97.01: A force F directed at an angle of θ above the horizontal*x fsbf1ek-sakb/: ri7)c as( is used to pull a crate a distance D across a level floor. The work don1br k e: *bfc)ss ai7k(/asf-xe by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towx 8ig* dyjrj)40mbec7i+hi4 k ard her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced.d 4ei0+*8j j xi4yr)mbkcgh7i Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer hzb*kan xtyfz+s,g8(: .8vd c iolds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much powe:f( gysntdv+za i.8 c8,z* xbkr was expended on the wallboard?

  17.11: A 5.00 kg block slides 0n/fd;e . gu1uwj fnjxcrx(05 with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic egufx;0 cj0 fnn5e u1w.x /j(drnergy 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 with uniform acceleration on a horizontal sw p qu+jxxa7e5:8i;x lurface for 5.00 s. The block’s kinetic energy strictly deq alju x5i7x:w+; ex8pcreases 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 trai7h9x+v chn,)5* dmwa2iovo the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at re2a wvmh97)h*ni, rid+c5x vao st 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 au;waybf ,plxua89 -(l 3.0 kg block for 5.(fpu; 9 -axbl8ywa,ul 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 k,e ykyarz-4 )reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction whil-)y k,akzey 4re 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. 4ilvmr p; y5t)An hour after the fan has been turned off, p4ir )yvt ;lm5
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.j6g n+q0dinjhh+ r)u;50 kg has a position of 3.0 m, a speed ofdnirj j)nqh+ ; u+g0h6 4.0 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 )8m8yvqu*g c0hzvrhe6z.a 4 jtextbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the 88hzj6g. )m4vay c uh0rzvqe* 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 h yb.a u vz),ftjv;h(+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 retaufh;v + y,zj)bv(aht.rding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s a i+lc h9gk2w )xaxmzi lg7-5;rt the bottom of a rough, fixer )il9 ah5kwl ic7x;mg+x2g-zd 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 bo:9s1ocnh* oey*tka-br+m z r 5ttom of a rough, fixed inclined plane. The box slides with constant rnmc:+obot-ae*shr 9 51* zykacceleration 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 starting from rest, along ahza 7la+yhrw(8 :p5 dmt37ibn 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 dist: a p+bz757rl wd atinhhm3y8(ance F, what is its speed in terms of B?

  12.07: What is the net forceq j6 ri1u6aqf*;dnka) acting on the object during the time interval of the a u*qia) d1aqkf6 j6;rncceleration?

  12.08: Through what distance does the object move during the time interval of 0hk6 6qlvs/ q n(h z64amnqbh9yw b 31lada:(bthe acsq 3 qb6 mk (bh:9h 410q6aa lnylzhvn/(wadb6celeration

  12.19: The magnitude of the linear momen (4 fhjk i.o2(tsbm.h vp3uc/ytum of a 4.00 kg point mass is changed from 6.00kgt4ch (b 2smhyuovj. f ik.3/p(.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 gains 36.0 J r+d tkmbl7;x ;47uu ktof kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the follo+x;k 7uudl km;4trt b7wing choices best represents the mass of the crate

  94.38: A force F at an angle/4w* ux hxc)um θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coef mxxh4u )*cwu/ficient 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 dnwv 7m1zcd * h30f/gbbelivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant0f1mghb zw v3nb7*/ dc speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface oe2wj;yl g-y4df 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 regye- ;l4wj2yd presents 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 hexsqxf*w98j. si 7w1 oyight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the fo*ixyo7j1w8 qs xf.9s wllowing 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. Tlst /jy+ bsb(+he driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is +tyl+b js(/sb the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformlywn;v/ vjdq ;z4 until it stops. If the ball travels 15 meters, what was the average ne/ ;vqz4dwj;nv t force applied while it was coming to a stop?

  02.26: Consider two laby;a flr9mwl3 xe+ jh a69pv;8poratory carts of different masses but identical kinetic energies arl;wf jm;9h + ealp vy38x96pand 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 vertically in the air with 9txd8z8srtbk e6clk84x:jy+ an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reac6 t4+t zj e:brx8ysckd9xkl 88hes its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary ;;pwd qv, os;econcrete surface. The boy, of mass M, leaves the coe; wq;vdsp;, oncrete 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 dropped frob.a 9; )l9f5qdpq/mww bb m9ram 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, wd5r.f b) q9;m/qaamp9b lw9bw hat 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 dropped from aheigs l, s blc3nnvldv6/dcd.9a3 4ht H above the ground. The object bounces off of a horizontal surface in a coll3bdn/ ,da c9ssn4 v. dl3llv6cision 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 p:4s+qmlkamo ps0/v.n 9yl /;g7kcr rsideways until the cord makes an angle 9yp/c; skp v74.km+:qnr llr a/sgom0
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 uf84sen9v.n k e7p:men4/;ki vjzpw c.niform incline of 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 or;vk 49:8/njwi fp7 eckvz pnm .4e.nseiginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp tx(m6k je.ujb fl,h9 y9o a loading dock, which is 1.5 meters above the sid,x9 fjhjbke .y69ml( uewalk. 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 q3rcdy84gtuz83* y:uian v 4w=50N (as 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 followiw 3u y zd4u*q4t3y:nr8cv agi8ng choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowlp u.ot8y3 nw1eing balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropwyp13t.n 8oe uped 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 with an initial nonsatk/z),x. ct 0zdy.s -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 0.5M rise above the launch point? Ignore air resi, ssk0a .t/c.zzt)xd ystance.

  96.20: A force of 10 N stretches a spring thasx)rhyus7 s o.0blj19 t has a spring constant of 20 N/m. The potential energy stored in t1hy ) o ubjx709ssrs.lhe spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum sh)lhrng )z ;c(peed it can impart to anh z))lc(gr;h 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of ; +dq8 bu34v1qlop* deivn,wle -vei0a fixed incline of height H. A person decides to push the object up the incline in ;18l nbov uie,43p v0dq-dwe iv+e*qlone 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 incline and the object for both trials.