97.01: A force F directed at an ang z-(isr z-k/jile of θ above the horizontal is used to pull i-zkizs -j r/(a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball catnipz ;5ucw+( 2cu wi7g4 -tof mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, c cnwut +tw p5a(u;z27-cgii4the horizontal force exerted on the ball by her hand is

  99.14: A construction laborex-7.gzml*e ys r holds a 20 kilogram sheet of wallboard 3 meter above the*7xl szeg. -my floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slid-k3() h5 d,cljw wyuxdes 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 tk j)5xw -w c3ldud(,hyhis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides;kvka c): ;tno with uniform acceleration on a horizontal surface for 5.00 s. knv: k;)c; taoThe 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 to the right is exer dheya )-hp8(eted on a 3.0 kg block for 5.0 s. The block was -) 8eyhh eadp(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 exerted on a 3.0 kg bloc.3e5rqlbjgux5it kx) ig2x4 9k for 5.0 s. The 954x.teu r ib5gkqjx3)ig x2 lblock 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 froz p:anqor5k9;m en 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 th:onr am5k q9p;e following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic- n+s3edlgf -)vhzvx9 energy. An hour after the fan has been turned off)3n- leszvf+h -gxv9d ,
what has happened to the kinetic energy of the air?

  09.05: At an instantjxvuw 2(otp(*6e a- aw, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelert2xa6wovaewp(* uj (- ation 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 bookroomu.poe-q( ml g :/:ivzo 1.3 m from the floor. If the janitor relocates the box to the slq(mopi uo: z/- .eg:vhelf 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 -o cshbd/.s4 edelivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/scd.4 hos-/b se (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 speq41 adh 0rdi3fed 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 ofF = 2fiqd0h43 1ad r40N. 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 d,3n qu9s+yeu 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 mu9syn eu3,d q+/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 :zrla7 b ;)pzsroad. CarA has twice the acceleration of Car B. After traveling a distance F,z p b:)r7;slza 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 th8izjn(mk/yh dt2z(,u e time interval of thy,in(d k/z2 j ut(hzm8e acceleration?

  12.08: Through what distance does the object move during the time interva 0obnb2 h,mc-bxc9 6krl of the acceb6n,r bh9 cko-m bxc02leration

  12.19: The magnitude of the linear a 2v6yebe akn;c6 9c:amomentum 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:aa c n;ye6 vck2eb9a6 interval?

  14.11: A crate gains 36.0 J of kiv p3:m m bhr9g3f5m/sjnetic energy while its speed is increased from 2.00m/s to 4.00m j3 bfmv3ghr:m95p/ms/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 hhx2: /mt paga :b.k2 g.zex1jw6md: pheavy suitcase of weight gapm. xpdxemha1::b.2kwh:g/z j6t2 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 delif6x:biieqftj-f0/ r- vers a useful power output of 0.10 w to rais-bjf0if-/ fe x:r6 qtie 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 object is released from rest nearr5bb,(b vm g27.vr bti 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 represents the amount of work donemvg,r bbvtb25r(i7 .b by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionlesuglp(ibrxb1c84lzd0 c 1 ,u9w eplw7a50/omz s a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs b( gld0cl z l9bzub p/cp8wo1rx5 i14 u,0eaw7mest 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 btsy9tv.uaq mc q,4 0w cmg9+r.arrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary tcg.0m qv yuw9as t 9cm+,rq4.to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly untz/v,j9rc1*a.-ne* dd/pr- lek jzhly il it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a nj r -d lcj.kay1/*l9*evz-r de,/hz pstop?

  02.26: Consider two ln kz0c7ds.+cr6bi3n v aboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would b rc+si37vz d0nkc. nb6e 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 with an initig c35e* qrnhl7nmr1he /b /mf6al speed of 4.60 m/s. Ignoring air resistance, wnleq g1 * /63menrrh/fmb5c h7hat is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest st5d79jcs/:zf/ rav 6s d om+fplraight 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 physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the bo+p//ss7v5ma ddfcr l:z 6j 9foy?

  02.48: An object of mass M gaa8rt //a .fk)+ mprf2ahxtm -fmp) /is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance om)p rg.8)-at fa/h rm/ 2t fx/famap+kf 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 d+ gksk f94hk z.- n84xskkl-aground. 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 thk- khgkfl8kx49z+dsna . k s-4e magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bo7 u7vatr8b8wx94w qhjb mass mon a cord length L is pulled sideways until the cord makes an angle x7 48u hjvww b9a7tqr8
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 incl1bs1segxpxbxw.+hri40 da 8xr9qn; 1 ine 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 to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its bs1a.exi +snb9w1 xd 04 qhg 18xrx;rporiginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 carton7*6fbqwkq) gxs from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sgk)fb7 wqq6 x*idewalk. 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 forcewn( ruet4(m ywn :x2*j F=50N (as shown in the figure) is applied for the 6.0 meter motion of the mwt4 nrjw n :2(x(y*uebox 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 force F onthe box for the motion?

  04.48: Two identical bowling balrhr a qamro/6v.lf* 08ls A and B are each 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 are the mechanical r/.fhqaor*rva 6m80 l energies of the two balls changing?

  11.28: A person throws an o7 d. otooa2*nsbject of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch ps.oo2n 7*toad oint. 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 air resistance.

  96.20: A force of 10 N stretches a springf d- y,av9 ab41tgo7ns that has a spring constant of 20 N/m. vy1nob4fa9d-a , 7sgt The potential energy stored in the spring is:

  97.10: A compressed spring ha*; v6ksol/ r5e zx/j:lwxl+xqs 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg objx5k xl l;6 :rsj/el/qovz+*wxect ?

  

  10.31: An object of mass M starts from rest anvl;i ww.. or(t 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 two trials? Assume the same constant non- . onvwr .i(w;lzero coefficient of kinetic friction between the incline and the object for both trials.