97.01: A force F directed at an angle of θ above a2ygpe645kfk the horizontal is used to pull a crate a distancf26ke a45y gpke D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball ne5 p9r0vipe *of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exertr9e0 vpp en5*ied on the ball by her hand is

  99.14: A construction laborer holds a 20 kiloyc*5f,wd;hu e gram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secon defyu;,5*ch wdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with untpg un p2:zs;*iform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fnz psg*u2pt:; rom 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 acceleration on a horizontal su9(;fs0d /:a kcq)um9b. sqyj lah k+uhrface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.kuu yl9haf;hk. ) 9qdaqs +:0bmsj(/c
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 directedqe 36 ud45-ocpbgg ,to to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially a6b5d,u3 gpqc o 4to-egt 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 madhtftx ft.- 5:d94w exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfd5t9fwa- f t.tm:d4 xhace.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond throws a 1 kgempis9l h) c75 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 following correctly describes the above sitcm sp )9lh75ieuation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after ((1hs6pciesb v oiliu(..b:xthe fan has been tur(.ihousv:sc(.lx 1bii(bpe6 ned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50fgo)9hw6 2utqak +shhv7c,y1 kg has a position of 3.0 m, a speed of 4.c9 vaqh 6gts2uh+ )kh1y7,ofw 0 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 the middle shelf in the bookroom 1.3 m( ep4b*jqf8/7jjq xsq );ht nq from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how muqejqj( j/q xqf; n)4s bh8t7*pch work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engint 2-7beo /mivce delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 ic t7vm-o 2be/m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to77g h il27z,kapg,bw s the 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 tlakg, bh72s 77pgiz,w he 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 m5ey9jjbcdug5 w 2;o4 w/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 pusheu2c wjy59og dbjwe5 4;d 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 starte,p0 uy+ yrla9ing 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 terms ofyuep+ 0a 9ylr, B?

  12.07: What is the net fojhdu2 ,vnj *d-rce acting on the object during the time interval of the accelerdd* -h,njjuv2 ation?

  12.08: Through what distance does the object move during the time in47e :-rinacnxterval of the acce :4xrani 7nce-leration

  12.19: The magnitude of the linear momentum 5o7wp(jd3ux v 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 p5wux(j7ovd3change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of knhcnatc8wt0ab42b m,li /h1xf 544h ginetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices bcahh4wfh t18x la/btc5nm4i b4,n0 2 gest represents the mass of the crate

  94.38: A force F at an angle θ above :gn i +f wtkwx8:5lhm:the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. i:w:tl+:kg wnf8mhx5The work done by the frictional force is:

  14.31: A toy crane exerts an upward forcrk6 2a axy49xav:t et(e and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what ctkyrv24 (e: aa 6xa9txonstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Ear7uf u.4t29yohb :dc ulth, 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 tho.49udl7 bytfc uhu2 :e 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 height ho above a hard ov/wk8 )9kaue*n k/dyh liw67floor and released. Assuming that the collio/k ywkl i*k6dun)wh87 ae9v/ sion 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 moving at 28 m/s. The driver sees a barrier ahead. Ibr/ mc k,i l4k1dei/3mullj6 )f the car takes 95 meters to come to rest, w /kdu,j m6 blr1c3ie k)im4ll/hat 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 it yeeg 4ohb8 hxh+ q2ds;cwi9,9stops. If the ball travels 15 meterbc d92ey4 q e;hogs +9h8xi,hws, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mass4uvywmr ,7r/j es but identical kinetic energies and the three following statements. r jrwy4u7/mv, 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 ie5qhwu3-c x 4ns 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 highest point? -uw4 ecn3qxh5

  06.20: A boy jumps from re hhd :n:h ;/t.+0*1h:znwtxw decoyx xst 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 the1dxown d :.t0wnxxy +:h;:ethhhzc/* 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 droz(wyc,l(p f 1 0snt:15stlhu gpped 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 the object while comittup:f,(1chl( yzw s5sgl1 0 nng to rest?

  12.48: An object of mass M is dropped from aheight H above thu;o2 v hty1j w1g 4j(ltmv/sr9e ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises ;l1r 4uh/ 1yttm2 9(w sjgvvojupward 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 mqixj;(jdy06a+c8 oqqd ,,zofon a cord length L is pulled sideways until the cord makes an 8(j;o cx 0qqz, yid+jodq,a f6angle
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 angle. The sled, which .fr 6f.y, .iqac 7pn/fw zqo dv5.gmq4started at the bottom of the incline movin.4io cv6,rq.ny d 5qa.mfp.gf7w/q fz g 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 hill?

  06.09: A deliveryman movenp5d )xdh-v p5s 10 cartons from the sidewalk, along a 10-meter ramp to a loadidv5pd)px-h n5 ng 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 apuusn1k,95cn n2n7m axw,vyb 2plied 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 cuyv s kw12n,a9u57b2mn n,xn box for the motion?

  04.48: Two identical bowling bal yiiena:6fxf+z/ 29zz ls 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 bu6z:ai/ yf zze92+n ixft before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wz (6g bamxcn1c)ttt 42n;tyt3ith 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,t31ag ;ycx tnbmtc2z 6 4(tt)n 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-mr isw-9nb3pfff * 1k has a spring constant of 20 N/m. The potential energy stored in thef*rf1 nw-3fpmk i-s9b spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the z;xawf.v ,d ujc a.45hmaximum speed it can impart to a 2.0-kg object v,z5a .wch.dfx4ua;j ?

  

  10.31: An object of mass M starts from rest at d/+ m :0j6t1fiihe;y ucu;kqmthe 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 inc6uctium m+ e0ki;;jy/dh1fq :line and the object for both trials.