97.01: A force F dir pbn5,4.nd6h6gh ml+.qeo glyzdg0s4ve v3t. ected 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 the force Fe 65 vp.,ghd 6l4.3 qv+nst.eby noh0mzdggl4 is

  97.33: A softball player catches a ball of m(x i;,kn(dt dmass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distancedtidmkx ,;n((d. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet off ))khc/cgfmm u 87k7t wallboard 3 meter above the floor for 4 seconds. m87)c u/fkgk h )fm7ct During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a ,p8 kkf.ft.4b1ial zs5p jc o7/x* fukhorizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in jb/5ft8 *pclpakk4fxsu1f,7o..i kz this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with unaspqwwg32wj;b,+ 0 uniform acceleration 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 uswbgwp 2 j3,n0w+;aqtime.
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 inw)v3p4a2w rto 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 3r4vi)wwp n2asurface.
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 3.04 bgnq vmsgx8se l-1/1ia jub3c: w6j9 kg block for 5.0 s. The block was initially at rest and slides on a hi xs - /b4:g98g1wjcbvu1jm3qls6a e norizontal 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 pond throws a 1 kg p9o .75huer+su/jk tj d07ycmhammer 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 following correctly describes the above situattoe7j0uk7/mh.s yju 9dr5+ cpion?

  03.14: A fan blows the air and givg;g ,ewnyw2 ,,ojt/vjhna60:a rfd0tes it kinetic energy. An hour after the fan has been turned off,;gwaj y a, 6 n0/f0weo2jrtgn:tvd,h,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has axk1b l)2r,tw a position of 3.0 m, a speed of 4.0 m/salkb,w12t)r x , 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 bookroom 1.3 fgb6c9(,d04h qbcbdl 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 ql,g bc(4 f9bcb0h dd6on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of pow /x;s,daoo5 ku3 .ffeaer to a car's driving wheels. If the car main3x oa s,k5d.f fe/o;autains a constant speed of 30 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 speed 5.00 m/s8gxw6yr/: jen85 5 j us;hfcva 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 punvw6j5;gs/f58 c ye x hj:u8arshed 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 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 ay0xknos f 7 8.beh9r48diaxn8t 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 7s40 r.yhex8a f8d o 8nkxnbi9a 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, e:vsvo 37gskw3n k 9*ucach 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 traveled the samv*v3wn3sck 7go: ksu9 e distance F, what is its speed in terms of B?

  12.07: What is the net force acting on 5 gbo+3h.zme8vr9nn) o 8im npthe object during the time interval of thempmv oen5)g 8nh9bn8r o3+z i. acceleration?

  12.08: Through what distance does the objerfe6q.7o- -oaw b 0bv )2+ysy q41rwl p3cfdmmct move during the time interval of the accm. 7 b4+wrd-fc0e o -q2rbqmy6a)lovw1fpy3s eleration

  12.19: The magnitude of the linear m dgl95p u 3,xo y:/wch84s.ixkkefma6gk4 e0womentum 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 the change in the k6m3s h w4ge8ck x5e9u d .wok ag:f/i,xyk0pl4inetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increaseda v1/b4jfa+wt from 2.00m/s to 4.00m/s. Which one of the following choices best represebvat4 j+a1wf /nts the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to/6t3yzj/ne mlh nhy8 + 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 donehn/3 8y /j6yzmnethl + by the frictional force is:

  14.31: A toy crane exerts an upward force and deliversnv8p5uy,ohpl ehc3m l 45l)i63w /i qs a useful power output of 0.10 w to raise a block ve8il35p 3ov,lpqi lw4u m/h)6y5 hcensrtically 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 relegyd g:ox31hv+ g syc :uaw:t-9ased from rest 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 best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object+oy hsxg9d c -g:tga3:1y v:wu during the fall?

  96.18: A rubber ball is held motionlb0fcw/w* vsfu (t +mg;ess a height ho above a hard floor and released. Assummtb/s0fwwu *;fg +(vcing 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 surface?

  07.06: A 500-kg car is moving at 28 mowbpmmj87 gdk;;pz7 sch .42i /s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average ne ;bi phzs8 7c; 42.jowkpdmmg7t force necessary to stop?

  00.26: A 500-gram ball movih-inebs,uw7-z*t8ihn(k bjx e a(acu99gp,( ng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net for,pix -z(ane(bu b997et, cjua8k (g hw *hn-isce applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differendbci+w1: *mrwtc+uvk/8i )gg t masses but identical kinetic energies and the three followibg*dm8g r+i+kc 1w:wicv/u)t ng 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 av3mey8w ;b +tof clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what i8a me3vtby+w; s the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromev s5n4dre)5*;pfkqe/dqt n0 rest straight upward 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 motion. How much physical work did the average normae50d 5s*qeftnn4/p rke dqv;)l force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass Mse5ag8 .s+ at ke5-11ew5 x9kz -z d4xebgbtdr is dropped from aheightH 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, what is the magnitude of the average constant force exerted by aed5+ 1k 9be-gae5 ttdxgsz-sk4 rbe8x5zw.1the ground on the object while coming to rest?

  12.48: An object of mass 15vfgrkmat 7xt314a sd*im+xM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collisioar+v* m1st3 gm 517x 4dkxftian 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 marx.b6 /ewot4 wss mon a cord length L is pulled sideways until the cord makes an anglew w .6/oxeb4rt
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 uniformtolqx7o4, :e4cpb5zxc m (8pn 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 to its7 boec4pn 8zlx, cq5:(4xpt mo original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidet/b:cjnz h0ah.5 o)y 4 j)d+q3hwujsa walk, along a 10-meter ramp to a lj4z+yh/o cbaa )sqjt0n uj35) .hdw h:oading 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 them to the loading dock?

  12.16: A constant force F=tz l v:omfr4:z**0 ml ,a-bscp50N (as shown 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 one of the following 0p,btf la mzz mv4sol:c*:*-r choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling b9xlgp5xk r w30alls 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 changilk 035rxw gxp9ng?

  11.28: A person throws an object of mass M straight upward with an p8r/ xxe4 0ftminitial 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,8x/e4 0ptrmxf 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 oa ::lafqg +/istretches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprinio/a:q+f lg:ag is:

  97.10: A compressed spring haixwj (nkm8/-b s 16 J of potential energy. What is the maximum speed it can impart ton(/ b xk8i-mjw a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest ayxs7/5 ezs9 /l)iyp b(nrdai1 t 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 constant non- zero coefficient of 7 rdz5s(1nxy ip/e9y sialb/)kinetic friction between the incline and the object for both trials.