97.01: A force F directed at an angle of . thuzi ,(kxl: θ above the horizontal is used to pull a crate a distance D aci.lx tzu,h: (kross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toivci0f 4b.cu3 ward her with horizontal speed v. While bringing t u3bi4. cv0cifhe 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 wallb;4gkcay t8h;wobk67c8.x ev2i u cp- noard 3 meter above the floor for 4 seconds. During these 4 secondshow peo8ka 6y2 th; k4.bgccu;7v -icxn8wmuch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal suabe., ico92-s 7;i)dxcdb7 yjikx 8kzrface for 5.00 s. The block’ss kbkce 7,z8;a j9 -xcdb.ixd)i2oy7i 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 with unifc.a4/vs3apzun ) s b2torm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strict ct . p2ab3/snzusav)4ly 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 oeix7fgb: :(a to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest andaf (:oe ig7x:b 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 on a 3.0 kg block forhu2.t x-hrp* j 5.0 uh.pxj *t-rh2s. 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 initialov5 t5k y3neo4ly at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves oovn5y4 t3k5oe ff 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. ,/ tk2gqzyeq ; An hour after the fan 2 ;zq,/qyetkg has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has ag)j9 ns1yp/.y (s zvdw position of 3.0 m, a speed of 4.0 m/s, avwny 9/z)s dy1p.sg(jnd 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 bookroom 1. zc+5 q*tck z-ya* e3jxvi:t3c3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floo-3 aq*z:3*5t+ cxzc ivetkcyjr, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile0( v adyj9fufe:nf6n: engine delivers 24,000 watts (about 32 horsepower) of power to a:fu v:0 fd6(en jyn9fa car's driving wheels. If the car 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 the right, a box moves with speed 5rk 4v dp9,1 aqt4 ;ui5nomu0lhxf/*yp.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/mh dp o4lxi*k 5n, rtpqauu1yf ;4v09 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/1d(pwe+v icn1 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 vcdp(1+1i wnethe 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 k 1r(jw r5qs1y/rdy8/ h f (rb-*dyno0idpr. rstarting 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 Byf yr(5dr p/bhr1o0 rdqyd rrw(ki/js.-n8*1?

  12.07: What is the net force acting on the object during the time inv 4cweh w36t5tterval of the acceleratiowe4h3tc5wt 6 vn?

  12.08: Through what distance does the object move duriq1(;9 8o2:qanosqspa x(zg qr ng the time interval of the acceleratiqorq(s8 2s:z oqpqn1gx ;9aa (on

  12.19: The magnitude of the linea m ;jnue4 7ydh)2ev;hlr momentum 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 during this time in) 4;;7d evnhlj 2mueyhterval?

  14.11: A crate gains 36.0 J of kinetic energy while+mcno2 9m c:ar its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cramm:9n rc o+c2ate

  94.38: A force F at an angle θ above the horizon2 s:kxgh9r9vt*vw5x t tal is used to pull a heavy suitcase of weight mga distance d along a level floor : s2 *vxt9wgxhv9 k5rtat 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 delivers a useful power outpdjr9r8vql 2:5o 3:0cf oam cddut of 0.10 w to raise a block vertically at a constant speed. Atl r59:oddqm0 j2 accd or83vf: what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rwg h*wb71* 1y8 658 ostwe)dwayhddbc eleased 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 choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg wd y)d6hhw817ywbdb8 5ocw a**e1sgtobject during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard fj ;*-rnloyds10l / kqyloor and released. Assuming that the cky*; d0l-o njry/1 lsqollision 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 the surface?

  07.06: A 500-kg car is moving at 28 m6oylqtqpfmo 4 v971d9+u1zdg/s. 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 force necessary to stood fql9u 19 q4 1z7p6do+mgvtyp?

  00.26: A 500-gram ball moq 1p:i 1 veglg8ou4wd2ving at 15 m/s slows down uniformly until it stops. If the ball travels 15 mete:4ogu p1l vgqe1wid 82rs, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mas f.fg z4( pop5-c5ybgeses but identical kinetic energbfp 5o(fzgcy- 45ge.p ies 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 clay is xwo j47xxn10qxg* k4ktossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enkqg104x4 nxwxxk7*ojergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from pi p7i(qx,b :,pkb tfje:78ru /flo*qa 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 mp p: f7jit,:(/oru ,pqi*kbfbx le87qotion. 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 dropped from aheightH abov-m9kz )w o-do;sqym z4e 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 neqmwkzm z)yo-os4 9;-dgligible, 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 ab(6 qbnrow0jb*f l9y: (f2aiog7a;qkjove 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 during the collision with the surfaceak7 6 go(b(qo2lj:i;y*0j rqfwb 9fna?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the cor-( vrs4ehh tl38w8wr xd make3ve(8hlw sh8-w r4txrs 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 sled, j1wjqps) l(rpp l o+8/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 posiw8ppl/ j+ )rspj(qo1 ltion at the bottom of the hill?

  06.09: A deliveryman moves 10 car )fe.pjzh.g j*tons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carhzj p.ef) gj*.ton 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 applied fo.48gyf)o)om fzni+ tfr the 6.0 meter 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 theo.im t ) 4f+yg8zn)fof force F onthe box for the motion?

  04.48: Two identical bowling balls A and B pn7:yom/ fmu; *atlc +euw a;9are 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, how are the mechanical energies of the t ; ;eya7+* :noctufawmp9u ml/wo balls changing?

  11.28: A person throws an object of mass M straight upward with an initiakl-49s fyc// b7vj ofsl non-zero speed v. The object rises to a maximum height H above fsjv y b4/l7f9k o/-scthe 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 z7q vzwpa j18k xm5dv1fk2 opd/-9br,N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spring i,z p7vk zr- q wp112v5xfka98bomdd /js:

  97.10: A compressed spring has 16 J of potential energy. What is the maximumyzbjxx y7mlkdr 564 o57n5*nf speed it carx5dnm75n zy46 kl xobf7*5 yjn impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incl ws0or*b72hte ine of height H. A person decio0 st7w2 r*bhedes 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 object for both trials.