97.01: A force F directed a() 0.a9 hbsj4rxc vhlbt an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by tbx)h (9hcv a0s4jrb .lhe force F is

  97.33: A softball playerew.6sw po3x.sd8z( * w/t ajaw catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to re*s/(p 8sa jxww3det.z. ow6awst, 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 3 mete p6s;ci;ifa1k po5 2txr above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard2ipp5o ci1 afxk6t;s;?

  17.11: A 5.00 kg block slides with i,t,*zfsicmfi 1h6 a. uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases i6i1m.s,, *ifa ztchf 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 )3oblf/0mn qh uf r k9q;wx3+gwith uniform acceleration on a horizontal surface for 5.00 s. The bloohff 3/ru qx )n0gq9; wl+3mkbck’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 forck 0h/rzc2ov 7l2j4hgz4q) pjv e directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially atkhr0jh 27l z4zov2v)c 4j qgp/ 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 thett,p11dw4y5nc/rt /l cvopox 8hi 3 l6 right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizon,lp1 8t pxc31incd5o/yvh4wotlr / t6 tal 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 pond throws94 /eoj((8p0lysvhq odd d/cm 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 d/d0sjclv( hoeqmo / 4p(9dy8following correctly describes the above situation?

  03.14: A fan blows the air and dkh of3( qkej4i86 uh7zi-5wugives it kinetic energy. An hour after the fan has been turned offkd5hku6j (iu fhw87qz4eoi-3 ,
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 kvbo +;)j8 n.5hmpay ;p 5wbvkh7v 7njof 3.0 m, a speed of 4.0hb jv5)hnk;vo.anymp775kp j wvb+ 8; m/s, and 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 book dd(9+ax5e+ ted v2n3es2ixetz :hzp, room 1.3 m from the floor. If the janitor relocates the box to the shelfp(9vdnzd+z2e +t2xe 3d e5h:x, etsai 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) of pvj0dq fqxugura*/136 ower to a car's driving wheels. If the car maintains a constant speed arqq* udfg3106xj/ vu 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, a9nw jpy:t :6zavda5fb.9n b. j 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 2.50ay9.n9:vwa bjp .:btdj65 nfz 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 righ28jx32 k ovfi1zt3fqut, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The1o2xjz uki q3 t3f82fv 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 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:rgkyr duchh v:a8 :9/ rest, along a straight road. CarA has twice tahc ::k/h 89dgruv:yr he 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 net force acting on the object during thepyh - 6-d80 -qnaezlzi zqk:8e time interval of thzhkdy nzz - pe68 q-0qle-i8a:e acceleration?

  12.08: Through what distandrs pzz6y:)e8: ;pb tjce does the object move during the time interval of thetp;8zs pzrj):bd6y :e acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed f/ghp 4*xz en y;,zy-o 1xs 6a)keoyax1rom 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change h 1a;xa*yz)e eyxo p-kyon1z 4 s6x,/gin the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J i5xkl f47;ccf of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass oi5k fcfx;7l4 cf the crate

  94.38: A force F at an angle θ above the horizontal is use sv4 e7 6;h+ijiefp0lwd to pull a heavy suitca0pw eilfiv h76;4sje +se of weight mga 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 forceh71 qpc8)vvq 2ponm 7z and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what cons28nv7q1o)h7q vpc zp mtant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasenaybju, 5jnqtc h8)+xg mg)( 9d from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg obgyxn mjaq8tb)5)ucj,gnh 9+ ( ject 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 during the fall?

  96.18: A rubber ball is held motionless a heighi7t 6ark ,j 9zbke4ax:udd p-;t ho above a hard floor and released. Assuming that the 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 abo r7 6iej-tapkzb kxa,9ddu:;4ve the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ayqr(a+ n ;c4q1 /uwcaohead. If the car t+/yc; c4raaow1q n(qu akes 95 meters to 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 downl6w s w mbm*ntm)krupjw 3vm:w;1 -5x2 uniformly until it stops. If the ball tra; 23wxl) wmbms-vpj:t1nkm*5w 6wmru vels 15 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 identical kinetic ej esoj *vr,oi h;zd76(nergihd v,z7; ji6o( ojrse*es 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 vertically i2meb+.q2f tg6ruhmf7 n the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reach.mtb7f62+f egrmq h 2ues its highest point?

  06.20: A boy jumps from rest strai4xk8 r(jf apo.ght upward 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 motion. How much physicx4ka .ofjr 8p(al 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 obje;/2(0 )nysh+d6j,o lysb o z/qpqkgyact 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 magnitu) s j pod/2gqan(;y+0,s /6 lybykoqzhde 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 ahe)ykivo8)kat5ec 9 fvfo3 v n68ight H above the ground. The object bounces off of a horizontal surface in a co9yv3v f8t)8oaifke)5 6n kv 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 sideway8urk/ ut x4 0+kt jq(mnwj-0bos until the cord mn8t+rto( /4muj-wbj0 kk qxu0akes 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 unknowli +dnx7l4l yfv2m 11in 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 momentarily comes to rest. The sled then slides back d7dlix12n ylim 4lf1 v+own 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 .3gp;b e b4ee xis:* :kwzl.l9cbu;oha uu1z:10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cart:1 icpzsk*x:lebezou . hb4u. g;:a wlb;9e3uons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figureqn eg. 4stop-f f6e:un2wq 29l) is applied for 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 followinggt9 qn 2f4e q-2psl.eow6u:nf choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B (so87jld) fr+zwp f+k 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 ball A strikes the ground, how are the mechanical energies of the two balls changingo f zp8ljrd(k7+sw+)f?

  11.28: A person throws an object otxbb02ycdiud- + )8+xi yy7xof mass 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 term7xy i y+o0ux icbt-8yd)2b+xds 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 sprcs;2vpp b6 hz(ing that has a spring constant of 20 N/m. T;p6(p2b vhsc zhe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential ene5q * x6 v-z6ba7dzrkknrgy. What is the maximum speed it can impar z-k7dkv x 5qn6azb6*rt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline o47vl f9f;y lgieq6sj- f 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 co9-se6v g 4fylqlji f;7efficient of kinetic friction between the incline and the object for both trials.