97.01: A force F directed at an angle of θ above the horizontal is useh8ei 7 ,8ty4mi/vf udid to pull a crate a distance D across a level floor. The work done by v 4i7yf d 8ihmiteu/,8the force F is

  97.33: A softball player catches a ball of mass m, which i:l h;, pwj+e0bispns7 s moving toward her with horizontal speed v. While bringing the ball to: bsp,+jwhn 7 i0el;ps 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 wallboa72hb+bn,g5h1wf 4ah fj q+ xbard 3 meter above the floor for 4 seconds. Duringxn2fbqh45a h b +b1j 7hfgaw,+ these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg bl upw80bj7bn/bock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy 7bj 8pbn/0wb ustrictly 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 wik; zio1lw- x 91xyz7nnly7fl9th uniform acceleration on a horizontal surface for 5-n k77yz91llo9 ;xnflz y1iwx.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 block fox nse9,yg:ikyq/q /e4mp,4xs idt( : zr 5.0 s. The block was initially at res,y :z:ns/(i xpee,qt4xmd qsyikg/9 4t 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 a. qbsxe oac 9ay x4o)xw0g/7*the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on )xq4ae 0 c.oagxxwo79*/ bsya a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reszp i;bgt.tp5j4h32y yton 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. Which of the follo.ypjh25by zi3;ptgt 4wing correctly describes the above situation?

  03.14: A fan blows the a az636 -ur:27 txzroqahn8ttoir and gives it kinetic energy. An hour after the fan has been turned ofr3r tzz oa:-aqo8t6x76hut n2f,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a +9wr e1.yid1zkwqt (fposition of 3.0 m, a speed of 4.0 m/s, and an accelerati+t.9 yw k1idwr (fz1qeon 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 sh.qx7weq6jb f+ 0qu f5velf in the bookroom 1.3 m from the floor. If the w5 qfvj6u7 q0eqb.+ xfjanitor 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 has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) ke4s y9;,vo bjof power to a ca4bv jeos;9y, kr'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(/w+ g zytmd xki)0.ru the 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/swm.) k x /(g+wiyzdtr0uhen 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 bda4m asn7yx .:ottom 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 ofan:s4 yxma.d7 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, aloxj xt,jba,7/m7 yip4vng a straight road. CarA has twice the acceleration of Car B. Afta7x4m,/ptiy7 vx,jb j er 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 net force acting on the object during the time interval htrfi (q2 uw:v8fa m cq8f3q91a; -9gt l+bledof t21cl(9uq;v9g8: hrb-fwaf 8tat 3m dfeqq+li he acceleration?

  12.08: Through what distance77(qy;kf( utrli r 2,. ycvhdlsk6(j k does the object move during the time interval of the ac2 f.k(khlyr 6v,r( suqc i7lyd;ktj7( celeration

  12.19: The magnitude of the linear m1 v+a5uno hz:jomentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00n+h o5u:avz1j 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 whilextq rtitwwnzb( ,;k17 rm2( 3d its speed is increased from 2.00m/s to 4.00m/s. Which one x1w t(z ;rkbrt(qdi3t72,mnw of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal -8igw 2ozl(yt is used to pull a heavy suitcase of weight mga distance d alongoz ywi-g28l (t a level floor at 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 upwbayn 7i7f5(y-mba4 rfard force and delivers a useful power output of 0.10 w to raise a block vertically at 7rbfy5(m-ab7 a fi4n ya constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releaqes 3hg 3osso6(tjy -:sed 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 object ( s3s stq gjh6o-3ey:oduring the fall?

  96.18: A rubber ball is held motionless a height ho above:5q ziww:f c2enp pk:1 a hard floor and released. Assuming that the 1c2: zn iww5q:pkf:epcollision 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. T52 b9 *b4*b;r 78egdxgnkehcwvi 4qgahe driver sees a barrier ahead. If the car takes 95 meters tbn wxig e b7vdbga;c48 *eg*h q25k9r4o 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 i507 mzz +qw k 8t7vfb0pmmqm:down uniformly until it stops. If the ball travels 15:8 zw7fm75q m mvkipqm zt00b+ meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identicalk7i*bl x *u 5(psohe+77un0b knw1gw v kinetic energies and the thre e* b khb+su u0lixvkp*nn 57gww1(7o7e 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 verticallyt hb5d0 +5ilij /xax4l in the air with an initial speed of 4.60 id4lxjt0l+ ab5x/ih 5m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationa7c 60 t0zocyff4.fjxhb/o5 /bw2jjjo ry 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 moj0ofy7.6fo42hjjz ct/c5o bxbfj/0wtion. 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 above the ground. The objrf2rwdpo uqhdma1 :;7 yp.0 w4ect 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 g:wmw ahdo;f r0y4p1q d r2pu.7round on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. Toy (kglr ,; sg:by1bv9u :y6cdhe object bounces off of sg 6k:,brygbu y1dcy (9v;lo :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 pulled sideways unczxwy lh+io* :3 nzt5/ y(3dtotil the cord makes an *t+y(o5znlhdz 3 tc3 :/oxwyi 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 sl1s2oa+fp f ze6w *(u9sd;vib ned, 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 position at the bottom of thea*(6 nufeo9 i;d+ sbfs1zvpw 2 hill?

  06.09: A deliveryman moves 10 cartons from the side7(ysk7su tfh) walk, along a 10-meter ramp to a loading dock, which is 1.5 meters abo )7fsuyks(th7ve 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 shown in the figure) is applied for the 6.0 m jib8ap8a 6qal2gip s1zt1(r+ eter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the follrbzp j2q8 ta+ 8p(al16giia1sowing choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls Aki ; :na/no1by 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 ball1ko:ba/;n iyn A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with *q4;jwlq.t-tip aden z06 f, 4jk:kdean initial non-zero speed v. The object rises to a maximum heighj;kfz:*.lat dw0qnj44eq pk 6t-i,det 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 qsj,:(3q)e rpq)kvxb N stretches a spring that has a spring constant of 20 N/m. The potentiajbe(s)vq:3xp , k )qqrl energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximumrd/ 7.q ,jqdxa speed it can impart to d /j,.aqqdxr7a 2.0-kg object ?

  

  10.31: An object of mass M u dk t0g1wakiqd6 -u bd,:j;,dstarts from rest at the bottom of a fixed incline of height H. A person deq 0,, ijkdbu6addud: -kgwt 1;cides 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.