97.01: A force F directe5e)eq* med v2td at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F 5)tev qmed*2 eis

  97.33: A softball player catches a ball of mass m, which is moving toward her .h8ge2 prcmi:/iv; zr with horizontal spgrh z/;r :i8cm2. ievpeed 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 a5nse688aqt r k 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these8n arqk 8e65st 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blo 9t3xg; wmm5(qzt;amb ck slides with uniform acceleration on a horizontal surface for 5.00 s. The bxm;tm m;b39tz 5aqw g(lock’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 acceleration o88 :mwqtal8p 9(u+:psju8cf5 b k2awlj2nlwhn a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to5a s2tn9k 2bm88jhw:upuf c 8q8awll+l:j wp( 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 i5+hq5 n n)lpo kj29oqjs exerted on a 3.0 kg block for 5.0 s. The block was innhp 5l)q5njo +9j2 qkoitially 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 ly z1fs7 u:olx2/ 4gyhkg block for 5.0 s. The block was initially at rest and slides on a horizo l u: gf2z7xlso4yy/1hntal 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 ley40pm l ;;5ywi.ute:ud2i;7 4 kjappkp*jb 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 correctly :54 tw; p0 i .;key;l2ue *7pbiypalkpmj4udjdescribes the above situation?

  03.14: A fan blows the air and gives it kinetic krd*i ix-v2yi;vh9eon1 00 m menergy. An hour after the fan has been turne i- ;in2v*01kr9emo0mix dhvyd 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 position w5vix r)b (s3aof 3.0 m, a speed of 4.0 m/s, and anb s3()5aw vxri 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 vcde3/ gbt a.e,vbu,7ilwzv g4:e -:imiddle 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 i-ev etl4 vgbv ,w uic.3e:gda7 b,z/:do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine dimy3op -6 i*hjelivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maji6y* - hiom3pintains 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 5.00 m/s ju n:jp4(t6hfac8j (o7. *xyt;wew qqat 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,7xwyoqnjj;qju f64ett:.hc *(a8pw ( 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 mok 8tobx*3x 3otves 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 oftobk33 t o*8xx 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 straigcz(v3 ur i8.mlht road. 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 om l(i.cr8vu z3f B?

  12.07: What is the ne8 504rf2 da eh8tzdfott force acting on the object during the time interval of the acceler8f2z otaehd5 dt0r f84ation?

  12.08: Through what distance nxki:/*p9fpatwail,a* js*7-n s a8h does the object move during the time interval of the acsa,nk:wx79n ai 8 t-p*/l*iaa*pjsfhceleration

  12.19: The magnitude of the linear momentum of a 4.00 kv6y2vsb/( a jig point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of thv( svj/yi62bae mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whileuvawnrc,tbu;8* / i- u its speed is increased from 2.00m/s to 4.00m/s. Which one ofwc i/, 8a-r;nuuvt b*u the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontwq (r t;9a ys qgbzg7:b3dpxmh746jj +p 5q7vval 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 the frictional f djv;y:m rjp 93zhw g6b7x bgp+5v4qqs7 qa7t(orce is:

  14.31: A toy crane exerts an upward force and deli+ ps*qkuyz;5c vers a useful power output of 0.10 w to raise a block verticall5*pc+s ky;quz y 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 fro*hk2 sx+ 2rzk(lorjb 7m 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 object as it falls 1.00 mto the ground, which one of the following choices best represents the amount of work done by th( 2jhxk kb7zl+o*rr2s e gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor anh;sg) ;e grsh,sob+q2 q grs63d released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total enssggh+ q,r ;)q hbeor3gs2s;6ergy 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. Ix lk9zidqq n y5-o08z:f the car takes 95 meters to come to rest,znl k:q y oz98i-x05dq what 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 jz)t 41u--co0sup,faur8qcf it stops. If the ball travels 15 meters, what was the average net force4tc 8ufu rfz,sop -q)1 -cja0u applied while it was coming to a stop?

  02.26: Consider two laboratory carts of difflh+iuip /n 4d0erent masses but identical kinetic energies and the three following statements. Which of the above statements would4+l ud/0n ihip 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 vertimzbrvqpu l45)p v*zw c(-lw+/cally in the air with an initial speed of 4.60 m/s. Ignoring air resistl(-wwvqzmz pu/p b)*cl4r+ 5vance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight um3- fgzlr:w-b pward 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) betweefzr- mg:-bw l3n the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M:u*e v fafym/p:k -b2q is 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 neku:a ff*- 2/evb pmq:ygligible, 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 Majn.0akk:8u3nvdut n 1e d(r 3 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. What was the magnitude of uvnn(n1 tkd8jra3a kd3:u0.ethe 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 pullmtu /68ybj+x wub4 b j 0lsw)d8s5a9bved sideways until the cord makes an anglevwldxsjb)ywum5 a9j us808bb /b +6t 4
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. 9 nm pqsgg94 bf.k4m,p 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 comesmg.pf4q,g9 sk4m9bnp 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 1x-wqc;mezslt ce a9 -4 j3hrx5mpw880ch+o j )0 cartons 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 k mh8jj5xcl rxoaqtsc 8ww-h)- z ec 439;em0p+g, 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) is applied for ylr 7;mbd c1-oqmo(mgj ) yj+: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 ;(yo1o g)bjqmld7y:crmj m+-represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A andbpjcku :( id1ynigt,s, o,v73 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 energies of the two baluo d p1ycvnbjtsi3(g,i,7k :, ls changing?

  11.28: A person throws an object of mass M straight upward xx+h2 in :5wgy4ftni8qvkp-( with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now thrvhqx- fg ni5nw t(:ik4px2+y8ows 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 stretcheox*jv3oy y06w2 n iu-es a spring that has a spring constant of 20 N/m. The potential energy stored in t*3oxi-nuv2eyw 0 yo6jhe spring is:

  97.10: A compressed spring has 16 J of potential e :0 mvy6fncl7rnergy. What is the maximum speed ifr0 ynlvm7 :c6t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at tsb neu;p8:r rm o8-bz+c- mc2the 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 broz-2 +um;p bm8trc-:8e csnthe object for both trials.