97.01: A force F directed at an angle of θ above the horizoco,p9 + .prrrwntal is used to pull a crate a distance D across a level floor. The work done bcowr 9p.pr+, ry the force F is

  97.33: A softball player catches a b 6vld:xg8 2w7onol*pn92n echall of mass m, 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 exe*nvxl8h nnc6:7 el92g poow2drted on the ball by her hand is

  99.14: A construction laborer holds a 20*mh )t*q+l i 0rw ic)8klnr:gp kilogram sheet of wallboard 3 meter above q)+ c rr)in0mllgkt*p* 8hi:wthe floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on xhz(+ i(x9lhxk:,e hca horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J hi9 e(xxhzxhl k(+:,c 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 unifor8lye 5da2pm 9rm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in2r8ye9ap dm5l 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 b- x4do8 (lvhrthe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horiz8o rhxdlv4- (bontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forc vyb0fkisrh ;t:)54 pye directed to the right is exerted on a 3.0 kg block for 5.0 s. The block wasritfyyv:;p 5)h0skb4 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 throws a 1 i-4jo bdpbl /gk)i4/wkg hammer in one direction. After the throw, the hammer moves off in one direction while the student- kb l4j/)b/diip4wgo 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 en3 z2z46srthy oergy. An hour after the fan has be3 ht6szo4r2yzen 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 a position 9--no9 3uwj)ur.wpve r6 3s9kgi yoseof 3.0 m, a speed of 4.0 m/s, and anv woe3)-uss-.jwe 36yikr9r 9 on9pgu 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 ls .aha2n)/r,7 ) g e msxcm6wbdn:n 6zzrgc,6the 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 ws s/rm6m)z n7arn6 .al)h,d: ez x2bcngg,6c 10.0 kg.

  02.32: An automobilev ubjmjje3qm, 8+ *b00lj0xc6crspm2 engine delivers 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* jrucm+qb ,206pm8c0 sje 3x0m bjljv (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box mov:jj*avuk1*ds zj)o:mon+3os es 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 inclizav*:+os dujoj1n o jk:3*)msne 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 moves wp5:c9:*gffdl0z1y/qn pto y m)3ve s with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top oe):9wg1o/:*cmdfl3 sy zpyp0tqf 5 n vf 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 travel to the right3j ,ir8cqbx j ms5g;b0, each starting 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, what is its speed in ter5;3rgxjq,mbj08sb ci ms of B?

  12.07: What is the net force actink) 1wk9 me+fbp/hxr *n5tg n1ig on the object during the time interval of the accelerationmt1 k+fighb 9nre1w5xk pn/)*?

  12.08: Through what dz0kzslk8j, 91 1 bbs0s3brhxkistance does the object move during the time interval of the accelerations9zj0 b81xz1 skls kkb h,3b0r

  12.19: The magnitude of the linear momentum of a 4.00 kg point ma3 (r9v7kcx ldoss is changed fro 93(kcl dv7xrom 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 interval?

  14.11: A crate gains 36.0 J of kinetic ener +l 3)ydt:nb2 y3qck 1uaw.4pg5cmboygy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mbw)lq cyy.op :ng51a yu33 d4kbtcm+2ass of the crate

  94.38: A force F at an angle θ above the horizontal is uoh4 2eyt+ f3pvsi*hq (0z n6xysed to pull a heavy suitcase of weight mga distance d along a level floor at xes hiq3htnp 4o(*2 +yfz0y v6constant 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 and delivers a useful power outpue nl8yuea+3 )jt of 0.1e u l3ea)ny+8j0 w to 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 surface of tmt v(8jjh56sl+ ,yyjhhe Earth, the gravitational force acting on the 1.00 kg object by the Ejmjyt5 (,8j6 h vhysl+arth 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 hard fr5,osc(3rkbvatk. h2h *bkt xak8 z:: loor 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 th bhabkk38srzo(a5 , hk:*tvrx .tck2:e ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. T:btkzxrl f d 3kez119r9 rz(i,he driver sees a barrier ahead. If the car takes 95 meters t(i1ze zb9k x3,:drk 9r zfr1tlo come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowsor6h y 9 yc(pzmaw5c/6 down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming toma5cw( hy9y z66cpr/o a stop?

  02.26: Consider two laboratory carts of different masses but identical kiu 3e7h 7gau0uxnetic energies and the three foleu a x773ugu0hlowing 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 vertigy 9y8dihg6cktp5xyu6 0q ;/ qcally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy xq/p0ytg59 iy g6hk6cyq u ;d8when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationargutzh3/j4 z 7mpd f)y9y concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his cente4dtjfmu/z3 7zgyp) h9 r 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 dropped7jtd ) j1oxirj -cx: viemku)/0 i;je- from 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 force exertjv/c dmj j0i;17 kjo:ert-)eix- i)x ued by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the groundma+ni( .kjfn3 wb(i ,d. The object bounces off of a horizontal surface in a collmb3 a.njn+fdiw(,( kiision 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 Ld7,pe baxs*7cs0 h t3l is pulled sideways until the cord makes an adbca 3lsx7s0 7e*,phtngle
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 angled7tqw--5hbrbks4 qyu (*.si )ydx wl/. 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 returns to its original position at the bottom of thdqxs- b htw /q.-k4* ) s(lrbyi7dy5wue hill?

  06.09: A deliveryman moves 10 cartons from 2 sh:pmp7.eb,x d/wcqez. u.tthe sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 metez:p.e . up sdh2bec mw,t7.qx/rs 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 forc02) czmdoj nd.50vaoxq os15ve F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The massav1d0d5.m v5 2 z0j coxo)osqn 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 identicalwfi ni. ca)v73 bowling 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 ian3v cif). iw7s 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 initiall03v qje 6m,1mqub(bkf9qfoue9 :8 b a non-zero speed v. 1bbef ueqk 6 qb:j9ommu3 ,9 q(a80lvf 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.

  96.20: A force of 10 N stretches a sprint6v; 8v:)d r1kveqqvw4 9hczu g that has a spring constant of 20 N/m. The potential energy stored in the sprine 196zv)vuw dqvcq8 k;:h4rv tg is:

  97.10: A compressed spring has 16 J of potential energy. What is the mag 5 ;l3vwc)eirximum speed it cw ;e 5irl)cv3gan impart to a 2.0-kg object ?

  

  10.31: An object of mf3qg rq(m4j kw,/yw 4cass M 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 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 compaqj k,3/44r gqw(mw cyfre for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.