97.01: A force F directed at an angle of θ above the horizontal i0is i6saidy op8o ( bkpzv77+3s used to pull a crate a distance D across a levei8vip +z637d pasyb0soo7(kil floor. The work done by the force F is

  97.33: A softball player catches a ball of 7 (pnzc)pbv7 qmass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her 7bp7pvn()cqz hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallbsm;e;7v r ujx 95:o+-pcqjp rboard 3 meter above the floor for 4 pcrr; q;uo5bse +j7v:x9-pmjseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slideke3eqfa)ai5u/ 7p -u es with uniform acceleration on a horizontal surface for 5.00 s. The blocuie/a f)eqpek35 7u-ak’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 ; tfr(bed/7 ycblock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.yt /d7bf(ce r;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 directfw/q yul 9r0;zed to the right is exerted on a 3.0 kg block for 5.0 s. The block was in wq9rlzuyf; /0itially 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 dii5y dgj*s(l7 x+;c,4nkzgehyy n7+tlrected to the right is exerted on a 3.0 kg block forl*ckjzx 5i g;ty(n7 yh7d,n 4eg+s +ly 5.0 s. 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 initially at reston a frictionless frozen poy ei*c 6njb3o-nd throws a 1 kg hammer in one direction. After the throw, the hammer moves off injoye b*inc3 6- 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. An hour after t p) dzqcdlooc)gyw5r; td2-;u jv9 *sa) *1jpdhe fan has been turd- )*v)* dlu a)ccgp;sz rwopd;d1jtqj9 y 2o5ned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has5gzd73. jjd zvbus(4p a position of 3.0 m, a speed of 4.0 m/s, and an acceleration of(5uz bpzs3d j g7d.4vj $1.0\; m/s^{2}$ . 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 1.3 m from6g6 ow2nem yl ;acd-l3 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 has a mass of 103-yw2c le ; ma66dnlgo.0 kg.

  02.32: An automobile engine deligp3x7-kxo b b8vers 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 of the retarding force acting on the c b xxob8gp-37kar?

  09.13: In the figure to the right, a box moves with spfwz),rf;nr7 v4dy1i veed 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 f r wni7 vdf4r;,1v)zyof 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 c)(rhch94veo.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 forc c4r 9(hhoce)ve 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 l cbj xzfxg..+ wt(;8yto the right, each starting 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(f jlx;by8. gtzx +.wc 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 int8lddzmdthod;7 4md4m 3h/; mx erval of the acz;mdxm3o 84m7/hdd;h m 4ltd dceleration?

  12.08: Through what distance does the objj7w gz5jq 60 (v+mya.a9ngdv,wobgq /ect move during the time interval of the aco09z 5w,d.(a jjm+6ngaw vg/b qygqv7celeration

  12.19: The magnitude of the linptu.er6zp3b+ ht n.-wear 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 d . pb-.whue6tnz tp3+ruring this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whila2wg+av 8yw zb2f 6jo*:e 3mjde its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices b f2: oj+w d2aemz8 yja*g3wvb6est represents the mass of the crate

  94.38: A force F at an angle θ;vknwxg..n.k : zs i)n above the horizontal is used to pull a heavy suitcase of weight msx i.n:z.;wn k. )vkngga distance d along 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 upward force and delivers a usev5bxf kl+a,d *ful power output of 0.10 w to raise a block vertically at a constant speed. At what constant spel 5x,k+*d bvfaed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of te.k qd.z; .sqghe 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, whichk..ezq.;dgsq 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 during the fall?

  96.18: A rubber ball is held motionless a height ho above an:jxt i3q8k ;dcc.ws* hard floor and released. Assuming that the collision with the floor is el3:qdjiw ck;st.*x cn8 astic, 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 ser6qc. (trs (zzab.s:gg t ;p3ies a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force nec(..gbgt3 i ps (z 6qca:rsrtz;essary to stop?

  00.26: A 500-gram ball moving at g 1(62+xcso n/bljimxw:ry*m 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 comrmgbi yn2j* :sl oc xw1+(xm6/ing to a stop?

  02.26: Consider two laborat3p o(uoki.8xx(1udbv ory carts of different masses but identical kinetic energies and the three following statements. Which of the 3pixk8bo do ( uu(xv.1above 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 gk :g( yx1k) yiawu0o/clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in itu:/0 kyxog1ai(k) ywgs potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upw.ajy0a,mb8,po.b zqk ard from 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 motion8,,ybjzqpboakm .0 .a. 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 gr *5hymy5g/kn-ue0isu-vz6v h6lu+a round. 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+ -0mv-*ul5g5si6aevhy zr y/ nk6uu h ground on the object while coming to rest?

  12.48: An object of masry (sv;0das1 ;wm7kkk; 5x)ehgz m:lpp m(x/vs M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting timeek0(pg:l1vh)(;pdrkwmy s a7mk/ m x ;vsz;x5 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 g- b9qzkeipb,.i-gl p7pxu0 d.)up+xcord length L is pulled sideways until the cord makes anp. up, ix dp7bqp9kgzi-x.e 0b)l-+gu 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 sle no 0ewjmc;36hd, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above itw;oh0j6mec3 ns 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 the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10 oljdpy-+/c, y1 r)dgmb lz0s;l/;rr a-meter ramp to a loading dock, which is 1.5 meters above js,ra/ c-byly/ z0prd; 1g orml);+ dlthe 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 fofw*5c pgi7+zko dj 2p/r the 6.0 meter motion of the box upward along the incline. The mass of the block is w*2 j/i5 fp+cpgoz7kdM=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 andde ru(d+bivkd j8;z56 B are each dropped from rest from the top of a tall tower. Ball A is drvrd(k;5b 6zd+ i8ejduopped 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 throws an object of mass M straight upward withj h2gxr13m z7hbw35pqv, s7vs 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 wqxs jhv7vb g,7zs2wprh 31m35ith 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 fb b 81obu(j47zpoa:+eh,en e iv/ s1bthat has a spring constant of 20 N/m. The potential energy stored i(1h8e1b:uo,nbap 7+ej4szofebv/b i n the spring is:

  97.10: A compressed spring has 16 J of potenz2fzh)6ip 9dot b4a f5tial energy. What is the maximum speed it can impart to a 2.0-kg obje9f6 ta z)5fp2i zodhb4ct ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed i8(nnj xqi0p2a ncline 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 object f2q8ijn0xpa ( nor both trials.