97.01: A force F directed at an angle of θ above the h*zo n5ig(r 1yxorizontal is used to pull a crate a distance D across a level floor. The work done by the forcen (*yxgr15 ozi F is

  97.33: A softball player catches i/rqfll3hsk l, 9 0id9a 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 oi/ildk ,939r l0sf qhln the ball by her hand is

  99.14: A construction qmwkt99+q4u3 d ,xu. fh wsp6olaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expend9ku+w69dq.mqo f 3u wp4xths,ed on the wallboard?

  17.11: A 5.00 kg block slides with unifore27ejrfw 21kem acceleration on a horizontal surface for 5.00 s. The block’s ki1 w27 kej2freenetic 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;0;3mb( yjd ft) *w kczmduf*a slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic eneru;ym0 kff(*jd*3 cmdtzwa ;b)gy 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 pnh642bcd-+qg- 5r7 qb xil cifor 5.0 s. The block was initialx-dgcq +rq7 bh4nii5l6 c 2bp-ly 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 igl utj1)w7 d8qs exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and dj7q)8uwt 1 lgslides 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 frictionlly )r75a9406k rj hb2zoyi. znvtjl.aess frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction) r7la6 2th0vr.k.j ny4y5o izba9 zlj 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 hour 1dkbk z e/8t ri:3,jitafter the fan has b:tkb/zi8t,k1r djie3 een 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. s1 ad.cir/uq)rg0s8f 0 m, a speed of 4.0 mfd ssg .)8ric0a1rq/u/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. ;5 advtrl;*oy3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m fvd* 5yr ;tlo;arom 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 (abou;fc sl3m6 ,y kyow6fq*t 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 magnitudefmklqf *sw ,yy 66;c3o 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 the botrz( upy is jr5xv7k778tom of a rough, fixed inclined plane. The box uk 777(rsivyz8pjxr 5 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 righ c+1 ka ob)wf+wyb79jot, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelera k9ab+7w+wycfooj 1)btion 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 right, each st8vo5l9m 2hp.r2 q tcecarting 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 distance F, wh v5lcc28pmhqoe.2 t r9at is its speed in terms of B?

  12.07: What is the net force acting on the object during tdx ,8m/ w34d7ju3trdun :twqk he time interval of the accelerm wxk3dn u743 :j/dd,wtruq t8ation?

  12.08: Through what distance does the object move during the time interval o 5n8g ui0;xbsaf the accelg b5nx0; as8iueration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chato9 o yp.nh1u6 jgw;.fnged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change p .9h;t6o o1guw.fjnyin the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whih 1v kj0w7cweiu* i)1zle its speed is increased from 2.00m/s to 4.00m/h01)i* 71 cuwvkiw jzes. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an anglf36pdsp7oj, le θ above the horizontal is used to pull a heavy suitcase of weight mj3o7 p,fl6sdp ga 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 iow0oiwlj77ngp( 0 6r power output of 0.10 w to raise a block vertically at a constant speed. At what constan0p(ojiol7 ww 7n60irgt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surg o7djj 6wa54o:( kekuface 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 bwko d67jokaug 5:4(jey 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 and repcz ;v+)469epqxkr xcleased. 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 pcz6+; e4vxkqr9 px)c 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..arz9d5 p63 ea:txzij If the car takes 95 meters to come to rest, whax ja5p3.rt9z: 6 daezit is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram bal 4; d7lcnqf*/p0jj yiyzr1r +rl moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to4rd z* 7/jyq j10fr+cprlny;i a stop?

  02.26: Consider two laboratory carts of different masse69 73*ssjh e17q6llmytmkq rab(y(rh s but identical kinetic energies and the three following statements. Which of the above salmk7s7rmhh1 qelq66r 3(yb 9tyj(s*tatements 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 vertic f2x .4av3:tqxyvy z9iyjx/j8ally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ent3xyiy82 qv.xa 4vj:/yxzf j9ergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, sthaidfwmkoo2qq b( ,. j4j(-5hationary 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) between the boy’ s feet d-wj4o hq5 .fmi( qa,2bh(jko and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground.owvodc j gom 325 :eyd8j7n.n. The object crashes into some soft earth and comes to rest by compressc: ono.wy7m.j82dejg3v 5doning 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 the object while coming to rest?

  12.48: An object of mass M is .rkjamvqw(6z56by v8 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(6 8.a 5rjm6vwqbz ykv 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 pulle2oojhc61d et).dv1g80w i3 r(eyy wzxd sideways until the cord makes1oo te2638w0wjdyzxe .)d1r ic gv(hy 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 an;0whbld m.gn chet*n/0x;1jmgle. The 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 positio /n.eh;hw ;00gxjntd* mmc 1lbn 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 fromtg/h p4qw. sa+ the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the totalpwq+h/.ga 4st work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applbv kft.(3 0uefied for the 6.0 meter motion of the box upward alob0vk u f(ft.3eng 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 ais; wy5(+0wj(l mi y *zpcjfz3nd B are each dropped from rest from the top of a tazw0(c (zmfji ;wyl*syp53j i+ll 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 the two balls changing?

  11.28: A person throws an object of mass M straight upward wivgpg +sxw3v z96d( r8sth 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.xw vsvgd zsg893+ pr(65M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spia,n9y 7oh qh ,.bjdqz4osn.4ring that has a spring constant of 20 N/m. The potential energy stored in the spring isn j q9 hsaon ydh.4z,b,i47q.o:

  97.10: A compressed spring has 16 J of potential p h.;u6clt506 s.aeboqo v7 ttenergy. What is the maximum speed it ca .es6o0 t.o;lqt5vcu6a7hpb t n impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from(5clg wnv+x -q 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 compare forv 5w -+qnxgc(l the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.