97.01: A force F direq1af .3f4 xz pzp2q2qzcted at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by th f z.qqx1a3q4p2 zf2pze force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her 2i4qbdl0k 96- x z(uxwqq avz(with horizontal speed v. While bringing the ba uax4 q9q2z6qld0( (vikbx-zw ll to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructiong*smb9 1 ezbye;d76 mujth73r laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondsetjm9de y m*17gs 3huz b7rb;6how much power was expended on the wallboard?

  17.11: A 5.00 kg block slideg5zx/ggx uh -:s with uniform acceleration on a horizontal surface for hgx:g5- xugz/ 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 uniform acceleration on a horizd6:dbc g 6mtg1ontal surface for 5.00 s. The block’s kinem661t:ggdcdb tic 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 ik: 1fb7d ((t 9:gkxkk/55zynm d xavkvs exerted on a 3.0 kg block for 5.0 s7atkk(:ndvb mgzkyd9fx 1x5 /kk(:v5 . 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 w) d 7ubv1w30ix-mgls exerted on a 3.0 kg block for 5.0 s. Tlwxi1w7m0s-v3u d)bg he 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 reston a frictionless fro.yntkp: p l)* sc25rjdzen 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 followi5:t dc*2)r pjkp .ylsnng correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic enerzt 6gugm5bm:cf3l wb95 2l.z fgy. An hour after the fan has been turned of lgbl tfz cg29w:.u5f5 63mbzmf,
what has happened to the kinetic energy of the air?

  09.05: At an instantatvchi,2 wlo 8an j/v q(:4aan-zo o9:, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0oc84na -ava/o on:w,z9jqih(l 2t:av m/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 textk*dm x9kc0s/zpp; w0c books is on the 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*m0 xkcs;kpp0z cdw9 / 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 engi 4huun8o 2jmd;k k8j4ipv u*c,ne 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 retarding force acting on the ca*,o 4k;ip2du 4jjm vu8 ckuh8nr?

  09.13: In the figure to the right, abaexr0pa(w igj (5. x( i2ep;h 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.20.g( r;phx wi(ipaajxb(ee5 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/s at the n qc1s+jo4)8pdd v9d bn x:fr-bottom of a rough, fixed inclined plane. The box slides with 9)sb+dnjd-f:p1v qrn8c odx4 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 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, kxjw7 kpe,/+ja9f y:p each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After travex+ :k p,9jak/7 jwyefpling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the time interval of trz5:;d e,xeekhe acceledee z;r5 ,x:ekration?

  12.08: Through what distanbzliur:4b-pv. u idt6b.o8(tce does the object move during the time interval of the acceleu.z:4ti pl. 6b r(-vb8 oiutdbration

  12.19: The magnitude of the linear momentum of a 4.00 kg 1n 36qudaa6lk point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. Whadk6 16ua l3anqt is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic eneug( ,i ny(5rtxrgy while its speed is increased from 2.00m/iu(,t5(yxgr ns 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 ho,1z k: z)7a1ekg2i0g o-rqhtpj3hxg rrizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betwrk0:gejg7h apx 1o1 qtrgk2) z -i,h3zeen 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 power output +h)jd 8znqi0wzg3yksh *l), hof 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane 8yh+qihnk slzjg))3w* z,0dh raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfa;6 6mfvdq2gpe jw( s o+y3neg*ce 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 6gfgjw;m(n d3opv2y eeq6+s*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 ;gexs 2hqu:t9 vr-(xn+ 8jwqla 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 above-teg w9x (u vlrhsjn: q2+8xq; the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ah*0y;gpdfc9 d fead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force nyf gpf9dc*0 ;decessary to stop?

  00.26: A 500-gram balk0fg6xp09yk ,lbro+7zo f7ib l moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied wh fp y7gk+ ,0okxif7rob6 z9bl0ile it was coming to a stop?

  02.26: Consider two laboratory/uw zmdq+a ;:e carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be correct?:qad e+wm; z/u
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 verticallv 0omh,r uvi2:qp9v5 yy in the air with an initial speed of 4.60 m/s. Ignoring air resistanmpy5vov 9 :ihv r02qu,ce, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight uph p: 6k fgnjckt-b,64xward 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 motion6jc ,k x- :htnfpgb4k6. 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 aheightH a/(p glc :ybcyps 56o59cnuiy+ bove 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 constant force exerted by the/ sb:c6i(pynpyluyo+5 c5cg9 ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the groundej;0fow d+j :o+e cwt9yrfo+9. 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 ac;rdyco+jw+of0e 9 fw+t:e9 ojting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon xyxm,4eb4s c9a cord length L is pulled sideways until the cord makes an ay4s9me4c x,xbngle
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 o1mq lcr6xl)so9 ,de 2zf 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 to its original position at the bottom x,qd ) 26c9s1oemlrzl of the hill?

  06.09: A deliveryman moves 10 cartons fg o;*x+ qid:: dqar;97 scphysrom 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 total work done by the deliveryman on the cartons to move themq q:pas*9di+socx y:7;h dgr; to the loading dock?

  12.16: A constant force F=50N (as shown in the figurlxbmw +i1ian yxc;i696 tl:2ze) 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 one of the following cho z+x;m6icxt b2 y6ai1iwl n9l:ices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls hnj r0e4cc g62 ccr(p ff8il*)A and B are each dropped from rest from the top of a tall tfg f*ec jl06 (rcp)crihnc824 ower. 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 8b;mnbh;rz sk+* f6br)b ol7fmass 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 terms of H, to what maximum height does the object of rhm 7;kfbsb;8b rz+bf6l)*no mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a sp g)d*c0fl3m ht1 2yomfring constant of 20 N/m. The potential energy stored in the springgodl h2f3 fc*yt )mm01 is:

  97.10: A compressed spring has 16 J of potential energy7t 2gngc29: taa) vcoi. What is the maximum speed it can impart to agno2c7 )vtgit c:9 a2a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest ;umyg ( hkrzm z-h.,l-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 person on the block compare for the two trials? Assume the same cons(,ly hrm-uzm.;kg- hztant non- zero coefficient of kinetic friction between the incline and the object for both trials.