97.01: A force F directed (lmx -knw,8v/2ytbn9p(v tds 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/ t,kn v2 8s9vlp wdyx(tm(nb- is

  97.33: A softball player catches a ball of mass m, which is mmfceouph3 p.90m im2 3oving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuupeo3 3 m9 mic.0mhf2pming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallbov 1l 6lnvicfqfy j61,8ard 3 meter above l6fnqvfcj i 1y8v,1l 6the 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 acceleration on a horizontal suzmr2dea1a8w cf-i/)c rface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J /mwz i fa)cr2-8a1decto 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 a3mb t+l-zn k5icceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.t 3z-5nmil+kb0 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 right3 sljech 84; a1r)a2ksdawvu + is exerted on a 3.0 kg block for 5.0 s. The 8a2ur shsj1k)vla ;4ea+wdc3block 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 right is exerted on a 3.0 kg block foxz4l:qqga9* e , sc4ngr 5.0 s. The block was initially at rest and sl:c9,slq exg a*ngz44q ides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiallys/8bc b8d s8sy at reston a frictionless frozen 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 folls bb8sy8 /8dscowing correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour :z b.mj*j,al5uvem r8 ,s3mbw after the fan has been turned as * .b3 j:vmzuj, w5emlm,8rboff,
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 of 3.0 m, ae;e3r b4uy8z moex6 amsj32,r speed of 4.0 m/s, and an xsomj2mz reu6r3e ,8 ;ae3y4bacceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is 6tk i3 fevzk .srt2x4s.ae..zon the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to ik3za.. 6z ve xs.kesr42ft.tthe shelf that is 2.6 m from 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 24,000,9nu7x a 3 9ieqdwemr( watts (about 32 horsepower) of power to a car's driving wheels. Iax (,ed9q9nwr 7 euim3f 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 th*gk fiz hzkmf/1wlg51 :w+pf zw1)k+ae right, a box moves 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 of 2.50 m/swhen it reaches the top of the+*1k) whfz+g pwka 5 g kw1fz1m:izl/f 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 movesx3k/ g8cp-izw we9 //tieat:ycnyh .( 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./kwy:(/ .ce8n/w tc3 ai x9ipheg-zyt0 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, eac q3pt34b3;i:csup iyn h starting from 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 traveled the same distance F, what is its speed in termsn33qipy:s tc; 4u3ipb of B?

  12.07: What is the net force acting on the object during the time ingj aa 4u39p+rnterval of the accele4jp9nag a3 +urration?

  12.08: Through what distance does the object move during the +r ;q1osyrsff sl3txgn f34,3time interval of the asrgsq snffx4 ;y+tr,3f13 o 3lcceleration

  12.19: The magnitude of the lo5hz:,ax 0d1r bt8g5v dfr-x: (xmbqqu 4zaq7inear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in x ( o0fhuxdr-a,5b4db8 qxq:v51qzzr7ma :gta time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whil45pc/mtjum 2 (ni,zq3alk1o we its speed is increased from 2.00m/s to 4.00m/s. Which one olqma(z 1ic /mok3nu p5t42,wjf the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pu eklnc.i ae(77ll a heavy suitcase of weight mga distance d along a level floor at constant velocity. The.7l7akc ee( in 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 outputxf.j0 2wrl7.lr-a ygqv +ek5d of 0.10 w to raise a block vertically atyk 0 gajl.lwdr2v 7-+f5qe.rx a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objectm a o2k4jiaz7/g gnz6vpnlsix .;z-7l 88+d fr is released 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 groulgxvzpil/gs6j azd ozmrn8.ni78 a27-f;4+knd, 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 balna.k,, ,/wr kk cbzw8;ttfz 9jl is held motionless a height ho above a hard floor and released. Assuming that the collision with the f,/ z8, k;,t 9tkrfjwczaw.b nkloor is 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 barrier ahe er*ku vafv*3oa9.d4dad. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force ndo ad4 e39fkavu*vr*.ecessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slow-mg0r)ot fom+s down uniformly until it stops. If the m)gr +tmo 0of-ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two lzu7ng7gnk9l n/dl w)yt 1+yp* aboratory carts of different masses but identical kinetic energies and the three follo n y u*dyn+7tgl91nwgpz)lk7/ wing 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 clayse)ja19ap6p /miu d.2hf:bdlk mf-j 7 is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it hmi:9lsk1/p7f- 2b eda.)fdp aj6jmureaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrne,ccj( a2 y/vete 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 th2/na yv(j ecc,e 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 aheight r3ky)g,vxv+ dt33dizstl; 0fH 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 th30)tt3yd gvl;+f3i rkdzvxs , e magnitude of the average constant 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 ground. Ty95w /ru;rta,ga lf .k0ra 5hyhe 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 t/rfyaya0.rwl5; ,u9th 5ga krhe 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 lenyli88xy j:gu l*m;y .38u memqgth L is pulled sideways until the cord makes an angl8xjmu ymeyiluyq8m g*l;38.: e
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 upw7 k,qxm o37db a uniform incline of 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 original position at the bottom of the hom73b,7w d xqkill?

  06.09: A deliveryman moves 10 cart,mcqx)*yxt l3 ons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters ay*qt, cx)lm 3xbove 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) is applied for the 6.ade:pa8v g-f-*y (huk mnjax*b 6fw(: 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 bv* (n k(ay-8g:edxj*6 w ff:m-p ahubay the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppez)x s yshke5o vdw3uuf3g(87qb;k 0+ od 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 balls chkukod g7bux03 s5)qof (se;83v yhz w+anging?

  11.28: A person throws an object of mass M straight kd x j6tko5by*yx.acub2/c-1l) v1dq upward with 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 initia5b .y1 6dvu21qc)dx/xl ktjbcyok-*al 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 spggq 9 (7yyc(s wunzc30ring constant of 20 N/m. The potenti(ys(wzn970 3y gcg qcual energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum10/i3mn2ge dwwq8m nv speed it can iw qe0mn dg3vi/wmn218mpart to a 2.0-kg object ?

  

  10.31: An object of mass M g n+7yt5zcguem5 thd/ 22)oigstarts 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 friction between the ) nih +2d 57tztgce5g/y2mogu incline and the object for both trials.