97.01: A force F directed at an angle of θ above the hori7 s txh/n9izoraf*c(*j5q 2vmzontal is used to pull a crate a distance D across a level fsnjfz(ahoi*xmct*2r7q/ 95vloor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is-we1y9v2g8ixa -mnbdnpfz 69 :pxb8 y moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming:yxy- bw1ngf-x9am 9z8ppn8bdie62 v constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet offnt kc3eaev*. flt2q) y .2a2o wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard? qkeya .v)o2a2.* 2t ftlfc3en

  17.11: A 5.00 kg blok2 irft*5e,pi y- hcw12m (xijck slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 ikctyi,2epxj 1 5-f w(m2*hriJ in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bloc1 ch prd/w*kk-(yq4 trk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time. ch-rw yq pk4/ktdr*1(
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 righ(ow(5yc3oa5caf mnl : 9lkd6tt is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on lw 3((myc5nlad f ta 6ckoo95: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 3.0 kg 4 xkdmq(wyk9g;x(r;c aay1) hblock for 5.0 s. The block was initially at (4y)xc1qmd ; kg yx(ka9 rah;wrest 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 pon3 sd-tl.b,yhm d throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directioyl-hmbt3. s, dn while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after po:;qgph-7o a:n8 8a9gwphe d the fan has been turned offe9g pa; 878oo- dnpgh awq::hp,
what has happened to the kinetic energy of the air?

  09.05: At an instant;e o:) ddjpm9//ciqqg , a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and pqc edd/o mj/;ig:) 9qan 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 ztgzdej-y)webjgxj) * .)p 5 ,the 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 do on the box. T),jgexej). y*5)twj z g-bpzdhe box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wati2qa (jydd(s/+f j1 hl,z nct1ts (about 32 horsepower) 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 the retarding force acting on the carifz1y j,d+(1 l2/(a hctdqjns?

  09.13: In the figure to the right, a box moves wi)-byb;xcb7f; m9vkgc6veiz9 th speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration-fyxz v96bve; ;7kg b)c c9bim 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 gj,za;; wf:s zright, 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 ; ,gzfw:jsa;z 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 r+w:,44b3j zaspj yb wrest, along 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 travelej y:3s4bp,brwjwa4z+ d the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on thytq b/y; )q-vne object during the time interval of the accebyn- yq; qv/)tleration?

  12.08: Through what disecunkbl) ay;. k)-fd8b ;iai1io8i+ytance does the object move during the time interval of the acceleratia fyb)i8- i ;8kd.yeiibk);n1 la+oucon

  12.19: The magnitude of the linear momentum h (0rkvmfm1 r,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 the kinetic energy of the mass during this time inte0rk1( hfm m,rvrval?

  14.11: A crate gains 36.0 J of kinetic energy while its speee - cb 1qm+pfg1f (cgvo s*fudbr/b*)4d is increased from 2.00m/s to 4.00m/s. Which one of thc f su+r(1pobd4e m-gbb1q)v/*ff* gce following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horicv gei0bf*0fmc0 3;sgt nhfu7.hd:c( zontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of fricccdf3gvbgf c st0.7e m0 hni u*(h0;:ftion between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an u6to+go+nb 8w,hx+;ic w, -u,ajkgf o hpward force and delivers 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 6bau,gwjn+i kxf+ o, ,to8 o+;ghhc-wkg block?

  12.18: A 1.00 kg object is released from rest near the surface a 8 pfzq 5;*rfxch3)koof the Earth, the gravitational force acting on the 1.00 kg object by the Earth do5z8c;f)a x*3ohpqk fres 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 motionlesssc6 s3(q3u8l .cnmox s a height ho above a hard floor and released. Assumincoqsl3c3(s8 ns.6m xug 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. They)m 6;;uiiqmf driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the )iiqum;;f6y m minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until i-2vuts bwi w.x4 t7yb9t stops. If the ball travels 15 meters, what was the average net force applied whitsvi-y x tbw7 w92bu.4le it was coming to a stop?

  02.26: Consider two laboratory carts of diff()j do9onax *.y;qvwi 28vp huerent masses but identical kinetic energies and the three following statements. Which of the above stp h)q9 yuiw.ja(ond;vv * 28xoatements 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 clayuie-t: d e4hm, is tossed vertically 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 reachem ede,hiu-4t:s its highest point?

  06.20: A boy jumps from rest stk-30hajj 4atzak0 d6 sraight upward from a flat, stationary concrete 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 ph0a0da-a 6t ksk 34hzjjysical 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 dropjn k27 uv9ao5gped 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 tho2v 5j7kua9g ne 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 n/1eh6r ifz /nuu.vlh :ukg5-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/2. What was the magnitude of the average net force acting on the mass during the colliuh5vn-uuefkh/ z n1g6 l/ri:.sion with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until tf * k0q8 fi,l oo9;pq8.y*c jcbps8qfghe cord makes an angsqfi *of89 cc k8f* l;j.8 py0qbgqop,le
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 ang3dnq3 79vgo 7rtu91 m g-iqfpgle. 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 startqrmgodni f p39q-u vt 193g7g7ing 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 the sidewalk, along a 10-meter rahg,cms 3b a2psgv m441mp to a loading dock, which is 1.5 meters abog2bpmm4av,1s hsg3c4ve 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 the 6.0 qi6plo;u(.n/njwt e- meter motion of the box upwaro/j-;.t n(w6i neuplq d 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 onthe box for the motion?

  04.48: Two identical bowlgb(: lf9tdov.ce yd(z/v+gb /ing balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one :oz+bd9e y/ggvlt( c(bf.v d /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 object of mass M strpp;p )5-fh9oaaxvj 5 daight 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 la a-f5 )xj;9v5d oppphaunch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring cf xbn5 c84fqh0 (r7ex3 rb4ostonstant of 20 N/m. The potential energy stored i (r45tnebb7s0xof 83f x4hrqcn the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the 2q6pvyxn) n0bi n 05ermaximum speqer0n bv n605)yxipn2ed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom01qvzlk*b4 p ,5ih5nvtjtt. u 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 inptinh 1uvj4*t tv0z,b. 5lq5k 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.