97.01: A force F directed at an angle of θ above the horizontal is uhy/.( kf:gtnni)6 g.m p i,ivk+k3h nhsed to pull 3n/,knh if k:h+.(i gvitn)ygm.hp 6ka crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a*lakotc l+p1d. x 3b9a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dtoakcx ldb3.+9*1plaistanced. 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 wallboard 3 meter aboy5rb ,yd*,fp1w1btbslbi ;m0 ve the floor for 4 seconds. During these 4 secondshow much power 0*bw,mb ,psd;5tblbfr iy 1y1was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hori nakdvj6yk8 f:.-td1p zontal surface for 5.00 s. The block’da.1ktdyp :j68knv- fs 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 unifo3) 8quyq(sofe fz sq29rm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasq)3fqzq29( fu8oyesses 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 t8t qxu5ogy 7rd/z e mmpve*48)o the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a ho5 8 uy/e*mxp q 7vz8o4grdetm)rizontal 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 22cyfh9zu/,yb(hv1g1k5og d j iu; pk 3.0 kg block for 5.0 s. The block was initially at rest an 1(fuhcv1iyg,;2jh k5by/ zop2d gu9kd 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 frictionlsc1-1wvfw96t0;h.lsi ft cy1 bw j,k u xxwz58ess 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 foll6bc1-t1ty ;wiwl wjss9u,h 5f1fz 0 x.kxc8v wowing correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after t9l4bvw okqf/7zl /drswve+ z/ gv6z9;he fan has been turned offzb+z9 k;/ws gw7/6oldqvv 4f9rz v/ le,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h7pzhl r .gy6+has a position of 3.0 m, a speed of 4.0 m/s, and az. g hlrhyp6+7n 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 the bookroogkuwpp7 j*6 b+m 1.3 m from the floor. If the janitor relo6jg7pkw* p+bucates 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 ho)ulhs:/n czske . 4 )yvjv6z;t2ron2xrsepower) of power to a car's driving wheels. If the car maintains a constant speed of)4z vujyxt./cvz):n2kss r6 ohlne2 ; 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure tox +3 qn, mw7oruc8-a2ucknn/gw2mh8t the right, 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 forc2 nnkgwtu 2 xh/ocum 8wm cn7,a8+q3-re 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 right, a box move 0z 20gzzt/zztw q0n g(54bb8sz n5coys 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 ttt8 cwnngz0z05bos(z2 b yq z40z/g5zhe 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 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 startinj * -ln2j :mw(uqlwdn)g from rest, along a straight road. CarA has twice the acceleration ofq2n()m -nd*wj u l:wjl 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 the object during the time interval of t7d2a 4tgw ns,e)j)ics he acceleratioew2 7cat, d4 js))nigsn?

  12.08: Through what distance does the ksuci28i-*-/lmy :dasbh z 37w 9bk5kcw v+qv object move during the time interval of the ai*vuka z s-5+ychcq swkkvbdi3 lm29-b:/ 7w8cceleration

  12.19: The magnitude 3c yj;d*uuoks5dkeue3z6.:k of 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 the kinetic energy of the mass durinu: ju5;3. 3ds*oky6uezd kcekg this time interval?

  14.11: A crate gains 36.0 J of kineti17k li 7 :cusp6vsnp,cc energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents t nvl7:s71iu6pcscp k ,he mass of the crate

  94.38: A force F at an a+n.x-npw*p wdngle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction bet-w*.x pw+ndnp ween 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 delivers a useyu)go qy -i)z0ful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane qy yzugo))i- 0raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the k:h s(q7qy yyu7l6(kgEarth, 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 bes(6(lug:yysqq7k y k7ht 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 motionrppaza9ok l,i9, i.,0 vyi d7y;ebkk +less a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the followe+ ,;iy,.0pk,9o ai9kyvi7 krp l zabding 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 *h :kf ghy6ysinj )nv -ff*b6328 m/s. The driver sees a barrier ahead. If the cnvf*i 6 y:3-n*hhbfj )kyf sg6ar takes 95 meters to come to rest, 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 dn nbellbwpk:13r6 )f2own uniformly until it stops. If the balb bnr 3)l2:epkfw 6ln1l travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory car0*xh tqiy9j)r ts of different masses but identical kinetic energies and the three following statements. Which of the above star )ythxi*0 qj9tements 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 a0 boc2nzc3 p,nir with an initial spe2onb3c c p0,zned of 4.60 m/s. 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 fbxt9sin k- l/k) vad/t(y:e/j rom 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 jb:nali- (/ /ktt 9xyvd/esk) 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. The objezeqgtsjk):5w: vfx95u- z h0v ct crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming t9:z05vf h5xzgk usq- j wv:)tehat 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 gkz zmitev;p+qg2m2 00 y0 s h)fqg+*rM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object thhy0 gqivpe rfmq)g2t0 2msz;*+ g+z0 ken 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 the surface?

  96.38: A pendulum bob massrgdas( td.o g40wl7/(xwrjc/e x z-t , mon a cord length L is pulled sideways until the cord makes an an /0dt 4a(gw/7 e xsjtox,g(-.crzdlwr gle
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 incl)vmgfq4)jad 0/rdprxp,7 r6hine 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 imd, prfvx)g dj/r 4qarp 67)h0ts 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 cas/9( gnqkw;jd rtons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters abg s/j9nk d(w;qove 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 sh :afcwqv q y))a*xjw7*own 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 workvaj )a)xw qc :q*7f*wy done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and g 0j/n.q fvs,p3e- xitB 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 energies of the two balls 3n i -ftg/.p0jeqxv,s changing?

  11.28: A person throws an object of mass M strai sg:uoppv;-+ kght upward with an initial non-zero speed v. The object riseps u+;k:pgvo -s 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 air resistance.

  96.20: A force of 10 N stretches a spring that yau80x fq6a 7t1 i;bvihas a spring constant of 20 N/m. The potential energy stored i a6yt; a8bufix1iv 07qn the spring is:

  97.10: A compressed spring has 16 J of .r jwd-ze(lrdrz* :5b potential energy. What is the maximum spee j.* l(d r5wzz:r-bderd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botto: 50brcupxf x.m 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 thf5p :. 0bxucxre same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.