97.01: A force F directed at an angle of θ above the horizontal is pl gr0y99n; 0rup ik8ibcf3ae k2;e0vused to pull a crate a distance D ac ck80pk 3 yeg0er;ua r2ln0 bi9fv;i9pross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is usom48dbwji ;i.ov 43dbt(* u 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 exerted on the balivsb * uj3i84;4um odwbt.o( dl by her hand is

  99.14: A construction laborer a-6)rp9b 3 lgi;s4agamtsrbda(rn0/ holds a 20 kilogram sheet of wallboard 3 meter above)a 0arsr/g sd6 gbarp nm4l(9;bit-a3 the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sli)x0 d5ly:pe3 +totrsfn 5(zbtdes with uniform acceleration 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 tr tnf)5+3z xstpol d0tyeb(5:ime.
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 suy ob jg7t5j.ysgc;ttt3 3*t;4fe5j gzrface for ecto y;y3jt*7jg;5bztt 5g.t4sf 3 jg5.00 s. The block’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 ri-xyfm2) oez5 mght is exerted on a 3.0 kg block for 5.0 sfz 5)mm-2xo ye. 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 exerted on a 3.0 kg blocxktr35 v /evg9k for 5.0 s. The block was initially at rest and slides on a horizontal surface. x9rkv/e gt35v
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionld4 l-o /;mpd5ovdzxvb*4 g7 utess frozen pond throws 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 following correctly descrivpd4dut;- 4*xo 75olbzdgv /mbes the above situation?

  03.14: A fan blows the air and give vinzb,p //+x2miw) +it7 pu25stwqmvs it kinetic energy. An hour after the fan ha p i/x tqtpv/5m iu)wn7++,i wmbv2s2zs been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of massq r,e dpkt5q(ywyy6w; pm949n 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerati,nm6 y p5;y9 dwyewq pk4t9qr(on of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is oudq8m 1p7 /8)lrrpfozf6zwc.n the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shel 1uwzm7 6lr8f.o8pzr cdf)q p/f 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 (abob7zs4e n(*k ts* haxi ld-; -7fbhxzd3ut 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 retard 7k-la(7* zhzsns f4*3dxxhb-b;ited ing force acting on the car?

  09.13: In the figure to the right, a box ox 5 ei3j1enl.i0 r8vrmoves 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 d0xi.vr nje rloe 15i83irectly 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 moves with speed 5.00 m/s at t a1nyn. go5;tucwp38she 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 tc5;nwnpsog1ay .83u 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 r f5bv0 uc7wgju 7iv+hd s/p1yiv; p;e*ight, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveli vp0;;s iygv 1* i7dw/vc7uhf bjpu+e5ng 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 tvmoscq p pz7; rv3gjq-.2*s- an65fafhe object during the time interval of the acceleratiogcp *pv6 7ao azjq53f-q;v2m fs rs-.nn?

  12.08: Through what distance does the object move during the tidv 8s0c)ez(zsq+ jxc2me interval of the acce 2qs+)x(d08sc zvjcezleration

  12.19: The magnitude of the linear momentum of a 4.00 kg pn7yw-8l3uecn r.ro*x m4wlv0 oint mass 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 kinetic energy of the mass during this time interr4xno -m8wylu* l7 nr3 ve0c.wval?

  14.11: A crate gains 36.0 J of kivdj n 3lps2by 9i u /m.ny0s87utwav0 ,0ep.rhnetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cp9,yns.32vsu jreh0 m0udwa87.ln ypv0 b ti/rate

  94.38: A force F at an angle θ above tn1w bfa0yo4 y.bc : hso1 up1rh6el4z+he horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The pbo 1.hywresylz011n64 of +a: cubh4coefficient 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 forcezch5ma9 e0: yg/yaf w: 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 raise5 0fwgyh::ez/aycam 9 a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neadzfli she-f, c)q o110r 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 itf q z)efdcosi-0,l11 h 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 he rzngphl(k p **t8s:,pld motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the follhlp:nsrz *, p 8ptg(k*owing 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 moving7ouart-pgs x ,fkmg:qbc 4,-) 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 force necessaryf q kb,7xstggcp-om ,4a:r-) u to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down umf46jo* i;s7eyozi/hi+i b1rniformly until it stops. If the ball travels 15 meters, what was the average net force appliedif/yj zi boe+m 7 s1ii4orh6;* while it was coming to a stop?

  02.26: Consider two laboratory carts of di xim3o h)peg)p1m( ul0fferent masses but identical kinetic energies and the three foll )i13mpp)ehl xumo0( gowing 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 vert334jbadhefd6y/je0fu id* 8cically in the air with an initial speed of 4.60 m/s. Ignoring air resistance,fjc/hb* jf 8a6dud ye30d4e i3 what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from s er(g28t*ifkney9t -a flat, stationary concrete surface. The boy, of mass M, leaves the ce29- tg(sy*ke n 8itfroncrete 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 aheightH above the grounddf ;zpkn( rteglk8mn9-9(7c ( uj gyx). 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 thejt97m8d gxyr p(;nu(k - lzek(cfg9)n average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of ma-grtmj 0s/io2ss M 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 the average net force acting on the mass during mt /2gs i0j-orthe collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pullevr12kr),rnur fgy :)wd sideways until the cord makes1wk2r),:yv frr)ru gn 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 inclxn:v 0fethsx )-* mj9iine 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 momentari)9emx h-f* stjn0x:ivly 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 p it;17bi-dz8rm +qa tcartons 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, whaipz;- 7tib1r+a8m dtq 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 figure) is applied f9w4s wlby18 bfor 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 onthe boxwbblfys418w 9 for the motion?

  04.48: Two identical bowling ball;py8 z ;cau1qd.; isfpd47i7/vsibzps 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 th 4iz.acisd u;p;pvq/sfz17 iybp78d;e ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M mcak3effv5 s3*3ba s86wn uam o0,jt* 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 terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance, afn m3*ft ba3e0ou*3wvajs 5c 6k8sm.

  96.20: A force of 10 N s 9+e,iulu;m eqtretches a spring that has a spring constant of 20 N/m. The potential energy stored in the speu+mlui, 9;eqring is:

  97.10: A compressed spring has 16 J of pj*mqn4k7)0pn;ux 37 ari c f vutpwew 388i(ozotential energy. What is the maximum speed it can impart to a 2.0-kg( pf* jxtnwv4p)3ca8oz37k; 8uqw7nuime0i r object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of 86*n 8 y-x x8vtkxj dyjff2dni +eb mh8x+t;3nheight 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? A3xx-ynm jfdx*e8tk6+;dv8 h ty xb 88i+fjn 2nssume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.