97.01: A force F directed at an angle of θ above the horizontal isf1ikotr+ ucvb+f ,yk-4/2b bm used to pull a crate a distance D across a level floor. The work donmt vf1fr /,k+2bck4ibbuy+-oe by the force F is

  97.33: A softball player catches a bazx-q v4d m941wouxt6wll of 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 ex wm6x 1uq dxv9t44owz-erted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter 5v4g*f69f4cx0-pr 0uwul (hlswr ophabove the floor for 4 secou450xrhpw pl6urf-l*g0(s hwo4 cv9fnds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal l 7fk lkd)l+/psurface for 5.00 s. The block’s kinetic enpll7df)lkk /+ergy 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 sli*k zqpy*kp+)c/qrz , ades with uniform acceleration on a horizontal surface for 5.00 s. The blo/+kc y rza p),zq*k*pqck’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 force directed to the right is exerted on a 3.0 kg block fw. .fe2g2dk3i /czu uxor 5.zu2ikw c. uf2x3 e/gd.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 direio uvat7mj ds(t:* we/9 2/ovhcted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at resiht/ teadj 7oovsv /m9:*w(2ut 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 gked mn2 t0g,4at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directio4kmge2n, t gd0n 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 andn q:a8ybpv-u )6bq. jx gives it kinetic energy. An hour after the fan has been tuyqjnp.bbu8- :x) vqa6rned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a4 k+yxl8 +yq8f*lmal z block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration oqx+*y m4k l8z8lfya+lf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is/la 4isi/vaf 8 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 flool48iv/sfa a i/r, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engi0*h)jk1gx.d;fij v9 in gd oh0ne 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 retarding force acting on the ca1* i hgvgfx kinj 0dj;90)do.hr?

  09.13: In the figure to the right, a boxkt: tu-(dyn i.gr: +tn 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 = 2-nu: td:+r. gkntt(iy40N. 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 movxxx: *o8l 3y5z ml5 zdn8.noyd, q;kiwes with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with conxmiloxw:,;5kyqdo l.nx3y*5 8n z dz8 stant 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 froq,/49wx8 rfotkf- 9 xglk(so sm 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 traveled the same distance F, what is its speed in terms of B?- k9f,w4t lqrgk(o 9f/ soxxs8

  12.07: What is the nakzl g6og/2c*t2rh e 9ki1r t*et force acting on the object during the time interval of the accelerationri2hrck a1/26*etg9lk g tz*o ?

  12.08: Through what distance does the object move during the time9o) a0+ fh/3kxdb1yq)mw lhptzsr p ,- interval of the acceleratipk b/sahofmz 1+ xr)9ty)-wq,dl0h 3pon

  12.19: The magnitude of the linear momentum of a 4.00 kg f9s jq;v/-k,c .nsrtzu lw s16point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of,vf z.w6jk; s91u s -t/slcnqr 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-+banw d*l8f d while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents-ldd8+ *abwn f the mass of the crate

  94.38: A force F at an angle θ above th9i* m.6yu2y g2gtmmx ;o xld 2tn+icz7e horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at; dii ylz+y2t.mt 2 2m6cmxxung 7*go9 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 u fkgcs9auvo; ww)s3(* +g1rhlseful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speedrf3hs+s*9a c(1 gg )w wuv;lko will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rel-hd:ku irr1l0;x1 mlxeixr7*+.o i hyeased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the xykiehdirxm 1l;xrr1.-:u7 l* i+0h oEarth 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 tb*qjm/m q4s * xmwvmyk2a-iej+ 809 qmotionless a height ho above a hard floor and released. Assuming that the collision with the qi * x*+mqbjmw4a jey9ms 2/-km08tvq 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 above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver se a)pa8vef zkzi9/f a((es a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum ava(ak f98zp)/f v aiz(eerage net force necessary to stop?

  00.26: A 500-gram ball8n2di466p- spuip oyw moving at 15 m/s slows down uniformly until it stops. If the ball trave pp2-d6opi4 8usn6 iwyls 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two lavwmqs/eii.32v :gsf k. fx 64mboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements 4 .q. fxvg6se m/:fv2wiim3 kswould 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 tmlyr:,;dru: os,xm *u w33g9 a k:kttche air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ext,m rka3t9g;ud: uo:*w l : ,kcsmry3nergy when it reaches its highest point?

  06.20: A boy jumps from rest straigh;y,wq2r 7 : b.l*xeyg r*zvgvtt upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface wi * *v yzx;e g2ywvl.gbt7,r:qrth 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 i :ibhc/(ak(xq s dropped from aheightH above the ground. The object crashes into some soft earth and comes to ribxca: (h( kq/est 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 the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The obl3(nzw l .s91fhcy ;)iap 0sqxject 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 average netwps)( .3ql1hc9yzia slx ;f n0 force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the29fyrsul k71x:tm3e mxycq-- cord makes an anglsltqcmme2x91k 7:u -f-yx3 rye
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 sled, whi-j 1bp;m1ppq+dyv iq)k + qn+dch started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its b )kjqq-+pi d1+y+vdqppm n1;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 frompc gkt;wb g1cm*aw1 wg3v6riaa/)z(2 the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meteap brww1v/)2;6c(am 3*ggic1 zgat wkrs above the 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 for the 6.0 ei,ot5 tm 5ay8meter 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 wormy5 ao8,ei5 ttk done by the force F onthe box for the motion?

  04.48: Two identical bowling balls 6r(o mv7mrbd5 A and B 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 trmom v6 d(7rb5he ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straig8ukitvtal i)- hi+ a+4ht 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 terms of H, to what maximum h ltvi+k4a +uiit)8a- 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 hast tm;;zvtm 7d4 a spring constant of 20 N/m. The potential energy stored in the spring iszm dttv; ;m7t4:

  97.10: A compressed spring has 16 J of poteny*1o my ; yxhk)3zw9hgf:;tx ytial energy. What is the maximum speedh t9;zyhmg)ky3yx o* x:1y w;f it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest aty woctl9i17)dtk* a8d the bottom of a fixed incline 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 block8kddt y7lc)toi*91aw compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.