97.01: A force F directed at an angle of θ ahk41f/1uh,e6 blx y ha/:p;wv/ rvzg obove the horizontal is used to pull a crate a distance D acroogvuw x vla:1y41z / p;6,h /hr/bkhfess a level floor. The work done by the force F is

  97.33: A softball player catches a baudq5m9:ssr gisrsc62 6 j t8:all of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dis s:29stj g6dmqsc a5r86rs:i utanced. 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 : vpa2yn6 e)gy5nr c21wj3 4rs/* m-mtim sjxrmeter above the floor for 4 seconds. During these 4 s-rj2tx/4gmmrr 1s) a *ip5y 2wv3ynjec6 :mnsecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blkl)ycwv;*, cp f8i (nsock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 Js wf nc,vi)8kc;lp( y* 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 on a horhbf -3**id v;ff4qgtnizontal surface for 5.00 s. The block’s kinetic energy strictly decr3dfb;g *f4nithqv- f*eases 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 exerted onsg41:umu epr 2-9 gd-0zycl pz a 3.0 kg block for 5.0 s. The block was initially at rest and sl1c:09lzu 4-g2pyz-r s pumdegides 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 bno ob 053qgd;mb4,ei qlock for 5.0 s. The block was initially at rest and slides on a horizontal5 b4q3;eoi0doqmngb , surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at rech6/c*2nfv r dx9) cqwston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the h6chc 2w )9/vqnx drf*cammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it fehi kodu7a:8l 0g6wa/ 0r.kjkinetic energy. An hour after the fan has bekh.k/ u00grw8jl 6aie: o7fdaen turned off,
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-s4 dboh k :/uo5a,wgx.0 m, a speed of 4.0 m/s, and an acceleration of x:o ud/ kh-gb4 s5owa,$1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old tea 1a*s*rk;jakxtbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to;1ak*j sr *aak 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 horsepower) of whb(bqu /75x*vz 0sn wuy*qd0 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 uh7/b50un wbzv xyd* qq(*0swon the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at tx0g gpo8 npimxk+0orynu5-u 3/x1 7k the bottom of a rough, fixed inclined plane. The box slides with constantp0u+xmo87pioxg ry15 k-t nn kx03gu/ acceleration to the top 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 box moves with speed 5.00 m/s at the boo*jjs yq 0)cw-ttom of a rough, fixed inclined plane. The box slides with constant acceleration t0q ojcjs yw-*)o 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 travriqvr pwp h -l/to-i ;-s7,;pwel to the right, each starting from rest, along a straight road. CarA has twice the acceleration o;qit ;ovw-hs-i wr7 r-/ ,ppplf 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 or v8+ rijp6g8 rky-m+on the object during the time interval of t-k6vg8 m+p8ji y orr+rhe acceleration?

  12.08: Through what distance does the object move during the timeigtrrw:8zz)-zd kj+7 interval of the accelerationg8drw t):zjzri 7-z+ k

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is 4ho 9+kyvc ea8changed 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 he+o 4y kcv98athis time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed (r,gc uk8p.3ex) ol2gtwbj:gz kv2g9 is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represg9wp3t ) c(2 kgjugb8vok, x .l2ge:rzents the mass of the crate

  94.38: A force F at an angle θ above the horiv0 )iu7gite )szontal is used to pull a heavy suitcase of weighg v ies0)ui)t7t 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 delivers a useful jcvuc-7avuk94 q54ebi x-a1 vpower output of 0.10 w to raise a block vertically at a constant speed. At what constant s v 4qv7 --4ia 1xjka59veuccbupeed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released p/ dh-. alh,g2et-y rvfrom 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 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 the2v.ltp-rdhy /h g ea-, Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held rj)l7hvrnlrk vh8jo0 :(,t t, motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationshj7trvrk 8hj(:)ol n,l ,0vrht ip 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. If thef43hkk e.: gva car takes 95 meters to come to rest, what is the mav:egf3 .kha4 kgnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows d-a dd wqs:m2g4own uniformly until it stops. If the ball travels 15 meters, what was the average net force applied wg2 mw4-asd q:dhile it was coming to a stop?

  02.26: Consider two laboratorzq ho2cr 1g,4/3zq7je i fhn ,g0ayuc-y carts of different masses but identical kinetic energies and the three following statements. Which of the above statements would be correct4z-jqc o270hcgaf3 ,q1uyr /gez hi,n?
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 iniv/b dym* u*ahr :v; eo8:6 -htioqdc7otial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentia*tou*/86be ; aordv 7v mh:odcy -q:hil energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u (bkfih ;m1,-vwq5vn*ty+gz upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concr iw+-m *qytbh1vnuf5 zgv,(k;ete 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 boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The)m pk-qmdj .-z 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 magnitz-pmk-mqjd ). ude 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 ground. The objeg+ 5 xq(*hlx3nsm -ljhct bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What wa(-*5lj+ghqx nmsh x3 ls 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 until thqzv *pg22ck3j5w-ju x-qwpr.e cord makes an angle k urgxvpqj3j.2w 2-z-5p*cqw
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. The sled, fi3epw14vo)1n0 ex pbwhich 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 an f)1i4 p3en1b 0vwxoped 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 movl8jopwdd8-y0-b l 5v ves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5-8b y5dp8wl dvojv 0l- 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 sho bv+bb7 l6e8wywn in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the blo6yb+8vwe7b lb ck 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 balpp /ug17o6q/ zhm ,ghjls 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 dr 7,zj h6/hpqugm /o1gpopped 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 Mo89.i5vkjoqr-i:)1bovh em j straight upward with an initial non-zero speed v. The object 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 av8qkvm ri-b 1.9:ioj)5 oje hobove the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/;0m )pbwx62tcc;wm dym. The potential c;bx2wm t;)wcpy6 0mdenergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential enuw/sw*ro /dkq7u ht ,:ergy. What is the maximum speed it can impart to a 2.0-kg ob quhokt w:rw7*, /ds/uject ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inczp,yl1v/a52gfw ,ic1k 0kouc line 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 ucpf2,gic w k0k/o,5 1zavly1by 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.