97.01: A force F directed at an angle o48ouaes6 g, ab, fy8wqf θ above the horizontal is used to pull a crate a distance D acrua,8fo84 q y,ewbg as6oss a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m,je673wlr9i )ny 85 a;yijegfd which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ad3eje8gi jf9il7);5r6nyyw ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter pnqqd40x4 w f)absi9 b1lm0)tabove the floor for 4 seconds. During these 4 seconds0fabb d) tswi4 14l9q qnmp0)xhow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with un+fd ;vc 2xo-xqiform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 df-vo x+ 2cxq;J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides wit r9tgrn *0yb*hh uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreaset* 9hyn0b*rg rs 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 ym(6meg )4rv qforce directed to the right is exerted on a 3.0 kg block for 5.0 s. The blocky 4e6q)v gmrm( 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 righhckm2v+6 z oz/j)ng6q t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest a/ gz)jcv6k6h zmnoq2 +nd 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 o5owz:/ cag .gfrozen 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 other direction. Which of the following correctlzg/wa.5 o:cog y describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An kxc 61s(3wjok8 to6l nhour after the fan has been turned off, k owl368cxnk(sto6 j1
what has happened to the kinetic energy of the air?

  09.05: At an instant uftp8;+ vjrv k8v9od), a block of mass 0.50 kg has a position of 3.0 m, a speed of vj8 9ut8fk)dp+ orv;v 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 textbooks is on the middlewd edj r( z2s8,ae;qf8 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, h;rze8q(e s wfjd8a 2,dow 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 hors .c.vi) g04qrmqngif3 epower) 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 magnn.0gq.4)ciq3i g fvrmitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box b2*y:jf3wqw9t cu0iy moves with speed 5.00 m/s at the bottom of a rou2i :jcw*9y30fbuq wt ygh, 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 incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figurem r -096qbw71o m k+anmkywu:6r qld-u to the right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The mquk1 u7mm :6d9-wow+br rayknl6 q-0 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 2.50 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, feu. g( njkl-ffr-g 3(each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F3l fk((.jgufr fe-g-n , 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 objec2 kct 6l*+b nv5nrh,cut during the time interval of the l2r h cn5k6+cnt*ub v,acceleration?

  12.08: Through what distance does the object move during the time int5iar37* ijdl 4u6t meyerval of the acceleratird6 aj3im4 i5t*7yule on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is cha;;sc gdufrv.1nged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the cfcr1;;g s duv.hange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic/ ).ttyke9ks7 o) pcho,kom6m energy while its speed is increased from 2.00m/s to 4.00m/s. mt9c/t.ks,o ykmh)k e7po 6)o Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hqk 3pdrlru2( 5/ i3am mzoh2-corizontal is used to pull a heavy suim2zr hmpd-ko( 3ur 3ilcq/25atcase 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 frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power wiz316iuzh 8sd vn neg6 2+xl8 s2lu*noutput of 0.10 w to raise36l8d 1w2u *sn86+2izuxiznsglhen v a block vertically 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 restl,y2u 9c:k)r2zuzyhm 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 fallsum9u y2):c2rhzlz,y k 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 motirmmww h;qkw)2mh11n ss ry2 ,(onless a height ho above a hard floor and released. Assuming that the collision with the floor im)mm hww2 s2,hys (r;1 wrnqk1s 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. The driver sees a l5j,bu+j3qbv3xf 2fwx)d lsn.c ys) 0 barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net f33yd)w c v.f,xs)x qs ljl+jn ub05f2borce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. I qaojo..wq)- i7 jwz.loty i*.-q1 myrf the ball travels 15 meters, what was the average net force applied while it zr. y-jjwl.ma q .qqwo7*i.o 1t yo)-iwas coming to a stop?

  02.26: Consider two laboratory cajer0 z s;o 7s.7vm xl/iqn+vi/rts of different masses but identical kinetic energies and the three folloleorvqsmi 7+/. 0jn vi 7xs/;zwing 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 an initial :oa*hr9ro,vm3+ljk -2v 1f3mysh svnspeed of 4.60 m/s. Ignoring air resistance, what is th3a on3:h9-svhsj +m m1of*r,y v l2vkre change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from; wim;2xq9jvk6tc vr( rest straight upward from a flat, stationary concrete surface. The boy, of mass 9j6;;c(2 mtkvxwv irqM, 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the grounds4 ,k ow 9c- dwq (v.k4qksry5+;bqjxz. 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 forqjr(zwc. 59+bsk-sx4kqdy;okvw 4 ,qce exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is drs8eb3,tt ;ezb opped 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. What was the magnitude of the average net force acting on the masbsze ;e8b,t3 ts during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidewanftoxj g91wza 0iy)9tsg.w67 zu)p e/ys until the cord ma)6f t9xye 79p1g)zs / w 0tiuzngojaw.kes 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 incline of unknown angle. The sled, 2xixz5iu1wax 1qmc hc /* +p8hwhich 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 iq /1ip z8wc+xauh xcx*m12 5hmomentarily 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 thm+s n -8d8aeat6 cjo9je sidewalk, along a 10-meter ramp to a loading dock, +sdjacm 86ea8 9tno-j 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 loading dock?

  12.16: A constant force F=50N (as shown in the figure) oh(b( j bvh1b/is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block(h1bojh b b(v/ 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 b8x1;eeug*ms v owling 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 1 *meeu8vsg x;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 o)xk7ydci g/3hqc6+ i non-zero speed v. The object rises to a maximum height H above the launch point. The person n3dcg6c/) y+ i7 ihkqoxow 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 resistance.

  96.20: A force of 10 N sw s:r(2xsbq8 1 *yslojtretches a spring that has a spring constant of 20 N/m. The potential energy stor1b 8: wj lxs2s(o*rysqed in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is 9p azu 0zte;u8the maximum speed it can impart topu9uz ;8a tz0e a 2.0-kg object ?

  

  10.31: An object of mass M star-m:z w9g csio(p(sqg xl4)cp )ts 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:zcspg)wxq)- lc 9mi4sg (po ( 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.