97.01: A force F directed at an angle of θ above th jtya7 rf;t6fm0iqd0+ e horizontal is used to pull a crate a distance D across a level flooft;i+tq daj m 7y060rfr. The work done by the force F is

  97.33: A softball player catches a ball of mass 6ocxdj)l6z( p+9 nua2g7 ppt ym, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hdj+6p 92gy 6 )a7o xpc(tpznuland is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 metc0vef ;mz1h m2er above the floor for 4 seconds. During these 4 secon czem10;mv2fhdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratizp c9k8q+ a*jyk p hpz5/3j(fnon on a horizontal surface for 5.00 s. The bloccpj5h8nq p ky(kj/93a*zz +fpk’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 0 ,xi/0 fidhyo.l jf*h with uniform acceleration on a horizontal surfa.y0i od*fhjlx/hf, 0 ice for 5.00 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 directed to 83z.nnkj7e *:l uobj zthe right is exerted on a 3.0 kg block for 5.0 s. The block was euk7oz3n:jl jbn *z.8 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 exert) hidp,f5f8fp-h/uxhw e4 jm :ed on a 3.0 kg block for 5.0 sxfh8 fi:hfu4 wp ,m5d )e-pj/h. The block 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 at naqt;13 ;2ewr bpw:gt 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 owrtp; :3b;etn ag2wq 1ther direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it ky nljbm2nqcl n s yqp 4vh790a0y/q;+-inetic energy. An hour after the fan has been turne spy4ly9qnl-0 n anqh0 /cq2mj; 7vby+d 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 o5fhpzk9 z3c,u+ mv c.3.0 m, a speed of 4.0 m/s, and an accelerationph5oczz +c ,f9kvu.m3 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 boo ) 34z 0hrfz-nb, e7mggvqqi)+:nc uumkroom 1.3 m from the floor. If the janitor relocates the box v 0 z ,n iq-3 gq)fnmhu+c4:ub)rgze7mto 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 wwty; 3j+a uop1yloo (on zp0.5atts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abou5wo j;y0o l1ppt ou(y3az+no.t 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the rightdo )lao00z, iz, 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 masodaoi00z, zl )s 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 righto46(fd5z8x kmvx0 ray, 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 of F = 240N. The box, of mass m= 20.0 kg, ha0fmx a8v6(4r xoky5dzs 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 s-7oclr g-l8:xb8m sqe tarting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car oe 8x l:c87mg-lrb-q sA 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 t6 x+6ymaxqls6 ime interval of the accs xq6+a lx6ym6eleration?

  12.08: Through what distance does the object move during the time is.lmz/v v0;+zewvyi +e*7 ,y*jlnfd p nterval of the acced,eswzzfl y +7 *evjm0ni.+; /v*yplvleration

  12.19: The magnitude of the linear momentum of dt/w 1q *6nakqt*yux8a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a ti *6n wqu1tqkyt a*dx/8me interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kine5hafubv)fdbfw3 g 7mc:.u1:b tic energy while its speed is increased from 2.00m/s to 4.00m/s. :vbfwf1m5 37):hfub.cugb ad 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 used to pucvbt6d;cdv2v ne;i7 ru9(b3 q ll a heavy suitcase of weight mga distance d along a level floor at co vu73t 9cnd(ri;2d e;qv6v cbbnstant 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 use32 pqesgncmgeb. 4ly 1ks+/b1ful power output of 0.10 w to raise a block verticallyss1pg/+g2.4 bckl mee1 yb3qn 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 ff6 j11zgz: gcyrom rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth doefz:61 z1ycjg gs 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 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 height h g5* *aijaxi4qtv(g0ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best showsx*0tgv5(a i4jh*qa g i 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 sees a barrier ahead. :bfriyu w3mf -:rma8547tnvh If the car takes 95 meters to come to rest, what is the magnitude of the minimum average ne 8 ufywrm ia7fn4::5vrm-tbh 3t force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly untildk8u5ye* o+l0ida .d z it stops. If the ball travels 15 meters, whazi80a5d* +ok ld e.uydt was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idexy/i .,ss7d) 8lnmfp dntical kinetic energies and the three following statements. Which of the above statmdl /nifdxs7p. 8s),yements 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 clayh;ibpzi0n.8kh k8 h:f 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 whp b;88h:hhkizif.k0n en it reaches its highest point?

  06.20: A boy jumps from rest straight 0/rgar1 4)gsltxjpw fusm* gc9 y0*6mupward 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 contactuw1 amx*ry6 cg gs9m/r0sgl t j4)0p*f (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above thex8v+j0z id-j w ground. The object crashes 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 m+x0 zjwd8i- jvagnitude 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 oms p 8nwx;0r 5p8bgqd)bject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward nw8 qx b;p)8gmdr5s p0to 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 length L is pulled sideways unwh hi70weomej;m ;6 .ltil the cordl;w hei0he7 j.mo 6w;m makes 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 c-1u j,b6rbvnv9yj v; 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 positiu16-; c 9rj vb,byjnvvon 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 a 10-w,14iuid mph7 meter ramp to a loading dockui4,7w hdm pi1, 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 to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is r9(enmj8v dg a,4s(o 9hmn3fwapplied for the 6.0 meter motion of the box upward along the incline.sf((,r4h8 dwo9am gjvm3n e n9 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 the motion?

  04.48: Two identical bowling balls A and B are ew :eql4yu 6ec*ach 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 m* eel 4w6:cquyechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwa1ke:flb; l ks b5l5;66+iie hsk2mqnxrd 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 1fk5b6lsen sh+k;ilx6 2qm;ebk:l 5i 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 mchg7 3gcdjlu.2fh :t aq6e()N stretches a spring that has a spring constant of 20 N/m. The potential energy e7) jm6afchl:2.cg ugd(3qht stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum pc/mq s)j7cy jhx9a3q f7le)5iao( 2sspeed it can impart t)i cah/q 7yx2 sm9p5j7( sclafjo)e3qo a 2.0-kg object ?

  

  10.31: An object of mass M starts from20sw) 4.ok- l6 bbtraymti:sh 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 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 . b42y libst w:ha60r-skt)moof kinetic friction between the incline and the object for both trials.