97.01: A force F directedpxr cujf.7a+*j3 db9 l at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work d*b lp 9x7u3a jjfrd+c.one by the force F is

  97.33: A softball playenh0fiv v0p.m2)l6 g yry8c yg8r catches a ball of mass m, which is 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 the ball by her hand is86gyvyf0l2r . cyh 8pvign)0m

  99.14: A construction laborer holds ad hvpn,ad ( q7b .a)-yjgyglic rj-. x,mc8*y/ 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended (.j) xr*jy7.lv ,cdb,/-y-c angdh8apy gqimon the wallboard?

  17.11: A 5.00 kg block slidenan1*yt;a ed* s with uniform acceleration on a horizontal surface for 5.00 s. ny 1*atea*dn;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 acceleyxs m , g*ls/ve4loc(8ration 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 time. ,m4s (v8*lsye/clo xg
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 i /,jz 5k n4wr 1fdipc:u:qfym:s exerted on a 3.0 kg block for 5.0 s. The block was ini u,w1qrfyzj/:m:k:c4 if pdn5tially 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 te9 df si46ens6he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest a96s4eeds i6nf nd 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 rl7rsro8sxq,t ok+ 7q nuo ./a1eston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in77 aork1/us.ol +sqt,n 8orqx one direction 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 it kinetic energy. An hour after t zy f0ta)re5i0he fan has been turned o)atzf0 yre50 iff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kv0f )ozdvjy1bk)gy+ 0 g has a position of 3.0 m, a speed of 4.0 m/s, bkg)vo0) fydz0 j1 vy+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 book ;ymgf )z4mgpp.8h1j eroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, ho eggyf1p p4)8jmm; .zhw much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,0j ayd3:o/4m( yh 6a a/jxn+flo00 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abo aly dfa(joa/j/ 3n+46my hx:out 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right,z0bls.m j9( mabl*jd ( 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 ( llbza*.bm sj j0d9(mspeed 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 bottom: h)8 zp/gywl 8tz7bev 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 )zlt b7 vpze/yg w8:8hthe 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, each staj. 1oz-wjcgs2:4rnms rting from rest, along a straight road. CarA has twice the acceleration of Car 2:wjngmscso41 rj-z. 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 B?

  12.07: What is the net force acting8p/ n m dxspqtca0++(j on the object during the time interval of the acc sq8npjxa( m0+dtp+/c eleration?

  12.08: Through what distancek xp2fsb; ,f9y 1bhoh0 does the object move during the time interval of the of,xk9b hbh p2y;01fsacceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is j x/-k;i urawh,)vkvpi)(as2 changed from 6.00kg.m/s to 14.0kg.m/s in a time interv- u x2s w)a,v(khr p;a)iv/kijal 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 kin;+p. r6lbx, fgmj d9lwetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which oblmfg 6rlpx; +9djw.,ne of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizonlziim*,li:h+n4u0 ug +k5tystal 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 flo ikn0l 5t,m*ig+u+z4uhl s:iyor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an f7b6e6)d0qezj ) i2.xrciep bupward force and delivers a useful power output of 0.10 w to raise ad6j z p)f627be ibrcx0ee q.i) 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 rleo;91uii+ v gmiy0:d est near the surface of the Earth, the gravitational force acting on the 1.00 kg object by t+ m;ydoiie i:gl 10uv9he 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 done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball spi:2-cq/rj iis held motionless a height ho above a hard floor and released. Assuming that the collision with tisj/-c r:2i qphe 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 the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver t4lr p:6,i+(zzv i kbusees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averagep t, z ul4iz:6kb+(vri net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until i churz-fyp) 39zsp-wz 6;nrw .t stops. If the ball travels 15 meters6ww) -nzy s-z fr3pp;h9rcuz ., what was the average net force applied while it was coming to a stop?

  02.26: Consider two laborato oip+h99d e 3oec:.rxiry carts of different masses but identical kinetic energies and the three followipx .o9 +ii3e9:h recdong 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 verticay)2s2vjv rx,bzez *6 prx8l e-lly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change l2 x v2-6sx*)zr, zr 8jeypbevin its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwa sgxe7dy ta,n.p 7akzdi8o065rd from a flat, stationary concrete surface. The boy, of mass M, leaves 0asa dg.kptd 57ney,z7 86i xothe 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 on the boy?

  02.48: An object of mass 1,a*vl i 8fo5flgm bcqcu4*q7M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressiv5 qqo ,lm1i*8fcb fg* ac7l4ung 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 dropped fhwn vt+s chx.gi1/ l*-rom aheight H above the ground. The object bounces off of a horizontal surface in a collision l*sch+ vtnhlxg/.- w1iasting 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 bos7n*rwl gb+ 7tg-)e7 xuv8ejy b mass mon a cord length L is pulled sideways until the cord makes7l- e bujstr+*e7)xy 8v7w ngg 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-phn4.. tbe7kzva xj mmf2hq5c()bq- 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 tozmt c4nq7kf vb. p-h(e 25mqjbax- ).h its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the w ji ty .0hnp9h+0/xybsidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above b0ij0p.+9h ht/wynyxthe 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 avx x9okj p**s4pplied 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 choices best repvx*4k spj9*xo resents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppx )f:owlderc414v8 qned from rest from the top of a talq 4 ndlrcx f4)w8e:o1vl 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 og9m7r gmk45b/py6y bh bject of mass 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 m7 6r5b /h9gmbgy y4kpobject 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 cot8 j8gv7w/nc hnstant of 20 N/m. The potential energy stored in the 8/ h7jwgtv8cn spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the rn,r- ue(.vte maximum speed iere -tvnu(, r.t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts frj26rnq.ugv o9udjr3* om 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 pervjq6 r* 2j 3dr9u.ungoson 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.