97.01: A force F directed at an angle of θ above the horizontal is used to pu3 nky 4csc5x;f+uyq j)ll a crate a distance D across a level floor. The work done by the force nu;fy5 q)3jcks+x4c y F is

  97.33: A softball plarrkp,v1cbxel6-n4 k3rhf 0e ;f/8d nyyer catches a ball of 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, the horizontal force exerted on the ba prhe/ rf,0 v 3;db1xk4fc6-rlnk8yenll by her hand is

  99.14: A construction laborer holds a 2 /jaz4+gyo+2w,bg ck x0 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the ,+4+gz/ k2jx ywg cobawallboard?

  17.11: A 5.00 kg block slides with uniform acc4s-0a cxiw(xbo ;imak 0*oek+eleration on a horizontal surface for 5.00kb(kc ;0 s ei-*+x4xiaow0mao 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 ey,6sv 9k1x hublock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreas shvuk6x1y 9,ees 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 *hdf ipcf(2 t(exerted on a 3.0 kg block for 5.0 s. hpd*c(ffi2t( The block was 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 block 0 zjr+s;cot.2gbwr 7y k5+krkfor 5.0 s. The block was initially at rest and j;g ry.rksowtk7zr+kc+02b 5slides 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 zmlg/,zseq3z 4/h k 4uh-k/(.tl ubfga frictionless 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 othg-,(eu.hzhz4b/kg3 u/ktzfsllqm/ 4er direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An h 2+zdkejibq c fxi12/ho ;/4dlour after the fan has been turn+oj2dcixil4/k e/qd fz 12 hb;ed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, jxj8/a)o pyg, a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/x g8ajjyp,o)/ s, and an 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 bo4udnsw 8m gu0du2h 8;vokroom 1.3 m from the floor. If the janitor relocates the box to the shelf th2nv;8smudh u0 g4 dwu8at 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 24,00 dwxb 9zb2d c)8ob)q3l0 watts (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 fo)l db 9cqbxwz)3 dob82rce acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bottomc1sw nyjlu 7c 87q-of2 of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed direcu2- fs7ol8c cnw7qj y1tly 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 tho s/o:1rgoph:,vo:dryf5 b-te right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with coo: -drbspgo /1o:5fh,ov: t rynstant 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 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 ,slqlrs .q 32+ftu(laright, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car Aq ( la3t2fs+.slqrl,u 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 th40dlahzi*avfu:9 +q d d5 vd-+de pnh;e object during the time interval of the v5duv aa9+ h+iqdd4-ph *;0:dle zfdnacceleration?

  12.08: Through what dis 9wsngkhbp, .nuw4 6a5- eojm:tance does the object move during the time interval of theso,6 aph-4ww9j b.m:5e unkgn acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point h yo l1*lze2h6mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is they*6llheh z21o change in the kinetic energy of the mass during this time interval?

  14.11: A crate gainsy mp154ito0mzhoa+y9 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of h4oa t+ 9myyzmi5o10p 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 he,mr7ns .up5f kxp a11mavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the su1rfm7map k 5psn,x1u. itcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an f.m ;wdt 7;pcuupward 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 kg bloduw. p7fc ;;tmck?

  12.18: A 1.00 kg object is released from rest near the -hh o .tp6vyz /k6rbu1surface 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 done by the gravitational force actinguzv6hk rh . -61oyp/tb 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 ra5lx-cw ; w0dweleased. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the tot0 wlcd;wxa5w- al 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. If thesbne3sj.,lrhyen31 3 /l w0c f car takes 95 meters to come to rest, what is the magnitude of the minimum avera3 srj/ .1benlf,hys3en3c0lw ge net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows d7f:wihsus8 t0own uniformly until it stops. If the ball travels 15 meters, what was the average net force si7f8w t:su0h applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different z ba3m0j(.ypa masses but identical kinetic energies and the three following statements. Which of the above statements would be correct? m.0baz pa3(y j
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 ofsyg + 2n)v.plu clay 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 reaches inp 2.)ygv lu+sts highest point?

  06.20: A boy jumps from rest straight upward from a flat, f xpp: 5s1qlx9stationary 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) betwesxx q5p9f:p1len the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH a/dvyj,2 tym9u(b xc6 a ik5m,above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming i2a5mbcum xd 6ka, y9,t (jy/vthat 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 maj 6hf8tx7)iefki 04x yss M is dropped 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 jiyf6fh)x 0t7 kx48eiH/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 mass mon a cord length L is pulled sideways t3,a q,wff z6euntil the cord3 wff e,z6atq, makes 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 angpb-j:4/ul.qva t *wnernkdql8,m l 5(le. The sled, which started at the.t: k jnd,a4pv eulrwn(ql8/*5m-l b q 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 original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalkraqm ,nz rnhxil7*d;1 p1os. 7, along a 10-meter ramp to a loading d71n a*zqp dm i1xh7.,slnro ;rock, 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 show)o/ ka,e o(ex8l6zzjr tm9y q)29jeefn 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 work done by the force F ont /f,y2) t9 e98ejr)ezmekq(oa6ox jlzhe box for the motion?

  04.48: Two identical bowling balls A and B are ep y90na5 c e9.lunugd2ach 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 tlayng9cu 2n up9 d.50ehe mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initig .*zfxep lur 2y6h07kal non-zero speed v. The object rises to a maximum he p 7g2 .hk*lezrf60yxuight 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 10n ph(n3 / y*yd2nig(hs,figz3 N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in t *sz2(3 in(pfhgh/n3 gy niyd,he spring is:

  97.10: A compressed spring has a b+u 3fmq4 55ph/ jlsggcyw3/16 J of potential energy. What is the maximum speed it can impart to a 2.0-kgps/afg5mq5gw3 4+ 3bj ul/hyc object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixe wu:hb)ly-pxr b/rc:3d incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shoxp bluy:h /) :b-rw3rcwn 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.