97.01: A force F directed at an angle of θ above the horizontal isab)j*+e o ye1 le(7pfcl/yn7p used to pull eay e(of7 +7pn1)jl*y/cpl eba crate a distance D across a 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 wi2lk-vwrh c1u5 h.tg8 xth horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assum 1vkwg h rh5tl.x8uc2-ing constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard a86 po4i-kq6ee.: xkyy w*kwk 3 meter above the floor for 4 sec-e8okqw:k ika yew. *66yk x4ponds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horiz f* cc2i3zjn*yybf 80+hz muv.ontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J ty*c m h0v.z cn *y+8ufj3zb2ifo 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 akhs2(nqpz)) t horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20s(zq) 2kpnh)t.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 righle/z b/ 5huiu+t is exerted on a 3.0 kg block for 5.0 s. The block was initiue u+/h/ zl5bially 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 directed to the right is exerted61tlpimp c2lrt f-b(5 on a 3.0 kg block for 5.0 s. tfcl(ib-lrtp 6m215 pThe 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 frouxgez507 is) b2u)ysqzen pond throws a 1 kg hammer in one direction. After the the zg57) 20)usbs yuqixrow, the hammer moves 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 airu+,d vrco9p y4 and gives it kinetic energy. An hour after the fan has od r,+vc9ypu4been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant,j co.f,4:fc vk a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratiok.j:4fc ofvc ,n 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 bookroom 1.3rq,,cnk:jr syk+ 25xb m from the floor. If the janitor relo rjq2s ,bn,xck+y :kr5cates 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower)osnle ejw .8-0*7 bvlm 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 tnws-v*b7e8l. e mj0olhe 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 bottsl5a o3 2zlw0z+7wi d7fvzzy:om 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 a speed of 2.50 m/swhen it reachvzwyz7z: lai5wdof 70zl+s2 3 es 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 l6;q b mxtp:,k)ap 3ks,o8iif 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 it is being pushed directly to the left with a constant foxptf) p8:iqs3ia ,,k; k6 mbolrce 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 straight rl +o)*+byv etbx w3cr9tj40a xoad. CarA has twice the acceleration of Car B. After traveling a distance F, Cab49 x+ xaeb)j lr3*votyw0tc +r 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 interva ngsi8ik3p2u0 l of the sn0 p28iik gu3acceleration?

  12.08: Through what distance dyee8hl 3vk3 ni3wi v2(oes the object move during the time interval of the ace h2(i 3i8e3ykl nwvv3celeration

  12.19: The magnitude o7)qd53 b e0lvkjy4gtz f the linear momentum of 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. What is the change in 0g547 j3tdbvzy)ekl qthe kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spbsnlrf-+h;,z u a/)vpeed is increased from 2.-u;+ z h)bl,sfvn ra/p00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy su6kz; a78q6odpx pco/6hdx n 0kitcase of 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 kzq6/n p670oxoh; 8 akc6dx pdby the frictional force is:

  14.31: A toy crane exerts anii 1h.t pi8vv v/7ekv.8ly:l r upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant.i.irlv/ 7kpvhev8v:ly1ti8 speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releakx;wlyhu1 - (/ ttuip(sed from rest near the surface 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 r h uktu;t i/x(l(ywp-1epresents 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 balbf; g6,l3 fank;j8yx tl is held motionless a height ho above a hard floor and released. Assuming that the cok ,a3 nxj;gff8;ly 6tbllision 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 mtulfb+69h-1xmh q b- ;nuz)e- d4 xqkp/s. The driver sees a barrier ahead. If the car takes 95 meters to come to restbmhhzbuux-ql ep+6 4 )-kt 1fdqn-9;x , 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 down uniformly .zpok,4ms xqboq7ze4ax59k:0 f1bsq until it stops. If the ball travels 15 meters, what was the average net force applied while it w:9, 0bo7.e q k51 sb4mp fokzsxazq4qxas coming to a stop?

  02.26: Consider two laboratory carts of different mdx6 p81x)/kqkwz mk 7zasses but identical kinetic ener7zk q wm6)/ d8k1xkpzxgies and the 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 vo2 d1x :ak1ayof clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in xva :yd 1k2a1oits potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigh0ta 4gkcaeg47 * ;rvwuz9k ej9t upward from a flat, stationary concrete surface. The boy, of mass ;c0wtg 474 jke9aa v 9*geurzkM, 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 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 ahl68t x*e oic n/jn ahz9ee.y42eightH above the ground. The object crashes into some soft earth and comes to rest by i2 98axc/eth.nlo6 en4*zje ycompressing 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 grountp4pqld 0to9xa2b.q b z+h;wfw4iz*2d. 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 mass during +;oz f4p4i0t 2t9awhlp q q2.*bwzb xdthe collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until thc-y7cp9u- tfx2j 1blqe cord m b9 cl1xq7cyu-2-ptjfakes 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 incline of unknown angle. The 8k icp fyhy4(f+.k1x,rxcd/y 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 momentarilrkcxdcf (yhx4 .ikyp8f y+/1 ,y 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 from the side- :fimzx-9l rxwalk, along a 10-meter ramp to a loading dock, which is 1.5 me-9xl :i-xzmf rters 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 showo bsfj)w2;zz7,sqw9 z n 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 forceo2wbzzzsjf9, )qw 7; s F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped kfbxzz.swgkc-2 r (jpv7 *f, -from rest from the topp xzc(g *,zw-.v-j7bfk rk2fs 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 the mechanical energies of the two balls changing?

  11.28: A person throws an d k2(vyv6cpdggk0 fq3.)/ fy)o )eaioobject 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 upward with initial speed 2v. In terms of H, to what maximum height does thf0)op(afvdye.2 koycv/6gg))dk q i3e 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.rkccxuukua6 (f e ) ix9l) 4dn;26z)vp The potential energy st ux6av k(kz if6 x nclp9)rd)uuc42);eored in the spring is:

  97.10: A compressed spring haxg.e -ymz7s8+b : 7iqsq-(ip)cxvg p gs 16 J of potential energy. What is the maximum speed it can impart to a 2.0-qp-xgipzmx77g ()8.qb +cvsg ie:ys -kg object ?

  

  10.31: An object of mass M sqz,, b f jdz6o8i;oun. ii09pxtarts 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 done8f 0bu9 xjp.6iizq odz;,in,o 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.