97.01: A force F directed at an angle of θ above the hor,gyxtfrk2epojz : .j.h7 ;2nfizontal is used to pull a crate a distance D across a level floor. The work done by the :rhj tgok.;nf2.ex7 yj,pf2 z force F is

  97.33: A softball player catches a ball of mass m, which is moving fnxbaq1ge3+sa6** vrtoward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the h* fgqera+1 6s anvb*x3orizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogr.,; x bps zrw nsw(74ilnl-l.ha ;pz,aam sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex l7ln.zb;swhp ,z 4(l.a srn,;-wpaixpended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on; m5:dido6sg.qahdv3 a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in th vqgid;56h:do .ma3dsis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with qdf5gm6e :.v26gw 6hoz1wyi p uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energfe6.phy6g6 omwvdq:5 zi1w 2gy 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 ri77 k o(-g 25rbdllmdq.7wwfjlght is exerted on a 3.0 kg block for 5.0 s. The blo 7 7k2drlw (jl-f75qgbw.dmlock 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 j nst++ve rv4*exerted on a 3.0 kg block for 5.0 s. The block was initially atnvs +4tve *+rj 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 frozen ponddx.wl:-ey yiz8e -dpjv:x 6.w 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 following correctly describei-yez -xpwldw: dey xj8. :v6.s the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after t0w f j igj-/ o4-sq:o:8tzjpwche fan has j:4ozgp /ot0j-ji 8-swqcw:fbeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a pe3gc6(u b,1 o mf.ieagctq*0rosition of 3.0 m, a speed of 4.0 m/s, and an acceleration g 6.ec*gba0ufc1 q,om ei(t3rof $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is oe,qu 5sy rk;zkl-wi 58c49moa n the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocatesw4za;9-y k m,ic 5lrq5okes8u 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 a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horse;l1gf naa(hh :power) of power to a car's driving wheels. lg; an:h(f h1aIf the car maintains 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/s at the bottomx;vh0- vz8p7)(yt-aka mb uaz 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,bv-(a-0m7yx 8tka h;z)upaz v 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 mnbqs/9-: 7. zmwafsuw wg vs-)oves 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reg .:sw9)-/wvw nau-fb7 qzssmaches 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, ea:b0rrh , :wz (e2icijwch 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 trbez0ww2,(i ch: irj:raveled 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 vj g e61gxm,b2interval of the acceleratg,jgm1 e62vx bion?

  12.08: Through what 5j2jrk6f u*qv i; gnlxz5l+1 xdistance does the object move during the time interval of the 1x2+ *k z xljrlvj f5n6iu5qg;acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed f,2zrk.mx3qtiag ;x 5bf q l54urom 6.00kg.m/s to 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 lxk.xq,gq4f53imza2u b5 r ;ttime interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased ,;m (6sxc/vcwbw3o) 2wr7e;koukiz h from 2.00m/s to 4.00m/s. Which one of the follo;3xsi w;2mw w7 uk(hkv z )oc6/rcb,oewing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull 2co ox9e5h:uva heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor av: e9hxco o5u2nd 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 powe4 k)r bi)l)sckr output of 0.10 w to r c4k)kls)ir)baise a 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 rest near the surface of the Earth, thca-2, g qvmz8 ,vypk.ce 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 choi.kvg,c-a8,qv ycp m2 zces 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 h n9 4ga*j6cs3posmg9u7vg j 6nnz(;hneight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows cjn u;z*m hgag (vn9p67ssn nj6og439the 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 sb 1j xp0si8*9hp-w,p:yt xram/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minims1iyxs,p8 px0 whtb*r-a: jp9 um average net force necessary to stop?

  00.26: A 500-gram ball moiw,tvkm;g zxl , g*lu1,nmbqc-q 7 e*uxa27n-ving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming *2qg be c* anu, t 7 lx;,qzuinv,mw17-lg-xmkto a stop?

  02.26: Consider two laboratory carts of different masses but idenaqvbdrq9 b6(w 7n ,8 uekl2k-xtical kinetic energies and the three following statements. Which of the above statements woulb-k( qerw x9l67 kdnbuva82q ,d 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 u a0 yef7,ykwf5zhns pp(9( b5clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when uz (y 9w7(ny5fbs 0,p 5ahekfpit reaches its highest point?

  06.20: A boy jumps from rest straight upwarsik7/ .( nnjhvd 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 normal force of contact (N) betwee/k s7v.n( jihnn the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the groundy5)ic eg5*g s.:(;eom4cb/sdrox y jna8ygf ). The object cras 4sc ))x8gr.(:yg;5ayeon/sfm cydio*5jgbe hes 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 dropped fnjqh)6 4n/ bssjewi.szor 7- 1rom 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 the mb rns617jqei4sh-w s/ jozn.)ass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulledsnpf4 la4/tu 4-yj *lv sideways until the cord mj- *a sfpl4yv/4u4tlnakes 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 u/w.ax mmvgi*ir-vqq; j o90qxv d :)g5p a uniform 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 its orivgmgdo0qax w* xv. j/v)5qqi;-r9 i:mginal position at the bottom of the hill?

  06.09: A deliveryman 7zr:)8/gg vr; x6uuxpkvn6l2ycjn: a moves 10 cartons from 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 rv6a/v8;ux:) pcx :nl6gzru kn2gyj7the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) i 5l9+7dqb,gyu0dwbvv99x lxps 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 choices best represents the work done by the force F onthe box for +db0qx vx9d9yll ,w5ug b9vp7 the motion?

  04.48: Two identical bowling balls A and B are each dropped from tb :7nwx:b pgl2;lb:l 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 twnll2p;lb txbw:b g: :7o balls changing?

  11.28: A person throws an object of mass M stc 6ue*act:7mx raight 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 :* 7atcecxmu6 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 a-:s cotggz.24k mu6pj 7nop4g x3 +xoconstant of 20 N/m. The potential energy stored in 2.cx+oa6j4 7st op ggxok-p3 gn:z4umthe spring is:

  97.10: A compressed spring has 16 J of potential en )2v ymw)tihe4ergy. What is the maximum speed2 ve)thym w)i4 it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from resekcaoq,: :l(ob o)9d ut 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 trib e9uqco): (,lkoao :dals? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.