97.01: A force F directed at an angle of θ abc k-3zrb-7 mmc1loo g,ove the horizontal is used to pull a crate a distance D across a level floor. The wo7 rcb1zm3o,oglk- -c mrk done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towyy)y b8ii+9 enard her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. )i in8 yey+b9yAssuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3oks4aiu8j *h4j:dxk2 6zu7or bn m8f: meter above the floor for 4 seconds. During ther idojn8ha jkbo4726 *m: z8sf4x kuu:se 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block mljjw0ua) 1yk0q1wd 7e cn/(rslides with uniform acceleration on a horizontal surf)w7 1 edm00y1 a jlwcn(jk/qruace for 5.00 s. The block’s kinetic 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 slides with uniform acceleration on a ho6 brrs4r 99pco:8i ukzrizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in tobrpr 9u z 9sr48ci:6khis 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 exerted3gmrr8)i 7 tvb06uqx ux ksc27 on a 3.0 kg block for 5.0 s. The block was initially at restumt6xv ukgxb)08 iq3 r s7r27c 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 thefv+.y :bcsgy 0 right is exerted on a 3.0 kg block for 5.0 s. The blocyfbyg0: sv .+ck 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 reston a frictionless frozen pond throws a 1 kg b x;-ydfd2 ,slrii, i0 l(+be5(kfc1iekzrq :hammer in one direction. After the throw, the hammer moves off in one direction while the student moves 2+l dqifrirs by ,lxib5k;-c,: e( efidz(k01 off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gi;y0r/cm2z q jqves it kinetic energy. An hour after the fanq /20q;y czrmj has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blocimfb /b i(bf*+k of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, a / imf*(bi+fbbnd 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 1.3 m fcubn(-,bb/ el ,fdwl8y7*q uqrom the floor. If the janitor relocates the box to the shelf that ifleb /ql- c*,q,d8(ynu wbbu7s 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 horsepower) of poq i,6sh/2uz ao*+z luuwer to a car's driving wheels. If the /h+ *izu zsau2ulqo,6car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves ;f wegb6lw(0 gks2vc0with 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 mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inc0 2 ws g0bve6(gcklf;wline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure ygfeju5wn.pu1,7seis b8 m(,to the 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 being pushed directly to the left with a constant force of F = 240N. The box, ops w7nb5igf1, (,euuj.8 esymf 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 bw 4ss:k9wa;sbs -z+r rest, along a straight road. CarA has twice the acws 4s+ zbb;ss- :krwa9celeration 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 acting on the object duri;awemtzat) kr e :p00y* y7;,bcwnzb +ng the time interval of the aw yn)a0*k7 ta;er ytp,zz:bc 0bwe+;mcceleration?

  12.08: Through what distance does the oww0.mhy)2jn0g5d ey0 vw: giqbject move during the time interval of the acced)q em.w0y2: gv50hj0n iwwgyleration

  12.19: The magnitude of the line5) gt5dof jz qy8wnx9k)tl (r(ar momentum of a 4.00 kg point mass 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 thir5j5n o t9)8t(w( qgk) dyfxzls time interval?

  14.11: A crate gains 36.0 J of kinne tw+zz,cl 5wp- 2hut7-gg l/etic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one 2 hzu/lzg en7wcl5-w,ptg -+tof the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pu;c m-h) 18ogvl u7kwr pc/fu)b)tcy 1zll a heavy suitcase of weight mga 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 )) ccby;-c/ukfr 87 uw 1)plh1ztgovmfrictional force is:

  14.31: A toy crane exerts an upward force6 .r)n/cw 2;wr x* hmyb3kf63wzjyeqk and delivers a useful power output of 0.10 w to raise a block vertically at a co6k*6h 23y/c.jzb wnw kex3frq;)m wrynstant 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 of the;qjc kgi7cv ; 1no q((ttg5tzk+l ic;) Earth, the gravitational force aic+ vc71); l;tqqtkz5((nok;cigj t gcting 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 gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a h sjxy5rl4s5lfjo +/b a .i(d2leight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship bfl(d2i+5 l /rsb.asjy5oljx4etween 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 barrier ahead. Ifn um12zc4m9oe the car takes 95 meters to come to rest, what is the magzm c9oeu 14mn2nitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stopspr urj7pw3* x8. If the ball travels 15 meters, what was the average net force applied while it was coming to axup7 3 pjw8rr* stop?

  02.26: Consider two laboratory carts of different masses but identical k2 d fcmn+.mrxtl7v3(ninetic energies and the three following statements. Which of the above statements would be corretr7f+vl3mn2 nxd(m c.ct?
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 op4 njq)tj6ah 3m6z7m lf clay is tossed vertically 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 ijqn4 t j6a)mp673hz lmts highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary /+gjj r( hiu/gconcrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of m (hjrg/g ij/u+ass 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 mas;y72 2ldqbdx rs M is dropped 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 forcq7rld;y2d b2x e exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dro2cxd-4 9ghh pwpped from aheight H above the ground. The object bounces off of ah4w dgcx9 hp-2 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 mass mon a cord length L ih-t,v vi;t.b ys pulled sideways until the cord makes an t yhv-btv ,;.iangle
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 angle. The sled, whid1zfx 2 aio01ach 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 speeadz fx2i1a0o1d when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 1d k0xgv351by;c2ka 3 gjrla- v0-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 total work done by the deliveryman on the cartons to move them to the loadinkl3 yv rx3kc5ag0 bv g1jad;2-g dock?

  12.16: A constant force F=50N (as shown in the figureq wtym6wz7,ip 2, t*ts) is applied for the 6.0 meter motion of the box upward along the incline. The ts,w z*q7p,ti 6w2ymt 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 and B are each dropped from rest from8)( htc0vxpl ragrd73 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 grgtvr 0 d7(ha8x3crp l)ound, 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 nonj8v;vlg f)j c5-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 ril5v) ;cj8fg vjse above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a fyy.e1bo yf9z. y (3.-uv( 0 xhepwmuwspring that has a spring constant of 20 N/m. The potential energy stored in the s( my.w 3y9e(y-w.fe1bvuopyx f .uzh 0pring is:

  97.10: A compressed spring has 16 J of potentiz plp/slj wf-ig+c,(9al energy. What is the maximum speed it can impart to a 2.0-kg object ?/cflw( gp- 9,+ slpijz

  

  10.31: An object of mass M starts from rest at the bottom of p6wclni, k ;9ua 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 for the two trials? Assume the same constan,6uw9p ilck; nt non- zero coefficient of kinetic friction between the incline and the object for both trials.