97.01: A force F directed0d4y;;x gcmg)xrp0d i at an angle of θ above the horizontal is used to pull a crate a distp)gyr40 d;c i;xdg0 xmance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m *3-+ yt(tcuhhfwe;vs, which is moving toward her with horizontal speed v. While bringifs v+e yu*w-;t(h3t chng the ball to rest, her hand moves back a distanced. 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 w0l/g(o:+*b/3fhhxs7 kf ltfgpun- l sallboard 3 meter above the floor for 4 seconds. During these 4 seulf/bh+xf/p*sh(n gso -k:70fltgl3 condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal dibzdz 1itf, k)/3 vj+surfadb)+f3 t/ ,jzvz diki1ce 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 sliuzp w.504mf0g pb hli/des with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J t 0p phgb5 u0lfi/z4mw.o 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 ime51j*-kjf jdu:x9 v js exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surff* j1 d 5k:xjj-em9ujvace.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net mi 4 w,gbjsbxigk qj:l4d.994force directed to the right is exerted on a 3.0 kg block for9wgql4skb.i4g4 im,jj x 9: db 5.0 s. The block 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 frictionless1a5kqsau68 u z frozen pond throws a 1 kg hammek 6qu8asa 5zu1r 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 following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetiu. uzxew(nu*r. 50 ieic energy. An hour after the fan hasxnwue.r5ii (u0uz * e. 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 has a position of 3.0rr+ 0xxotu) ,v m, a speed of 4.0 m/s, and an acceleratio rt, uorv)x0x+n of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is o(x- 2 o3 a,0npahjq hg7x;ehdvn the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocqadhj3(p ;2xh70axon vh,-geates 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 horsepowerg,9iofo5qw,yg e2 vwd-kt 5o() 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 ggoqe25 ,ft5 yo, 9ok(dw -ivwmagnitude of the retarding force acting on the car?

  09.13: In the figure to the ,5 vms bz*3fnasx8n3g i)ah16lvptx2 right, a box moves with speed 5.00 m/s at the bottom of a roug*,it85z3hvms 6b 2gsx a lav 1f3px)nnh, 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 = 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 botto:sq;ep +cm 1gscow0m:m of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the 0q +w;esgomcs cp:1: mincline 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 starting from rest, along a stpujt )ff d:,hg*f ,j v7oa:6 azgrn(4wraight road. CarA has twice the acceleration of Car B. afj vt:(prf4,g 7a6:fg w ju*zo)nd h,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 5bsx 9fi.8xfiobject during the time interval of the acc8 i5ffi b.sx9xeleration?

  12.08: Through what distance does the object move during the time i; 9q*uygq5 g er0zi.pgnterval of the acceleration*y09.gprggq 5izu; qe

  12.19: The magnitude of the linear momentum of a 4.00 kg point masb:n6kt/kxv j:q(7 h; b+ ao9mqkzixp9s 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 energ/jpita (:9o b 9bmknvh+xqxk6;q7zk :y of the mass during this time interval?

  14.11: A crate gains yjo (nk/yk+:m.j,g tq 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choice j/km:+tkyn.jo gq(,y s best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pub )+rrt:/q.9bh oqhdn mg+d9 dll a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is bh +grm :)ddnhq.d 9+/btrqo9μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a upi:luxs 2d,m0i 1wy/rseful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane y xwl1mr2/di0s i up:,raise a 0.20 kg block?

  12.18: A 1.00 kg object is releab,sn3e,rgx 5 vsed from 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 onege,s nr,5xvb3 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 motionless a height ho above a hard floor anzt 6s(jr3 1koqd released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball t3jqsok6( z1r and its height h above the surface?

  07.06: A 500-kg car is moving at2rp,ent)-zb hev4:p fxxvw2v2 +o5xn 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to spf2 o v+n5, 2x-)vnpexh2rw :xe btzv4top?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until bfu4an5 phyncx 5vn(wkpq*;0 49o )z qit stops. If the ball travels 15 meters, what was the average net force applied w cfz5(nhy;)5pu pon bka wv49xqn0q4*hile it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idux9si ;slnxjn9 b+o6 4entical kinetic energies and the three sx n u9jxi;+4sln9 6obfollowing statements. Which of the above 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 y fektj2 f6vs34)+aa:o xg)quis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoringvf)uya3qf4js:o)6e t2x+k g a 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 from a flat, stationary concr/*c-iz9mb+, wf( erk en/d+jmppzl/aete 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 physiciz9l/b-e ( j+f/w +r,*mpzdm ape/nc kal 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 dropgmed4p spq. khbmh0c0j 8muf 164(k;yped from aheightH above 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 resistance is negligible, what is the magnitude of the average constant force exerted by the ground on theebc.(6 pm8y1kjqu 4shg 0 dmpfk4h;m0 object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The obrsf(6ay4z ,qa/9 i*/sl- +gxeotp o biject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximumax+eo(z*/ftlysi9 p/ qa,6 4r-oibsg 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 3c0ot 6tpk4jl mass mon a cord length L is pulled sideways until the cordj4t0 tplco36 k 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 angle. The sled, which l3or .dlg5)(7wxu /*jsow eor st /)5o r.olrd *l7(eoguwxsw j3arted 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 of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp2( imxbuz0+ wk/wjve/74auz j to 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 e0j( a xz wu +z/v4b/2uiw7jmkto the loading dock?

  12.16: A constant force F=50N (as xz ./ jgx o- 9t)solyr-3qj)xd)h lyp-shown 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 ftz) xorh.))x xsg9yy/ qlpoljd-j-- 3orce F onthe box for the motion?

  04.48: Two identical bowling bl8svbdx 70 9ryljmxrryvk90(g 5bw3.alls 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 blrbvlbwymrd(x x9 0gr7yj8 59 v.30skall A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person thro1l 8k6ft4sks nws an object of mass M 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. l fn8k16sk 4ts 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 auh+u v1 ez8xlo4 tdt+8 spring that has a spring constant of 20 N/m. The potential energy store8uuhet1+x+8 tvdz4ol d in the spring is:

  97.10: A compressed spring//,, gyw p6 tp2rfpcdm has 16 J of potential energy. What is the maximum speed it can imt,2//pr dm6,pfgpy cw part to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at sp72.; spue sbqs9 +ru bzk*v: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- zero coefficient of kinetic friction between the incl2pz.ub7k; :sse sqv* +9bsrpu ine and the object for both trials.