97.01: A force F directed at anz1 v9 +uq:tb02dn dpeu angle of θ above the horizontal is used to pull a crate a distance D across a level1b vqu9+ptzne:0d 2du floor. The work done by the force F is

  97.33: A softball player catbaayfo,dh;6i4r 1 /huches 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 decele6,1hrdu;4fb ia a /oyhration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer nefmu5)3 ;;8gwyx ukh holds a 20 kilogram sheet of wallboard 3 meter abov3xw85uk;g)mu ; nhefye the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wit9+mwuu, w,gqo m4qpb/-av8rc h uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrea9mw 4u m+ qqcwg8v/-pr,, buaoses 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 uni7 kyax e(ir :rwt.(k/uform acceleration on a horizontal surface for 5.00 s. The block’skr w:((ykt/. eur7xia 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 right is exerted on a 3.0 k7/45 iqtw 1nyoffm eyn xe4-9bg block for 5.0 s. The block was initially a4f4 ft/o qi x7mybny ee9-5n1wt 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 exerted on a 3.0 kg bloed(y dylh6.7a 6)zrl qck for 5.0 s. The blq h76rdyea(6 ldy)z.lock was initially 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 9r prns/ -czx ,cuoy3,at reston a frictionless frozen pond throws a 1 kg hammer in one direction. Af,r/zyu-c x9p scn, 3orter 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 situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the l,x (t7ojus -yxu(t2bfan has been ty 2ux(t,lxt 7b(juo s-urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blogc+i8 ejjlj *)ck of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelec*j ij)lje8g+ration 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 * .augn i.dms9zoja61 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 i6.a1asd*gjzm uno 9. do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 hormxw:i3/ (p q1bf,zo r0a1p rnosepower) of power to a car's driving wheels. If the car mawp31 pxzoboiqn 1:r0mra f,(/ intains 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 boxp du6schm l; be,m9m;-t e+(ah ep1x2ttom of a rough, fixed inclined -ummsb2dph ;(1ee9 lm;6x,+cexthpa 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 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 w:y(o /6lstpjf0f tn 5sith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top s6t s5/ft:fjol n0(ypof 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 thgy4;oh7w s0b pe right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B.bp7;4 syh0ow g 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 the object during the time interval s6 r(c jnpg 8mdp)xf*4of the acceleration?rf4)dg c* pjsm n(xp68

  12.08: Through what distanceg.0*1 epyytz j-n6p2j kr0 gme does the object move during the time interval of the acce6-*y ngr0j1y0 p.mtpeg j2k zeleration

  12.19: The magnitude of the nvtz aogo g6(n -u2j-xk,k89glinear 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 the change in the kinetic energy of the ma,ktg69uon n-zvkg ogx(8-j 2ass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy b--ong or83o7ia 3o(zo q9qngwhile its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices bestz9roo 3a on-q37i8oobg qn( -g represents the mass of the crate

  94.38: A force F at an angle θ abovvk.;e:qk /rc/ ly 9ehie the horizontal 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 floor an/ eq9lk:.rv ;ie hyck/d the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force any0bu2nh0g :rhd delivers a useful power output of 0.10 w to raise a block vertically at a cons:ugyrnhh b 020tant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objecn r:a17f+ufm vf vuj+fy 1m((fk nc8;ct is released 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 representsn vfan (fc+:kcmr vj ufuym1+f f;7(18 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 balluo1 n ceze:;k:3 (5 -lhknwpwb is held motionless a height ho above 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 surface? nz kh-l3b1;pnue: (5kceo:ww

  07.06: A 500-kg car qc/ y:i1qi3kgis moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 m c3k 1:gyi/qiqeters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/ -6j 1kn q3 l9kqlm;b8ye;zonls slows down uniformly until it stops. If the ball travels 15 meters, what was the average net forcek31b lnkmz ye 8o-6j;nl;9qql applied while it was coming to a stop?

  02.26: Consider two laboratory carts of41 qylf3*ppmrfk1 ll- different masses but identical kinetic energies and the three followingqfpr-4*pyf ll1m l3k1 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 inis91w:vrbvu w9tial speed of 4.60 1:w vur9s 9bwvm/s. Ignoring 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 4weergim+ b5; 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) between the boy’ s feet and the concrete do on the b5g riw em+e;b4oy?

  02.48: An object of mass M is dropped from aheightH above the )da9wqw tkavif1ho6k2e 58(pground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assumww5p6v )9k1 8(qadktoiaehf 2ing 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 Hgt o+zodj*4v;3 v m4zcikb f:5 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 mass during the collj :z cg vmvo5i;4d z*34t+bfkoision with the surface?

  96.38: A pendulum bob mass mon a cordqsi(qf q08pc9is(y)tv ( iv +f length L is pulled sideways until the cord y9t(pv)(iq fss( qfic0 v+8qimakes 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 inyt5 s3:u;gy btcline 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 3u t;yyb5gs :tto 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, a),j3rzk( a sthl-edl *long 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 the cartons (e-j3dl )rhs t*,alkzto move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appliedc* 5kb5t+m tbe 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 +tebb5 ckm *5tdone by the force F onthe box for the motion?

  04.48: Two identical bowling balls 2la8fb h y,mx+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 ch82 +b,yhmflaxanging?

  11.28: A person throws an object of mass M straight upward with an initial n e+gh ,y hxg5l,k*d4:tmmffkg:(8me 4stjf a*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 what maximum height does the object of mass 0.5M rise above the launch point? ,mh g, 4d* e(ghkatgs4f:y* +ef5x :fkmm 8ljt Ignore air resistance.

  96.20: A force of 10 N stretches a sprn-d zy e r/yp2+:cjir,ing that has a spring constant of 20 N/m. The potential energy storedn,-/r r c2z:jydiy+pe in the spring is:

  97.10: A compressed sprincw/h(nw m ypin)xcm yq;jcx09 w9x+kx :e89*pg has 16 J of potential energy. What is the maximum speed it can impart m)q *8i:hpx k09c+mwcn/(9 9 ecy;xp ywnxwxj to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the boznx(n4j 1pl .;zms2w qttom 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 sj(l;w14nnz2 pm.zxq 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.