97.01: A force F directed at an angle of θ abo dwbnxjeyr79l86i tfhk 26**rve the horizontal is used to pull 2*itj7rf y8 ebrk6d*whn6xl9 a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is mga7 )3 lxm iy5qp)m4ytoving toward her with horizontal speed v. While bp4xa )73 lmigqytmy5 )ringing the ball to 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 kilx nf0/tp2m)ab2qz anncw61+le5-omo c/:nhb ogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power wq b1m5-+ao 6e/oc0:fzannpcm)b l h/2n n2 xwtas expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on ayua ji*3a4 -cv horizontal surface for j34 c-ia*vuya5.00 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 accelerat/qi ylm ;* vdbf24+mcxion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this ticmm+;i4 fl *2/qdbvy xme.
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 vgs z+8g0 ,o/dl.xr qrright is exerted on a 3.0 kg block for 5 d/o+vs q80lr,.rzgg x.0 s. The block was initially 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 directed to the right is exerte82ijyko;uxk cm sk7 d0:gjn3 5d on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface mx k8csj ijynkd2:u 3;k70g5o.
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 throws a 1 kg haboil6 7 )ixz,x-:qy)qqr4 nlsmmer 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 following correctly desc zq -r:x7yiln,o6sl xqb )4)iqribes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. A3 rukf o 5pa-89whq kb(d-*dcan hour after the fan has been aqa(* k upr9h bw -fo-53ckd8dturned 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 zubb0 yik:55bl:en t*of 4.0 m/s, and an acceler5 iz*u:n :ebb0lbkt 5yation of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old tex8wo)i1, t ukajwtvnr3( c1g;g: zigy2mf z3i3tbooks is on the middle shelf in the 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 do on the boxc8w3z1 aok 2 ju 3g)zfriwy;it :v(imt1, n3gg. The box has a mass of 10.0 kg.

  02.32: An automobile :;v hhh9ed (pvengine delivers 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 rdh;p:v ve(9hhetarding force acting on the car?

  09.13: In the figure to the right, a box moves wi dl8qj0wj;. uba/x 2rhth speed 5.00 m/s at the bottom of a rough, fixed incl. r q8uxlhaj2jw d/0;bined 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/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 thepk94ne8eb1y ebr*pa:;: v eyy 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 kbee ae*e;p49:y8:yn1yp brvto 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 restbh3e 3msz77uq; 1a. pi2hjdi o, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has 23 ejo.;udz q 37aphibsi17hmspeed 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 actinsgr9t0- 0x mnig on the object during the time interval of the acceleratiot six 0r-gm0n9n?

  12.08: Through what distance does the1/et 40d)n iza2n6 wggg4pqkq object move during the time interval of the accelerationkqn6ag 0p1)i 2eggwn d4/qtz4

  12.19: The magnitude of the l.*/-kjqi-iesrh0f -xnzw z r0inear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0qen z-0rj r/xk* .h-siiw fz-0kg.m/s in a 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 energy while its speed i 3o:gwvwz wynka3 / *hfp,-3ris increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents tyw*w fi3w3rok-3p,zh/ v gna:he mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to p nkl.rji sh09;ull a heavy suitcase of weight mga distance d alongh si;r .lk0j9n 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 angjl fy3s n4w35d delivers a useful power output of 0.10 w to raise a block vertically at a conjs53f3 4ny lgwstant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released u ;q5fl*jr x.ozi67h lfrom 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 1.0oiu 576j*.xhrlql; fz0 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 mcg.mr6 srz0re;68rim otionless a height 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 ec0i 6mmrrsr e 8.z6r;gnergy E of the ball and its height h above the surface?

  07.06: A 500-kg car is movingh(.z h4 xt(nuy at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to .xh4hz(ntu (yrest, 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 down uniformly until it t1:x. j;cl iq -bjrg2n 4bj3blstops. If the babjqbi 4-t. ;2gl3jl: 1bnc jxrll travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differf i7d0 offng 0apu9ca/t3dp2f1al10 r ent masses but identical kinetic energies and the f0l pd/c137a 02 foaitnffr9p au0g1dthree 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 in the air with an initicj 6;5w sa clttov+419ir daw:al speed of 4.60 m/s. Ignoring air resistance, what is the chango ivcs waj d;w9416ta +5cr:tle in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationarymuy1c(hx +0gq92dh wx concrete surface. The boy, of mass M, leaves the concr9 yx(cm0+2wuqgx 1 dhhete surface with speed v and his center of 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 ahs33 htvk(i8) 6xj yxkveightH 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 air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on th8v j (kx) hi6xtvk3sy3e object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the groun5 d6w3x. 195 xiqlotgczrlq)nd. 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 the aq 6lcd5 xq5z3nt1)xl .rwoi g9verage net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L ij)kpv9r2a 3k9rvu z+zs pulled sideways until the cordk k rv)9+32uajrzp 9vz makes 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 unknown angle. Tzjh8zmo y7bfp0z/u9 )he sled, which started at the mu9zz z8y)of /b0ph7jbottom 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 the hill?

  06.09: A deliveryman moves xz c5u*2w;cvu 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, wha*ucu5; xczvw2 t 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 figurxr0d r ,n;e7+x nb-w1qqug,ohe) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is Mqx-unho xeq d ;rg+7n,,rwb01=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 and B are each dropped sjz- i ywnc; o4ns9hwrp ml();x 3:oi7from 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 mechan;9 cilswn(r;js3p7zoh-wm: iy)n xo4ical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initbr+nx9 3bqdd5fz34fjial non-zero speed v. The object rises to a5xq zfb+f 39 b3rnjd4d 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 1ls)pseof1-w yb:w s 9a spring that has a spring constant of 20 N/m. Thel -bf1o1essyw):p9w s potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Whatwm +9syd* hp/:ln(nepxjdtw,.imu/1 is the maximum speed it can impart d/ nmw9p mihp+ we:lsx,j .y/n(1d*tuto a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclinadkwf6 y4c.obzc8 b +n6 ;b6qse of height H. A person decides to push the object up the incline in one of two ways with an applied force shown isqz.+ko 8cn4yd b6;a 6 6bbfwcn 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.