97.01: A force F directed at an angle of u7z/k n4uy k;s θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the un7 /yksz4 k;uforce F is

  97.33: A softball player catches a ball of mass m, which is moving toward v.uy ,nwlsegkr w,9-s9xl8yh)+h 9t jher with horizontal speed v. While bringing the ball to rest,-9n l,e xg8rtl9j,y vyuhh s+ 9s)k.ww 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 hj0z(,d ak1wj1k nnj+ a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Durik(n n1ja d0j +w1z,hjkng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slide*h2x q(g(ig a2i +0efxzq3ed * y1xrpws with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrea1h * 3 xr(iy*fwg0q2iqdexg p2ae(+ xzses 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 horizontal(sgz l k9oejwe)y/v2) surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 v) )jys w(e 29kloeg/zJ 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 directej5 d6d:v)ny*f3et pl nd to 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 surfacpt65ln3v*e:n dd y)f je.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forceg plr7t45km5cal: f6unq5p8 i 7ovz5 u directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was in:8kvm5o tp rlzcnu5g6ilp75a5fu 47 qitially 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*zr9no7j/xk+b+kn v2 t8zroxs(c m m- reston a frictionless frozen 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 following correctotmc z7b* rs8 - +2xnjzr okm9vx/(kn+ly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. g9f g cagtsr..6w7)78r6wu m;xs zv cr An hour after the fan has been 9 ggxsrwc7)m6fur 7t; 86 .azsgc.rvw 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 position of 3d w*(;qs*mcin j sdc52.0 m, a speed omc* dqs wd5 j(c2sn;i*f 4.0 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 textbooks is on the middle shelqm /a0)z4xn*5 siez urf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2am4 /uqszn 05erxzi *).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 automobileq71 *7t fj6zzxr.mymosm6t 4p engine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a cons.jy7*m6 1sqp m zttxz6 f7or4mtant 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 rightm og-r-2ue- j-wq (ovrzrg5q1, 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= o-vuowzr1j -gq(-m g err2-q520.0 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, f9*ti q j*uetzr9e ygnr +1 eyv371xc;a box moves with speed 5.00 m/s at the bottom f ee7u jrtngz;**1y9q rcxeyti9 1v +3of 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 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, along a straight 1ald--sem3(a e8 ffdr 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 same distance F, what is its speed in te3( fmdl81esafra - de-rms of B?

  12.07: What is the net force acyk ime9 f.z2:qting on the object during the time interval of the acceleration?e.2 mzfqy9ki :

  12.08: Through what distance does the object move during the timef49;l30rxdo )axllg fm;mpn; nu*t .q interval of the acclr.dp l;f; n gm;nlmu3qxa 0*t x49fo)eleration

  12.19: The magnitude of thefh) mh3*vkycu7a 8f6ce0j did8rp7m- linear 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. Wyr3hde 8* u0m7v 6)jdf7afmhp8ck i-c hat is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed 665u6z* kv9 qf o8vf;jc sy0mi2rsymd is increased from 2.00m/s to 4.000*fmdz; qucso5 y69m862 6 sirvjv ykfm/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 use*2gb0g;bpy6zra hd)iw8 ow80r esn d: d to pull a heavy suitcase of weight mgar8;b0s zod) geahin y8b pg:d2rww6 0* 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 exerts an upward force and delivers a useful power outputqra:i1 3 ubu)uxz4 +md of 0.10 w to raise a block vertically at a constant speed. At what constan:uxuiurab) 4d1 m+z 3qt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released t.k6 6 grzgaky.yl0y9 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 amounr6 .6ggy0yzla. tk9 ykt 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 helq6(j82u aj mm5nnk es,d motionless a height ho above a hard floor and released. Assuming that the collision with the floome,nj qums2 (86 ja5nkr 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 ;li; oc4w1t.e taelx)qe *qd4 sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimulc tiaweo l*.qx1)4e4;e d ;tqm average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unii 5 crmnw+wsi;bz-xxs- )pp;(3 hj(m wformly until it stops. If the ball travels 15 meters, what was the average net forc(wpjm3z5r)-m-ws i(x c phix b;w;sn+e applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but -9 et3bpn5celfl/9y cidentical kinetic energies and the three follnlet -b9 9/p3l5cy ecfowing 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 vertically in the air with an initial speol)nf.j gz) e5ed of 4.60 m/s. Ignoring air resistance,n)j5 ez)ofl.g 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, jjx2w2o0l z)q,reve f)hva n:(a4ee 8 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) between the boy’ s feet and the concrete do on tfwa04x2j,nl )()e e8eovz e:j v2qha rhe boy?

  02.48: An object of maspaao0rq. * 1 c;g ;bpjd2nb/cos M 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. po.;n 1rp2dbbcg 0j/q a*o;a cAssuming 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 from aheight H above thelw* q:8 bs v7:yvgx9pl ground. The object bounces off of a horizontal surface in a collis 7spx*wlb:y vl:q 9gv8ion 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 lenajaebh( 7vc866byb , wi,iu q.gth L is pulled sideways until the cord makesa ecyqa6i,u.,vi6 bh7 8 (wjbb 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 unknow+srk;8c vzpvvp42 t5kn angle. The sled, which started at the bottom of the vvk+cztrpv 2k5;ps48incline 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 of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a1mk ot*+s z3va 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, whkzo3+vt *1sa mat is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant forduy+ kuucetowfiv0; 6.m ob64q h9l/8ce F=50N (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 choices best represents the work done by the oi4m8hvu 0 tf/ueyq do bc66lku9;+w. force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest yo041 9m;pk8yvtjip)to -tbmz p/ t m: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 z4jtp10;pk )yotmpvt9/t -m8 io:bmytwo balls changing?

  11.28: A person throws an object of mass M straight upward wipo vyp.: nv+s(th 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 s (+v o:spyv.pntraight upward with initial speed 2v. In terms of H, 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 stretches a skqi+vahy b(5ad6x r4+pring that has a spring constant of 20 N/m. Th (+yixq5b6aar4d k vh+e potential energy stored in the spring is:

  97.10: A compressed spring has 16 ai;,4qt z6+il7e* k my3gu(sj ttjthgu7,eg7J of potential energy. What is the maximum speed it can impart to a 2.0-kg lq z it iym e( kju4 ath,,;ggeu7s7t67+*t3gjobject ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline xm+sp /fw:k7(4msyg sof 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 kinetic friction between msp k7+yw ssx(gf/4:mthe incline and the object for both trials.