97.01: A force F directed at an angle of θ above the horizon ;+ 9u 6g9cjtnhvpwamx) h7s+ytal is used to pull a crate a dij+huha vpny+ ) 97xw6;st9gcmstance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, ho42 l: 8cwf9ny6w.2 qrer i;qlwx ho(which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming co hx r .8lqlw(oio;nrw:wh6 y4qfc 229enstant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3xttvu9w0 7m4v meter above m 47w9uvvxt0tthe floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sh2ke:u1+mpcdb0 hd 3 klides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in t1deud+0h2h kpb3 ck: mhis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniford68j6zt tslsrv tc3 *1m acceleration on a horizontal surfacelcts68tj*1 dv stzr36 for 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 forqgtup6zj sun18fk13 lnce+pd.f 7 1 ;bce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and s; + 8dsfn. t3n1lkf11 zpb7j6cquugeplides 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. m:4xrru8 j )f0c( gf3kue)uvd0 kg block for 5.0 s. The block was initially at rest and slides o ve3u0))ck( ffdrm grxju4 :u8n 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 frictky6vog.:e)km nrr/ w-q4slm, ionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student movmv.-wr6 slgm:ore4k/yn ,)kqes off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the a-l(qy wox(4 3/c nuphg*nid ummt25t*ir and gives it kinetic energy. An hour after the fan pl(dnty-/htgnm 2mq5ui3c(u*wo * x4has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of )e d 61zvsax-xmass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration 1 v)xd-z6sxaeof $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf iy+, pxs: 2sb5k)z tcasn the bookroom 1.3 m from the floor. If the janitor relocates the box to thebxk)pssy azt2+ :s,c 5 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 watts (about+l(raj2c4den+ g1ynl 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph),4 g+cdjall(yne1n2r + what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a boxye-p+xigg 9r) moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with cong)ri+ pe9yx g-stant 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 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 5.04vp2hzw42 sq*(dmsr t 0 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acc*qt wszvr s m4h(42d2peleration 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 5j khxq 3v h30vgp*j*qrest, 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 t3qjvh0 gkpvh5x *q3 j*raveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object durc +3 :;qsvqvb9-8+w uldp;owzdsnqm7r k)s :hing the time interval of the accevhqdk: rn qss cw +s8ul9p;o;bwm7z:d3-+q )vleration?

  12.08: Through what distance does the object m 5kr3sr,qu1qbt rr vokl06du -am6 c.7ove during the time interval of the acckr5r,tb o0c6uq -as1v6rk7uqld m3r.eleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point masaw8o -slk+ne*s 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 kineowas +ne 8k-l*tic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy wh-:d(4h qrcg waile its speed is increased from 2.00m/s to 4.00m/s. Which one o(c :hwqr-d4ga f 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 pull 2.m/ ljq0 gqy xln)2/qpgjw c:a heavy suitcase of weight mga distance d along a level floor at constant velocity)0mq:ql. lj2cqwn y ggx2 j//p. 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 useful power outp:3g mloni+6::ier ly tut of 0.10 win3l 6::g ril:e+y omt to raise a block vertically 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 releypq6c *oabh7) 1gh+vut2 lzu :ased 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 o to6z va+h )27gcypuu :qhb*1lf 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 held motionless a height5j1uw /nm+k- n/tyboj 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 +t-nbwjkyn /joum / 15E 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 barri (h,- j ui: r)dhzdhayty,vy03er ahead. If the u zt(idhy,y jd-,30 :a) hrhyvcar takes 95 meters to come to rest, 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 untilkg 8k r-q+a:46bnv:si xf4p jv it stops. If the ball travels 15 meters, what was the average net force applied while it was comfgp6q vxkjsni48b4k-:+ra :ving to a stop?

  02.26: Consider two laboratory carbm54:.lei ll sao7d0ots of different masses but identical kinetic energies and the three following statements.a7l . s0l:bd5o4el oim 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 vertically in the air with an initi1:: j c5kjhavur1 ui*6qokjv 4al speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it1oj u:*r 1 q va5vikuckh4j:6j reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, hi*53ipmswt 6(r+e fh stationary concrete surface. The boy, of mass M, leaves the concrete surface5 hhi+(* wfrpms6e t3i 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 aheigh41-kzw l+kwl9 +v *o 4sscp tm4;pkdektH 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 negligiblo+k v*-dep4wk;p 1ktzws s+k4lc4 9lme, 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 f dwt+i: .t qx st7b)lyuk3t7(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 the averagef)xtl3:ti.ytkqs7 7+b( wdut 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 the co qe/z2,n()lj1 rmv5 x/hftr ffrd makel)1f,vht5/r2/mexfn jf zrq(s 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 of unknown angglw3pdzr /8-w+l6yu z) sice0 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 8w0gzu)wz l3 csy6e/r +i -pdlstarting 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 hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ru 00hexqw jlig94e3,gl u5f3z amp to a loading dock, which is 1.5 meters above the sidewalk. If le 40,q9 gg uhie53ujfwl0z 3xeach 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 tyiv1o+abh jj/7.hvf2he figure) is applied 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 box for the mot hi7/+ .ojb1ya2 vfhjvion?

  04.48: Two identical bowling balls A and B are each dropped frm w.v 7ix +wbkv0hvd-8om 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 energiesvk +-vwm wv .7xbi08dh of the two balls changing?

  11.28: A person throws an object of mass M straight upwa;ozffs 1-r9ojrd 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 initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M riser 9;- o1ffozjs above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring t6taqh/lh1(i-1*emgfx,da d chat has a spring constant of 20 N/m. The pot x1 d(q f/megha-ai*thc6dl, 1ential energy stored in the spring is:

  97.10: A compressed spr,l;*tg b u)rn 7xreyh8ing has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object e,7r gh;*x y8nublr)t?

  

  10.31: An object of mazswq z 7x63t,t:lai*bss M 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 wz6, z bts*w:qal7x3itith 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 for both trials.