97.01: A force F directed at an angle of θ abo ,0rxpaiw))bpoe2z-i jrde,8g oo/ 6uve the horizontal is used to pull a crate a distance D across a level floor. The wz r/ipr2,e)ox-i0odw,ag ) 68p ojbeuork done by the force F is

  97.33: A softball player catches a ball of mass m, wh9zh0.ic(i wgh ich is moving toward her wighic9zwih0( . th horizontal speed 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 a 20 kilogram afk6xaww+7( 8/zasr b sheet of wallboard 3 meter above the ( rwf8aaz7b6 w+/xs akfloor 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 hsosux)(c: +ssurface for ) (:oxusshc s+5.00 s. The block’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 bb*w vp pb v r9eoh6dux;92:elbvq./0 ilock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreas0 .h v /6qv:bibrepe9blo2*x;dpwu v9es 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 onpnl -ui8w o/u-1n+jwi a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfa /iuwui+1nnl8wj-o-p ce.
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 theekb)a;jz-5f(.z;bi t1 - cc izid0fmk right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.1b5 c- ;zzfti0cdk iab ikme)jz. (f;-
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initial4td l0eef1i9 ni.,bsbly at reston a frictionless frozen pond throws a 1 kg hammer in one direction. b1etfln ,e s40id9b .iAfter 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 enerh do , nzvg; y,ec0;0scb3n,h mog)dt5gy. An hour after the fan has been tu,zg0 ty ; cv3d;,)hn,oe 5sdmbcno0ghrned 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 of 3.0 m, a speelb4 nssk g-7.c o8tpy0d of 4.0ng48p-b. ycsk o7lt 0s m/s, 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 thu2e)*b5 nyqw0hlx9r1tx6 rc( l f8oube middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to th6rufh)q( lrbl9yw 0b1ut 52n oxec*x8e 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 24txy2s +7fq c3e,000 watts (about 32 horsepower) of power tc27 + xsf3qtyeo a car's driving wheels. If 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 the right, a box moves witlp0t-,n za8ye h 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 pusl8zp-at0ye, n hed 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-rxgg:3b4n)ws8 scx e 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 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.ecx srw :g gs8-n)3b4x
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, eachrr8/pbn )eq5 uql5:,y-hyyr q 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 )plnrhry yy,/uer -55:8q bqq. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the obje2:lvalma v+6q sx1dm8ct during the time interval of thx l162: a8dv mlv+qsmae acceleration?

  12.08: Through what distance does the object move during the time interv xws58yj 7p9mmzhp7) lal of the ac577jxl)mys8wh9z pmp celeration

  12.19: The magnitude of the linear momentum gnuye5 bzxs9:s ,2 .ejof 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 in tb5z.j e9ngse,:s 2uxy he kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energyd)pu84y z6dnu while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of thnu64dd yup8z)e crate

  94.38: A force F at an angle θ above the horizontal is usco+tr1y1a*8n bkxkp rh6rj ,- ed to pull a heavy suitcase of weight mga distance d along a level floor at constant velocjr*pr,rkk 8 y hct b-ax6n1o1+ity. 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 nm d4;j.7za brpower output of 0.10 w to raise a block verticallyd7.4zrjn;m a b 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 from rest near the surface odmbx p.r9ro1 xwo++ ggh3 8.vof 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 wo.3w o dghob xpmgx.91r+r8+ ovrk 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 motionles3h3kh -c6l2/ajdd3vldn 5 hggs a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one2/nchvldd3 g6j53 -lgahk 3hd 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 7xe uszmhnmxy i7dn0z (8.0x. ;cie(sat 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, whuc0xxi en mn07yzxzs7mei(8s ..(;h dat 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 itk7th o,zp 4 osq78nrl- stops. If the ball travels 15 meters, wha87l ,qh pr-k4o zs7ontt was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identica;k0z .n zog2cwl kinetic energies and the three following statements. Which of the ac.owk0zn; gz2bove 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 isviwt j0 -cq6ek3oy3u 1 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 reaches its highe1c tyq-w v0ok6ie3u3jst point?

  06.20: A boy jumps fot8 / guezvau6i 17wlz: mo2p8h.wo* nrom rest straight upward 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 contanlhmwvw:.*6gu oi u81 e2zt/ 87pz aooct (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from k4(6b fir .ucv.az,njf s4 exyu2,5xraheightH 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 confr.( v4xzr nfsx eyac5, k .2,ub4iu6jstant 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. Ti9s xs1o2y* gche object bounces off of a horizontal surface in a collision lasting time T. The obje192iygos* c sxct 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 length L is pulled sideways eeg 8+obn: a1juntil the cord makes an ange:1j+bn8g ae ole
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 upjq-j:b nc (q5vq aa31e 5m;p0)pjba bz 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 pos3 -;jqebcpajqp5n(z0b1va mj )5aq:b ition 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 s/cwk;z7z gqxj h*z:1ms7y 0 daidewalk, along a 10-meter ramp to a loading dock, which is 17c701/h xs mq*zk a:zwgdz;jy .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=f9hpph ev-:d 950N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=9ph9pvd -:e fh15 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 eachy1 3 iduk.mr,5de4igq e2iyr 6 iy8il) 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 balls changing?.kree8m 32i,)dg1yi 6iqrdyi5ly ui 4

  11.28: A person throws an object of mass M straight upwaro1g i :p6 1;p4i9ezxcx1f/f1iacwcd t)n1yapd 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 sp1fcc6i4:x x 1poidfygp/ 1icnwt1)9e1 p a;zaeed 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 hase rep*)j+r (joe/fu n) a spring constant of 20 N/m. The potential energy stored in tej re/pn)u)+oe(j *f rhe spring is:

  97.10: A compressed spring has 16 J of potenta s;d62y7gwz2y)jjqnn /v5 nb ial energy. What is the maximum speed it can impart to a 2.0-kg 5w;2/ db j7nngnaysq2j )z6 vyobject ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclgf3co 8at0tw( l1x lb,ine of height H. A person decides to push the object up the incline in one of two ways with an applied forl1l0tot x(,cb8 f3gaw ce 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.