97.01: A force F directed at an angle of θ above the horizontby02tcqr15bgbw1 i; h al is used to pull a crate a distance D abcw1bit1 qh5rg;y2b 0cross 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*d.l0,wewq:(s ; wyiygib m .w with horizon .0qs.wie:gwywid; m( *wy,lbtal 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 is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter aboa +ncnr/q kp8hf5zt32 ve the floor for 4 seconds. During these 4 secondshow much powek8nh t/cr5 2z 3n+pfaqr was expended on the wallboard?

  17.11: A 5.00 kg block slides wit uvx*-,zcr2 ./ebss rjh uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases b -cuse*2 .rzrxjv/s,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 bloc (e s)y. my9xo:yj3pf c*gcv6ck slides with uniform acceleration on a horizontal surface for 5.0cf esp.)3y 9vcy6 :xyj(om gc*0 s. 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 righ.g-vebb a 8 j*4 mew2xitl2pw1v1hc s;t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sl-2csjpv we.btlh;a bi 4xwv2 1m* 1ge8ides 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 e-dfv 0o7ouf6 yjjdbk:y +j icf-89 d,directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially atj+bf: dcj -7y0ydoe-oki 9v6,dfjfu 8 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 frictionlr c ;8zs c/yrbgqm8v-)ess frozen pond throws a 1 kg hammer in one direction. After the throw, q8;sc/crmz8vb-y)gr the hammer moves off in 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 gi)w)if1:sxfdci r7 *ns. 8zc qamg)ss 4ves it kinetic energy. An hour after the fan has bee4)q7xw81a i dr:*i.g f)smzss)f cscnn turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a b)n b gd+4jrv5wwh-4 iilock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratioibwnd54+4jr wgvi)- hn 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/z48 cxhakra n+ae -)f4vzio. 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 v-zk).afch 4a +a/xzi4n oe8r a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of powerpx,0 sc6e/md(a0 u1/lelst sz to a car's driving wheels. If the car maintains a constant speed of 6ztuc1 ,e0ap 0( /llsmx ss/de30 m/s (about 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 sp7ajzl-vl ffsdlf 63hhwecl) 2z6-: )peed 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 )z7 vf lal66lfds l3hz-- hf 2jce)p:wit 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 zn9)ji j/s)b qright, 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 direcb)i/j9)zq jn stly 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, each starting from rest, a;3m q oetuk870epgpl 7cr ne./long a straight road. k8pe;p u.m e30t e7lqgorn/7cCarA 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 B?

  12.07: What is the net force acting on t)r g:xn5ahr hbi;tb -;he object during the time interval of the an bhib5trh xa;:-gr);cceleration?

  12.08: Through what distance does the object move during the time interjnju)59f vv wj1 qhc97val of the acceleratiou hq1 wc9j9 j7)nvf5vjn

  12.19: The magnitude of the lf:re kh)zyu8jc,;pb 0 inear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is fur8ky)0ej, h ;cpb: zthe change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kineticy(( do(nt; pkski s.36f9 6px gv,aafh energy while its speed is increased from 2.00m/s to 4(n sa p6vfph;y3 tifks(x6go, da.k9(.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 he 2ty6/gmz umysvd +fuy)m/* p,avy suitcase of6 s/y+,pmmmu/ tyvzdyu )* g2f 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 frictional force is:

  14.31: A toy crane exm4gto4--cp tm zn08h/ 2fw zjaerts 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 2-a4/tnpw- zzm mgfh 8co40j tthis crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface omm3i 0d91keh-i pef6yf the Earth, the gravitational force acting on the 1.00 kg obi pm6mi9de3 01feyh k-ject 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 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 a0; f7l)dst(a9 o ukvjwbove 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 above the surfacj l0f oas u7t(wvd9;)ke?

  07.06: A 500-kg car is moving at 28 mcey8po;j;awv7h5i8o+b05 a hpq c4 d k/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimp wo;+5peic 8078vcay ajohkd b5hq; 4um average net force necessary to stop?

  00.26: A 500-gram ball moving at 15)mfwhzi-il mh3y. m3yi i.9w; m/s slows down uniformly until it stops. If the ball travels 15 meters, what was tz m hm-fli.;hw 3w)9yiiyi3m.he average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses b1ry0hc1+ v 1ucadhs2m ut identical kinetic energies and the10+acmvsdurh h1 cy12 three following 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 tuv83av .3xbl kossed vertically in the air with an initial speed of 4.60 m/s. Ignoring3x .kav8uv3l b air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary conco8(.pla0 gwq dazk:b w)g0;bd74e uofz e 7)nerete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d top7 d )w0fqabzu)o; kgowe7ee48:0az.gl b(nd 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 aheightH above the ground. The o rav d1yk :c 7mm+owhx(7of,r8bject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. 8wfhar7r71o (mykv c,md+ ox: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 mfvu 73g pu4aq,ass M is dropped from aheight H above the ground. The object bounces off of a gqapu,34u7 fv 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 collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sided dh.h)mc7ni vid40 2-t6ss fiways until the cord makes an hdhimt s 7id6si -cvf)2 d4.0nangle
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 sn1 ozay7*d k:2x gg5w3l7dkoof 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 como75sg1 kolax:g*dz3wn 72dky es 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 t*zda 3jt9tml )ow:du)he sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a ma*)ao 9 lwzmd: ttjd3u)ss 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 a ;r101uupg*jan*,)dsnm jzq xuj2l zgv,w3(m pplied 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 represents the work doa,* nuvwrz*p2xm 1 j,lszgn ud (;13 j)jugm0qne by the force F onthe box for the motion?

  04.48: Two identical bowling ball5:hve,+r -ad:rjau p dpov8;ls 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 but before ball A strikes the ground, how are the mechanical energies of the two balls changing?alo p: h-rddjv;8p:v+e5r au,

  11.28: A person throws an object of mass M straight upward with an initial nvup;vm+3yi+aqs cf(1d ) t:fb on-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 ; v(+btmva )pcf yus13f:dq+ iwhat maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10)5 fxir8 xotdi:c-g,o N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in thei-xrx:,oocd5 t gf)i8 spring is:

  97.10: A compressed spring has 16 J o*xjl hsx( ud430l2vakdzsqj)x3 55m af potential energy. What is the maximum speed it can impart to a 2.am(dl lh*s3 5)x4 ks2aj3 jvzqdxu5x00-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed i.bvv mf1c;qxf0qe q :2pf4/5o( uesbhncline of height H. A person decides to push the object up the incline in one of two ways5 v2uq:o /;shcb(fx1.0qemv4f bqef p 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 constant non- zero coefficient of kinetic friction between the incline and the object for both trials.