97.01: A force F directed at an angle of θ above the horizontal is used to pu88ynsg jjzq+97 j 5levlljy8zgjq98l7n5 +jsv e 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 jom;fhnc zg4*g 5fvuib:)v:/ m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceozb*4:5; g fnvgui c fv/:)mjhleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of walp 6 fxuwz2zmq:7tbxb.(*gc* jlboard 3 meter above the floor for 4 seconds. D 2 w6z(mzp7cg*jt xbb*.:uqxfuring these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontazy7e -/;y7+)y/ uzceez xxds raq z,8hl surface for 5.00 s. The block’s kinetic energy strictly decr ,/z)ezyyd7zcu;h+qra/ xz78 ees- xyeases 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 ony680n,2wtunk m -3 srrdfaro ; a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrm0ky,o;nf 6uar-s rwtrdn832 eases 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 stw2 bc6lrg1c)fmq.0.0 kg block for 5.0 s. The block was 2qwblmct6 c)s1frg.0 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 exerted olnkqo))m 1gyg/w0 f u 62ovzp,n a 3.0 kg block for 5.0 s. The block was initially at rest and slid2kwq6f o0g p/z ,)o)gv1nlmyues on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initialp i2ak ljmfkl.cx4i+ne-5-upbb(. r +ly at reston 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 k4bl.. m+ -p npliue5b kjfra+(xic2-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 + gytp7pfutw 3q o;n(,after the fan has bey,o qgtfup ;p+(7wt3n en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of glw: (c yxp5/.k,dy-j r2gf /hu 8ypvxmass 0.50 kg has a position of 3.0 m, a speed of-8jux yfdghlw/vy xc ,2y/(pgp :.5rk 4.0 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 bookroo y88*vl5, t xq ydehaxbm1)m)vzdw918r y,km cm 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 box. The box has a mam8q8dl) yy ky,181xxmbet59 mc *,dv)zraw hvss of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower)2 -q rleslvm(0 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 qrlevm-(2s 0lthe car?

  09.13: In the figure to the right, a box moves withlpf*t3 0m8cflfe yx 5re. 2:ff 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 kgf fr2elyc0f l 5t*m x.f:p3ef8, 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 rightoem ji6 oqk6+2, 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the toqm j 2eoko6+i6p 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, along a st ha4b.itn*dng42hfs6 -t 1dhxi i kl.8raight road. CarA has twice the acceleration of xii l8hi4*d.k tan1hth6b- fg4d2.sn 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 twb40,, e uyjquhe object during the time interval of the acu40,wj,b ye uqceleration?

  12.08: Through what distance does the object move during the time intervew7am28 edz bq88k6noal of the ack qbe2e 8d o88mawnz76celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point ma81mrg. hm+bwo j4f bl9+ )oigmss 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 kin8ghmo9 mlr.wbg)+ bj+imf1 4o etic energy of the mass during this time interval?

  14.11: A crate gains x) h. vk(c (qwapy d*gn-*xtu636.0 J 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 masca-(p q)wxnv.t (ydx 6 ku*hg*s of the crate

  94.38: A force F at an angle θ above the horizontal is use +w 6mb7(n yolndlp7,ad to pull a heavy suitcase of weight mga disol7a n(wl7m ,6bn+d pytance 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 z/k 8mi,cvzq d j)tu1/delivers a useful power output of 0.10 w to raise a block )q vk1z,cdi8z/mj /tu vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is8m32v7 ygfw tl released 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 y2ft3gvl 87m wkg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a wq)tp b9(9zhs 4ii u+shard floor and released. Assuming that the collision with the floor is elastic, which9 si+9iw(q bs)tuzp4h 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 ig3+ade)o*b nv ;rfbqpxl)n 5 3s moving 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 minimumpv*gnnb q)ao f +ldbx;35er)3 average net force necessary to stop?

  00.26: A 500-gram ball,k3vi :( lwnrie/k,j p moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force app :lrnik (/w,kvp,ij3e lied while it was coming to a stop?

  02.26: Consider two laboratory carts of differen m;o/sbw1rb2d ize 0dg dh+1 cu12ni*wt masses but identical kinetic energies and the three following statements. Which of the ab22wog+e u;d ir1 10 nhzi*/cw d1msbdbove 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 ver*w clhg.bue/ 1aw e+b 6s-)xhntically in the air with an initial speed of 4.w)b-gwb n/a u*+x c.elhseh1660 m/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 str 4-( )ztfjw2u7zt27 fck suqldaight upward from a flat, stationary concrete surface. The boy, of massu 2 (2c sfuqjdw)z77ft-ltzk4 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 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 aheightHw fce i*o-jl42 above the ground. The object crashes into some soft earth and comes to rest by compressing th-*fiw cl 2je4oe 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 the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the grou8gbpuo: nvtn s;yp5.1nd. 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 tsnb :ovnup58y.p1g;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 pulqxj nw mnyf6802bnsk:qc1:0i led sideways until the cord makes an angle kx1:c68nmsf 0:0n jqqn2yibw
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 inclinebttvcjp dq7p8-5b: z, of 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 momentarilyjt8,vqbpd 75b p:c-tz 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 sidewalt+vyd - n1fx/kk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carxdk/1t+ n yfv-ton 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 uip7,ex2n2iuk uh)q wr 8 59hiF=50N (as shown in the figure) is applied for the 6.0 metii)iueu q2hh25, k97x8p rnuwer 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 onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from thejb+ tt,+sp)z8d;nth c top of a tall tower. Ball A is droppe,zj8htp +)d s;+tctbnd 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 massy0e :(zx9l -yat-hh hdta grjpv16. u. M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person (aehh u-ax.zlg-r hyt9: 0.t6py 1vdj 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 a spring constant of 20 N/m.7q,8:j s1 i iiraoruu. The potential :r u1u,q ro8sii 7.aijenergy stored in the spring is:

  97.10: A compressed spring wgj 7l9 guhm+:has 16 J of potential energy. What is the maximum speed it jmgwl9:u 7g+hcan impart to a 2.0-kg object ?

  

  10.31: An object of matb(.f38mwprw 0+udd tss M starts from rest at the bottom of a fixed incline of heightwu.dtt 0 drm3bwfp+8( 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.