97.01: A force F directed at anih8l+ (r p n1md8wp:h:yke3v t angle of θ above the horizontal is used to pull a cr: : +8dlhn8pmihwy1kr ev t(p3ate a distance 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 moving toward her m onmmgiub711* p3u s ltc8:f5with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on t*3o 1nlub1 mtcgmum5 :ip7f8she ball by her hand is

  99.14: A construction laborer holds a 20 kilogram shee- /ieacd-zh d.t of wallboard 3 meter above the floor for 4 seconds. During thesehea-/z .d-cid 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block y9tg1 2+qufgx0 d 21il*qwpln slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasyd fxu1g* 0pq lg9q22i wlnt1+es 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 f.uw3 z2gl8h+doq9 p az v4h.d with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this timeg9hv 8. za.d ouwqld43hzp f2+.
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 o(/02ls.;/o2k 8khuwsievwbvw d8b w sn a 3.0 kg block for 5.0 s. The block was initially at rest and slides on v/w2 w.ik 8seuk/ (w;hobd0v sw2 8blsa 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 rig/h.+kh8,i :f+w gvpwfh rc;chht is exerted on a 3.0 kg block for 5.0 s. The block was initially/wfh +h 8v,w :gpifr+chhkc .; 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 initial) qj, 9gvn8t7ku)bhedly 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 the following correctly describes the above sitq je 98tuvh))7,bngkduation?

  03.14: A fan blows thepf+b,p u +0 /iefp.ykw air and gives it kinetic energy. An hour after the fan hapkp. u+p+/fw fi,by 0es 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 has a position of 3.0 m, a speebi ti- zr:vx1)d of 4.0 m/s, 1t)zv:brixi -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 3,thpcmodkr;56r 9 uxthe bookroom 1.3 m from the floor. If the janitor relocates the box to the shek,dto6;hm 53cp ru9 rxlf 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 yjyzw m dn65 ,(ve,ew k/ad;s1hn8mp,ztc 75awatts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about(mmnvwp1ty,eyd k nea d8,5 ac w z5;,hz/s7j6 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 m04d fav 2:mgjyk f8g3m/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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the i d j8gkfmafmy2g:43 v0ncline.
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 movejw wq t.s28qg7s 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 m= 20.0 kg, has a speed of 2.50 m/swhen it 2qgt s87qwj .wreaches 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, al::ov4l 2vooke, kbj1 yong 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 o::e l1b4 j2ovk,o vkyF, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time in 6w; -0ft/cvcsky24jvuc1x tbterval of the accelts/ ct c-6k0jbux1y; wv24c vferation?

  12.08: Through what distanceyp5)x/x 31g cfc zpj,k does the object move during the time interval of the accelerat /p)px3c,gxf5 czyk j1ion

  12.19: The magnitude of the linear momentum of a 4.00 kg po0sy.gu4 nn m;j,qyuw* int mass is changed f.*nqu yg4,nyum0s jw; rom 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 interval?

  14.11: A crate gains 39xm) ( zgupe.g6.0 J of kinetic energy while its speed is increased from gmg9.xz)e( up2.00m/s to 4.00m/s. Which one of the 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 he9 8md en93-bmk9gaow bavy suitcase 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 workameg3 m9-nwbd99 o8kb done by the frictional force is:

  14.31: A toy crane exerts an upward forced 2bm9f7gvdf/ and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At wb2dv 7m/9ffgd hat constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object 8 a j3pwm-zkro ,ao,.mis released 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 mto the ground, which one of the following choices best represents the amount of work doa m-kw r 3z8op,amj,.one 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 hfwcwu - 2dav*) 0ycfcy*p60bdo above a hard 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 0 vdycffw )2u**y6dc-a0bw p cthe ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Thi /7abclr*tsyzn*t 6 /e driver sees a barrier ahead. If the *zbi/*67ynsc alr/tt car takes 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 unifor(;iw+m n8sy clmly until it stops. If the ball travels 15 8+iwsnlcy(m;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 i m+ugofia3k37dentical kinetic energies and the three following statements. Wh33 aio+fg7 ukmich 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 initial sxm,wl.2 a 4kbm7h(o mmpeed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest p hk m.a7lm24(xmmo w,boint?

  06.20: A boy jumps from rest straight upwaruvlzxa*k(zm 2.x0.x 9yjh3uvd 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 of the motion. How much physical work did the axj(.u.3kxma0zvz*xhuy 29v l verage 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 cr/hw/+yurv; 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 convw/ h/+;rryuc stant 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 obyx 1 zfgrlabd1l870 k9ject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward togydzxrblf7k89 1l0 1a 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 d. k7 jpo/dke6is pulled sideways until the cord makes an angle /76d.kdeopk j
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 )7 hexpbm)3 iluniform incline of unknown angle. The sled, which started at thhep i x)m)bl37e 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 the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-metrdca:stvve3i 7.b ,b9 er ramp to a loading dock, which is 1.5 meters above ,ab3sed .r9b:v itcv7the 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=50N (as shown in the figure) is apmj d4pv89iw i:plied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Whici:4v i89jmwd ph one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling*qx gv ;, mzl0.z 9bc0bnhil5d balls A and 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 lzim bb90q,l gx0hc;*nv dz.5 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 straight upward with an initial diq(+z:*oyvjjl. (bqnon-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. i* +qb.lyjqd(j(zvo : 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 ste wi jo./)/ykiretches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprinkji wy)/e/ o.ig is:

  97.10: A compressed spring has 16 J of potential energy. What is-ezxrf i77tkxus3 08r the maximum speed it can impart to ak3fr xxte0ri77z8su- 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at 5gha58wre2 rk 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 the2w rag r55ek8h 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.