97.01: A force F directed at an angle of θ above the horizontal is used ec7 nkx+xmo p ivwr(.u.r*,m*67 uehp to pull a crate a distance D across a level floor. The work k(moxnxerupvrep+i6. m, **7h cu.w 7done by the force F is

  97.33: A softball player catcaladtbv3awo-4e 4yw 6(le9 -ihes a ball of mass m, which is moving toward her with horizontal spa (bwa6etdw4l-4 ei-lyo9v a3 eed 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 hand is

  99.14: A construction laborer holds 70go)1lq pfk xa 20 kilogram sheet of wallboard 3 meter above the0f xp)q gl7k1o floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block xpue nm-)wx+f sm0)r 35eqa0v slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic ee+n- xfmsqa 5)wr )0xe3mvpu0nergy 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 w09kemj) l;*+vvi tudkith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J miv*9; + ketjv)ld0u kto 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 directew2uq*w6uh8y: m;y 7ia zspugf3h1se : d to the right is exerted on a 3.0 kg block for 5.0 s. The block was init6yuz*wi: w87g 1upq f3 hy2hmssue:;a ially 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 dir)pc ;c(l w4zi( gdhi(iected 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 p (hlic(g;wzi4i)dc ( horizontal 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 pond nlt. ), srn jdu4b)z/wthrows 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 co))ut z,l b/ nrwd4sn.jrrectly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after x(7kzie0wu hccr m1, p*dc,r9the fan has b(u kchcc 7ep1m ,*9i,r0zdxwreen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of(j 7j1i/8,jqb bne jcp mass 0.50 kg has a position of 3.0 m, a speed of ,jb(/j1ie 8qj7ncpbj4.0 m/s, 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 in the bookrn7q-,kv xmqm2) kq5s xoom 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. T qqx52q ,skm)mxk -nv7he box has a mass of 10.0 kg.

  02.32: An automobile engine delivers j:bqw dnz,;/y;pq 1nzvr0v ho-k( ln8 24,000 watts (about 32 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 magnit08z;qj:w /ln pvvqyo;khd(b1 - rn,nzude of the retarding force acting on the car?

  09.13: In the figure to th5 1e* qprsp/ rd)ov+vfe 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 = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of theq5f)o1 e d*rp/sv+vr p 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 b vy(zklx8m kk 7ck1m.6ox 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, has a speed of 2.50 m/swhen it reaches the top of thzcv1k6 k ly.mx k8(k7me incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each staig r ddo ;6-dnb-hm*tm (1l+surting from rest, along 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 distance F, what is its speed in terms of B? h1- ods*6rd(+tbnm lm;iudg-

  12.07: What is the net force acting on t6 wkzop i9q6/yyt(lz-he object during the time interval of the acceleration /l6(9okz-tq 6yyzw ip?

  12.08: Through what distance does +hd8 bqcsn t6.the object move during the time interval of the acc6hb. qs8t+d cneleration

  12.19: The magnitude of the linear mom 9ar;3o:wq3f6 mmfkbfh8l -upentum 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 mass lfro6ubh m 89-3w:; kfm fpa3qduring this time interval?

  14.11: A crate gains 36.0 J of k.844 h *opb;lnrns1yi rk-wloinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the fo.li;oh4 4 np *b1 nkyw8rsrol-llowing choices best represents the mass of the crate

  94.38: A force F at an angle .ldxx8 ih9yeo+62 du qθ above 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 and the suitcase is μ. yoq2.hixld 9+e68d uxThe work done by the frictional force is:

  14.31: A toy crane exerts an upward force ae6r8lwvv;w9vd1cqsu*) wk y3 nd delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?w8;c96v3*eu1dw v ls q)wvkry

  12.18: A 1.00 kg object is;pqsrf3:2 zss 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 choicess2 :pqsf3;s rz 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 ho above o w:0v4a,(g ud vcm(pua 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 m (wgud:vp0 oa,4u(vcthe surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahep5gp721d -ob ff ju09vrxqnrky2n p).ad. If the2k5n j1-9bq0fdyg7 pop v f)nrx2 u.pr car takes 95 meters 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/s slows down uniformly until it7r d; km8-cqt8b:an6.by gmfm stops. If the ball tf8 6gr- 7km8q:;. mb ycbdamtnravels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cargz * (pc,) t0m5npayslts of different masses but identical kinetic energies and the three following statements. Which 0)5 cya *npltz(gp ,msof 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 tosj t*f5m:tikk5x7x6s tsed vertically 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 reaches its6tk5 :j5xxt7itk smf* highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationa d 179czx2 so6m6dkn -w9gufufry 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 avmz1o27uwcfd-u xgk6 sf9nd9 6 erage 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 dropped from aheighocvwb8yl / 9u/tH 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 air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on the object whivw/uyb9c/l 8 ole coming to rest?

  12.48: An object of mass -6 bi byt ::cxa*yd.coM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a c:6-acoyb bd:it*.x ycollision 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 collision with the surface?

  96.38: A pendulum bob m lmi wm23e0y8vass mon a cord length L is pulled sideways until the cord makes an ang my2l38i0m evwle
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 unknh7th,i*)di -qi2 i ,1epvt , bu)dzgneown 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 to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its original positio )z ),ut*i-7gdpe i,,idh2qet 1bihnvn at the bottom of the hill?

  06.09: A deliveryman moves 10 5 uxg+k-ev iebz s +53t:z)ytxcartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If eacb5zxekyxti3+ts5g:+ u - evz )h 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 Fx5xc we xjx:tmr 8 /;1uo2ul*g=50N (as shown in the figure) is applied for the 6.0 meter moti;u 18wle: u5rtxmx2 jo*xgcx/on 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 b7dy -md)-v c tq:vb;kjalls 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, hvcdtjb-7v k :;)q m-ydow are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-z,v*1mfpt :qch ero speed v. The object rises to a maximum height H above the launch point. The pev 1hf t,m:qpc*rson 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 spring c3a bar p;o94voonstant of 20 N/m. ar94vo;ab3op The potential energy stored in the spring is:

  97.10: A compressed sp ,iws+73i so,oil/ wfaring has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg 7iwo a+ ws3f,s/ioi,lobject ?

  

  10.31: An object of mass M starts from rest at the bottom ozt/q)d vsp/ /u(7upzyf 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 diagrpy7/pz (usd/qzu) tv/ am. 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.