97.01: A force F directed at an angle of θ above the horizontal is used to pul , i5;qbvzxa+8heise-l a crate a distance D across a level floor. Thxi+qibh; a- 5,zees v8e work done by the force F is

  97.33: A softball player catches 5iis4fzm;82 v g)tzuna 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 decelera2m;8viug5i )fn4tzzs tion, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboahd0nhwq,( (jkrd 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendeh (0 dkj,qnhw(d on the wallboard?

  17.11: A 5.00 kg block slidej/qz w5bp):o3qe wr1es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stric qb:q3) e wp5/zwjero1tly 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 blo3ekhlv x b*)(qck slides with uniform acceleration on a horizontal surface for 5.0* h)lx(bevkq30 s. The block’s 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 do gj h )t7dvi;,f66-kwswzoh6mlf/w ; e11 vmbirected 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 mo6w ,tsviw djf;g 61k lh1z;-b vme7)f/hw6osurface.
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 block fozd3qw67 ap0 va s/p6eral9 o.sr 5.0 s. The block was initially at rest and slides on a horizontal p.sr76le3a9dpaqsa 6z o v/ 0wsurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionwdf 1t qqo:w0 jgo nd3x0-;s/nless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction wn3f1 dq-0n0g o sx:tqwo/dj;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 afte c8pmr6 y*gy03pjsq ddm9r/ u6r the fan has been turne6r jpq9 cdpy8g0*usym6r/m3 dd 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 off2/* t tl+*+pbjbf6vvs m. xgd 3.0 m, a speed of 4.0 m/bvftfpsv*.+26ml/ + j b xtg*ds, 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 innfx-kmh:v44 i0 bv, eu3zfgd0 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 uz:b gev- fvmf4x3hk4i d,0n0a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) o0k: b 1oxcl8kva.zeav, 4ntu+f power to a car's driving wheels. If the car maintains a constant uo4akknezva :0t1v8xc l,b. +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;)hq d2(gk japmuq*0m/s at the bottom of a rough, fixed inclined plane. The box slidu) ;0h2*qmqjpkm ag( des 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 with speed 5.00 qiwmt06k5s0g 2,kohmm/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 ttk0i6ks0wm5 ,m o2q hghe 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, ah vt-nyzf,m*a b;,9o wlong 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 same dish;ytov 9 m-,z wnb*,aftance F, what is its speed in terms of B?

  12.07: What is the net force acting on the oby(jxj sj:ke(3p)cv hg: 86nwch*6ehs ject during the time interval of the ac xwch6( hg:8jes6sckv)h eynjj3: (p* celeration?

  12.08: Through what distance does the object ax5nv c 5d8;ramove during the time interval of the acc8nc x5d a;v5areleration

  12.19: The magnitude of the linear momentum of a 4w z8hdedaw2r 35+y 6pa.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 changadzaw rdp83h5 6y+ew2 e in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic pj9/ec 0vqqn c6 0 qn;5shbv+henergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the fo bchs6j+en/q nqq;hv c 0pv509llowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is ..ky cy/u4du)a4dbpb used to pull a heavy suitcase of weight mga distance d along a level.4y4y d d.u cka/bbu)p 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 d *nhg5.kfip d y 2d:fxsz sl/gz8)5,cgelivers a useful power output of 0.10 w to raise a block vertically at a constant speed s)nd5g5g kf:8,cz* ./zxiy pgsflh d2. 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 Eartx8aw3bxa r, x6cp0; rjh, 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 x3a wc,rjxx6ba8;r p0the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is he.q jrzab8o 09pwe(a k4ld 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 (9p k.q4 a8rzeawj b0othe 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 sees a barrier ahead. If 5 az:jkw3,x spthe car takes 95 meters to come :5sjx 3a,zk pwto rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If 9-sbau/vg2s 3os;y 4 tq-crfq the ball travel3t g2 u rvqfy49ss-sq;obca -/s 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kineticqh* kin5kuor//,8lg zx x* f.o en z5quf/lnk*oor hk 8.,x/*xigergies and the three 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 cla:t+v pxgg ppq.no 61u+y is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance,+ +pgug6:ot pqvp1n.x 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, stationary concdu4,t()- s dueh k2uourete 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 cuku4 2eo-,d htsu )ud(ontact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is d;e u2fr2;dp/m3zof jh ropped 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 ed2o; ;2mh 3zpj f/fruair 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 the ground. The obv mc3 (3gllzs71g3n5egakf)i ject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height 3ck5 vi 7 mng3g(f3gsl)z 1elaH/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 length k *:,fly h pbu/1nc2yiL is pulled sideways until the cord makpuif1 yn*:bkyh/lc 2,es 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 unknown angle. The s2mrc8m1azx . pled, 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 src1x.a m m2z8pled 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 a 10-*lmcar;(+-x mt h--z g+rztkk meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If( m-z ;*--+czthkr k+lx mtgra 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=50N (as shown in the figure) es(:h9 (oyc l7min b5uis applied for the 6.0 meter motion of the box upward along the incline. The mass of the bloim eo5l9bnscy(:7hu(ck is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppedc2t h*fz se,yt;q. owb 0hp49j from rest from the top of a tall tower. Ball A is sb0pw4 thc*hy29fq ,o;jtez.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 changing?

  11.28: A person throws ay6me80b ugm (fy 1ko(kn object of mass M straight upward with an initial non-zero1umybm68 keyf( ( gk0o 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? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a :iogx c* cjz+k n.tt+/spring constant of 20 N/m. The potential energy stored in the spring is:/c*ng:++zj oc .xitkt

  97.10: A compressed spring haw1iz/2i8 nj wohb 7fm+s 16 J of potential energy. What is the maximum speed it w1h+ fij7nizw2m8ob /can impart to a 2.0-kg object ?

  

  10.31: An object of mass j3rrvdoymf3+-12 dfg-m ey bo (h*yi1 M starts from rest 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 i*1oybdd3 e1ymr- f+3(-hryoj2 mgf v 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.