97.01: A force F direcu59yu 9w6yz cj w;xb7cted at an angle of θ above the horizontal is used to pull a crate a distance D acrossycwy659b c9wu7 z ;jux a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, wrsi-: 7xmoek a+f ayy7zo -:b*hich is moving toward her with horizontal speed v. While bringing the ball to a-y 7 :are-:ziky+*sobo7 mxfrest, 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 sheet of wallboard 3 meter a 4e sc9x 7hitjie4i3r)bove the floor for 4 seconds. During these 4 secondshow93i e xrcih4e4)j 7tsi much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accexcf jd0ld .82rleration on a horizontal surface for 5.00 s. The block’s ki.lfcdx d0j82r netic 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 acceleravda0z.foe p:t c:(1gn tion on a horizontal surface foed c0o(.::nvzf ag1pt r 5.00 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 to the right is exerted on a 3.01yzdkkdu t 2:9 kg block for 5.kk2y:19dt du z0 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 b4 z gz1if+l8lright is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfal841 lf+bzzg ice.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at rkrvoi+o 4-,c feston a frictionless frozen pond throws a 1 kg hamm -+c ro,ivfko4er 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 describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the fn 3qy+q,h h+jlan has beenh+h+3 nyl qj,q 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 an80k,fw;e qtj position of 3.0 m, a speed of 4.0 m/s, and an accelerakw f80n ;jq,tetion of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is ofnlmg k8e3b0 z/m-)sgn 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 on the box. The box has a mass o0f /szg8b3nmgk)el- mf 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (aboul)*j;1hs1u gvip aj 2ft 32 horsepower) 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 magnitude1fgu2v1 * )apjsihjl ; of the retarding force acting on the car?

  09.13: In the figure to the right, a box mov,ci1lju)755 mckv21eviszij ywt 1;d:ggf1mes 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of5isy 7mj wl e1ggcv1:m;i5i 1 )zkd,cv t1u2fj 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/s at aw ws-*u/p1.vupyv.xthe 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 = v.1*/xp. pvuwwuya s- 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 frlr-9q lu)..xx l2gq ghom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has qr29)-l.hqgg l x.luxtraveled the same distance F, what is its speed in terms of B?

  12.07: What is the nem uk7rdc,; +kg/w(j bot force acting on the object during the time interval of tukj w/( r+ck g7od;b,mhe acceleration?

  12.08: Through what distance does t n.6-zrgyx9mp he object move during the time interval of the accele z6-9npxyrg m.ration

  12.19: The magnitude of the line)r v7 p(rbhocbb;w-g9 ar 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 the change irbc7w9(rb)-po b hgv ;n 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 increasedxly lg(v1/obuccj4o00 , cyp / from 2.00m/s to 4.00m/s. Which one of t/(0pyjo4/ l bl1,xcv gcy0oc uhe following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hor:8 )vme se1 qttzn3a7kizontal is used to pull a heavy suitcase of weight m:mae)7s8t q3 nkv1zte ga 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 wqxcx on-au9fk/ 8,e :useful power output of 0.10 w to raise a block vertically at a c u ,8w-ckoqfnx/a9ex: onstant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is release wsru9+wuc7rt;rp )3ld from 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 choicerlr+uw9r;pwcu s )t37s 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 motionless a height hz4d37.k cbi j+kf 0v-y * jmrxvte;3sao above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the rela.cyje; tx4kb+j0rd -as*mvzvf7k33 i tionship 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 d/ ascdqe.- ncz jb+;6mriver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net for j bqzac;-dmn/.es+ 6cce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s e;kxqq q.trps,le .9/,xgn 1z slows down uniformly until it stops. If the ball travels 15 meters, whatg.q;,t zq rx,1e xlk9pen./ qs was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identicly2(r g7vtpm4- )vuhj al kinetic energies and the three following statements. Which of the above sv 2t v-7jy 4l()prhugmtatements 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 alm0l n4yrw/n u1.ixm.ir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest 4lu.l 1wixm.0n /nmyr point?

  06.20: A boy jumps from rest straight upwamvjh*, x +w8v-y(lynq rd from a flat, stationary concrete surface. The vlvj* +xn-y w8q hm,(yboy, 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 g 2j g1uhwj7(3so;wzzs n9.fd*as8hwis 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 constant force exerted by the ground on t j.; ogn*s8 (s 9ws1zw7z3huh jadg2fwhe object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The objeqco9 )np( iwxt.xp +x4ct bounces off of a horizontal surface in a collision lasting time T. The object then rw )cqt4(.io 9x+pn xpxises upward 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 mon a cord length L is pulled sideways until wd)f1anxq /cay/9k -z the cord makes ayk/z)1fqaw dcx-n a /9n 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 angst/c uf,ipm 7z d-x:s*le. 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 dowpc izs-,uf*/ 7tsdxm:n 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 fromn-4f(b awyt 8nywy w22 the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each cartonwy2wa (8b2-4yfytnn w 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) is applied a7 s(m3(qrbw cfor 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 bo3 w7sqm brc((ax for the motion?

  04.48: Two identical bowling j;ob0-wlrzlzjj b hq 0od0 2m -6m5m-wballs 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 mbldm2;qz-6w morh50-l j -m oz0bwj0 jechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-ljj s4txcttt8456;dbzero 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 t dslxttj4t 584jc;b60.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring t 9-u+qmv se9a+za6q*mz c t.gyhat has a spring constant of 20 N/m. The poa99-ts+m qcauzq+6* . ve zygmtential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the mw,roo(fqgpxble 5;q6l 5q82maximum speeoq(5gml25b6ofeprl ;, wqxq 8d it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M cezv)rej1 (k;b*.gjb starts 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 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 frictioj(gcjv.e bbk1 )z;*re n between the incline and the object for both trials.