97.01: A force F directed at an angle of θ above theaz3r e:8zo -mg horizontal is used to pul3zm8eg oz :ra-l a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player clpg .zsl 2syqo8+g vh8 x-q f0m)./gojatches a ball of mass m, which is moving toward her wig0/+v8qp2mo) fls ozsx8gl.h.q-jyg th 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 by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboardybrw+iz 3aep-6 ue9e1 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex-i 9a uyzw3re p1+ee6bpended on the wallboard?

  17.11: A 5.00 kg pf3ebhjen7 +j4c5.gdp sla) 3block slides with uniform acceleration on a horizontal surface for 5.00 s. .pph4+cb n5ge7ed )3 lfsajj3The 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 slo;cxws isoe-*e r9en)f+*o3b ides with uniform acceleration on a horizontal surface for 5.00- 3cw bo*s)sf+; * x9enroieeo 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 eml :5y;zpmb +hxerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides onm +lhm5z:y bp; 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 i,)w*rgf8 ajs qs exerted on a 3.0 kg block for 5.0 s. The block wa8*,g)afjw rq ss 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 qrb 8 korz t8n0bla*)6at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the studentt bk*lo 6rnzb)qa880r moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the aiqxc qfp6 hf (4sj(-k66,nfig cr and gives it kinetic energy. An hour after the fan has been turned off,6f6nfij (6cgqpqcks ,f(x4h-
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of ma.jv.c; otjwv4ss 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerativc4v..wtoj; jon 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 the,/ cf5* lfc08x lpgzco bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6ff*c cp ,gloz85lx0/c m 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 watty8wt n**a4m8vvd 1c; *r abgqns (about 32 horsepower) of power to a car's driving wheels. If the car maintains a con w*gma8c nv t b;vy14rn*da8q*stant 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 movn49dx*ej: r xses 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 inclixxnj:d*es4 9rne 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 boxd ap ;gq+o8t-e 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 iqod-te;+ p8a gt 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 right, each starting from rest, along a strab sldp w.jto(dr.52co ,p8p/j ight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled tl/ojpdps. 8,rtc(db2 j. p w5ohe same distance F, what is its speed in terms of B?

  12.07: What is the nu4 gwcxkonfs(5 u+cp.3yq:q-et force acting on the object during the time interval of thfuysx5.u wpccn4-q (kgo+:q3e acceleration?

  12.08: Through what distance does the object movj /qu5rb9v;h me during the time interval of the au h;5r9m/j bqvcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed +h60ej-cs+hc,a obfm ye p1g4 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 this time intervalc gye1-0esohh b6f+a +mp,4cj ?

  14.11: A crate gains 36.0 J of kinetic e udxt673-ro rhnergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following hr-xr d3 67uotchoices best represents the mass of the crate

  94.38: A force F at an angle θ above 9us8)jxr 8qn1uyz9ndthe horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the d un1)yuzr8j9qns8 9x floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delil0cv.j*i9qm* a +zkrhvers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crankh ali j*q0 cv.rm9+z*e raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest3 ju+vkw8z4 vsyec9j n dr)(4s near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Ea(v4u39y r k c )jsvsj4wz+ne8drth 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 a8p2n )o dlvv(ktwbk4 c:1rw n4bove a hard floor and released. Assum okvrn 1wndp 8t24wk(v4c:l)bing 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 above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrierc ul r wf6kkog/a51(k0 ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average wkr k5gf1/ k6cal0 uo(net force necessary to stop?

  00.26: A 500-gram ball r:+ nqotl z5 cez/ c4tq9qe;3julc.(hmoving at 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 stop;cl z jn que5oler/qt9cq3z:t .+hc(4?

  02.26: Consider two laboratory carts of different masses but imo(d d3j3 0b;/jg;qjk n3vvlkdentical kinetic energies and the three following statements. Which of the above statements wovlvd3m;(kj /;j3o 3gd 0kqbn juld 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 odbsu 42z0w)49ww h b2.gcsq cgded;q4f clay is tossed vertically in the air with an initial spesg eb )zd; c490hq4cw2g4w.dud2w bqs ed of 4.60 m/s. Ignoring air resistance, what is 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 conkjowxfh )j3 *+crete surface. 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 mo*x3w jjfk)+hotion. 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 above7:abhq* 3w9guli)aap 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 *3ap: hag9uqalb7w)i 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 groundvbv;m * 1shr y1chqsr tr(x9r5(h+dq 8. 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 force acting on the ( 18r 5hsrdxthmvcq1qsby ;9(h+r*vrmass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulle a)7fsy,styhi226y uq ,gw .lad sideways until the cord makes an awy), , h7gtyy i6 qsf.l2saa2ungle
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 oflytn;f+; w d0g 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 y;g;n0fwl td +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 cartons frdxmpq biot1k /-.2rt4 om the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a maqb t1rkd2.i-o4t xpm/ss 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 rtozlm9) u+3aF=50N (as shown 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 o9 a)zu3otl+mr nthe box for the motion?

  04.48: Two identical bowling balls A and B ,8yl:t 7qa m9kkn7lmoare each dropped from rest from the top of a tall tower. Ball A is dropped onlq9amm,k7t l: 8ny 7oke 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 throwsfdcs ;ww/;s wvu6b 02.rekv;w an object of mass M straight upward with an initial non-zero speed v. The objev;ww/c0w;. b ukds v2rwf6; sect 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 spring that hwst b* d4ux;k 8ypcox,(u42:tdgyh o2 as a spring constant of 20 N/m. The potential energy stored inu wyt2 ds8 o42h(kbuctxp*oxgdy, :;4 the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the max+cm 6o3/lup;- w wl+ zlmu:jkoimum speed it can impar/+j;uplw:ow6m + c-lzumko3l t to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bott6g-z 0xfs f sdoydz.p4b 3;dp-om 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 compare for py3ds 4bd6-fsf ;xgpd.0o- zzthe two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.