97.01: A force F directed at an angle o+ .ep3vs: *jl jz(j-8nton csjf θ above the horizontal is used to pull a crate a distance D across a sn:83p olt- jvz sc.en(*j jj+level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her wi(v/*klcv6b a ath 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 bv lab6 av*kc(/y her hand is

  99.14: A construction laborer hol + b ) jn:1fekvj4k6-qwnlg/q/h ol1wids a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much po)jg ike w4/wq6o khjlf1q-nl:+1v nb /wer was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ackqo ltvkkk 4rqzv/uq-2sv : (66n ,ax6celeration on a horizontal surface for 5.00 s. The blz 4kk o vvq(xr62t6v,-q:/nklq6 akusock’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 with uniform acceleration on a horizontal s d;jmnnlm0g8, 4a 7cx:j.8o4syrbefjbdtf 0 0urface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this timfxl ebm,c nrd0jf08tby; mja4 :0. gs 7d4o8jne.
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 fog4 re*6 dv pld3h;vbc)rce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block wase6rc v; gdb)lh3v4dp* 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 diredm)w;0abng;s mloc ;a/a cz+;cted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizont0 z d ws;;;o)m;aba+lncmga c/al 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 threqhi,3a2q5c n ows a 1 kg hammer in one direction. After the throw, the hammer moven 52eiq,3qh cas 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 airjl5rlnyhmx7e i /q+;/ cwbe1 ) and gives it kinetic energy. An hour after the fan has been;//j xrilewehb n) yc7qlm5 +1 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 of 3.0 m, / v 8rs1vfm2dt(lu;wka speed of 4.0 m/s, and /21v lud;vwkm rf8st (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 she(p m3rft9soe 2lf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m3(o92fet p smr from 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 32 hornrz;s/9 h jor3sepower) of power to a car's driving wheels. If the h;or9 s 3nzr/jcar maintains 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 to the right, a box moves with speed 5.00 m/s at the zq. k)s(rhez3bottom 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 h3 r)sz(z.kqe 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 atinl4- * eqewv- 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 qi ee 4w*-vn-lkg, 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, eachm+usl4 0w8 o nz1bzl9l starting from rest, along a straight road. CarA has twice the acceleration of Car B. bnozlllsw +4u9mz8 01After 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 in +7,klz 8iztlifx pcam)f5 ,w+terval of thfli )c78,+z tzp5wk,fx+a lm ie acceleration?

  12.08: Through what distgm:mj 6k sr5;0*igf uaance does the object move during the time interval of the acceleratimsu;5 ajg:fir0 * gm6kon

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed lwjvw ej 5 )f8jo (cq*-zi,/;ogdbaj )from 6.0 o/c jb og ;qewjjd*jaz)(, vif-8)5lw0kg.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 p/f7 w9xrb8 .twq dbd7of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass ofp7/ 9tfrd 7bw.qxwdb 8 the crate

  94.38: A force F at an angle θ above orgeha3*)puvtx+/ ;b the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of a;+ughx p)/tvo rbe3 *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 foqc)fzzd- yr72 f4za79s 3vdxwrce and delivers a useful power output of 0.10 w to raise a block verticall -ycwdrdf4z2q asz z7)vfx937y 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 thkecp+/5 zppcl8s q-. y3ehc*xe: 1ffue 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 thehfqek5l:pc *+y-xcupz. ee/ 8f13cp s 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor ac-zt; / mdq4jelr :n3i4 zjor.nd 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 ai:o jrdrc3elt4-q.nmzz/ 4 ; jbove the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver9b 42vh- m: *uswjq162baooqlz gp3bu sees a barrier ahead. If the car takes 95 meters to come to rest, whatq2h svwb4pb69 jb 1q3louz a mo-u2:g* is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dowq c7(dctns2cp2) 5om zn uniformly until it stops. If the ball travels 15 meters, what was the average net 5 c)qs (ztc2pncd7om2 force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses buh7e.vha mp hbl)-i5/n t identical kinetic energies and the three following statements.lphme/ ibva)5 nhh.7- 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 vertic5 n 23ra1mjw67cm(ra xy+tggcally in the 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 highest ynx5w2cmga 3 7(1racj+6rg tm point?

  06.20: A boy jumps from rest straight upward from a 3pa*ljwncbamki .82-flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface wlbn3w. k-p8im a2a cj*ith 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 fr-aojbj l6c(u 9om aheightH above the ground. The object crashes into some soft uba j(l jc9o-6earth 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 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 obn:xocrfr,,)+oqx 2r s 5zqx1fject bounces off of a horizontal surface in a collision lasting time T. The object then ris,:+cf1zqn)r 2xfr5orxs , qxoes 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 until the copp8j9q s4rejgngh 0jc9+ j y4pd-tf))rd cg) )s g04jy phtq+pjd jnr99-pfe 8j4makes 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 inl-apjx4xcmvh) 3nw:0cline 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 stam3jla4 : -xp0vhnw x)crting 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 moveq e)0wljyw26 :vnsqkxs;1r0 as 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each cart:l 00w2vne16qs)aqx j ;wkysron 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 applied qo s 7oda+p/y r7cya1(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 ford 7pyo+q1y sc7(/aaorce F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fuzeqsj k4d+gb(iw1 p/ m4(/:oq gc:jkrom 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 the1du4ek ibcgsq+/:kjpw(jq 4/ g:o( mz mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an is,*yoc w hgxl y,y4)v,nitial 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 solgv wc*,y, ),yxsh y4peed 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 constaz1:z., efk xnj+,;w*dtdc j+rv+gmgcnt of 20 N/m. The zz:1cnj*j, +v d+kggc wx+m dtr,;f.epotential energy stored in the spring is:

  97.10: A compressed spring has 16 q zexgrovi,ni0 m, 9(.J of potential energy. What is the maximum speed it can impart to a g(0xn o9ivi.rem, zq,2.0-kg object ?

  

  10.31: An object of mass M starts frog ;4ck-zpt5t(s+ qlu vm 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 bl5tq ckv4z( g;u-+ plstock compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.