97.01: A force F directbtwxc0r 7 . 7ss0ivru+ed at an angle of θ above the horizontal is used to pull a crate a distance .w tr+r7x vs0i0b7usc D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which isdr 1go1f,b)ec moving toward her with horizontal speed v. While bringing the ball to,1 e c)brofdg1 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 sheet of wqo /gljlk83tvk ga+;k+q,b* fallboard 3 meter above the floor for 4 seconds. During these 4 secondshow /3bvgqjk t 8;qla l okk+fg,+*much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with ut9i t p1*ol+u0u4j--ubg + subfe-qj uniform acceleration on a horizontal surface for 5.00 puj9+utqf-0g j 4+*-ube bulsi-1ot us. 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 slidesm f;hwz;d+ (,n -ba9gy1 bwnkx 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;h1+bd(,-x9m; yzw nbwfknga 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 the rightq miidk6t,p7mo1ikr)9- go) e)5n sp k is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal -nde 5kikpr1i9k6m p) ,ioo)sqm 7gt)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 fnrv4u6r. x nn:7mp3mvor 5.0 s. The block was initially at rest and :vx mnv.u4r n3n7rpm6slides 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 friwck o09 9ihaf88 yh8rlctionless frozen 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 othe lf9 k8irhhwa98 y8c0or direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air andj7)+h+y a z-v)hevejx9 jlf/ m gives it kinetic energy. An hour after the fanmej zvah+9 j fh-yv7/+ lxej)) 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 kgh0: 6io s oyg)aqu2g)t has a position of 3.0 m, a speed of 4.0 m/s, and an acceleru yo:aq6 2gtg)0hosi )ation 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 fw x pbha8sf oar.6v6s)8) 1pkcrom 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 bso)rs1cpakb6f6w) p a8h x8v.ox has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of powejlbsr cv8kzhu ve3 y4.i/s. 11r to 4.s c vvrkejuls/b3 z1i .hy18a 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 car?

  09.13: In the figure to the rigyg t**z0w2eas)d*zubht, 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 di0*z*bg2z t)awudsy e*rectly 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 bo1n3y(o7x/glhu zmi s.en/ *h qx 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, of mass m= 20.0 kg, has a speed of 2.5(lzxyn/g q ush.m*i1 e37ho/n0 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 fromp+c5ym eeev64b dq3 madm5 r)wg7h: zz27hvf: rest, along a straight road. CarA 4cfw+ zy:vree m p2553e7zvdmda)hh7: 6gbq m 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 acting on the object during the time i k0 kjccu+.ujv;4gq y+nterval of they+4;gkqj juk0 cuv.c + acceleration?

  12.08: Through what distance doey 16a q.tbq2ems the object move during the time interval of the accel2yqmq .t 6ab1eeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chn/sro i8.r mt:tyd 3/kanged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is:/ o8dmtt3y.rs/nk i r the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kitsoa w9,1 opx6 .-mi qny5;;t /guujcgnetic energy while its speed is increased from 2.00m/s to 4.j;ysn ug1ua.-,pgq o o5 69twi/cmxt ;00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the h7nrbbhbar n.l (bq39- orizontal is used to pull 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 l.rbbbaq7h b(n rn 39-the frictional force is:

  14.31: A toy crane exert7tzt7i rixc(.*pnv y8s an upward force and delivers a useful power output of 0.10 w to raise a block vertical7v z t.ty*i7icpx(nr8 ly 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 surfcu60o +dhv8 vmhj w*cw8t1ys1ace 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 fs tyvd811uo 6vhmh8 *jwc0+w collowing 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 heldw,s/b5 r8enwy: qn/ yh motionless a height 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 between the tota/ r/ b5w8n,wye snh:qyl 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. Ifqkj -kb+4jmnd) woo08 the car takes 95 meters to come to rest, what qkk on0j4bjmwd 8o)-+ is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowb (si3j8kw 2-g;cigoes down uniformly until it stops. If the ball travels 15 meters, what was the averagji3gcoe -;bg k(iw8s2e net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mass t+ah1s;g539nwxvmn y)y)gfres but identical kinetic energies and the three following statements. Which of the above statements would be cortyg) sfxn+m;1an9gy ) h3vr5w rect?
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 9g mv zukg-t(h10c*j qclay 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 reache1hgktu-j 0 zv qg(m*c9s its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stawxbkne ukp+g.wz/l30 ,ctw6z bwje9;1-sqf;tionary 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 forcefwp. eus k3/b6l+z019x c;t,wnew;zwq gk b-j 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 aheightH above the ground. The ds,qr,x5 qiz tca3q t tg5a*v) /g:n;wii8t: qobject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that aiazq3 ct q r/)g;8: qdvi,,tn5itxq wai :t*5gsr 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 abovem,kp;w 89z 2ah;z.fssz 1nbny the ground. The 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 the average net force acting on the mass during the collision wit2,n1nzms f;b;yh9azs k pw 8.zh the surface?

  96.38: A pendulum bob maq.m yekbs4 9ke +z,,apss mon a cord length L is pulled sideways until the cord makes mse .qpk, z4k9ae+b y,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 inclin,kuqa1teg8;tcp h) / jmn.g3we 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 wh/tp kt j)3ne mu,wa.qh 1;gg8cen it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartono-8d;itn dk m6kj4xx;s from the sidewalk, along a 10-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 t 8-;6jdxdtmonk xi4; khe deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) m 4fji.6 b:j8uv2hnx iis 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 ofn2 . v8fmj6hiu4jx: bi the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowlingfglpsmq zt 2x 001c i34jr+*dn balls A and 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 strik 32crim xld0fz*tgp 0+4jnq1 ses the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an obje,2; a (6jbd l(gx4gex+qt3gx utuuji,ct of mass M 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 mass 0.5M straight upward with initial speed 2v. In terms of H, to what maxim3lb(xq(t2a4j dt ;u6g uxu,ge,xijg+um height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a s 6os:.qwo vr/ipring that has a spring constant of 20 N/m. The poti6o/ wqrs:v o.ential energy stored in the spring is:

  97.10: A compressed spring has 16 J of ponwlbx sa94 98stential energy. What is the maximum speed it can impart to a 2.0-kg obasnx w4lb989sject ?

  

  10.31: An object of mass M sl)v2 /dcl mjl8 dw2erg*3zv9btarts 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 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 comp mll9ljge23dd/*)8rz w2cbv vare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.