97.01: A force F directed at an angle of θ above the horizontal is used to p0 +x h1g5pryeyull a crate a distance D across a level floor. Thepxyhe g0y15 +r work done by the force F is

  97.33: A softball player catches a ball o;25mhpvj 8d tmf mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distancedpmmhd58 t;v2 j. 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 w wpu0 ur ar,8yxpeo(*k(f ,9amallboard 3 meter above the floor for 4 seconds. During these 4 seconyrmw*pf(8ka oau9 p,,(rexu 0dshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with unr**3zan8jhm5ap3mr jiform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energnj rmrap zamh8**353 jy 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 wib3kht2i* (p hhz8,.c * g5wbsxee7tl pth uniform acceleration on a horizontal surface for 5.0bse.k72w5c bhh hl ipt(p8* *3,tzgxe0 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 right is exerted on a 3.0 kg block wy :a1llw0 d)c1/gg zhfor 5.0 s. The block was initially at rest and slides on a hoyzwldag c0hl/ 1):wg1rizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forcep;q br6ae,(-z /i *ai g+jplfs directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially ai f-s+pj( *p/6raqle,gb;aiz t 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 throws a 1 kg kzkkm5z3iv-6.)p y c cg/gub9hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction.3 kip -cgmvg yukzc z.5k/6)b9 Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kineticbre1utyu98 vf.sum4 f yi7z:4 energy. An hour after the fan has ber9uybyts :.eu7vf841fui mz 4en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has 9vld w- o/z2q c0ar0qja position of 3.0 m, a speed of 4.0 m/s, and an acceleration ofcrl/owzd 0qaq9 2vj -0 $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookroom 1.3 m fe1gc:86bvl 2upmor/d: us2bxrom 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 10.0p m 1r6:obl:dvguux/s82c2e b kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) 4i9m*a*xk -.xu5)as euhd/b nn7raqh 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 acti-dru*m.b 7sie5a )h/hxx 4ua*na9nqk ng on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s )0w (fxgyesg 7at 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)e ys (f7xgw0g 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 moves with speed 5.00 m/s at the bov qyx7qqs-* d)ttom of a rough, fixed inclined plane. The box slides with constaq7v x)qsd*- qynt 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 travel6m38 a0ooex nb to the right, each starting from rest, along a straight road. CarA has tw8mabo6o3en 0 xice 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?

  12.07: What is the net fop;byi 1utf,b-l7 o kqib2d b 2m,7q+svrce acting on the object during the time interval of the accelerbimt2b-p2, +k u 7q;vb1l 7isoydf, qbation?

  12.08: Through what distance does the object move during thea0s r*rbf tc7- time interval of the accst r7c0-ar *fbeleration

  12.19: The magnitude of the linear momentum of a 4.00 kg po. 4g;,ocda hn3i/kfzoint 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 giz3dk;oo,c n fah/.4kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of k qrgx32xqx1w20pw ot)t98qo qinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represenptxq0 txo)22 1wgqow3qqr8x9 ts the mass of the crate

  94.38: A force F at an angle θ above tw kq5.q;.mu ivdw(6 1qxq +zxwhe horizontal is used to pull a heavy suitcase of qmz+w. 1uqw.( v xk5xiqq;d6w weight mga distance d along a level 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 exer,ho9 oqev4nb -ts an upward force and delivers a useful power output of 0.10 w toe h4v-oq9n,bo raise a block 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 released from rest near the surfackh 415o mjd9tne 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 kg object during the fall?m d o9ht1nk4j5

  96.18: A rubber ball is held motionless a heih7+lcr awvo1p 5j(,klght ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of thc1jvw rp k 75h(+lal,oe 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 sees a tbit 4/0bcj d/barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average ne/ 4 dbb0tjti/ct force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until a8o-nc6iv kxr //sw0pit stops. If the ball travels 15 mec6o 0k /8nir avpx-w/sters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two lab hd kftf21zl i48k)2 6tdr b2d8vnbhc9oratory carts of different masses but identical kinetic energies and thh ti4ddlb2f 8d)kt6f128 cvk2rb9 zhne three following 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 clay6 vw ;.hxrs)fi is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential)hir x.;fvsw6 energy when it reaches its highest point?

  06.20: A boy jumps fromg22g 3rg p*z5z mmtpo; rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of masgprz 2pgmt2;3g*o5mz s 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 mlpa1s+4m bmpz6x /r+ aheightH above the ground. 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 the average constant forca6rp 4xz1+m/mpsbm l +e exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dp;cp i0o3:lvzeeoa(5 lgt-( eropped 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 fgt o:-vle ;(0 ilpea3ep5(ozc orce 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 the corw6 xz;vl *2yj- hjmld--gda w+d makes an a*jlx-dyja -d vgz h;+ ww6m-2lngle
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, who1n d81sc 29s0 tdtbiexz8k2l ich 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 hilll1tds e8 nc9sxdk182zb 02t io. 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 sidewalk, along a 10-meter r*lz4j 5r znmt*amp to a loading dock, wtr*l4 z5 zn*mjhich 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 move them to the loading dock?

  12.16: A constant force F=50N (as sv l4) +x;tkzup3mzf*a.qi 8br hown in the figure) is applied for 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 box for )*+f.pzzxam8v4 ;l q3rtbikuthe motion?

  04.48: Two identical bowlinc- 6l3buc e3stg 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 iscs -ce 3t3lbu6 dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws anc nyc81 f9-z c5:rlpal object of 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 object of mass 0.5M straight upwar1 y9n-:lzr apfc58lc cd 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 N stretches a spring that has a spring constant x, ks.29s)lz.7gh;ei,3+vov oqqfppq hjf1v of 20 N/m. The potential energy stored in ,7opip ff,q.o3g2 v.kzlxh s sqh) 91qjevv;+ the spring is:

  97.10: A compressed spring has 16 J of potential :- y8-(6pvizxi bzex 2bel( xvenergy. What is the maximum speed it can impart to aex( 8i(2 x-blv xbe-z:py 6ziv 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at mkgr9,l5;k 9jmwje7 fthe 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 trial k9rm7jlf;gmk5ew,9 j s, 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.