97.01: A force F directed at an angle of θ above the horizontal is used to . w,pp1,q)wv9ff xcdg pull a crate a distance D across a level floor. The work done dvfw)1fg,p,9 cqw p.xby the force F is

  97.33: A softball player+k 3+ jhxsj/(r:md:uz0vz+,y lxzoyg e)yxm, catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball+,)jom yy0zu+ sv3+,x:mx rgh xzldk:(y /ezj 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 kilogram seck)zbizi5 e*/ pl jci/ -0u7qheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much pz*5cz0e-i )lib7ku /qi/ep cjower was expended on the wallboard?

  17.11: A 5.00 kg block f-x;h5wnv0 tsbjf8vu o0x/1 jslides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J inu x0njtxfvw -vo 51;80f sb/hj this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with unik3le)+he46l/*-:ngvnh)t hkk q c tffform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this elk) fltghh:)6 *khnfkq+c4/ne 3tv- 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 fcrouflsmanyn)+ 4*fe.t *09 rra * 4nf;n9rj oor 5.0 s. The block was initially at rest anu)el;not* r jcr.y449ffoasn mr9n*f ar*0n+ d 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 directer1 agwc-rpfn8 g:r8q3d to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides n3rwraq1r f 8pgg c-:8on 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 frozeeua yjx9l/s3 2n pond throws a 1 kg hammer in one direction. After the throw, the hammer moveuj32 ale/ys x9s 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 aiokp)c4uc)u.d (pg8 u nd gives it kinetic energy. An hour after the fan.uuc84dgukcp)i ) o(p has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0/5ok y/rc .rzsscl i30.50 kg has a position of 3.0 m, a speed of cr5rs izo//.s 3ycl 0k4.0 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 textbo.e1wyb) xhakh v02/y ,ohyb,uoks 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 the box. The box has a mass of 10.0kb.b y xvhhw)aoh1/y 0 uy,,2e kg.

  02.32: An automobile engine delivers 8eqq4qzr4px(xue6 1a 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 magnitude of the retarding force acting on the careq 4pa4(6 1ueqxxq8zr?

  09.13: In the figure to the right, a box moves with spee0gkwmx tq(bp t10kdw fg1-6k2d 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the tog1tw -t6 01gkf0 xbp(qmk wkd2p 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 moveu0cn*x; )sqav,ns8v 6f (xcp ls 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 qs(6xsp0cn)l xuc8;,n* fvav 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 starti (, +omx/yipajng from rest, along a straight road. CarA has twice the acceleration of Carp+yjm aoi,(/x 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 actirpt,vchw+2,kdz -.zuzpb wtm5 3 cc:- ng on the object during the time interval of th,- r,z2ww dtt p:m+b vpz3hkccz5-.uc e acceleration?

  12.08: Through what distance does the ob/ apu) kmx7q(lject move during the time interval of the ac7xlu/q )(pmka celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass pz 4v / vrf(uxp 8g lg0*yt,*4y8cqoezis 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 zv*tf8p8rz go4, l(gue/cv *pq40xyythe mass during this time interval?

  14.11: A crate gains 36.0 J of kinetica sqli0r*0odl zef 31)a:hss/ energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followin0 qlazoh si:0s1 *efdr3)l/as g choices best represents the mass of the crate

  94.38: A force F at an angle θ above the sz(nv+6kk5pj horizontal is used to pull a heavy suitcase of weight mga jkv+pn5( 6z ksdistance 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 andf fib (7jc)l:b delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At w l(fj)bbfci7 :hat constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from qx3yg yz s3+y2 ezo+ a-:r,lxgrest 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 gravitationalqr- 23x : zggs+y,l+yxeaozy 3 force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is hsj butv:av7l7 vo-insgwl (; *w;9 ,saeld motionless a height ho above a hard floor and releasevugwasw:tn-v,j siv9 ;7*l( ;asobl7 d. 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 the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Th 3sq.czct+ vd( ,x2 l7clxjrn;12ahjc.detc0e driver sees a barrier ahead. If the car takesjdtr 7t 2s cjx cncz2cd(hc3lv+0a.xq,.1;le 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;f*9pv sodm h (vlua)9 at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while v;9u*sam(lo9) phdfv it was coming to a stop?

  02.26: Consider two laboratory carts of differen);aqj +vg /djrt masses but identical kinetic energies and the three following statements. Which of the abjv/)a+qr; j gdove 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 cs m zj1suv1t,ni4,e.xlay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what.4 istjv,1,nsex u1z m 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, cbh5hlu3f.o ohr vhp(q:2,:s 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 highest point of the motion. How much physical work did the average normal force of contact (N) between the boyvph3h,:q2h.r l cooh:sub 5f (’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from ahao0)2 wyzk e-teightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a daoye02w -z )tkistance 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 dropped from aheight H above the ground. Thetw k08e0hrvpjklvv: 9425ive object 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 thv5 k8vwjri0h2v 94:vee0lp tk e 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 sideways iyq ep0148vvw until the cord makes ivw0ey8 1vq p4an 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 u4m st7 0efbby:,z i6kbnknown angle. The sled, which started at the bottom of ,7tk:ysb0bbfiez4 6m 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 sidewal )6k c.helx( vhnrr7z2zy793 j1bae4wswsd7 xk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each car(cj7.sskrz72 6xwwxvh9b7zl)nar ydh 3e e14 ton 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 fig)7z5 xq gtxyv6ure) 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 rq7)vz6x5gx yt epresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from b /,xa.bwgsoobcb29-the top of a tall tower. Ball A is dropped one second bcs-o/bx o.9wag2 b b,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 ezdsbk /.nu3d -j0mm.straight 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 mdj/m.z nbk0m.3 uesd-ass 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 m:wkx,fzz nar ;(y r;b11w2bbcf: ;zrstretches a spring that has a spring constant of 20 N/m. The poterff a;rmx;zbky1c,1:nb z ;wz:( bw2rntial energy stored in the spring is:

  97.10: A compressed spring has 16 Jqloc* m1+ee8k8,m :uf7 sr afa of potential energy. What is the maximum speed it can impart to a 2.0-kg objecqk+u8 8,lreom 7:csaafe mf*1t ?

  

  10.31: An object of mass zt1 /ah5 lqge,j7levn f +k+r*M starts 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 shownn ef */qlz,+grl5te+k1ha jv7 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.