97.01: A force F directed at an angle of θ above the horizontal is used to pus-wm ,o,) d2mw*d)k1s(uu2gfjy hx e ill a crate a distance D across a level floor. Tsxkd1*(u,wfg -i22mdju yohe ,msw))he work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movi lex/crn* ) x4gt/i,fkng toward her with horizontal speed v. While br * cx/et x/n,r4glkif)inging 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 a 20 kilogram sheet of wall6p f mz35p6ibknf .:w9zj4 :pkd *rbjoboard 3 meter above the floor for 4 seconds. During these 4 secondsho*9 5bbn66fz o::p4. pdmjj z3fkkrwpiw much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a h;o bvl8b1bg;9 ar*tyoorizontal surface for 5.00 s. The b1*;btg l8 r yvboo;ba9lock’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 z .smhqf,m8(z with uniform acceleration on a horizontal surface for 5.00 s. The bqmfm(zh 8sz,. lock’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;4) gakmsn)l*wsbs ; jqr m.;l to the right is exerted on a 3.0 kg block for 5.0 s. The block was ;* ms qg).l)4 ;k;bwsmajrsnlinitially 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 exerted kv4fwwl(, gc1 on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on fk, w1(4wg vcla 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 thbq18wrk,* xhrzpwx5y 8zxc-3 rows 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 dik- xwpxqcr 583w*1zrhx yz, b8rection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kjsr.) r bmx9x (k.w.9 r-qxpflinetic energy. An hour after the fan has been tu)xxf.(9-s 9 wrjqlpxm.rb.krrned 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 posit3,lqp pd7l8yyov ;yn6 ion of 3.0 m, a speed of 4.0 m/s, and an acceler,v3p;7 8dpyyl6 ol qnyation of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old texe5l lvv1(kp;9de4j.eme jq: otbooks is on 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 hasv5;evd:4k el mel oep.9(jjq1 a mass of 10.0 kg.

  02.32: An automobile engine devo93r xq-0nce livers 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 magnitude oo qrecn39vx- 0f the retarding force acting on the car?

  09.13: In the figure to the right, a box moves wi xu a ao/te8htex6)8-,y g( rjfjel;9dth 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 i 8lj8ax 9-;/,6u)eoj ex htyfde agr(ts 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 m/s at the bott4rhwa g 1wvvo1l;azo, :mr2/fom of a rough, fixed inclined plane. The box slides with constant accr42/a :wrl,; vz ofgahw1mv1 oeleration 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 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 a strarcoh7j0g obm 54ew6g3ight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car oo6bg7gm054 jec h w3rB has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force 9omspmclq5p-q ce +.tr5w3q 2acting on the object during the time interval of the accrw2t. p clqsq p-5oemqmc35 9+eleration?

  12.08: Through what distance does the object move during the time interval or; 3t*g02 ,uoloa,yz/. r:txmlr(vaf gr0s ekf the acxa o2*,g fl;orkre :r0s( 0/y.al zru3,ttgvmceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg pointhe5/nd8r;k jt mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time intervae8/5jtk nhr; dl 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 kinetic energy while its speed is inokvlqr 6 ve8hc8)pfzo69-xr +creased from 2.00m/s to 4.00m/s. Which one of thr- 9v8vq ze+ ofor)lpx6c6k8he following choices best represents the mass of the crate

  94.38: A force F at an angle θ above xl/xn1(rad t/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 sui 1 xtxl/r(na/dtcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a wihs c9.jy; j)/fs2apuseful power output of 0.10 w to raise h sja cs. wi2)f;y9j/pa 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 surfaceybk s)w:q71z zip 7zg1 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 choices best represents the amount of work done by the gravitational force acting on the Earthw k7zp:b 11is)7 gzqyz by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above p.rt / x 80x dihce6zog:-v7qua hard floor and released. Assuming that the collision with the floor is elastic, which one ofixogc 6z/d:txe u-p87hvrq0 . the following graphs best shows 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 bn u9qe8 pyhx -:dp)nf-5d5 vdyarrier ahead. If the car takes 95 meters to come to rest, what is the mag -enf9) qx:- d5hy pvpydu85ndnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unifox)/u5d,y d mdrrmly until it stops. If the ball travels 15 meters, what was thermyx5dd/) ,d u average net force applied while it was coming to a stop?

  02.26: Consider two laboratoew * 4gx(*wi1 3dlqwrqry carts of different masses but identical kinetic energies and the three following statements. *xlw w* q143rg edqiw(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 with :3bss d;xxpr (an initial speed of 4.60 m/s. Ignoring air resix:rpd(s3x;b s stance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward f -;hk-jalp/ rirom 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 /arj;k--l p hiaverage normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mgyaub4+nk+e8 ass M is dropped 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 air reynu+b8 4akg+ esistance 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 dbng ki/r. *whsde2.4gropped from aheight 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 ofw.e.ir4/bhs2n*kg g d 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 unt5ub(g)j)i fasg owf8;hu )1ycil the cord makes angh8cfi (w)yuub5) ;g)fo sj1a 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 sled w5x6,9ztrqtm3y- lj r, 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 itjy3,t65rl-x tr m9qwz s original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp ts3)wraj ;h6ol hj3;lo 6rsaw)o 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 the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as+mn* f;j4b,vuoa ;a f0oee 6jb shown in the figure) is applied for the 6.0 me 0+6jfum4o; f*,bn;baavj oeeter 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 are each t vy4b) cw,b:rdropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ytr4:bvw,b)cball 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 otjpc *kf ysjth+ois5d, wl)37oyo;ld* l k6 ;8f mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. ly,ks;w*58 6+ ;t hljcl3*tj fok 7sodopydi) 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 spring constant of+sbxhdq h-f d1oc1w/z fp77q + 20 N/m. The potential energy stored in b7h/ pqozw7dh-q1 fcsd + x+1fthe spring is:

  97.10: A compressed spri wx5 zegq,9k3zng has 16 J of potential energy. What is the maximum speed it can imparz zge9,35kwxqt to a 2.0-kg object ?

  

  10.31: An object of mass M starts frocsfy8ku: pi/. m 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 of kinetic friction between the incline and the obj icukfp.:8 y/sect for both trials.