97.01: A force F directed:tb+*n/n 4 d 4cc lfl1j3ldbix at an angle of θ above the horizontal is used to pull a crate a distance D across a level d/fbil4c4:3ltbdj+l xnc *n1 floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving tow sd,k ldy /o4c3w,w9jin7n8- beph f-y( vl:sfard her with horizontanlpvf-kw8dy bfsj7 (-ly/i cs,doh:4 3e,9n wl speed v. While bringing 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 kilor:+ary8wb;g xouq */zgram sheet of wallboard 3 meter above the floor for aw +*gz/yx8qrb ur ;:o4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slids//9io6 tc )rod/efjbes with uniform acceleration on a horizontal surface for 5.00 s. The block’/ soj/9ted c for)ib6/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 b7x-6wkn1g trya ;lk4dew s9 6 with uniform acceleration on a horizontal surface for 5.00 s. The block’s kys7ke 6axlbwt 9rwk 4n;gd- 16inetic energy strictly decreases 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 on a 3.0 kg block fo3x;c )oqonq+sr 5.0 s. The block was initially at rest and slides on +sq oc 3xo;nq)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 6cktp5i8 (n-k,gnbjg on a 3.0 kg block for 5.0 s. The block was initi,- p c6n(b8 nkgikjg5tally 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 ini;nsavh8 8t6 vloww s24tially at reston a frictionless frozen pond throws a 1 kg ha;ss828o w av4l6nvhtwmmer 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 kinetic energy. An h xa9+(up+r smam nt,pksfgj+;3(af* r our after the fan has been turnedasr(u+; jnf pxsmaft+g,mk( + 3a9r*p off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of maxdx jz t8p7pecd(k sm/d*x689 ss 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceler sx88(tckpxd97 dp*jzd /6 xemation 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 bookroolvm/vlv3u fk181cy g; n bqwe);ql3f4 m 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from thefy/e lb n uv38k;g11c3qvw)m4vlfq l; floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delix2a x94w,rla ;gc d,xdvers 24,000 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 magnitude2xl;cr,d d, a4x wxga9 of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at thek)tls8yg 1a .u+p4 vci 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 force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhe1itl+k c .8yvas4)up gn 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 mov .ssw8vr 7duc.es 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 force of F = 240N. T s..wc7vsd 8urhe 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 startingyn 8lp6wy + 0c77f)chii1h ux,zgdae* from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distanch)cudw*17 cylap yin7 0 ,z i+hegfx68e F, what is its speed in terms of B?

  12.07: What is the 4z/.+4f5 tnm ktnfdqqnet force acting on the object during the time interval of the accelertn4qf 5dzq t+4fk/nm. ation?

  12.08: Through what distance does the obdoxo(x h.9eazuy ss6 :c-e, :r9 f0vdhject move during the time interval of the accel.d0ux (o,s9oys6ec-fev hr:ha:xdz 9 eration

  12.19: The magnitude of the lin8l 5ql.,dogc. rlp: wxear 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 during this time io8.w. lqpdrl, x5 cgl:nterval?

  14.11: A crate gains 36.0 J of kinetic energy while its 82 oqj30yw ombyg -n37wuy)0kbh-fs zspeed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represen3zwfmy y-by o-b 0sh w8o0gu23q)knj7ts the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usu/n qzzz2pg n;c14z:bed to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The ;n2zgzqn4zu :c /z bp1coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts-20 )uanl.gflyvyu* y an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will2uay ygy*lu v )-.0nfl this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasedqy8mio )w9n6s 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 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 faso8miwq 6)y 9nll?

  96.18: A rubber ball is held motionless a heig 78fm6f.zp k4 4jvtkjc 5av:+x+ oknwght ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the fok7. ++:65vmfjt4vok 4xzcp wk8fangjllowing 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 jyu;eap6 i6e+cm5xj;n8u pt*/ l t+ilahead. If the camu;t6;ajp /i ucn* +ep j6l5i8t y+xler 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 myd2 3+xfwfa87to+5+g4cuh psgw xq0i /isq3 p/s slows down uniformly until it stops. If the ball travels 15 meters, what was2 q8 w+acfd+ pwq5osup3 4 0s/3xihxfg7gi+ ty the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic xo2:ubcb7cl*w3v y*e energies and the three following statements. Which of the above statements woul2*woyecu: vc*b 7b3xld 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 c;l)8 p-e: lf fk1qftoolay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air r f1ltkqo)8fpel-f :o;esistance, 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 concretx8)p eyc(3x ybe 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 motiox8( b3cpyx e)yn. 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 dsiyir ;opysogs+ yk .i) q(/0xm)v/2b ropped 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. Assui(/; iyb)o/m . y 2)0y+qgxkvpiss sorming that 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 M is d6rg wvbtcn t4,x40br3ropped from aheight H above the ground. The object bounces off of a horizontal surf403 4bt tgrcxv bnw,6race 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 sidewa:ewof93b4 +ms4bhdbp ys until the cord makes an ang9m4 +b4h bfse3:w dobple
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 unknon y2z( qalaef .u)co+4wn angle. The sled, which st.)2cu( 4zq+an oyf ealarted 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-meteruo2.n3 f0x9jqu y o4je8md(; u 2ftgubtdde09 ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton hmjb(u2u2x d4ty9n;gu. eq98 odef 00ofjtud3 as 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 shl4ys:i4a mamz-bo: g :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 oo b-4mazli:mgsa:y: 4ne 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 B are each d a3i9.c;4a kym .jlprdropped 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 t4iyr9; cmjaa.p3.k d lhe two balls changing?

  11.28: A person throws an object of p e q*f0a.lqm5h,86xf*wt jlnmass M straight upward with an initial non-zero speed v. The obehtpal lwfq*q58 0j fn,m*x 6.ject 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 staq64 vt+tbee 1k7 *kd4i kuhe0retches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprin4h1e it u+k6 kd7*a ktveb4qe0g is:

  97.10: A compressed sp6 xdhfn pm p2zp,hs a)2d+f.u)do))s pring has 16 J of potential energy. What is the maximum speed it cam+af)6udp x) z, d)d)o2 sn2phshpfp. n impart to a 2.0-kg object ?

  

  10.31: An object of mass M startsus4fw d +*,kkc .sffz: from rest at 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 comp4. u :fz,kfwkss *+cdfare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.