97.01: A force F directed at an angle of θ above the hodna5av-j 0yt yn3af;jr ;*5wjrizontal is used to pull a crate a distance D across a let;n ra;5v3j w 0yaa5* fyjdnj-vel floor. The work done by the force F is

  97.33: A softball pl ckoz (ds gjdm 61hz2v:g4e.+kayer catches 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. vc2+d4 zek1:mgdo g6.sjzk(hAssuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a kxse3 /2r9z:e4hx c5 ur7m sqa20 kilogram sheet of wallboard 3 meter above the floor for 4 su a2r9eq3xxc:szh5ek r/47mseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontachh+ih . m)av7l surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.v+.aih hcmh7 )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 uniform acceleratid,54mq r uf3fuon on a horizontal surface for 3 mqr5uf,duf45.00 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 bd23 n3z cl.pyulock for 5.0 s. The block was initially at rest and slides on a horizontal surface. z.3ycudn 2l3p
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force q w2pz0luoz -c-hp6y3 directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was inz 6u l0 2-qy3hzop-pwcitially 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 )mw/53efmd tqat 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 other direction. fedm )/ qt3m5wWhich of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. Ay)rpi7 +o0kvc*kei- fn hour after the fan has been tv oi)ey*k7 k- 0r+picfurned 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 3.0 m, a speed8h3o p;.e i eipqti.*kjnx4f( of 4.0 m/s, and an ac8;onpi.i jxk qhe*i3(4 .ptfeceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbjx ndsz00;r,0jsu ic, t*np-ua o:fq6 ya4 8ovooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to thea-y a n 0zo vu8*cn,srs0x6fpodq4itu :,0;jj 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 .d1)fejvi e0hug74 jiwatts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a cong4 .i u1e 7jh)vdfei0jstant 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 thj hi n8k-a+uf00d:i iye 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 infh8+ dyk00:aiuj i-i s 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 bk-j. mp96 i 9.xponc+t.e s6v4bmxmg 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 incli+xb4icm.g99e -p. 6 6ok jnpmvxb sm.tne 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, eact6mi 0y-t oski;x-ymti 2h) 8nh starting from rest, along a straight road. CarA has twis xh2)m my8-6k it0iittn -;yoce 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?

  12.07: What is the ipm5e2xgcs,j +6i/a*3xka; hioxo g7net force acting on the object during the time interval of the accelerak+gi7 5haxjis/6ce,o2xp;io g 3ma *xtion?

  12.08: Through what distance does the object move during thf(cl/x)ag1.t- vh+ip8 .cqciqiao * ge time interval of the ai8 fvp cti1 h q).al(g*ai/.cocqx +-gcceleration

  12.19: The magnitude of the linear mome qm.naeqxa.2+ po4 ye jx cwb;h-mh*2,ntum 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 cha2.m.q4caae,j bn2x m* hx p;y-owq +henge 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 increased froyl/msgg/.s j 6:/ j m50wzkqlbm 2.00m/s to 4.00m/s. Which one of the following choices best represents the mmgll/ jmq/w6yjs5 0z sb.k:/gass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a8 csx li 2nm*m. *idrnkgw6qv27 ,h0er heavy suitcase of weight mga distance d along a level floor at constant velocity. The cr hne7lc.2m gi,6rvm*kdq swx i*02n8oefficient 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 usehn6j5kn:b e 1eful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.2hk:bj1nen56e 0 kg block?

  12.18: A 1.00 kg object9a17a c b1gdhk is 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 choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg ok h79gbc1a d1abject during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and r* dfuxz.j)*u meleased. Assuming that th.dx**muzj)f ue 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 the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a: u8biylztga+ffdu)*swj :. d 4 ,bifst y35*n barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude ofwtz*buty n:usfiddj4f 85*ib,sal f:+y 3g). the minimum average net force necessary to stop?

  00.26: A 500-gram ball movtml vj rww;a g0hgvi5o. *13x)ing at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comingwh0mggt5) 1ix ovv;aj3* wr l. to a stop?

  02.26: Consider two laboratory carts ofou2 9*aw8bpm s gm/)do different masses but identical kinetic esp9 o 28owbmdgua m/*)nergies 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 tossed vertg7- n+ie gna9sically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is t+a97sg-n engihe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from 9 dg;hab auw() hs qpw65j17nia 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 avepw)sjw6 ad9h5hq; g7ia(bn1urage 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 ahe5,q 0;wqfhwmr svx 2zylg:f2rev/5zy d),h) pightH 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 groun)xhy0yl;wmzp5/f5s zh2d )vfrr,:2 v ,e wqqgd on the object while coming to rest?

  12.48: An object of massv7yi*g gl2 y,(m pfa2ivk+ etqppk ,)+ M is dropped 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 of the averagip,ep pl,k ggy*2 )+vm +itq7y(k2afve 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 sidoc c2w+6en3s 9qy nbt-eways until the cord maktn32qe9y 6c-co +wnbs es 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. T9fzowa j0)zbkaze vv 5 m hbd07iv7-:y*3ts3 yhe 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 origin maks0*otz 5zvz:y9b7yi 33veh w 7-0vf jb)adal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alonljzi qsp8hv a-4bfsnk; n8f/u (7rm)/ g a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If ei - 88 mj/;f a(v)4prhnskfnusl q7/zbach 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 applied for the 6.0 t3(m hqes d2m: u1bbv,se9ix6meter motion of the box upward along the incline. The mass of the block 6i d x sqs,92eeb3b1ut:(mvhmis 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 dropped from rest fromgs;qz3 biek*g/a9k8 c the top of a tall tower. Ball A is droppedke9 b8/q ;ag3sgz cik* 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 throet-za+o* rur;qxz;e(+ uzw 7nws an object of mass M straight upward with an initial non-zero speed v. au; rwt-nezu *rxo;+z eqz7 (+ 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 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 sprinhjyn)yg (m i58g that has a spring constant of 20 N/m. Theyh y8gi5) (mjn potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is thtlbf 0gz5nq .qyld: ).e maximum speed it can impart to a 2.0-.l lydf.):q tn5bq0gzkg object ?

  

  10.31: An object of mass M starts from rest at tm6tbxn f +tg(fn- m.0the bottom of a fixed incline of height H. A person decides to push the object u6nmtf m.gtb( -+xftn0p 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.