97.01: A force F directed at an angle of θ ,i)k6iq dfh1nabove the horizontal is used to pull a crate a distance D across a level floor. The w hiin,q)fkd16ork done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward h5h lfzg*x e mv3e4n;buj qd*30er with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the hobl*e*mveuq53dx;z h f 04g n3jrizontal force exerted on the ball by her hand is

  99.14: A construction labore (c)4 9y ,lbx2fw vg6jmxy5hrnr holds a 20 kilogram sheet of wallboard 3 meter abovmj4 blgx96h5,)rfvyyw2c (xne the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele f3dm- yw(c/.u)a;ae qph(i9 pa4vcscx 7yp. eration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J inufw7iaccmcp (; . dpqav 93(p)y.4ax/-hs e ey 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 horizontal shr74dft- jh/4ieu0f uurface for 5.00 s. The rd/-u f40th4iefuh7 j block’s kinetic 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 tz;5,5o ) mrn qmk6ejaqhe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal6)5jqmqrk ,5zmae n o; 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 k 3hvjw ;9el8jxg block for 5.0 s. The block was initially at rest ajx9vlw e3 h;8jnd 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 frozen pond throws a 1 1xj+n.k9slctb 12ng g kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other dir1l2+j1g.snnk9 gtxcb ection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air andn3reags o8we8 50f*b t gives it kinetic energy. An hour after the fan has be t bn3ews*re8o85gf 0aen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.zrk-glz+w31r;gf j qp*j+i g )50 kg has a position of 3.0 m, a speed of 4.0 m/s, and1rfl k g);g 3j-pgi zzq*jw+r+ 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 isiq)svbg3vwf e.)ms 0: on the middle shelf in the bookroom 1.3 m from the floor. If3ssv ig e0bvm)).fwq: the janitor relocates 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 oa-:n/w+aj ot (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 j-o+to:/ awnahe car?

  09.13: In the figure to the right, a box moves wba) m8sq 21udfm-mt0hith 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 ofF = 240N. The box, of masma2q1m bsuf0)dth8-m s 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 on*3)fw2fpvacg4ut 6, 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 being pushed directly t ucnw)4 fg6af 3opv2t*o 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 toif3 l-s+r;ls /vecs1ks;qk s 6 the right, each starting from rest, along a straight road. Car sks;cqklf1s/s- ;+v r lie6s3A 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, what is its speed in terms of B?

  12.07: What is the net force acti0+ sy(x:m) hdmcwx+u jdr32 qhng on the object during the time interval of the acce3 uxcjrxmd) +wyq : mh(+d0hs2leration?

  12.08: Through what distance does the object move dot/ faz+3 t.:3b8 kon nlbqi-turing the time interval of the acceleration.8n/:btkfaoq z n3o-3 bt+ilt

  12.19: The magnitude of the linear momentum of a 4.00 kg point mam89b8k* .uro8cglo n2c6cro wss 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 rg28.mc*clc 8owknb69ouo8 r interval?

  14.11: A crate gains 36.0 J of kinet8 y/; m nm9;ivbvggynkp4)s 2vic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the)vpk vimyv;2s4 n ybg9 8n/;mg mass of the crate

  94.38: A force F at an angle8r4lc33j zypwq) z3es θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between th ywlrj zs3z3q8p4e3 )ce 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 powern/:4 jvza;20i/cghhi ;ubip d output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg blockih nv ;j4: /uibi2/;g0czhdpa?

  12.18: A 1.00 kg object is released from rest near the surface of t5/l7al/6g wuji tj,tv8* ffyx 0gpwv2he 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 gravi fgavgt6/7,8w l0yj/* t pwl5 2fixjvutational 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 7 c)hdh2t1ks5j5 p9;un kyzjwhard floor and released. Assuming ts2 kdk7; jnh t)p5u5cjwh9y1zhat 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 and its height h above the surface?

  07.06: A 500-kg car 4z2oq divt)8bis moving at 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 mini24b8ov idz)tqmum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until vyen)e7xas30 it stops. If the ball travels 15 meters, what was the average net force applied while it was come)vn asx7y3 e0ing to a stop?

  02.26: Consider two laboratory carts of different masses but identical q1b+tw yr6mrkl zn,(3 kinetic energies and the three bz31l(,+tqr nkw6yrm 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 clt a/g0uv :vtj7 z1xvk7ay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in tkv7txjuv/1 a7g:vz0its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest st ;e7v. u3pstugraight upward from a flat, stationary 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 highes7e.pu st;uv 3gt 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 aheighmkgi( ) zgs9+0y nkcn2tH 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 the object while conksk( z c9y +mg2ig0n)ming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground 3:ce9z 5 qea*jzwf7lm. The object bounces offwe5j9z l3*caezmq 7:f 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?

  96.38: A pendulum bob )ox3 bhmiw2k/mass mon a cord length L is pulled sideways until the cord makes anm)ox 2kb 3i/wh 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 ( l-o-l p ert9 sdis :7higewc6-:xnr)unknown 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 the hill. What is the sled's speed when it returns to its original pt--rlecio7g:n6lpe s)r :9wi h d-s(xosition at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10k6kevp ;fnhzvyl 747( -meter ramp to a lv hk 67n kzlfyp47ve;(oading 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 to the loading dock?

  12.16: A constant force F=50N (as shown i ,j6ot* 6+jde4r56. rmylt3xxfvwy bkn 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 force F onthe box for t*xo fwrm6 5y4t3yrd, jj v6e.+xt k6lbhe motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from the lbw1n 7m/ ik6ctop of a tall tower. Ball A is dropped one second before ball B. After ball B is dri61mknc7b /lwopped 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 straiuxz 5p5w : ytb:t4p9 esy-o)xught 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 ob5ysbppwux4 u:et:z5t)y o9 x- ject 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 fp4+6og) 0o *wtnyeylN stretches a spring that has a spring constant of 20 N/m. The potential eneg) l*tny op4f+6e0oywrgy stored in the spring is:

  97.10: A compressed spri6p o-zby-os8ing has 16 J of potential energy. What is the maximum speed it can im-6 pzyib o8o-spart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rot oo.h zsz.8*n tr16ighp5o*n 50gnh est 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 reag61 *zh phoro g* 5n.oihnots.0t5nz 8ches 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 incline and the object for both trials.