97.01: A force F directed at an angle of θ abobm48 hjmezepo+93t hr *tpm9je, c-8 bve the horizontal is used to pull a crate a distance D across a level floor.9thjmhejb-bepp 8mroc e+m84*t3z , 9 The work done by the force F is

  97.33: A softball player catches a ball 8 mz u2tsu(k2sof mass 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 e2smzk u8ut s(2xerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter a 13uxrnucch9lr+( 3y mbove the floor for 4 seconds. During thercu( rncm+y 1 l3u9h3xse 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horifwajlk,;wvale*a+cgscu z : zr;/:6 +zontal sur ca;ufecl a/wks+ z w::g;j+6*lar,vzface for 5.00 s. The block’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 block slides with uniform acceleration on a horizontal su,vx-u, v-i l :d*dc qbtt;8ojnrface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in cv xud*bjqtdt8l ,--i,o ;n:vthis 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 kg ;feit+i9 4 9gz*fkxfor 5.0 s. The block was initially at rest and sli9* xf ;4 kkefi9t+ggzides 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 bm.eb+,ij qz** /lsdkzlock for 5.0 s. The block was initially at rest and slzi +bj, k.e/qd*z*mslides 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 fricf0-q 4evvg:a ationless frozen pond throws a 1 kg hammer in one direction. After the throw,av-4q gaef:0v the hammer moves off in 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 the fanzf.irkiduv 57j6f zz//0vb wx fwk21488 jcpw has been 5vuwd1 b08ifk krji 487z/ wcv/zp6wzf .2fjx turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, 06eeu tob:(8gvow k9ta block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accov0uk6w og:eb9et 8 t(eleration 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 bookroom 1.3 m from *g t,h .jvf ep.a0z,hdthe floor. If the j d,vfa ,.p.zt *e0gjhhanitor 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) of powerh5/i vrq5rt( hd egv++ to a car's driving wheels. If the car mainta5d5rh/(he+ gv q+r itvins 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 spezbl j:+ge qr6c166 euied 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 lr u6b6zgj6 i e1:qe+cit 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/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:ucb-0b u+pg u 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 of F = 240N.ucupg- b0:+ bu 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 rest,25dxbrh cy*u+p-osfwz . fi(y (3; nga along a straight road. CarA has twice the acceleration of Caruzs(bf3-yh( d5*n p .a w+iy;gcxo2fr 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 ahv fhx-e bre- k)79o6ycting on the object during the time interval of the acceleration?6r) fhx ok-e9 vy-beh7

  12.08: Through what :b63)+c3gbt opxy tux6z+ 9)oc uoqohdistance does the object move during the time interval of the accelert xt+y6ugcz)bpbc )xou9ooh3 :q6+ 3oation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fgaidi8,ed 5 h8c1-onfrom 6.00kg.m/s to 14.0kg.m/s in aac8n,8 1iigh- oe f5dd time interval of 6.00 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 enery:h0/9or x ax,t5swc jb9(qu;y ;tosegy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choic w5r;h sts,(xex9y;uoj:b coay/0q 9tes best represents the mass of the crate

  94.38: A force F at an angle θ above nn.kj)bh-m/ )kvm (w aub ,y7athe horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity.-bk mv .,a b y7h(nkjua/nmw)) 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 u,s5w0 ovpu: tp+z mn,cpward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane :, wnzvcptp0o, us5m +raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rlu o7 /)t)(dscylcvi0est 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 during the fa c )ulic(o/dvyst)70 lll?

  96.18: A rubber ball is held motionless a height ho above a hard floor 1zua8 7z4r4 fmtn gb y4+(cqykand 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 thf8cnakz444 ztb+y7(ru my1 gq e ball and its height h above the surface?

  07.06: A 500-kg car is moving1r n1zt7d :dtz at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net tz1nrzd 7 1t:dforce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows ddik z 9,*m;h+, gwhilbown uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was ch,gk+zhb w ,dlm9;ii *oming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic e.t - xy**aumhwnergies and the three f m*. xywa*-thuollowing 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 in the air with an initinkr jp,1(eie )al speed of 4.60 m/s. Ignoring air resi, rki1 )p(eejnstance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigpy g5gs.h f-3dht upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center ofhpy 3. gfg5d-s mass rises a distance d to the highest point of the motion. 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 ob9z7p qm8cb vk gf28w7rmod8/gject 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 consp8m7 q o gf7w2d9k8g/8b mvczrtant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass Mu xn :1m9+y0xcb4emd w1vku* n 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 t1n knd+*x4c1ebuvu wy:x 0m m9he 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 sidewayslf5wil/cmcl;w i 8way+5 /p;s until the cord makiw a;fyl+85cwc5 plw;ilm/ / ses 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 ofa4oe4 8 liul(n79o otf unknown 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 down the hill. What is the sled's speed when it returns to its original position at the botto84utn7af4 o9(el li oom of the hill?

  06.09: A deliveryman moves 10 cartons flnm1 *nbejrve18 0x d/o ;uv9tu6pba2 rom the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above th2 bbv60uxdmvn1a9po8e1 n ej lru;t/* e 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) btjqgd y;81 d-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 following choices best represents the work done by the force F on btdqj8g1;dy-the box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fromf;:oju n+/bg b the top of abo;g/ jn:b +fu 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 changing?

  11.28: A person throws an object of mass M straight upwar-j 2 vn9px 6r71x4tmy;kxdty 8zeaa ,fra-v s5d with an initial non-zero speed v. Thed -m1 r8aa2jy kvt tsp7,fxzx;49xeyr6a vn5- 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 spring that has a84pz hkclo;u+ spring constant of 20 N/m. The potential energy stor;k84z uc pl+ohed in the spring is:

  97.10: A compressed spring has gw8dzb6 ns:2s 16 J of potential energy. What is the maximum speed it can impart to d 8gswzns:b26 a 2.0-kg object ?

  

  10.31: An object of mass M starts -lbbp10a2xv8fcvn/jv :rapq1baa+,(c y,xe from rest at the bottom of a fixed incline of hei(lx p /28av,1n -1bf,ayv vcbjxr0cae qbp+: aght 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 for both trials.