97.01: A force F directed at an angle of θ above the horizontal8+ qqf/uzox5bp3 oju-cg2 qp3 is used to pull a crate a distco/ 2x5pg pqqujq3f- 8+3bozuance 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 moving towa dpqdqaei(u* s-9 2e0crd her with horizontal speed v. While bringing the ball to rest, her hand moves back a distancqa 9 2dse0ui -ce(pdq*ed. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meterw 1wc+a/f6m1dl l5zuomu1 :kf above the floor for 4 seconds. During these 4 secondshow much power was exp6+flmka 1d1 czumu 1w :lfwo/5ended on the wallboard?

  17.11: A 5.00 kg block slides wi jzcaaw(w) q39th 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 time. ja)(w3qca9w z
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration yp 3 h;jb9,3xkwgrdy /ubd2s7 on a horizontal surface for uhs3b;,prw /djyyxb3 72 kg9d5.00 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 righ3g3pbx 7 fcxc,t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a hg3cf7xb3x pc,orizontal 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 bcn ;8 ;ne xltfr0ech 20e)-qw3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface. r )0c;qt0w;nhe2 efn8c-e bxl
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 + vs1xug -)tvtthrows a 1 kg hamme 1g) vtvs-xtu+r 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 describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the fnx-jp wodk ):q8m; g7b:v1qvoan has been turned off,m-vjxko ):ng; 71bodpw8qq v:
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg ho-k-jsd7pu*(qg kh7;2hx hme ; pg /bvas a position of 3.0 m, a speed of 4.0 m/s, and an accelera-/(p7u-2jgqsk;gdk hp;*e 7 o vhmxhbtion 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 bookr9cbo psg 16*fa iq/l1g,jku-eoom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from/9g,lck*aoiq6 1f-sp jb eg1u 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 3qr5uaww0a 3: q2 horsepower) of power to a car's driving wheels. If the car maintains a constarw03 uwa:5 aqqnt 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 rightqd,nva o8c- 7lfio )l), 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 ofF = 240N. The box, o8dil 7n,)focvo )aq- lf 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 a2rtq-nn i( ) dlo6t.djt 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 l-q(n.rojt ni2 )dtd6 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, along a straightwqcq/0/ l1 yiycth*(k road. CarA has twice ti/qt h/ y q(*clcky10whe 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?

  12.07: What is the net force acting on the object during the time 6ycfc m*y99/ cb) -totm jly/dinterval of the acmm *bc6yf)ltdj9t 9-cc/ y oy/celeration?

  12.08: Through what distance does th5jj m5i zyk 5.2vdzyw;e object move during the time interval of the acceleratmjv5y j;id kyzz.w552 ion

  12.19: The magnitude of the linear mo2 bb,mhb(ewe1 mentum of a 4.00 kg point 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 wmh ebbe,(b12 in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while8*fi xqek*g -o9*kp u hi4psf, its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices bestih*q9ki*psexg o4 k*8-,ffpu represents the mass of the crate

  94.38: A force F at an angle θ above th: 394tcc iiqxge horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floorgix tc 49:3qic 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 useful power outputft8p/w. -bxfb 6qo; gm 2nbcw; of 0.10 w to raise a block vertically w-cbf/on bmxfb;p2 8;q.6g twat a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from re5b-fb6dflbuj:5 j k:ss95w bqst 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 fbbb uf9 :ssjbd5-5kq5j: lw6 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho abo1x5t t/dzuyvs xt6yd +pd63cg9- das1ve 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 tot/x 5dd1vdx 6tyca3-s z6 pyd1 tgsu9t+al energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/ a-o 3d7cts(hmgdu02 rs. The driver sees a barrier ahead. If the car takes 95 meters to come to rdud3rh270tom -c gsa(est, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s sl j7kx3qa9/uef8de a) h2,w medows down uniformly until it stops. If the ball travels 15 meters, what wasehuj83d7qe9mkd x ,eaa )f/w 2 the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identicalfdx* lyr1zcgvrz/,8z.4 x pu4 kinetic energies and the three following statements. Which of the above statements woul,ycz8 1ru4*lrxxfpv ./zz dg4d 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 thez.knbz q)mk82 air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its hi2 z8zn.kbm kq)ghest point?

  06.20: A boy jumps from rest s pk,py1s )4upkf(rbi0traight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rkif 01 4,sr)pb(y uppkises 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 aheigh2:j u3y; u; t:mwcdiiotH above the ground. The object crashes into some soft earth aum;wci3yjo;2 ui dt ::nd 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 the object while coming to rest?

  12.48: An object of 1 0n2-:nz6du11 zq fa:jtzqvkos( rgemass M is dropped from aheight H above the ground. The object r0ezvt-j1d2( q6 :1no1a zk n: zuqgfsbounces 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 the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways unw/go3bu xoa ;6til the cord makes an angloogwxb/u 3a6; e
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 uniformf3ohhxj 20 n5m incline 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 sh3x0 2 hn5omfjtarting 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 from the sid*k avw.w3u-rgfkib(n b3; n3sewalk, 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, what is the total workr3; 3ak*b .nwin uwk-(vbf3sg done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in tk1 lhap; p;4 oxbe56sw3t1 crahe figure) is applied for the 6.0 meter motion of the box upward alon1l oth4 krcbs apx56e;;wa3 1pg 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 ad.3q:l an +3 )sv)hv6 +l*wglqm gxmnrest 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 mechanical energies of thhx6 n g m gamwl3.+dnv)*3q+lqals):ve two balls changing?

  11.28: A person throws an object of r.ac(j/7jx pqn w,q3*gufgl+er j/9j mass M 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 obj+qr/ j,*fe pqrj3l9./gu ajx(g7wnjc ect 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 Nq6m+ak ap:w)i v4a ;ik stretches a spring that has a spring constant of 20 N/m. The poq4a :+)6;apikkiva wm tential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potas9 k: iipyb) ik*8jtu5q.(wnential energy. What is the maximum speed9btj8iau*y qk(5s n.iiw pk): it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M gb)7w7bi,1q +lowoxy+xa;w p starts from rest at 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 appliwxbipaq1x 7ogb,w yo+7;w) l +ed 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.