97.01: A force F directed at an angle of θ above the horizontal isw:(ryzvcj hk8qh+:sxu 3. 7 nj used to pull a crate a distance D ac j+chy3 xv7rzu: h8ksn:wq (.jross a level floor. The work done by the force F is

  97.33: A softball pla3b 85y/l nzqf hgtd 9)kpuup+,yer catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to re3pu n)fb h+u8lpq/9 zg tkyd5,st, 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 r8vnlj 45trtz3. ; -ez4 ulkdcsheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?k5 tl n4v4r3.lz- ecr t;dju8z

  17.11: A 5.00 kg block slides wlt vds (r*yo;gh1ei , brp ws3e901it5ith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stric9 s,y b( 1gpr;wetds1r5iv3i * ltho0etly 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 acbwl. toscp2 b *oc/1-eceleration on a horizontal surol -2. wt*b c/obspc1eface for 5.00 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 n+vlt/u39 wgy to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially aul/g v9 nyt+w3t 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 exerted on a w8 uc 0;utq;37trcx dch;d5zs3.0 kg block for 5.0 s. q chrzc8;;d7w ;3dsx tucu 0t5The block was 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 0k3o2/5syfozs fy ;wh throws a 1 kg hammer in one direction. 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 abovk 2h z0wf;ooyyss/5 3fe situation?

  03.14: A fan blows the air and gives s;boy y(ahcw y:8 6kpz.dur98/zr afgk-jv/8it kinetic energy. An hour after the fan has been fzkbh odz:u6 r88cv/s .y-rg w;(aa 8p/y9yjkturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg haa3jo*qvggt1 (v ch8b*(g de1 ws a position of 3.0 m, a speed of 4.0 m/s, and*ewa 1gt3 cdgboh(vqv(*j 18g 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 shelf in theu0hvcc g6 t .ub55rkmktlw1 6;m /u0x+uzw 5aj 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 d5jkc.0 a+wtkubg6 h umtuzm1; cl50u5xr/6wv o on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine deliverzz 6d8:cl d:es cv9si3s 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maicis e v:3slz 96z8d:dcntains 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 th)j24 +veysyri e 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 with2jvs4 ri) ey+y 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 botf;bddxry1 cf/3a:k2g q4vk rx4i t8+mtom of a rough42 ckd m /bdy:+tx4fvfa8 xk1grrq3i;, 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 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, jh 6*r3 43j lwzkpazv9along 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 inzh6wlk4 r *pv ajzj933 terms of B?

  12.07: What is the net force acting on the object during the times+/,8r mnmw2g 3r uefdz;2izpep lt-4 interval of the acceleratio3 28z f tz-glpei/+n2r mmsr e,p;ud4wn?

  12.08: Through what distance does the object move during the time intqgdrt d,+nr6 -erval of the accelerat+q -tdgndr, r6ion

  12.19: The magnitude of the linear momentum ofmg yzt bfq519tbu uy:7q8s r.1 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. Wh81fy1s:bt9b.7uq g t urmyq5zat is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while qly:r6nd*4 sdits speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass o :lqysrd46 nd*f the crate

  94.38: A force F at an angle θ above the horizon: regu)gh6+ia p8*zawtal is used to pull a heavy suitcase of weight mga)ga ei*8p: +uhawz6gr 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 exerts an upward force and delivers a6y/wjrceb3tf 9rvsj024w , y a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bler0rwwf/3y9j jcast,b64 2vyock?

  12.18: A 1.00 kg object is released from rest near the surface of the Earthbdu2 8 bdt dua),yc8,j, the gravitational force acting on the 1.00 kg object buj28ad yb t)dc,,d8uby 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 hard a t412n,fq um yajhsqm;bbjl41 8q -,zfloor and released. Assuming that the collisioy;hzb f8-1a 4 qmbq s2lnq1 j,ua,t4mjn 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 ba,( 981 w b-sulrya*oobjqv3az h.2hz frrier ahead. If the ca3sj1b hr,- qzvzw ao.u9hbay*f(28l or takes 95 meters to 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 slows db:bguq u hi *oj;u(4jue9w(h)own uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?:e g*u;9 (ub4uuj)wh (b oiqhj

  02.26: Consider two laboratory carts of different masses but idel;e(f5jehcw2 m(ocf +jc2)p xntical kinetic energies and the three following statements. Which fjco5e )( me( p2cl xhjc2wf;+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-kgballd-9qkuj -m p3t of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is tu3-m qtj9 kp-dhe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary conlcd*k1lv-s em - ,jh7r cr5r:xcrete 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 motion. How much physical work did 7 sj1*-r ,dc5lrhrc vxkl: e-mthe 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 3nz a0 p0nnzx/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/nazx nnp z030 average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from e,yx9h c e2kcc:uuxyum.i114 aheight H above the ground. The object bounces off iyh94e x2 u cu1: x1umy.ccke,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 3gl +i-8ngi/-km4 0wqutp l viL is pulled sideways until the cord makt8g-4wg-qlk/nlii iv0+um3 p es 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.z3kc p7;h mkk uniform incline 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 starting position and momentarily comes tokck. ;zh7 k3pm 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 from the sidewalk, along a 10-dbacnrnqxf(ez i (;90 7+w gg3meter ramp to a loading dock, w+da w(inq 9xz3(7 g0 c;ngfrbehich 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 shown in the figure) is applied for t3 npm l 0zmqvu:e.x7f;he 6.0 meter motion of the box upward along the incline. The massv ;0nq3.luepmm:7zf x 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 identical bowling balls A and B are efv m+48laii gva7 4;bgach 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 ag8gafmib7v4; vi l4+are the mechanical energies of the two balls changing?

  11.28: A person throws an b+-17g dosyoh 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 o- y1goshd+7 b0.5M 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 has a spring constant of 20 N/m. -mgp4m:feny ul3g)r7 The p )4f:gpnm3gl7r u-ym eotential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential e 0qu;iec5p+2 eo,rxxi nergy. What is the maximum speed it can impart to a 2.5,2c eer;q0 o ixpix+u0-kg object ?

  

  10.31: An object of mass M sta czduj0l :gw, +(l)k4v5zmwj 1 l fmje2vy0z/lrts 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 compare for the twom cf2wwz e1yl,zj ld+(00:4k5vzjllmuv/) jg trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.