97.01: A force F directed at an angle)uy )n )xm4 pm4dxr9eg45z-jg1p aiaz of θ above the horizontal is used to pull a crate a distance D a-)4rd)9ugpxmyaa1i5zgx pze m 4 4)jncross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which i 7j3um4lo *ogbs 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 t4gbu7l moj*3o he ball by her hand is

  99.14: A construction la2f4hf 6ste c (v7ul5bcborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was hlf45cftbe(6 vcu72s expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizonta/ jit+ 6xozj1bxsk4c4 l surface for 5.00 s. The block’s kin6 /4z+i1jbsc xko4txjetic 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 uniform accedlig)ly2b2)oq 5,opmp* pp5p qjne /-leration on a horizontal surface for 5.00 s,-bl l e)pp 2dg2*5noqi/mq yp5j)pop. 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 q:- rn,;nprmqkg block for 5.0 s. The block was initially at rest and sl-qm ,nrpr;q :nides 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 exerted on a 3.0 kg block fo6d0 i1tymoz be v5*nb1r 5.0 s. The block was initially ati*0yn1odze5b 1 vmbt6 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 ponh45jpy*01adqb p2 zrqe/n0mr+t f e9h d 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 followinpq 9z04 5n1td+*0 hb2ymrfe/hprqj a eg correctly describes the above situation?

  03.14: A fan blows the ai* vqz;v*rv;nfqe,zv:j75 vs kr and gives it kinetic energy. An hour after the fanvsvev;:; *zn,vj 5vrkfqqz7 * 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 has a position of 3.0 m, a speed oaw p2f:h4 dmqdnk9o-. f 4.0 m/s, and an awp-af .9 domqd4n2kh :cceleration 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 t47cwiu+i 4( ff jb+woghe middle shelf in the bookroom 1.3 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 mufbg4(+o fwci j w7+4iass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32:-c/hj) mrvphffn * 81z m/mur 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 retardi:rzv pfrn/8mjf/ hu *cmm)1h-ng force acting on the car?

  09.13: In the figure to the kg,7zo.630smv 3gpdcl; yiy1jo hap/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 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 vzgpj,3lm3c0ha/ 6ykyp7sg .1 io d;oincline.
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 atd r8:o;iusu3b 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 i:ru;8dbs3 oiu t 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 4rr i3a4,xew yie;s,rstraight 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 speed in terms of r43,r 4y;w iier,seax B?

  12.07: What is the net force acting on the object during the goxo-+ o g2 ml3;2)z2zfvd 9qrncj*metime interval of the accelerati jq 3geln; +2z r)zo9mc*ovx2om f2dg-on?

  12.08: Through what distance does the object move during n5kbsu o 4kcgu6 pjj,w/2:vq ej) l-n*the time interval of the/j v gsq) jekn-5lupu2bn:,6cwjo*k4 acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is change( j p*mc)d0xxhd 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 xdc mp0h(xj)* energy of the mass during this time interval?

  14.11: A crate gains pu0 9 ubo9)eq5s pak-b36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the ka uus9b bq 9-0o5)ppemass of the crate

  94.38: A force F at an1;8 sbab/irr dh7;po,v e7szi angle θ above the horizontal is used to pull a heavy suitcase of weighvpb7abz,1h; rr7; /8iis sodet 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 is:

  14.31: A toy crane exerts an upward force and delivers a useful p91 utci x7d fmpi. cb/)vf(,boower output of 0.10 w to raise a bio9)x7mp1iu f,(. c cdbf/btv lock 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 fg7u1 49b 3ngky)ebz7 jdtqwojsb773 of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on tsojug74b37 kwdzb3e 1 79gftqnb y )j7he 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 m ta+6etxpn1x* otionless a height ho 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 the ball and its height h a1 t6*axt npe+xbove the surface?

  07.06: A 500-kg car is moving at 28 m/s. The rbuqw;y*a*q;- c az/p z84xjudriver sees a barrier ahead. If thepx; bw8cj* -aqya/zq r* u4zu; 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 uni w2 etb88v*v d-9xflfcformly until it stops. If the ball travels 15 meters, what was the average net force applied while icb lvf89x2t-w8 *efdvt was coming to a stop?

  02.26: Consider two laboratory carts of different masses but * afh4rs 4tsb)i6/z vhs,(gckidentical kinetic energies and the three following statements. Which of the above r(ithh/fazkcss,46b 4* vgs)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 vertic z6s9lx*0 plofsq:sg; ally in the air with an initial speed of 4.60 m/s. Ignozl0*ps6 ;ofl x9g: ssqring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straxx xcch834t:xight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed vx3tc4xx8xhc: 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 on the boy?

  02.48: An object of mass M is dropped from aho5jo 8kts:+s1r4trdj zz ;3um ehl(6 ms6ipo5eightH 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,osj 5m(d63 1m4 5ijtt+zso8; :huo 6kpeszrrl 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 obq3:zjge(kc 8v ject bounces off of a horizontal surface 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 cv3 :8(z qgkejcollision with the surface?

  96.38: A pendulum bob mass mon a cord18s/kfuya ak81 ooeis1rt44 j length L is pulled sideways until the cord makes aa i8k 4/o1ju1ty1e 4for8ks san 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 ynj)6-5 gpozz f7k w gt.4,vzauniform incline 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 position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns z .y6j45wnf vzz,)ka p7o-t ggto its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk,cqu.w2nhn niz7+4c rv) x1m,7boj,em along a 10-meter ramp to a loading dock, which is 1.5 meters above the ccbn 7)menmvo17j +q xhw.n 2,iz,u 4rsidewalk. 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 applied for the 6.0 +x -).enlzz 1l mm2fgmmeter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best rep mm.me-2fz 1l)x+gz nlresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling w ,(ho l7ztz.iballs A and B are each dropped from rest from the top of alot7(izhw ., z tall tower. Ball A is dropped one second before ball 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 mass M straight/mc1: kdfvh90qmkhp o1axx72 upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throwshk xxa:qmpo 7v0 f/mcd19k21h 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 a spring constant of 20 N/m.xx* 2 r e7,f3 t*gj d:tz, si1oja9*7zmuqeytr The potential energy stored in the sps 9e1g7*t*iouz j t*2,3xdfa:ez xr,tyq mjr7ring is:

  97.10: A compressed spring has 16 ji 22-xhqh+bzJ of potential energy. What is the maximum speed it can impart to a 2.0+2h- jb zi2qhx-kg object ?

  

  10.31: An object of mass M starts f* a5f2 k)wm r5czaz5my 49blzcrom rest 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 5) c lz2m*amb94wca z5f rk5yzeach 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.