97.01: A force F directedio.l 56uq rj icr.vr58l e1pc*v p0ob ts6le9+ at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by8p+.qv or.i6 6lc1u0ejr v*besr5lolp5c9 t i the force F is

  97.33: A softball player catcheovr yhkp5s2k( 4ap9 ;bs 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 deceleration, the horizontal force exerted on the ball bvpyo; kp (khrb4a5 2s9y her hand is

  99.14: A construction laborer holds a:0rwyj bp; 7ju 20 kilogram sheet of wallboard 3 meter above the floor for 4 sj;ubw0r pjy:7 econds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sii x,8ndc qu xm-r5i: x59s8nllides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2:idu,i n88nxxis5x5rq lc9-m0.0 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 uniformy9 tb35i urv+rg b i1(e mjk:idfi1:)f acceleration on a horizontal surfa53b+r )( bfjy1dkiu91i:fv: itremi g ce 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 the right is exerted on a 3.0 kg blon835 py2ualbx ck for 5.0 s. The block was initially at rest and slides on a horizontal s8au x32yn5plburface.
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 blqw0h)pqq4fj x*of 3pu9-i6g m ock for 5.0 s. The block was initially at rest and slides on a horizofqqm)f9i oxqjuw- 4p60ph3 * gntal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen po e9(t)(sr .-/3endfrmi+ uchy bo9ff jnd throws a 1 kg hammedbf+ ur frtom- iyj3he. )(n fe9/cs(9r 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 describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. e cde12v3j :t8iu 5rsvAn hour after the fan has been vetc 5der1i82:3u jvsturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a b x /uxde()/cbkm 1 9gzlds,vg7lock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration of u7dx,bed // c)gmx 1v(s9z lkg$1.0\; m/s^{2}$ . 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, xwth 3ry8*xwkroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, x 8h,y3rtx ww*how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine deli xincb* od05vs7.9m vtr uvr;/vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car 0d /t voi.b7x;vc9*v m5nrsur maintains 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 n d(f 7;+ 0u)cd5qolwktvbipc +c2u(c the right, 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 = 240Nbkuc)7 tc25i u o;d v+cp(flwdq+(n c0. 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 movefr nvp3za 292ev+hz7q s 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 Fraz27 n+2v3qez h f9pv = 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 sqcpm )l62b.-lh+* pwqtvp 2t a straight road. CarA has twice the acceleration of Car B. After trc mt*ws+-qh22qpvb p)t 6.pllaveling 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 of wa4 (/be)-6oapzhu rb the acce(o b h/zaw- 64e)pruableration?

  12.08: Through what distance does the obj9lp;0ll 8k2txt.ls uzect move during the time interval of the accele k ll9xzt8ts2 l0lp.u;ration

  12.19: The magnitude of the linear momen q;7szv tud1y-19ayobu l* j*gmo2*t7qb lsc-tum 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 kine yq* 77 btmutou2-l- oadscsg*v1; b1z* jq9yltic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spee2+c2iz x; q ps0jg6zdgh3t4swkr (a5 md is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the c 62dgjxi+gs3 kcz;5h p2w4s am0(rtqzrate

  94.38: A force F at an angle θ above the horizontal is used to pm01huitmf 5jc/2u kc e:.;u:k bgz5twull a heavy suitcase of weight umgbu2m.f/;5 tzi jwhk1t::kc5c0eu 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 upward forc2d d qr.d+29/ifwtra ue and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what coa9t fdr .2d /2q+wuidrnstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released frtt8/*vcynv kt, ;v lgwk06d uv7 ru35yom 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 thev0ck t l67ttrkuvy5vv,3 *;ud/yngw8 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 p+ sqg5-cg(usis 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 5u+ pgcsqs( g-the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/skiut ; 4v/sho/. 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 f/;stohvk/iu 4orce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down 2 smuh*+ch ml8uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while2 *hsu+ hmm8cl it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kiamz( n37d8mgh i9y3hj;h 7te fnetic energies and the i3y8j3z hh97d me gm(7na;fththree 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 vertically in the air withb ww g29nz*my3l(zs x7 .j z9g8-vkqrx an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches2bgzmyjlqx9g8r9wn 3v *zks.(zxw- 7 its highest point?

  06.20: A boy jumps f yu e1294vgb2hf w 2h/uvzue,urom rest straight upward 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 dista,veuguf2vwz2 y1/ 2h9uh4eu bnce 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 boy?

  02.48: An object of mass M is drm a* 8rgc 1*n.8g io8vo6 f73rjir/c7fvnd ftwopped from aheightH above the ground. The object drwf 6jvnin8r/g*c 7 m3a*.ic vfgo 8o7f8tr1crashes 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 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 7dr)x u8jguu.;z-q9 gyqtn ,eaheight 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 force acting on the mass duydg j7uqq-g,; uzn r8xu9 te.)ring the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pullrrs l.-md7 ltt0 s6o4sed sideways until the cord makes an r-46so s .dmtt7rlsl 0angle
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 anwdvgu6 (dccz9ywd c( zie/xx0gq(o*) b4 v5 o4gle. 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 poweoggcc6wvd/b4x)5 o (id4cz d v0(*yx9 uz(qsition 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 tx* 2k)caz8biv6oud5s)u tj6pgpf31ghe sidewalk, along 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 t ou xp s2u*g)p6ja)k3zvc5gfd6i8 bt1 he deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is ap 8pmm4q xnv*;ggkz6+zplied for the 6.0 meter+ mxpgq z8vg4k;mn*z6 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B arewea4lbh19m4 s each dropped from rest from the top of a tall tower. Ball A h 4 9s1w4laembis 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 an object of mass M straight upward with an i7adiem)a i: b6p* z -9)zwy5*todulqvnitial 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 straight upward with initial speed 2v. In termse w o5zva) ab*iy *q96-d)l:zit7 umpd 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 spring con puda;r7g h09ystant of 20 N/m. The potentr7udhpa ;9 y0gial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentiaw-hdy;;:(g cnt ud9d lx2l e ht)kl/z/l energy. What is the maximum speed it /w zn xke)d2lul-d(gdh:; 9;h t/y ltccan impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts fr3xkmd,i jgo9r+vrf34 ,z9poxom 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 appliexdji3ko,p , xrg3 fzro4 v9+m9d 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.