97.01: A force F directed at an angc46 m6a7/clluwe2r pu le of θ above the horizontal is used to pull a crate a distance D across a l62wulec 7l 46ap/ rmcuevel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, whicm/nybw:a 92c eh is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. n:2w 9/amycbeAssuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer cg t b*d9g8qx, 1qyt:.qwts4x holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Durwyqb tt x x.:g19tsqq84,c d*ging these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with ui) iomy7kdx88(/lvmmt2/n t:dl e 7anj0 dv3oniform acceleration on a horizontal sur3l0mve7 /2d nm7(:im jdtotiovk 8yn)la/x 8dface for 5.00 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 block slides with uniform acceleration ud-yq(zj 5w(m on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases wu( -zqy(dj5m 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 forw-1p6cnhnixq x s39hnq15gk q xcq5,1ce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was inx p nc3s5kgqq ncq, wh5 h1q96x1ixn-1itially 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 ruqst : ;cc,fq,ap- u5vight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest anduc:fq,utp-,cvsa ;5 q 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 frict;d2,f22ga xyy3r1hhc k qm7i xionless 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 direc3 rmqhk f a;cx1d x2yiy22gh,7tion. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and ge )**zju+zy. imp,zx cives it kinetic energy. An hour after the fan has zmc,zx)*e.jpy+u*i z been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg fvv4*d*za a :ehas a position of 3.0 m, a speed of 4.0f v:dez a**a4v m/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 bookroom 1.3 mv dlyhx i154v6 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. The box has a mass of 10.dv5hl4xy16iv 0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower. q7ro ok4eh-b2 myz:yyn(p yf(dh. 9g) 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 the47gy:m o d2 yk-hnybr oe.9fpzqh(.y ( car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bgq0fbfe3+.6 x 6iuiy xjvo0 r6ottom of a rough, fixed inclined plane. The box slides with constant acceleration to the togov+xj6 60ife6r3ib .quy xf0p 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 right, a boxsh4rd/ uxt j46gq1k: n moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box q uh1g 4:/njx4rd6tks 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 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 88)( 5(lskge :u)z3f4fi gxo dvxa xezright, each starting from rest, along a straight road. Carf efgxl:)x4z(8x 5z8ak ei()d3gvuso A 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 the object duringpetyh.e (f (a4ke 8;ja the time interval of the a;hte yajp.ek4(a fe 8(cceleration?

  12.08: Through what distil .ss h:sb xn)2t o69ac2k(myance does the object move during the time interval of the acceleko i296h: s2 sm xcltbna(y)s.ration

  12.19: The magnitude of the linear momentum of af 3j0e/vaj bt: 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 durine :fj/tvj0b 3ag this time interval?

  14.11: A crate gains 3*ps*894q za.oxlhsk xpiuur 2b8k 2x (6.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m8x24pzrk sxi 8.*xlu*qk s (uhpo ba92/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above- znqt 7pwnq0mcz,xec6bmt87e16 x2m 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 between the floor and the su n8mx6nbm c2q-t,t1qw7pem70ezz6x c itcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward ffjniz3rv w7 7 urv) p+:xi.4riorce and delivers a useful power output of 0.10 r3ux :rf)7w+rpj .i7vi4inv zw to raise 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 near the surface ofk f.3z19vq lqg the Earth, the grl9vzf3.q kg1qavitational 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 acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionlesst wku.osy03,i0 pko8t a height ho above a hard floor and released. Assuming that the collision wit uok0wt38o0iyt.sp, kh 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. The driver sees a barrier bt .b0d9bd f(vs80s hws 1ovzc*ji.6u ahead. If the car takes 95 meters to come to rest, what is the magnitude of the miniv td8 sv9*f60ds.(0cb h buws.obz1jimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dob/dfat 1lh3v8;af:f a wn uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comi h lbvft/3d aaa8:;f1fng to a stop?

  02.26: Consider two laboratory carts of vm. o zwu9u6v-different masses but identical kinetic energies and the three following statements. Which of the abov-v z6. owmvuu9e 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 verticalmx0-iq, pznd ebl5 g0/ly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the ch l0/m5egpb 0xdq,n -izange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary co6exwrqulg* 5 nq-i8j +ncrete 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 physqglu -e6 n*ri8x5wqj+ical 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 abo* fe:5hexd0h5 g a4qtfve 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 resh55ef: a*d4f0e gxhtqistance 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 abom n8enxp0bqg 17 j:*nqve the ground. The object bounces off of a ho1:*nnpq0gm qx7 j8eb nrizontal 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 the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidew:+nuxxlr0m9u + f 2budays until the cord makes an angd+b: xmxulf 2uur 0+9nle
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 angle. Thwtma 9 60cypa1a )su(uz r48qo. wq3sye 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 original position at the bottom oaq sy wr mt3.641pw )sq0(czuua8 oya9f the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter(6 ikcekc d4o;vp jgoc);)1 rjz**csm ramp to)*gcc1 ;rkko)ds;4j pzoc* jei 6(mvc 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 dock?

  12.16: A constant force F=q1)zj0 1ew ks; y 2)nwumjfo6h50N (as shown in the figure) is applied for the 6.0 meter motion of the boxuk hjes wmq )0f6n;z1)2 j1woy 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 balls A and s9 dq41mqy ,wc ritb/)B are each dropped from rest from the top of a tall tower. Ball A is dropped one second b/ wryt,)q is9c mqb14defore 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 wit oh-uk2lt mg kj(0r srk*qd*(,h an initial non-zero speed v. The obje,*h2ukkr okr( (0 *jdm-tgslqct 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 +()6odt z ;tyap4jjktN/m. The potential energy stored in theyaj +kdt)zpjo 64;(tt spring is:

  97.10: A compressed spring has 16 J ofq awl+yu r ,bij66bma-wt /n:/w*rmr) potential energy. What is the maximum speed it can impart to a 2.0-kg obat w ,+wu /q)6 bbrnr j*-r:malwymi/6ject ?

  

  10.31: An object of mass M stql x+io h.+mydule w)2fw;8 ,jarts from rest at the bottom of a fixed incline of height H. A person decid+hwjfl o lx8qm2idwe)u,;. +yes 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- zero coefficient of kinetic friction between the incline and the object for both trials.