97.01: A force F directed at an angle of θ above the horizontal is used to puk4wx z b; oin*ua06bi3ll a crate a distance D across a levio03bk6;* 4 z wiaxnubel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her 3l1 w:czp89 /gjcu(ewj2sy xrwith horizontal speed v. While bringing the ball to r:w2xy8r/gj1wl j(cc ezp9 3usest, 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 wallboard 3qfw .lls1e*k8;i5 wez meter above the floor for 4 seconds. sfl 1ek8l.wei* zq5 ;w During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration o4erithd9 (n(,xvp oe,n a horizontal surface for 5.00 s. The block’soxn(d49(ipv r,ht e,e 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 uniform ambxojxbhn(,:fk 07h3 cceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J 3 ,mf(:xnoj7 0hxbhkb 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 rig o+ vobm)n/q1,o1 ,ewfctqm1lir/ed9ht is exerted on a 3.0 kg block for 5.0 s. The block was initially atedc+t,mmoqro11bo/l )/e9wi nqf1,v 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 on a 3.0 kg blx 7*3 xnbwva3gml1 au(ock for 5.0 s. The block was initially at rest and slides on a horizb3* n7mva3wxgu (x1 alontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless fsqf-adnbqx+9,a0- ue0ido ;n rozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one di -du +e0 -ia;qa9nso0dfxbq,nrection 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 g-krtbo(j/dj m*ps81 msa u l+nh+c992cxz7 bkinetic energy. An hour after the fan has bepc j(c1rjnzkhgm-2/ux8b+ts oa*s +b9dlm9 7 en 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 a position of 3.0 m, a speed o 9akz 0lxq x tf1/q-hgi3zvp8h2a 1-uof 4.0 m/s, and an acce oh1/pha glk1-az -8qzuxxv39if0t2qleration 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 thery3k 67 oq53thy0cfu o 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 dy f 3uht0o o6r3y5q7cko on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 ho + --edfafr-versepower) of power to a car's driving wheele ev-f+- -afrds. 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 cm npc + *.ma.+dq7oea;)/ni jl (mgkb5.00 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 sp7( o;qdmmkjib ca*p/n c.+ m len.+)gaeed 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 spl xu.xfl9no84(w 7ib seed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the x89 oiswnb fl x(l7u.4incline 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 k8a +9, hqgiovrest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speekg+ ha9iv,8 oqd 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(v,in op7w(ho-fads3 object during the time interval of the acceleratio73w( fv da(ho onips,-n?

  12.08: Through what distance does the obje8me7.m/d smdict move during the time interval of the accel.d/imsmme 7 8deration

  12.19: The magnitude of the linear momentum of as f-b70(orogxf-;zbh e b7cx- 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 c 7o(x;-zb0o7xregb s- h-bcf fhange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while r tes8a764m zj, s/;vxy b9cqkits speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents tv 4cmabr86ysz9k ;7s/ t j,exqhe mass of the crate

  94.38: A force F at an angle θ above the horizontal5wy*e)ft tagcp cqm6p 8*o49b is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity.ot g6bp49tc*meyaqw85 fp*)c 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 us7mpuevxo .k+1ps* 7w ) vmo+ h;gaay1reful power output of 0.10 w to raise a block vertically at a constant spe+s11 7v mkxoegh*vy o7p;arm u.p+w)aed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from resz 2h s:u(gzk)yk. c k/iku y;n,k*qfo,t 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 doncguhn 2o).kf ; zkqkkis /,:*,yy(zuke 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 a hard floor adem ./de qp;d1nd released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows tpq ;ddd/e.em 1he 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 :f4rfqu kh1 x*o)qki*fxr 6m3m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of r: 16f)uh fkf qmk3x* rqixo*4the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it st7u65; jsu9qa0hf r dnmops. If the ball travels 15 meters, what was the average net force applied while it wafsm a9q j; ud0u6r7nh5s coming to a stop?

  02.26: Consider two laboratory carts of differja04 lh ln/uthgbz(iao/4f+:ent masses but identical kinetic energies and the three following fligjnhb(u04a+t o//4hzla :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 cln:xa(rw)73qt8w tm y uay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chaqtr8:nw x )m3ytu7a (wnge in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrejkvn*lye pz .thm:yp,jus-5+ i x .59hte 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 moys yxvhjl.,j*npe5zk9 i.:-5 hmut+ption. 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 dropwxz:i(s 1bpx 2w p:02x .8e vhchsqfo(ped 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 oihwf: vbxq(xs c 2 .ew:0pz1x 2p8(shair 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 aheight H above the ground. The ooqla)yqsn 7u/;a 12v objeco)7ly2;q1na qvao u s/t 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 surface?

  96.38: A pendulum bob mass mon a cord length L is p spv xr v: +ngs-)qwhy /ls82uw,-/jqqulled sideways until the cord makes an ang+-qugsjsvl,q /:xsyv p)w/-2h8n r wqle
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 un w tqm5:9jawk7 c(e3pcknown 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 momea 9jteqw:c( 37m5 cpkwntarily 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 the sidewalk, along a v,6 ;qyjp;t lzjt*f2ov tc.t 110-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a pt*vyfjl ;,; jt t6c.qz21vto 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 3 rg orx-i+v8ameter 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 w-rogix a r+v38ork done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from ty*9od0 s/yr*nauf:mc /7) ic jqui6 xvhe 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, hcxs) i j uvyrcnyui/*m/0*q 7 :f9a6doow are the mechanical energies of the two balls changing?

  11.28: A person throws an object of hw2/x e1i2b-mfjf*fz5 gznlm 7pd /n3mass M straight upward with an initial 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 terms of H, to what maximum height does the -hzbj5z7iff*3xl pne/ n /2mfm21wdg 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 u px6/hym*d+p of 20 N/m. The potential energyum hpx d/6*py+ stored in the spring is:

  97.10: A compressed spring ha wm mv:k7pw)*as 16 J of potential energy. What is the maximum speed it can impart to a 2.0-k7*mvpwwkm a :)g object ?

  

  10.31: An object of mass M starts from rest at the bottom f9u revtna 8y;c4awpfmj7 7 (-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 amc7- ejf a9fu4w np;8tvr(y7incline 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.