97.01: A force F directed at an angle of θ above the horizont v/2lqld (aj+fk,.enj3 fo mc;al is used to pull a crate a distance D across / .nj3fjf vo(kc;qm 2ldal,+e a level floor. The work done by the force F is

  97.33: A softball player catches a ball of maspn e6dl5gw2mp w)d* if3hi.6ls m, which is moving toward her with horizontal speed v. Whidwew 5df63ii.2pm6l*g)lp hn le 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 sga(h 4gbr6ma 6heet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was e4ra6 ab g(6mghxpended on the wallboard?

  17.11: A 5.00 kg block slides with unifo( q7g*mk4gc torm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J ig c4k(m7o q*gtn 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 horichup9m3 ld566vm9yrx 8lb5drzontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 drp6rv 6h35 du8ly59xl9bcmm 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 righ9jow 0hft0gv, t is exerted on a 3.0 kg block for 5.0 s. The block wf 0gh,v0j9ow tas initially 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 exe ar7xd0a.y-3x +ch fjf pj1yi5 km)j5frted on a 3.0 kg block for 5.0 s. The block was initially atrj fa3cf) k jpxxyi51.y- dha+m f570j 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 fric 8c/tvg:oaf vmdy)xoc,fj:8) tionless frozen pond 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 above situatio) x,cvavy8cmfftg 8:o/ ) :odjn?

  03.14: A fan blows the a ;0cq,:lgcvu -xz f,tcir and gives it kinetic energy. An hour after the fan has been turned ;-,f,zcu :t cxvq gc0loff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0/b3/pnhhz 5.how8r kwd1. vf a m, a speed of 4.0 m/s, and an and8z3aw/1p..h5khv fh bor/w cceleration 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 ww q* -/:st3jn: yqzhjm from the floor. If the janitor relocates the box to the shelf that is 2.6 m from y:*qz j3 hjqw-stw/:nthe 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 horsepzg :r) ewn4c u-4c-dutower) of power to a car's driving wheels.et nrcu-uwz4gd 4)-c: 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 car?

  09.13: In the figure to the rjmg:yw .rht74 ight, 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 i4g hj.w7rymt :ncline 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 .1w)tt 6ersvb g2(iuyht, 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 i16er i.s(g 2ytvu tbw)ncline 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 travjd*kq6-: yvoqxp8u/1x lqt4zel to the right, each starting from rest, along a straight road. Carxp-u6q:zxvl 8j1 yo/q*k dt q4A 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 in terms of B?

  12.07: What is the net force acting on :ab)nk9j7 omm the object during the time interval of the accelerataok97 mj:m)nb ion?

  12.08: Through what distal0nul*-ecj8e ajpt l:( j*1vhnce does the object move during the time interval of the n *llea:*ljj(vcej81tp h-0u acceleration

  12.19: The magnitude of the lineujh d2(-g rvm9ar momentum of a 4.00 kg point mass is changed from 6.00kg.mmv( -r2 ujhg9d/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 interval?

  14.11: A crate gains 36.0 J of kinetic energy o-8 u;*evm2qn kfzs7y while its speed is increased from 2.00m/s to 4.00m/s. Wh f8mz7;k2evq* us -noyich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ abovnu+ qpi3ujd dj.nwa6).v w2s6e the horizontal is used to pull a heavy suitcase oau63sw j 6. dq.vn)2 +uwjndipf 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 by the frictional force is:

  14.31: A toy crane exerts an upward force and delk 3 0brtw0kb0bivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rb0b3tkrw0 0bk aise a 0.20 kg block?

  12.18: A 1.00 kg object is releai d3 3kki pp 19o* sul/yilsw7nc8ds/)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 /uc/plswi)osdy3dk 18l 3k 9ni*ip7 swork 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 motio2b6sq1c b:qd ukffrf-o0o(o2nless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, whichkb(2 u0 sq2d1 roc-6 qfo:ffob 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 barrier ahead. I( tt vbcxn. w5b22;ckqf the car takes 95 meters to come to rest, wt;xtvkw52 cb cb 2.qn(hat 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 unbq/5 g dd a;drc;f6*ertil it stops. If the ball travels 15 meters, what was the average net force applied while it was coming tocr;gedd;* rbq/ a6 fd5 a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic e-uz jvse -cc.(xwat 8(nergies and vz(jw8( cute-c-x.asthe 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 of clay is tossed vertically in the air wigru0akxoec2 jr7 ;y l (+uc1w-g-nl,p th an initial speed of 4.60 m/s.;cyn7-gl u r(xrej2c p1aw +g-0ok lu, 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 fr25ha h1yz6c/yng;kw+5x x sksom a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of g+ sy52wkhx; /n x51acy h6kzsmass 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 aheightH above the ground. k 7+grcw)3w-cr5 4dxc t- uotuThe 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 object while co5+ c rtrwdtc3k- g)c-4xuuow7ming to rest?

  12.48: An object of mass M is dropped from aheight H above the grounohjmlw;:q*;*jsft2 t , p7t mod. 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 collision with ,2mhom q *j7tl;pwjot*t;sf :the surface?

  96.38: A pendulum bob mass mon a cord length L is pulqa0ajjh t1v 8*led sideways until the cord makes an angl1* q8 tjjahv0ae
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 jiui-/7c91*/ t4b+*dovdj ct bh4fx mytjyi: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 moment9f4/jm j1 th7tbd yci/t -b*o y :icxvuji4d+*arily 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 r+x))mq5n*q r sjz+ar /p,6nz raahqk+amp to a loading dock, 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 daj+ *+)q5aq ak6h qx z nnps,/rmz+)rrock?

  12.16: A constant force F=50N (as shown in tu9/z xybc 2g4b vg lf9cr9t1t(he 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. Whi9u 9x( tlzfgbct4bgy/ 291crvch one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowl-qbx*ct5 7 gkiing balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second b5-q*ibk c7tx gefore 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 straight upward with an ini//2qc dx,r l4 vmhquumu4.:aitial non-zero speed v. The object rises to a maximum height H above the launch point. The person noix4 um/a4m q, d2:uqc /ulv.hrw 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 sne./ lf gdi;;zvb9io1 tretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spfliz/g;.9 ;oveidnb 1 ring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxim n-+rn5whse)*p d,+nu2m n: .u ytcdubum speed it can impart to a 2.0-kg obn-r+u2 +syndhn p* bnem t5d),uwu.c:ject ?

  

  10.31: An object of mass M starts from rest at the bottom of a fix w;s*a sk -1zq6ea +8aq. x8moppkbxb)ed 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 f*ab)b8za 1xe px.+k; so86wqk msaq-por the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.