97.01: A force F directed at an angle of θ above the hor i q+yyqoig6 s8s.fer+ik:t9(izontal is used to pull a crate a distance D across a level floor. The work done by the forc8 trqgi6s9iiyeks++ ( :oyqf.e F is

  97.33: A softball player catches a ball of mass m,tuf6r bt)ls69 4an e:n 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 exerted on the ball :bntft6l)n 4e9srua6 by her hand is

  99.14: A construction laborer holds a vskogwh/n;dm9,1ov7h1 h m f 320 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendw,k3nov97vh1 / gsom;hfdm 1hed on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hora yxnn7 z8c;hb*9g.gfizontal surface for 5.00 s.b7xyh9;*zg ann. 8fcg The block’s kinetic energy 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 slides withrt oykf: p,r i*ugi6),fic+ )n 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 timrufy:6if+ ))in,, it orckp*g e.
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 dhju4h;x k0 e*w8qhlp-irected to the right is exerted on a 3.0 kg block for 5.0 s. Thexhh0 j 4wheklp- u*8;q 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 xkll4k)-n -ur;pw xd4exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horr)k;-- uw4llx kxpn4d izontal 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 tgg sohqo32g4e 4wfq:3hrows a 1 kg hammer in one direswh 3qg4gfg oo:2q34 ection. 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 fs1fk,4u(rxy6 yjh0kuan has been turned off,6hyu (uy1j0 s,kx4kf r
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0. uu8 xv6tyc *th9hrqob ca): 6rt,v4v+50 kg has a position of 3.0 m, a speed of 4.0 ctc9 4b8th *uu tqv6ra :rho y,6x+v)vm/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 textb:pb,d6a)pm d aooks is 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 floor, how much work does he do on the box. The box has a mass of 1mpaa6,bdp: d)0.0 kg.

  02.32: An automobile engine dl 3 h8p34rpmmqelivers 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 tml p 4mqh3p83rhe car?

  09.13: In the figure to the right, l*cazu2h8ra -r xs weuvq5);: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, of mass m= 20.0 kg, has a speed of 2.50 m/swhe: *evr awz)ar5c ;qhusxul8-2n 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 mwh4on. ni6st-r7 x i2c/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 lefir 6-xw4otn2c i.7s nht 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 stw .gq; y h04q( c.0khzr2azttmarting from rest, along a straight road. CarA has twice th mqy rh0attqchg2kz04.(w;z.e 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 tctxv4opymjvu1* v ;,zm*x 66on the object during the time interval of t*ot61m*ut6 v4;jyzv xpvx,mche acceleration?

  12.08: Through what distance does the object move during the time interval 2zq2tnpa oo6w 2gp9asb6oyopt7+e(/ of the acceler967bq ao( p22+ensa6z/ 2y togp woptoation

  12.19: The magnitude of the linef*oda- (p8j iear momentum 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 i-f d(8aej*op of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speeu x5ox 3acrk1poc-21rpp )o8sd is increased from 2.00m/s to 4.00m/s. Whicpp53a) 1p1o so c2rckxo-8rxu h one of the following choices best represents the mass of the crate

  94.38: A force F at an v-sip87fzeimojvw. yw br6x*6e . ;o-angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant vel7x zv; bw6i y6fmv-jwo. io -.*8psereocity. 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 deyc7 l+niy,g-is7an/ j xy 38onlivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this siyyo a3 7ijnx+-nl7n/ ,8cygcrane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the :c4yw-3/d+ngh9/ff/st bl hwc musp6Earth, the gravitationhf6:pcb9w3/f/t+ /yscw4m gs l- nuhd al 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 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a ha3l km wom*js8+rd floor and released. Assuming that the collision with the 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+sok 83mjl mw* above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If th jwi,lwv )*v/ha2h1k l va)l 4w+i;fmpe car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop +l)il /kmh,f1jlw;v)4*ha 2waviwv p?

  00.26: A 500-gram ball moving at 15 m/s slows down unif*g1hr*wc fi h0ormly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming t*h01w rg fi*cho a stop?

  02.26: Consider two laboratory carts of different m ,hkwtloh;/k .x nm ug(0;7p3gz qxf-jasses but identical kinetic energies and the three following statements. Which of the above stkwn;.l m gtu go07hx;q/jkz- x, 3p(hfatements 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 vertically fh- 9k8sif82c;mb* xs1bk ,mlvvp9vr in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentialfxk8b81p;sim9kc fv-v , 9mhsrb*vl2 energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary (1ln89 fpixk- ql*s o:djc- y:h4 umwqib.9pw concrete surface. The j h1i:x* :b 4yc8ufqpn9lw o k9s(-mq.p-dwliboy, 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 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 ground. Th)lpr7rjr . ,59ipn wfye object crashes into some soft earth and comes to rest by compressing the earth a.)ryiw57 9pprn, rflj 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 droppds ;:torti j /c0mh2t0ed from aheight H above the ground. The object bounces 0r mhidtoj2;c/t0t s: 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 side .qs;sm xfu8fohip4:c/at o-un8r m ..ways until the cord makes an aff c /uo: nx.4mhqa; u.op8-r8mt.s single
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 slx flwg14*v.k1f+f gejed, which started at tf k xle1vj+.ffwgg4 *1he 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 returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartorwplmd2cjz n26eh -lx wpq5rc.c//45 ns from the sidewalk, along a 10-meter ramp to a loading dock, which is qh2/xew- mcc5d4jp.2z/6l 5c rwlnp r 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 move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is app38lc1dznvn0 ulied for the 6.0 meter motion of the box upward along the incline. The mass nlvz183d u0 cnof 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 lk,mlc/; tcw16 fo7 h;nhemu.balls 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 the ground, how are the mechanin e ;lkm,hhwcc;/f. umol t617cal energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an i yf 9phn di 8-ohgtf,.ao5 1xgqc eq7+e++lg,hnitial 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 he5ycd+i8nh oaf+7qfpql,e+19. -,hg h xg togeight 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 consb5osgta ;bf( ) fbl8a0tuy0tmv)48 mztant of 20 N/m. The p8tfoy)z;b( mas b0m 5lvagfu8 40t)t botential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potenti 77x( lax51ubnp arzq6al energy. What is the maximum speed it canx5ba a7u 7prl(6n qxz1 impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at th2lpr ,tq.,ujv cc4 l2oe 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 .olpt4,2,crcvu2l jq 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.