97.01: A force F directed at an angle2a) .o5 kjpxkm yn;d1x of θ above the horizontal is used to pull a crdj 25mkyon.x 1pkxa ;)ate a distance 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 is moving toward h,a8a5pl f k a/o7zqb*her witha/l8o,ha5kz 7abfpq* horizontal speed v. While bringing the ball 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;m7/bakam: /vpx4 kdy sheet of wallboard 3 meter abokb mm/ay 4:akdp;7/vxve the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerat za37n82 b oqcine-4luion on a horizontal surface for 5.00 s. The bl z8e i u-7blnaqo2n43cock’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 acceleratii(n xo-oii (fu8t7i h*on on a horizontal surface for 5.00 f(nh*iio xito8 (7ui -s. The block’s kinetic energy 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 toccb) w2r,kc* :w i;soo: zjzd5 the right is exerted on a 3.0 kg block for 5.0 s. The block was initiaci5co ; dz:s*owzk2)cwj b:,rlly 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 + um n)9och8ftdirected to the right is exerted on a 3.0 kg block for 5.0 s. The block w)u89 mfnho+ct as 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 v9ms+ey0ds4 ffrozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in onyd sms0vf +e49e 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. An houcd2l:3:k.nj9kav7 w g mq 4;fwd 5iqxur after the fan has been tum:c.q2 5 4vlfgu7kx 3aj9;dwqwk:i d nrned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block ofe sih*5p0p l.v mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration *ph0vl ipes5. 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 rno9ih;ffj ebdt-vz91e 7,e4 the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from 7e;oe9f9d 4r1tv fbi-nejh z, 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 2v vrk; 5jws n tzu-or;*p9i4qx,1lx5d4,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constanx5wrkx;q *4u1-riv9 so vjtpz ,5;n dlt 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 speed 5.00 m/s at the bo7rx-nlf 3p yz3/dn9ejttom of a rough, fixed inclined plane. The box slides with constant acceleration to the top ofl9 z/rnj pfed37xyn3 - 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 speed 5.00 m-8c0 3n7 hxwk7fp szl4)qekffal2mq 9/s at the bottom of a rough, fixemkz )s8kl-l73qa 9peh nxff0q fc4w2 7d 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 2.50 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 straighto-hoj +x5nn l9fe8ut; road.ojf-9ul +;nnt85o h ex CarA 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 ( r*avtjh;) ys ak.9fiobject during the time interval of the accel ya.9s ;t(rkj*hvaf i)eration?

  12.08: Through what distance does the object move during the time interval ote9ju/ xq b/u3xl ,kw+sxf,d ji/i9*h f the acc s,kxju3,x*biix/ uw/qfel9+ h9j/ tdeleration

  12.19: The magnitude of the linea-ap92wybpdwc./e p)se 3 lz-yr 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 tdbse yl3- ey.w/2 9-)pp wpczahe change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kineti)) xy1t 9fjk4pqty( dlc energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the folty)kqp x(l4j9 dt 1f)ylowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizont46mvndn n9 i8ual is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betwi4 mnn96vnud 8een the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exertsqhs 3dv plb/q,r c ;l17fuh8t2 an upward force and delivers a useful power output of 0.10 w to raise a block vertical l7s8;duh3qhc pt1lvb/q ,r2f 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 fro4l8ushrvf; , gm rest 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 objectu,hlvfs 48 g;r 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 pozv 0k;ng,e 8,ovgp.held 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 total energy E of the ball and its height h abov. ,0ekp;nopg8g,ozv ve the surface?

  07.06: A 500-kg car is movin9th sn/ /ialj4g at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average it 9nsh/ /a4jlnet force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. trg c-(g4sft+ x 00,jud +tcmhIf the ball travels 15 meters, +4 rdgxmtg(-0fj+th cc t,0suwhat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masw 2it:ef(qc6 v 3gh;yoses but identical kinetic energies and the three following statements. Which of the above statements would be correc owc :y;f2e(h6 3vtiqgt?
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 hfk ;wc9ez1,c in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when hk9z 1,ccew;f it reaches its highest point?

  06.20: A boy jumps from remsb5ysifaw)d i t4cu26 y /r -.0wv4list straight 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 distv0a2bic6uy/r t4.)4 ifwwsmydl i-5sance 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 isko o3a*ud+occ;o. a0h 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 conk*h ao 0cc ;.3+adoooustant 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 d +tckte -u+4*tcu2s8-ksoqn ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a mantt4- ktcq 2s-8+ uscuo k+*edximum 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 is pulled sideways ,hxw8( +;pmxemcv l7r until the cord makes whe,ml;xxc 8v( +m7pr 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 ofm11 tv/jwlh 7u 5ab0cw 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 when it returns to its originahlcbam/05 w17u1v jwtl position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-mete ,u -bpr3p.k+lesi:st8b two 2r 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 l3,r:s2+o b.utpi8ek p s b-twthe loading dock?

  12.16: A constant force F=50N (as shown in the figubd-jtuxo305) ritmb7,bk t- zre) is applied for the 6.0 meter motion of the box upward along the incline. The mass ojm50u)xtir-,kb 7-tz t3 bdobf 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 bowli:gd)td t *qjrhc782 mqng balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball qmqh 8 )gjdt 2c*:r7tdB. 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 mj, nf7cvfk;u1b ;a ) kdg3ip)wass M straight upward with an initial non-zero speed v. The object rises to a maximum height H abovejvpw 3i1f k);)au;gb,dn kc 7f 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a sprin23bas 0elp)t-xxg4 f k+ag)t eg constant of 20 N/m. Th 2t+sx0fa)t-l 4gb e)3gakpxee potential energy stored in the spring is:

  97.10: A compressed spring has 16 Jgn8tg5.i8j rf(l;rmo of potential energy. What is the maximum spe. g gomn(8fr8;jtrli 5ed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom hcrot.ir m p-3;e4zr 4of 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 r .ze-i4c;mr4tr ho3pthe 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.