97.01: A force F directed at an ag058upg1 eq uw,+pf+.bt)sp ra0nt i yngle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the fope+wb5frpiq.u +tst10 8 u g0,pay) ngrce F is

  97.33: A softball playeryh2wb duweqqa+i w6mr)55w/34 jz p k/kz6fx) catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ra z/3w)k6qbi2k x4/)qjf+ hp uew655ywm dzwball 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 , usje0 ivdb2 kj01 gg11kw/bmlaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 01vkdubj1j,b1g0 s2e/mi gw ksecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block yi4 e :p+ivok4 kh1ru5 slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly deckp vr+ kuey4 51h:4oiireases 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 on a horizontaccuhad wyl z:.r 75(/ r*m-ajzl surface for 5.00 s. The block’s kinetic energy strictly decreases f5:7/.(rd jzc rlcaywzu - am*hrom 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 fordr 8g+ht8, wuemec.u-ce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slide8huu d+ .tee w,rm-c8gs 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 2oo9l* d9iei t sj+:zkexerted on a 3.0 kg block for 5.0 s. The block was2kzid+:jle ti9oo9s * initially at rest 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 at reston a frictionless frozen pond throwsxur-rx9g ;*pif a3 h4y a 1 kg hammer in one direction. After thr- xiy3gh* 9fa4xrpu;e 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 thm+8aal hn3q-c e fan has been t+mh a3 a8qnl-curned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant,zj4 tu :l3ah/n a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, j:/zutnah4 3 land 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 tp)thc)6 bjuc 0*( jxlmhe bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the fx0ju6h jm* tblp) (cc)loor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000sp :hpdb w7ve5k62el0 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintainpdh7kw :s6lpe0 v2be5s a constant 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 d7nrok ,71owhas0 .xm to the 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 to th k7wx.1,ma sd0no7roh e 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 the right, a box mov)qoy(x 9r5 lnpes 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 d)op(nqlr yx59irectly 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 s8ilq6e29piat * enzo 4tarting from 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, p6zao94tq*le2 ie i8nwhat is its speed in terms of B?

  12.07: What is the net force acting on the object during the time xult9jay jnw ;a). 8j3interval of the accelera.y 8waj j n;u)l3axtj9tion?

  12.08: Through what distance does trw8ik.l slv.5 he object move during the time interval of the accelerati5.8.kirsvl wlon

  12.19: The magnitude of the linear momentum3d t:h;cwzdl7rlngby4i:g*)h(j6j x 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 in the kinetic energy of the mass during thizc7glgt3hw6) bj*(n:rxdlh:d4 jy;i s time interval?

  14.11: A crate gains 36.0 J of kinetic ne q:oabin(lf d-)(.b energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices beqlni bdbf(:.(oa e)-nst represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy sumq; 534l i*hw cv-2vuuez7sig(p1 oyuitcase of weight mga distance d along a leveuqgy3w4z*hcl-oie7; u p 1s25 uvmvi (l 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 a+ht.r;2 gn:hq u;otkand delivers a useful power output of 0.10 w to raise a blocttorguq.h; 2 :nh +ak;k 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 is e0 9/-wid1jtr hev0 zi lfq:c z7-mh*hreleased 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 th-lh0zimvw7iqh*c z0-1 etfhe9 r d:/je 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 motionless a height ho above a hee ujo2;bs4(s-d lsr 1ard floor and released. Assuming that the collision with the floor is elastic, which sbseo 2j4(ur1 -e d;lsone 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 movid m ,q gtt9pb.r/ju4 +9vq2 h1i4vwitwng 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 miniqh.mq ubwivd/tg4v1 9r,w 9j2 t+ i4tpmum average net force necessary to stop?

  00.26: A 500-gram ball moving abw4idx aa(v kb,0ht9jv -)0 0o xgyv:ot 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a st)hx0v o 0w(4xbdjb kvy,a9 -ai:t0o vgop?

  02.26: Consider two laboratory carts of ca rbeso 766si 5l)a zgvot991different masses but identical kinetic energies and the three following statements. Which of the above statements wou 9 6zgso6blota1e 7v9i5 )csarld 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 tos 7l f;x7swy59 zcl ik.e3e(fg jx7d9gused vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is7 zjgd l (5f7y9kelwiesg9 3c.x7xfu; the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete s kk+7nly ;z4r3 y.hw/riye9lf urface. The boy, of mass 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 normal4y l;lw n rk97r3kz/feyi.hy + force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dromjv+msm :(hlqgv97s -pped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distah9-sv+m lg jm:v7(smqnce 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 dqg cj6xs*+b- 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 magniqcbd -js x+*g6tude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lex mb owtq0re p8.7w3z4ngth L is pulled sideways until the cord make3btzwep.xq r40 8m 7wos 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 angleim47x nup5c f ) 6(m0 pbs/yeho8lj3ei. 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 momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it r)6 ms85pemb3j/l n4 e0h(o7 iupify cxeturns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10 9dap.ey0d +g0z fbct+-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 work done by the deliveryman on the cartons to+f0 g0d9. eayz dtb+pc move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is a 12) u wdxi+b5zq9pvwl4k4o cspplied for the 6.0 meter motion of the box upward along the incline. The maswx9 c2i4o+pb)zkus5 4 v1d lwqs 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 the uk-fj:nb1pi-b, t;qktop of a tall tower. Ball ku,t ;- b1qijkpf- nb: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 the two balls changing?

  11.28: A person throws an object of mass M straight upward with an inpti(2 q9t l 0)tocs/qxitial 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 wts2 itx(pq q9t/c0)lo ith 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 27 fosy5klr-:b 0 N/m. The potentlfb -ky7o :r5sial energy stored in the spring is:

  97.10: A compressed spring has 16 2 f7jxyl*oehjni; /r1 J of potential energy. What is the maximum speed it can imparr lxf jjyhi7o/n;1 e2*t to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incli79 2dwkw t,kl,pcmt/o ne 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 /cwk o,2, dt7p ktlwm9on 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.