97.01: A force F directed at an6pp9 j;yf)+5i ebw fwj angle of θ above the horizontal is used to pull a crate a distance9;bj+ 5w fp fe6)iypwj D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is l km3z7q(h u9cvcm.2x moving toward her with horizontal speed v. While bringing the ball to rest, her hand moveqzm.c(hxc 2u 3m9 vl7ks 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 bd7*g ju1tgz e/6. bniof wallboard 3 meter above the .1bu/gzie bj6nt d7 *gfloor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg xs/km tt+ )rocz yx1fd1geqyn0+ e*30block slides with uniform acceleration on a horizontal surfa/++0 o3*0t) sxezmg cy yx1 1reqtnfkdce for 5.00 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 slides with uny5(fnttgq03v d equm)f 2q xf62 7pg6xiform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enefxvp)qq25x tt6 ggqf(2 3euyfdn6m70 rgy 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 exert zip6g7tqgy53r2f j00u+gzroed on a 3.0 kg block for 5.0 s.0qpy5uigt6r+2 3r7gj g 0f zzo 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 exerted7zmc2 gh hk8.y on a 3.0 kg block for 5.0 shcg72h yzmk8 .. 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 resdjym4v2qr7dc +/ tfc 1ton a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directiod c2qvd jt rcy/+7f14mn while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the aira 7/cf,/pv g o 1,3u8 pebxaput6wjrp9 and gives it kinetic energy. An hour after the fan has b7tj8g/up6 9uaofecp,vr3w b a ,xpp1/een turned 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 of 3.0 m, a speed o2);lv ppz7cr).ry qurf 4.0 m/s, and an ac 7 .l;vzppu q)ycr2r)rceleration 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 bookroocxft 2k n)6a.wm 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the flo2cna .wkx)ft6 or, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine deznk j1de -(yz3livers 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 ma- zk1 djz(3nyegnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bottme1a+( na g4y *wubqd+om of ub y awd++4egqa*m (1na 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 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 rih0gdzl s2+jd2k/ /meyght, 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 being pushed directly to the left with a constant force of F = 240N. The box, of mass me /j2d/g+kd h0lym2sz = 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 rest, along a strqst8(c0t17*p zlj tq baight 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, wb1(ql8c*tz tpjt7qs 0hat is its speed in terms of B?

  12.07: What is the net for1 3b-oi/fxm ibce acting on the object during the time interval of the acceleration?3if o-bbi/ 1mx

  12.08: Through what distance does the object move duri 8yv+k +ii9unung the time interval of the acu+k9yiv8+ iun celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg ;go1gbsaam).a c;;u kpoint mass is changed 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 interva; a)g cua;agbos.km 1;l?

  14.11: A crate gains 36.0 J of kinetic energy j2ez, c 4b73aph; kbzdwhile its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of t42 zja,bdhkpe; 7bcz3 he crate

  94.38: A force F at an angle θ above the3y jx1smg )8.jrn4 5w )oaqvwz horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficientw85g)q1)vnasjm w.4 j x3zory 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 bfqjj2a5 qg8nb;q7v* 9fc *cgmd2yw 1a useful power output of yfbgw*9*mca 2qqf ;1 b2857gnqjvc d j0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, theg4 8( n, woh.kxpzlng z4+wd/w gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on.w/o4h wngwgnz48l,k d +zp( x 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 motionless a height ho above a hard floor and rec dzhvccvm/(3:dealj12 y u*i9+ h0 vjleased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between th9ddycmvc *jhv/za +leu02vi 3c:1j (he 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 driver sees a barrier aheif 6bw82z xzq5ad. If the car takes 95 meters to come to rest, what is the magnitude of the minimum 56fw8 zz 2qbixaverage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it sx t0wfs3vdh 58tops. If the ball travels 15 meters, what was the average net force applied while it sw0 dh35f 8tvxwas coming to a stop?

  02.26: Consider two laborv/nmw/kh6p hx2 3crm9ma* jn)t1ggj4atory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements woulxj p9/ w g62ma vjcg/)ntm3nh 1*mh4krd 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 thx- evn2hi5f,ty m75gde air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its poten255 f,i7denxh-y gtmvtial energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary;2 n2sxnws sn uo4(am- 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 of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do o s ;4sas(xwn2onnum2 -n the boy?

  02.48: An object of mass M is dro2m+*i p*llqspho;m3o pped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing thelsm ;*hm3 +*i oplq2po 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 dropped from aheight H abo3l-nyo c+e- snve the ground. The object bounces off of a horizontal surface in a collsnylnoc3e -+ -ision 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 mass mon a cord length L is pul)2qm2l m46otunbqa8d led sideways until the cord makes an angl lmoqmq)26 nu2b 4adt8e
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 ly 7ryvjdiwk6t9/h (+ 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 position and moyh9ldtk+7vi/6jr ( ywmentarily 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 cartlm+/ 4okz-coll .f -cpons from the sidewalk, along 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 tof -l/mplk.+olc- zoc4tal 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 figure) is applied for ( o8-exu(jd 5kdbeb trqd9a /6the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the followi(6 d jox ke-d9b t/ed8(qr5baung choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest frozq2i:0svf83f9 vnzvj m the top of a tall tower. Ball A is dropped one second before ball B. Afqi j8 fv0n3sz2 :v9vfzter 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 mass M snru qay rku9-mf)a)at 3t7l+ 0traight 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 initiakrm a)ry-u u37+0t9a)anlq ftl 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 o ,/i qexf- e;ylsfn9c1wj;v4 df 20 N/m. The potentiysxjc,94;efd i-1qe/wv; lnf al energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spj,, w-gs if)rmeed it can rmwfs)jg,,i-impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottomq;q*.h ih sev0t8wvg9 of a fixed incline of height H. A person decides to qq9hvtv8e.g*hw ;i0s 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 object for both trials.