97.01: A force F directed at an angle of θ above the horizonrki f lvgdx4rnn2 *z 0tp863j5tal is used to pull a crate a distance D across a level fljzr60k*l 84nix3d2fr 5 gtpnv oor. The work done by the force F is

  97.33: A softball player catchesjno+pq 6llref5 igi9 *;0gf u( a ball of mass m, 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 ball by her; gueo(il5l6j qf +n*9fp0igr hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wabpx cx*9(dd fci;5)f pllboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex p dixf(fpc*5) c9x;bdpended on the wallboard?

  17.11: A 5.00 kg blo wef 7i(u8n0rdv1r 9 )nwesso/ck slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s 9w eon/d s10r7f()n ivws u8erkinetic 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 onm zzdg,6ihbqh a)/kdab3s7 x-hm0 ,4u a horizontal surface for 5.00 s. The block’s kinetic energ ,q a/-mgihu,hz4x3k 0hb)b d7mdsz6ay 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 a 3.0 kg block fobb v(jv+smp5 *r 5.0 s. The block was initially at rest and slides on a hor( +5*msvbbvjp izontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force direc i7,2*cf gyge z2nvb0pted to the right is exerted on a 3.0 kg block for 5.0 s. The block was in*g0c nfe2vpz i,72g ybitially 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 t. hwk 64gd2jo lxo2jqg-egq:8hrows a 1 kg hammer in one direction. After the throw, the hammer moves off in one dirk2 8:hw-xg g2jqdel6q4oojg .ection while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the aik d)j,0e.mgexl +6ixpr and gives it kinetic energy. An hour after the fan has b0ixxe+mjk6gd, el .)peen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a poslu1;o ia r 7rn/gri q-uxj;8* 7f-m7odgrin2kition of 3.0 m, a speed of 4.0 m/s, and an accelera-n - 8r7xl2iqgoria/rg771f;o;u n djki mr *ution of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooknbv:*z19 c wwsvq+* fvs is on the middle 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, how much work does he do onwbc*nv fs*w1:v 9zv q+ the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) qt,mmzt+vxg*zec1 4) of power to a z xm*)ev,gc4z1tt +qm 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 right, a box moves with speed 5.004au0b8 fysdxz67tf.s mvjc3st6 5 ge0 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 reachesv m 0sft.z6e d xtyacgu6b780345fs js 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 5.3wm,yl ge sk;ip8)ki.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 pushi;wg3l,spe.8i mky k)ed 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 fromzw1 5(yv1qc(3r fpal;yqnph8 rest, along a straight road. CarA has twice thrn( w3vq(yp f1h 1az5q;p cl8ye 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 int9do6leu1b7) uc,gg.7m ndc ad-:mxym erval of the amy- 7m e6 c. gudmn,c7xb9 dld:)augo1cceleration?

  12.08: Through what distance does the object move during the st h9uc7ndu ,v.l 6m3 ey +)qzh-pdo+mtime interval of the ml tmc6.,h+)v3su-d nophd+7uy qe9zacceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed f qn*4m+6vg9hu pf lm9vrom 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is t9hp um64m*9lg vf +qnvhe 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 incre1 h1oi(6edv dyd5l8y eased from l6h y 1i5dddv81oye(e2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ abo prq4- +md,5siu: +gj)flruydve the 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 f+:4 rip+-s yd5 uju,rq)dlmgand the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivc 8nabu h7+v1mers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block 8mavnhc+u7b1 ?

  12.18: A 1.00 kg object ist,:h/;oq rxf 9boi;ol, , qiayl :f7xm released from rest near the surface of the Earth, the gravitational fo,f rx,:ltqa;m, iblf y7i/9qh;x:o oorce 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 by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is :s8hve jvi5a.;(wfy yheld 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 betwes;h( 58i. jy:yvwa vfeen 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. If v hd0 ,ianbi*1the car takes 95 meters to come to rest, windia1b *h,v0hat is the magnitude 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 sto veo.5i;uk9bn))g b cdps. If the ball travels 15 meters, what was the average net force applied while it was coming tono.;9cibb)g ve)d 5u k a stop?

  02.26: Consider two laboratory carts1 k*2j68omzarvif m8js -q3 oc of different masses but identical kinetic energies and tmkm8cj is1 f3z*j o-o2a 68vqrhe three following 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 verti1lo s u-xr,.m:tvv,d xwzh (z*cally in the air with an initial speed of 4.60 m/s. Ignoring air resistan-shxmox,. wt(vu d, l*r1zz v:ce, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u2 m0qn*i ym;gipward from a flat, stationary concrete surface. Th mmy0iq;i*gn2e 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obj5 4cqc k j+f)wqyq j,-lth76ghect crashes into some soft earthwj 5q+7)cct kjh,lqfg-qy4h 6 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 force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M i;of tf)c w(*2tuejf tjp1(-ni s 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 up;ft*utw1)-(jjc tfn2 eo fpi(ward 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 mongfsffx v;x8n)22a ll -rl,(f2 3bzgbl a cord length L is pulled sideways until the cord makes an al-vgnz 2arf,2f(fs)f b xll;b82glx3ngle
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, u(bgrl2;r z:2q lsp)e 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's2rlz)l q:surb (;2g pe speed 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 10-meter d+,wruz( z;j nramp 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 loading dock?+rzdw;ujn, (z

  12.16: A constant force F=50N (as shown in the figure) is appvf*. ug p)1dv7gv2nsi lied 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 si )7 vupvgv2g1nd* .fbox for the motion?

  04.48: Two identical bowling ba 049ee8ayl ebclls 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 strikes the ground, how are the mechanical eneeba8cey e049 lrgies of the two balls changing?

  11.28: A person throws an object of mass M straight upward uasn6 xew:,7mwith 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 maximum height does the object of mass 0.5M rise above the launch point? Ignore air am w7nu6e,sx: resistance.

  96.20: A force of 10 N stretches a spring thatit+x4q-ehl 2t has a spring constant of 20 N/m. The potentiaq4xtt2e+ -hlil energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wha-xp4 9kulc (qut5ao/nt is the maximum speed it can impart to au( op5laqk9t/nu- cx 4 2.0-kg object ?

  

  10.31: An object of mass M starts from ,l92p;du *p)l+onkfi 2hyu ij5udl8 jrest 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 compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object uuh;8ydn 2kj+ ,2l)i9 *l5jdlpo uipffor both trials.