97.01: A force F directed at an angle of θ a-n;8svm oa+c+g m4ynabove the horizontal is used to pull a crat n;osmn+ ymc4+va a8-ge 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 )n. +/p rcfw :m9ejbqcmoving toward her withmqp .e/nr+f)9jbc w:c 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 o df55b6 f4wbii:5(ojz fxpe 4wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much powe:55zd ew4bjfff54oi( ix pb o6r was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform a5dsenj.js v +jv(i9pf7 e .pe-;y lv+hcceleration on a horizontal surface for 5.00 d+(jen j-s .v+vpsj. elie5;7v9yfph s. The 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 slides with uniform acceleration on a 6mpu qk15v7dc horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to k17d mp q6cvu520.0 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 righte3r t,:dsd xz2 is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a h,re dsx32t :dzorizontal 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 righy dumv -5lvml55q psu b25dik80mm+ 0ft is exerted on a 3.0 kg block for 5.0 s. The block i u8v lufydpm25v0505l5skqmm- +mdb 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 throws a swrwkv+k te8hff-/5f6hjp, / iux 5 8y1 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 above situatiopj /hf+w5keuvf-sk/8hf r iw6y 58 t,xn?

  03.14: A fan blows the air and gives i utvw e* jq5mmc.rz a16n-6r5savx 9a)t kinetic energy. An hour after the fan has been turned off,)v 5a aut m-rrvx1ze9*ac.m5 nq6wj6s
what has happened to the kinetic energy of the air?

  09.05: At an instant,mm2h g3jtszt6w; b)*s a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerationmtj;3* h 2g6bmsswzt) 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 1.3 m fr6:zv yh )xxnix-s/o5ui/5vr l3,l hywom the floor.vs6-wr hxiuhyy/z/xv n 5:) x i,ll5o3 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsep7w8gazag). nve 7+x0gnij1ihlr)e*yower) of power to a car's driving wheels. If the car maintains a w) aixz+ elggv8nri eg1y7*0naj ).7hconstant 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 wz(x ek.xvoc l*i5+c+ujy i*5rv,u(gmoves with speed 5.00 m/s at the bottom of a rough, fjc+x .y*ul 5vx v(oi5(w,u ir*zg+eckixed 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 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 rig;g juz fv0b4rqn , iuu,9b/xa6*xjs:xht, a box 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 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 j9*nb ivfusjaxg ;0u,: x b6zrqux4/, 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 sta.+2+x rr. gmrocr oap(rting from rest, along a straight road. CarA has twice the acceleration of Car B. After tra o(++cr2am.r rpo.xg rveling 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 tjxyrq a98 k.un)pf n86 auh1.bime interval of t98u p nhaq1y.8r6.b xaf)jkunhe acceleration?

  12.08: Through what distance does cv s om5x1/ g(0rs/l z1usynm:we( nz2the object move during the time interval of the agezx/5n m/w((1umrn lc:z o1yss s02vcceleration

  12.19: The magnitude of the linear momp5p vs5 a5z3saentum 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 ch55az pp 3s5vsaange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of ki qcx *)zfinzaok)73r2 kna8 f0netic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of 3i kzx*kn2 cf) 0)ozafa8 qnr7the crate

  94.38: A force F at an angle θ above thc5fqvq7e1wman 5d ; t1e 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 floor and th etwdm a1f5q7v5cq 1n;e suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usey t2 h/(hwto1iful power output of 0.10 w to rhyo2( t1iwht/ aise 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 obje lc5 thq)2fyw )v2c*uuct is released from rest near the surface of the Earth, the gravitationalvt l)*5h w2 fcuqycu2) 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 the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and z( sm kn)sawas6 8if-;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)aia (zms 6 sfk8s-;wn 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 barriemj6(sfnob 71mhoml 5b-/+ fml )- edyrr ahead. If the car takes 95 meter f6(e1y+b- m-roj lld7omhm/s)5 fbnms to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball,uj e08eb: flk moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the averag b:f08ek,lue je net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of k1c :ph hun2i amq*-w,different masses but identical kinetic energies and the three kqc:hp-inw2u,1 hma* 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 of clay is yb6l9j 79 k+ku2hwd92 ljyvps tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring aky67jhjk 9yu swv99+2p ll b2dir 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 concrete se cc iehx7x1n/1)1hn-m nv9rvurface. 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. h hi-nvn911 nx/r7)cc 1ve xme 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 ijb7t sn2 si fmy90trdrqb2844 s dropped 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 exerted by the ground on the objny j 2dt rb4r7sqt04b28 f9simect while coming to rest?

  12.48: An object of mass M is dropj bzgoea((q d4z h)cln j-9l2,ped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2a,nz4(d2hlc(egj )jlzqo -9b. 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 dljw xc0 -(6ogqlngz58nl ef 6y*ps1*the cord makes6- f jn86dp1lqg*g o5lsy(l xenc*0 wz 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 sled, w0fi jbdv)+pt u)k*n+p hich started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.3i)0k* puf++ vb tj)pnd0 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 the hill?

  06.09: A deliveryman moves 10 cartons from td2zthq6 : h lci--u l7magxe2/( dtgy8he sidewalk, along a 10-meter ramp to a loading docht-cagxum8 /ld2lq2d -6hy gi:7et( zk, which 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 fig- dgs/g7dko /24fowx r 1 98tewl7ota 1qd-zxhure) 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 repre dltq2akr x 41ws87/ odgfg-/-z 9too1hdw7exsents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each )m-br0n2v7hbc c qnh 1dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B-)nh0mc1vh2r qcn b b7 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 object l :(fnfgk n;,tof 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 the object of mass 0.5M rise above the launch point? Ignore akgffn, nl(;t:ir resistance.

  96.20: A force of 10 N stretchoj6vx9 1vtqkq.qt1y7 es a spring that has a spring constant of 20 N/m. The potential energy stored in1qoxkqv 9t vqjt 67.1y the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is thf;kw vp (oo,9di rlj*5zxu4,8wksb :we maximum speed it can impart to a 2.0-kg objkw,s5zjopd: *kilbfxww4u;,r8(ov 9ect ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed )hffyhb6w mvsgq* ,;- zy h4m1incline of height H. A person decides to push the object up the incline in one of two ways with an appliedfymz1y* h qf;gh)4 -,v6 whmbs 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 two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.