97.01: A force F directorms*75 jm. p85fdxdl +1wfaqed at an angle of θ above the horizontal is used to pull 5fxp7*5a o+jdwr f1 smldm.q8a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mai0so nhb f4+asrl)-ssv8jq v4;ioj; n b+7p ,jss m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant h4,aj 8svn-r0+vnlbfp;;+qs i bo)sji4o7js deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogrtzl w4ax(4lqo9 6gvw7 am sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much powt6 4(gl7 vwqxzw9ol4 aer was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerats afao; 824ln i;/sqoo6 s4dgmion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 /a2o8;;lsmo 6dson af4siqg4 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 acceleratioq*l-b p h tnocl8lhnl*e57e./n on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasen t-8eqllpn* leolh5b/ .h* 7cs 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.xt/+g wob :*eqvc kl;n0crc170 kg block for 5.0 s. The block was initl t;xqng1o bc* v :c/wr0e7+kcially 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 jr1r4 0lowbr;t d31w qforce 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 horizontal surface. 4 r wwrqlot1jrd31b 0;
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 c,n,ba( ;lku uthrows a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction bu kn(c,;,alu while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives i0iq59ezhh:x bt kinetic energy. An hour after the fan h5x zbei0h9q h:as been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kzlsx-- w,lb(uapxd qj056o ss06z g7 xg has a position of 3.0 m, a speed of 4.0 lsz-bxq p sz j7sdl5 6w0(goa x6-,x0um/s, 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 the bookro. *f xcrt+nwruij5 ;hclw9z 49om 1.3 m from the floor. If the janitor relocates the box .z4rw*w9 x +n;crfcj59uit hl 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 engine delivers 24,000 watts2y-sghujf 0p,0yw d) w (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 retarding force acting on th s20- ydw 0yhgw,ufj)pe car?

  09.13: In the figure to the right, a box moves with speed 5.0 s cp3*adtot(,k9820 n mvx;dh gk6ggc0 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 apc86s *9h0; tmv(xk3c ,2tnd gggdko2.50 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.i0t (pksdllk :1xyg (r2 6-eys00 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/sw r2: -yt(xll0ispsydk16e g(khen 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 msn.:zi5* yhbi3zpz2.w +of xright, each starting 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 z5zpy2xb mfn*. sziio :3w .+htraveled the same distance F, what is its speed in terms of B?

  12.07: What is the net for7:q- 2fv;g / ambxlhshce acting on the object during the time interval of the accel ghvaml:2/h-7 bsq;xferation?

  12.08: Through what distance does the objn3e),pv t,oak ect move during the time interval of the ac,)3o pn vat,keceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is c. :apy 0b7qzgmht)n6iti,io: hanged from 6.00kg.m/s t. g ai)z6:mipbttq :7on h0,yio 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 36.0 J of kinetic energy while its speed ircyakbcjs /(:o((*fc s increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents t:oj c*( b( cr/sfcayk(he mass of the crate

  94.38: A force F at an angle θ above t.wyj6hw9 t1gz he horizontal is used to pull a heavy 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 work done by the frictio69 hgtww j.zy1nal force is:

  14.31: A toy crane exertsob1.6ef2x prvmiv9f : an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will : rvv6e9fpoi1f xmb. 2this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from resth vu nair62i4bul.h) . 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 iula6r .iu).nb42hvhbest 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 hoox u99.tjn d*m above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the follo 9tu9m.*xon djwing 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 driver*jr3q w5o;lnpq9fb5umj 2 7br sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary torn l5b5w9jq 7*2oqp ;jbfrm3 u stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it,.yyds(h).c xa2 jddg stops. If the ball travels 15 meters, what was the average net force 2d. jsdg)ch,xya(. dy applied while it was coming to a stop?

  02.26: Consider two laborato4-x z.tl jeg92lg+cgsry carts of different masses but identical kinetic energies and the three follow c -tl sl+jx.z49eggg2ing 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 ifp0x(0o6z b,rloa dh 5n the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it re,5 lorhbf06z 0xda(po aches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationkrlvh .8; :ol0v yl-cmi,/xb fary 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.b:,hvc-y il.r k xfm8o;0l/vl 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 a1s t+d*qjt5 le aprn3,0lr9pkheightH above the ground. The object cra dql5p1jtke+0t*r9 3lnp rsa ,shes 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 constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dro yt s9wvc t w:,2,v605xqf9dl7gsqajipped from aheight H above the ground. The object 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 q9v,a6tl:v d swi7qcf5gxs2 t wj,y09 the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until thia3px w5cw6 l:e cord mp:w w536cxai lakes 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 anglpem-sux3a g40e. The sled, which started at the bott3au mepg4x s-0om 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-meter rampw 2liva jo 4s6zh8k4u2 to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the dek2h u8l64zja w o42vsiliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as sha;6vkc :k idah-v a/9oown 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 on9 ;h k/d ac6vaa-iv:oke of the following 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 frozg 09-t47/ke bm pnx3jlp:zhwh l27iwm rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground,j2pw px t73 ekilwh m/gznz7:9blh-04 how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mas l7(ff s27wdsr qpo09fs 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 throws an object of mass 0.5M straight upward with initial speed 2v. In tef9 r(s772qd ffso0pl wrms 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 4tkpm9*mrcg (has a spring constant of 20 N/m. The(* m4 pmrc9ktg potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. W x52n6j 8t1u9nbfxqfphat is the maximum speed it can impart to a 2.0-kg obj9nn86u pqx t fj1xf25bect ?

  

  10.31: An object of mass M starts fro i /r) zyow7:ca:apg16ie3fxum 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 each of the trials, the object reaches the top of the incline with speed V. How would the work done by the pe i xw 7ofpa azgriy:61ce/)u3:rson 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.