97.01: A force F directed at an angl:jh mqsvk26hv+0 (qkj e of θ above the horizontal is used to pull a cra 6q2kv0hj(jqvm:s +k hte a distance D across a level floor. The work done by the force F is

  97.33: A softball player catchlxf5xirql+vvh0l; *ot w ;8a* es a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand movetw0* x5i+l;*qx8vlo avlr fh;s 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 wal xk -uqx8;who 7t:z+rylboard 3 meter above the floor for 4 oh ;-kq8 urx:+ ywtz7xseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides w7r1wdffsj)e8)br(n5s)r1 dugx1 -ou,e stpm ith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2s(pjs5ouuwdb ,)-1gre 18 ) rtx f1edsrfm)7n0.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides witeuj*np.l o( 8stlz4d+h uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasd(ns4plujz.8 oe * +tles 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 cqlq; hsa0h0mag;+l3block for 5.0 s. The block was initially l; h3gqhms0 a +;qalc0at 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 thetcp 0r1gq4tuwcp 20mu7p3ee 3 right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal 200ce c mqtu e g1347pp3wtrpusurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless froze 4mlnp uil.y22n pond throws a 1 kg hammer in one direction. After the throw, the hammer m mnu2i4lp.2ly oves 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 give3m1)znhx n.4i 7ks am k18uuerz ecq+(s it kinetic energy. An hour after the fan has been turned off, k1n zh3mak8(i1)nmu4e c+z 7u .s rxqe
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 ny7y3j 8eoa fdh:.r6b of 3.0 m, a speed of 4.0 m/s,n8y:o7b.y6 rj ad fhe3 and an 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 middle shelf in the boo5c.+wmcd.m2f nsft s.kroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, howd.m5 ts2 ccwnm. f+sf. much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine dec2xcr1+//e xufs /j(;p tovge, d5axilivers 24,000 watts (about 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 magng/sxx1fur,/toi j+p(; v ed c5xa2/ecitude 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 a+1)pg9sytswh t the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of t sp+g9wh1)y tshe 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 5.00 m/s at the bottok db0mko *cu41 trv+0sm of a rough,k4bd 0c1os 0*umv tr+k 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 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 righ c7gc+*l75-dmz :l8u4 pkuilnn8x xval0g8sht, each 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 7l dgn:847l*hlvcaxl8 8sk0 u gnx-icup+ 5zmits speed in terms of B?

  12.07: What is the net force acting(la56zn1ysm+ i 7c zrx on the object during the time interval of the accelz ila(6x5 +7zcr mn1yseration?

  12.08: Through what distance does the objhx i1i. ev plp49l/3tfect move during the time interval of the accelera9.f3 x4pl1hevilp/ it tion

  12.19: The magnitude of txzptpqwix k;02o3f v* a8* y6whe linear 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. Whx0k piw;xvpta3y*62f *zq8ow at 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 while its speedhd94su,ihp8i g 3 qu2wpfa n40 is increased from 2.9hpi wnaiqgu0pf482s dhu 34, 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 above the horizontal is used to pi o k,hte x17ry*mpx ;4in8c 3te86 c9nxars6eull a heavy suitcase of weight mga distance d along a level floor at constant velcx7;1ir86rene hnxk opi cts3x9*e6 a4yt8m ,ocity. 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 del.v4-+cf uhg( xkuas*e(l qpy 9ivers 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 kgf( lka+.*p c9-q suhxvuy 4eg( block?

  12.18: A 1.00 kg object is released from rest near the surface 1lu)e(rj4dqc of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J1 qjld(4 urce) 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 held motionless a3x cg:wss :z(z height ho above a hard floor and released. Assumwxzs: s( 3gcz:ing that the collision with the floor 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 mn- n r1g/v3 ea b)uoo+ti*k,bwoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minrw1v a/-o nbo3gi nut+*k)b,eimum average net force necessary to stop?

  00.26: A 500-gram ball moving avdam7 67; +vxcdoh:zt86 hvmzt 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a sta vx7hz6; m7v8co+dvhdtm 6z :op?

  02.26: Consider two la23p(nifca 1g pboratory carts of different masses but identical kinetic energiesn2a1 cg3(ip fp and the 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 vertically in the air with an initia)g: (du jtyn2iz4oe 4al speed of 4.60 m/s. Igndnyjauo 4:i4eg 2 )t(zoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concret upr: qr0r2i3me 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) between the boy’ s feet a q:rrim3 rp2u0nd the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The objectv-l;+q j0jrx l crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assu0r;xj+ lq-vl jming 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 v1/+ve kvtxhoimz6tea8o 9w ;42p4yn mass M is dropped from aheight H above the ground. The object bounces off of a horizontal surface iy2int 4+ozw9m/a816 voe;vpvxh 4tke n a collision lasting time T. The object then rises 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 le+d* csohwvm y563t)usngth L is pulled sideways until the cord makes an osshuy ctv 36m+w5 )d*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 unm73;: g2zogztxs8w gq iform 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 returnsgwmg38:gz;72 qsox tz to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from th oc ig:9kkk2u:yq( dpt2 wo)5ye sidewalk, along a 10-meter ramp to a lo295:d)o2 wu oykkkp:yg ct(qi ading 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?

  12.16: A constant force F=50N (as shown in the figure) is aphn) f8xjv)m 83caqbtej:1l.pplied for the 6.0 meter motion of the box upward along the incline. The mass of the1 fbv)pjnjq:htxl.83 8am)c e block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are e+5.w.x;-vig*fag*pyy1 la (mhi fvwqach dropped from rest from the top of ag hfp+5gi qw.v-(lv1yym*faxi ;w .* 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 changing?

  11.28: A person throws*2 2vg5nqa:rplp w5b mx, zq+c an object of mass M straight 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+c2 ,pbqw5zrv2ag: mplx n* 5q 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 stretches a p mqa,)q 7iio7 r aq3b+btk.c2re(8vhspring that has a spring constant of 20 N/m. The potential energy b(rh7ac7pt 2. q,)3q+ im qr8oa bvikestored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spe b5wyx l/0wek6ed it c /ewy5lx bkw60an impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest0s5gw93 4wqtxgn ;e pd6)yn ag at the bottom of a fixed incline of height H. A person decides to push the ob9 ngdewwpn gg30 5t)4ax6q;ysject 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 for both trials.