97.01: A force F directed at an ang gak g ,-nwdm0+e08cpxle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the forc,g8 k0xa- 0 pwegcnm+de F is

  97.33: A softball player catches a ball of mass m, which is moving tow r.km)/v*r; qrhp2 sqdard her with horizontal speed v. While bringing the ball to rest, her hand mo;k.q qp) r md*vhsr/r2ves 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 wallboard 3 metert v l0kzrg6x ir ;do8o)6:ajh0 above the floor fo600 :idrg)8vah tj6 ozrl;oxkr 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration o:*g kk8rso z tf-lywv-u26r1j n a horizontal surface for 5.00 s. The block’s kj gzr vo1 -t*ulf r6ws82-k:ykinetic 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 slideewqpjfv 5;2 *lw5 q o.-dnwm3is with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy nwo52.mwveqqdl3fw p 5 *ij-;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 the right is exerted on av cmm(g;qi7gj hc47m 5 3.0 kg block for igj cm;47m(m cv57gq h5.0 s. The block was initially at rest 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 a 3.0 kg block f x)m:q0w d5.jioep 2bgor 5.0 s. The block was initially at rest and slides onpmbe d gi.q2) 50:owjx 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*9 zs f4v;l 9v )7bdmzq nj5jzs-woo;r kg hammer in one direction. After the throw, the hammer moves off in w;l99monobj zz5 j7 rfsz;q*dvv)4-sone 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 and gives it kinetic energy. l bsvnr8c572jn4d-s /yb d tgw/ o.gi86k-xqn An hour after the fan had48sbknd/ gb y8iv/w.-tqx26c-o5 l7nrn gs js been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0v3fm: u+ fs(xnlei- 9j.50 kg has a position of 3.0 m, a speed of 4.0 m/sx:fnm el-9 u3i+s(jvf, 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 textbooks is on the middle shelf in the bookroom 1.3 m cugwwse/ 65,d:l /r *dwhvfi1from the floor. If the janitor relocati e wu :rs/lv15dwgw*,/6d chfes 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 (about 32 horsepower) j(jmjep 9 (er:of power to a car's driving wheels. If the car maintains a constant(j:r (jpem9 je 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 with rn7odjtl2vhf p6 ;7f 1speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top o261vtjf7rldfp ;n h7 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 speed9mrw0 -n )6rfd3b..yblzqh bb 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 n 3 -9mbfh.dw)r6 zbbrl.yq b0m= 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 a straight r* 2pj-vcgj7ek5tw -reoad. CarA has twice tktr*7-gje- j2c5pve whe 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 duringy) d7:khnxv+3pnlx o1 the time interval of the accel 1nky7h):+dv3xlon pxeration?

  12.08: Through what distance does the object move during the timbw ):.ubae h63zzynj:ji mp*f1q: w*m e interval of the accjp*)i uaw 6 wne.hq3j:bf*b:my 1:zzm eleration

  12.19: The magnitude of the linear momentum of a 4.00 )d7k 1nrd qh7.w3 kb7fnn)cdbkg point mass is changed from 6.00kg.m/ d7 n.n7ncqd7f)dbb 3khkr) 1ws 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 of kinetic energy while its speed is increasedka 4 v(7phmv/n from 2.00m/s to 4.00m/s. Which one of the following choic74/ah(p kvvmn es best represents the mass of the crate

  94.38: A force F at an angle θ above tqw*94a:* f ay6yoevfghe 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 the floor vy*yea6*4wa o9gq:ff 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 powekc40lz9cdxf eq5s a94r output of 0.10 w to raise a block vertically at a constant speed. At what constant speed wiledf054kzq4 x9 ccas9l l this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the 4x 1; 95xp qrtfqm60kq-u etdnsurface 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 bq 4-p9dqq1kt tx6fmnx; uer50y 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 heigw7 hd5 iamsj8 +x85medht ho above a hard floor and relea5xh5s8de8ad7i w +mmjsed. 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 x ijh*f 7pi(;oybw.*e at 28 m/s. The driver sees a barrier ahead. If the car takes 95 mete7 f* po;*.b ywejiihx(rs to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mov24jo j qh-772zq aw ff2sckzn3ing at 15 m/s slows down uniformly until it stops. If the ball tfhjqq2n42wzzs j2c7a73 - f koravels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idec7qj(* sy:wzdjc zo py5 j*3h8ntical kinetic energies and the three following statements. Which of the 5djy zcp*q7(y w8 3:jojs*zchabove 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 eo)( f 43t vcl,cvo0s60y ogjzwith an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its hjvof ot4vyccs)l0(z o6 0 3eg,ighest point?

  06.20: A boy jumps from rest straighqup t*nibm:64zn*2 1gwfgo( w t 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 highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the cong4b wg2q(mtzni1opf u :*w*6ncrete do on the boy?

  02.48: An object of mass M is dropped from aheightHju 3kuj2t (uw9epap.- 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 ai -2(aueup jw3t jku9.pr 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 mask 6pnw(hw;z1hwq gh;5s M is dropped from aheight H above 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/2.6;whww hn5;hp1 zqk (g 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 sideways un nx)sct ck95mk 8.z:+dn:or2ku6dqgotil the cord makes a5dkzdcou k2+mn8 s9c qo 6ngk.x::r)t n 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 unknown angle. The sled, which z1k/hwks:ac 5trv;+e,ru jg*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 s*ghk 5/w;t c1+:ua rve,jrkzslides 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 sidewalk7 u7.ae ,gp bzjvc;c59smjof), 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 the deliveryman on the cartons to move them to the loadinv9;mf.g 7cjb aczo) p,jeu57sg dock?

  12.16: A constant force F=50N (as shown in the figury5p8 pylp/pzghzg 0; 2e) 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 the mpgz8y pg/ z ly052;pphotion?

  04.48: Two identical bowling balls A and B are each dropped w 3xxh2wnk*sa .-8jff 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 strikes the ground,3ns2k- x8* jww ahx.ff how are the mechanical energies of the two balls changing?

  11.28: A person throws an object uef q)y*4( p o2(lqlaglu:e.r 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 mas y(.ag)prl:luqe*(e l ufq4o2s 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 stretches a spring that has a spring constant of 20 N/m. 4q e mku88v3 r4kr+wccc;/acx The potenw r/vcrc;u348a c +xmkq4ck 8etial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum shx55v matp62ox((x)gu3ic sd peed it can impart to a 2a 2 (6mc(g xsxdvuio55)3txp h.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of 434, xgwshs/rev tya t( -6mxa0e1qlna 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 inh 6nle/ss34m0ytvgxra4 ( e,-wx1 aqtcline 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.