( h-xqc a1vte-mp5hf a4t9What is the maximum spevet5h tt 1-hx-capqa f4(9m7 zed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incl8/o oj3ju3 wijine 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 consta8u 3 3jiojowj/nt non- zero coefficient of kinetic friction between the incline and the object for both trials.