97.01: A force F directed at an angle4w:nynxr , 7bj of θ above the horizontal is used to pull a crate a distbj7n:nr4w y,x ance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moviocpuyxg 9+w+.i 1p z;ong toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distancg9zo;pw ucy+p.ox1 +i ed. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdnl b;zru:1-k ms a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was exp - mk;:1nurlbzended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizonta * h*(fv(swlt3+zr,lsj1cldhl surface for 5+jfd h stwvhll*c3l(zs*, 1r(.00 s. The block’s kinetic energy strictly decreases 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 hori+civ0vtqr qzx ;c ,)7rzontal surface for 5.00 s. The block’sivv0qt c)xz,r7rq+ c ; 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 exertejfqnui.uf5zt /m 3--nr, owa.d on a 3.0 kg block for 5.0 s. u,3u-.jnr afo fn-mqz.t5 wi/The block 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 l +eqnv2/8u)wwap scd4tf5,f6*x+n(b ykch n directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rhfl5q+wybnadk+ 6*, c)wnxsn 4u/2t8v f(pceest and slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiallygthep6( 7ead ,( p(ipf at 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 correctly descripee7 i(fp(h(gpa6 td ,bes the above situation?

  03.14: A fan blows the aiwk 2+. lfj3l2ey8hjle r and gives it kinetic energy. An hour after the fan hasyl3lh+8 el j e2kw2.fj been 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 3.0 m, afjluc/ t )7ad + pog,i*t1foq b*f),ik speed of 4.0 m/s, and an acceleratic+f,kffq1utpai)7l*g/d,)too *i j bon of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is 0nijhoa*x g. ot923xlon the 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 a mass of 10oh2 0t9ilj *3 gaon.xx.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 3o6ant. xbo,/ p2 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magn a/b.px6n,oot itude 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 aq+ cmmcdk-t* m8c qc/(t 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 it reac/(+ -c8q c*qmmk dtccmhes 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 movjy 9evbhsa -6(es 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,jvb 6h-9 ay(se 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 -b; j p* qd3i( ce*un+tkr-bswrest, along a straight road. CarA has drbnuje w*- qt+b3sk;*i-pc( 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 the object during the time intervaldnje/9 - x5vt3dwqn)w of the wj-n3d5vn/ ) qxw9edtacceleration?

  12.08: Through what distance dt 3ik2javla )r2j;c0i oes the object move during the time interval of the ac;t22 3j0i jaiavl)krcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg p0urpk 9zjr-o)j-i .fooint 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 mfjiorr).-p0 j z-ou9kass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speedg9y g7xmrp*+j)q bev.ui+: vk is increased from 2.00m/s to 4.00m/s. Which one of the following choices best representsp y*gbv+ +:e u9jrxvg.k)7imq the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavyn depm5pia) +00 /xxke suitcase of keme+x 0/0 )pxidan5pweight 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 exerts an u0ew hrt2 soq,/2v.t hu ajp7inc/5j ih(47zfcpward force and delivers a useful power output of 0.10 w to raisez po(24s/u7hicqh7hje jt f/rtw vi n520.ac , 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 g-e 1m -jd:bz.a y9nsg:x qll0Earth, 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 xza-esmblgd 0j-9nq:g l. y1:.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 hed (ki8zbzsd2xo+lumw 2/ l a7/ight 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/7/kxmd 8+ zalis(2udloz 2 wb energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is m 8o/ r05twiy35 v 0ck:qwza.pv6nnrftoving at 28 m/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 net w50fp t:.n yzo805va6vqnrrk3it/wcforce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stopsch fh d4z6uo-1. If the ball travels 15 meters, what was the average net force applied while it wh ud-zcof614 has coming to a stop?

  02.26: Consider two laboyi *jq6 0bgjjn) c)s)gratory carts of different masses but identical kinetic energies and the thre cgjb0 j*g6i n)js))yqe 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 tossed vertical,tj bi ( g5qt1.+rd5 e/jsabrmly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reachese b gq/j5,msitdjt.ba5(rr1 + its highest point?

  06.20: A boy jumps from rest straight upward from akb7i u.23ihro:2x9/qurl jl t 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 9hoqu :23i b/2 .u7k irjllxrtboy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The objecv6mbp jymu6/.lrv(. ,7zteqn xkntc.5j uw ;.t crashes into some soft earth and comes to rest by compressing the earth a distance ofqzvx5.nvyc6 (mmu nk 7, rp6/e .j.bt .wltj;u 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 from ahv.h 7r skfhr67eight 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 .hr76hv skf 7rforce acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways urujt/ 410mxqf ntil the cord makes a40/f1mtxj rqu n 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 unifory0br2 j5ddz3sm incline of unknown angle. The sled, which started at the bottom of the in30 dj5bysdr 2zcline 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 k,s,t* (qy1d5 upqcqj from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton ha (1j, d5s*, qctykpquqs 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 Fpcy ad1g3 8h+y=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 represeg31 adpc +yhy8nts the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from r6qocn*(* z; upuue7:.c yzt peavs9d3est 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 t ;u*vp*u .(qo nz9 p:e e67ccudasyz3strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of:5xtv8 lgr+w4bss r8* hwv. ej mass M straight upward with an initial non-zero speew5wb8:es8* rrtj+hl s.v xg4v d 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? Ignore air resistance.

  96.20: A force of 10 N stre:zy w)wzw1-ar a o/zf6tches a spring that has a spring constant of 20 N/m. The potenti/6zwa:-yzzfa)wo1r wal energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wgxg7qbl s(0 jsr 7- (k)jwbf:chat is the maximum speed it can impart to a 2.0l:bjc-jw7(g)q7 fs sx0 g b(rk-kg object ?

  

  10.31: An object of mass M starts from r3faj kq.9z( t(p*qrgf54 qvq hest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one ofqpq(kh vtr34.9zqfafj5 q (*g 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 the incline and the object for both trials.