97.01: A force F direcy*c)iv a+ 2f :vmjyap+ted at an angle of θ above the horizontal is used to pull a crate a distance D across a levva+j y2v:pifmay+ *)cel floor. The work done by the force F is

  97.33: A softball player catches a bb g0a.kg :8wu6mh 4qnxall of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a d.:ag4 0b6kgw xh8qmun istanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheets wb,r 2g4 hx8y3a a)+p8uszcz of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbo8 s,4a+h aw)x3czbrp8y szu2g ard?

  17.11: A 5.00 kg b : xhg89cu9- :ro-cfg)i udk lvser6-slock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases frsevcir)frg k: uu --d9- 69:cshx 8olgom 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 shz l-wy6s6zzkv5703gku sv7 with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrease7v-7 6w0z kgzu sslvh53zk6sys 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 thvv58 av:2x-ugn5 qwqfe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at re:8vvgu a5x qw5fv2q- nst 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 is exerted on a 3.0 kg block ,n(q oh lr02 yf+mmy7lfor 5.0 s. The block moh+q7m y0f2, y lln(rwas 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 frictionless froe 0 mw1v6u6ypnzen 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 direction. Which of the following correctly describes the a en6 16vuy0mwpbove situation?

  03.14: A fan blows the air and gives it knpvzm8.fga .: inetic energy. An hour after the fanz g.:f. an8vmp has 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 3.0 m, a spa9-( 4+j 1rf cu5atgboet7oe ceed of b1ea-+ ct4ou cjef5 7g9to (ra4.0 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 text-ihw 8uq 7+zj);ui1lhr)joio 0o gt;a books is on the middle shelf in the bookroom 1.3 m 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 7+08-l)rhhoj)1i oo;i uitwj;g zaqu the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts hmajynr6ds v aa0a3-; r8e49 k(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 magnitude of the retarding force acting on t 3 ad6 ;rey 0rsaaa4njm-kh98vhe car?

  09.13: In the figure to th hxu)wx jw,j d7goja1 **z9m)ve right, a box moves 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 being7 omxxu,aj j)hwzd v1**wj9 )g 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 :adpb1 0ae1x ql3 rax7h.wuf/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 ra q3.x1dw /ufha0 pa:7 lbex1it 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 straigh6n8s22ac5w/oyh wj. g;qadpct 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, dcy.jg8q2 apns aw2chwo/56; what is its speed in terms of B?

  12.07: What is the net n cmb9rv0)+n qzv6ymb r.cm1 0force acting on the object during the time interval of the acceleratrbnm.c6v0b z1mv) ycnmr 9 q0+ion?

  12.08: Through what distance does the object move during the time intera ot(/ 9 opckevgh.sr96+ gw1 iu*,lyuval of the9w*(1vlp/,r . aokut eu9gc6 oyg+h si acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg po4ub(pir-4-ty;zoefl1qj 7g j int mass is changed f boq-4fu;j 1igye( pj r4z-lt7rom 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 interval?

  14.11: A crate gainsyg5jw g;+j: ss 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best ;gw+ sgjjs5:y represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pul(difb-2 /jp ixl a heavy suitcase of weight mga distance d along a level floor at constant ( p d2/fbix-jivelocity. 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 d9/( ;jfar r0zoqvw 1bwelivers a useful power output of 0.10 w to raise a block verticrqo;wfrv (9 b 1wj0/zaally 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 o9lbq+5ff z 72ejotl +lf 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+ flq7o+b z59f ljl2et 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 motionless a height ho above;mtrxq z4x*8j a hard floor and released. Assuming that the collision with the floor is elasrqzt*; 8xx jm4tic, 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 barri xl0v)(n8mu amer ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averag0(mu a)ml xv8ne net force necessary to stop?

  00.26: A 500-gram ball moving a9ev9r 5l nlss3*;+kmjidie18 ovmj6l t 15 m/s slows down uniformly until it stops. If the ball travels 15 metersi n 8 esjdvmk1lv;69ilo5 +elmj3r*s9 , what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratorp6vj l-ldgmrm8 8dt)+1x kg .gy carts of different masses but identical kinetic energies a)lp1j-r mdd txl kgg8m6+g8v .nd the three following 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 is tossed vert(piy25q7dlkq2is psr /q zj0.ically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest poinyqlz .i/sd5 sp2 k0q(ipq2rj 7t?

  06.20: A boy jumps from res )9w(crss7r v q5ten1ft straight upward from a flat, stationary concrete surfacecsf91w7q e nsrvt r()5. 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 and the concrete do on the boy?

  02.48: An object of mass M is p(zpmr t 5 xkt4g255gvdropped 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 g rp(55v tz42kgtpgx 5mround on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The obje/yem0e;uy h :lct bounces off of a horizontal 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?mh;ey :0/uely

  96.38: A pendulum bob mass mon a cord length L is pulleduw kim*vl1 9cb(9 4)-ynf;ht h5i ohkr sideways until the cord 9kbh1 )u9rh -lcf;o nhyivwitm45k(* 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 uwi9:wh z.olm;ovv0 n4 nknown angle. 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 position and momentarily comes to rest. The sled then slides back down tz ovwl;h:49w0nvo.imhe 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, alonyngw :nol9 t 6+sq/z9xyz(c+ag a 10-meter ramp to a loading dock, which is 1.5 meters above the xcg 6a9o+/qsylzz n +9tynw(: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 shown in the figure) is applied for th-rn ad 5w(mpji-d2lpia9w-i; e 6.0 meter motion of the box upward along thep wmda- 2-(-p5inldwir;j9i a 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 a cjsj7fd1*s-/l uav) veam4eaf-ba 66nd 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 ball A strikes the ground, how are the mechanical energies of the two bal 4fv-e6saej)fj1b6aad*/sl-ca7vum ls changing?

  11.28: A person throws an object of mass M straigncq 6d-)ktf l4ml:gl1ukn c/,ht 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 164gfd/cnkuc-,q l)k ln t:mlof mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretchesok4:*lr; ch3zdrgb *k a spring that has a spring constant of 20 N/m. The potential energy stored in the spring is:kro3 :gz* ;bhk4l*dcr

  97.10: A compressed spring hass yn64hryz26h 16 J of potential energy. What is the maximum speed it cann sr642zy6hy h impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of ,6wvc6zp+d az 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 cdp azw6 +vz6,compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.