97.01: A force F directed at an angle of θ above the horizontal is used zprjb ,w)(r:s+j-wz6q-vj y lto pull a crate a distance D across a level floor. The work done by the forcbjrjjvz(p- - :+ywq)6w zls ,re F is

  97.33: A softball player catches a ball of mass m, whiluve/ pc+oqwnxzus.1 -o3 / 9j-dkrn 0ch is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. u rcdxvj wp-en/ u+3-k.o o 0s91nlqz/Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdkbgi xt,a w(hd-rb2-5s a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbo i -h,w(bx2rbk5 tda-gard?

  17.11: A 5.00 kg block slides wit4h5 - c -(nmylku)eyenh uniform acceleration on a horizontal surface for 5 yn(ykmnul ch e-)5-e4.00 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 block slides with uniform acceleration o vwi3 (2ro3c3qu(jh xvn a horizontal surface for 5.00 s. The block’s kinetic energy strictly dec h2(wvr cjqo3v3uxi (3reases 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 block fori u;c:u.sl*m y 5.0 s. The block was initially at rest and slides ol;u :uiycm. s*n 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 av2tqaes6y b21; tbnxf;u,jc 3 3.0 kg block for 5.0 s. The block was initial6cunxb vs;2eb;at tf 3qj21 ,yly at rest and slides on 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 fric e3cm lg2/zu5ktionless 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 dc 352leg m/kzuirection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic/uu.f :c1sl6+ 2gj3txpva rvwrh vr68 energy. An hour after the fan has been turned offs p1w:j6/.28r v+xc vu tfruha3g 6vlr,
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 n49/s3znkh sf m, a speed of 4.0 m/s, and an acceleration o n9sz3fns/ hk4f $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in t02kj mnbjqm06pj+)d; i,joaiss ;4 hbhe bookroom 1.3 m from the floor. If the janitor relocates the b 0;)jm46a+j2s ;o0di,mq ibn jksb pjhox to the 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 watsd,+pcnk h4 (xts (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), whasx +h4kdn pc,(t is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5qme6 s f:k4y5a.00 m/s at the bottom of a rough, fixed ieaq46y5: fskmnclined 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 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 atkvgxfxv8 f:p2 5s(1la the bottom of a rough, fixed inclined plane. Th1(8x k vp2xf:5vfl sgae 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 4/e rok: 3fmi njk/vc0n::zbdright, 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 : ck3vie0/nf:zjr :4/d b konmis its speed in terms of B?

  12.07: What is the net force acting on the object during the time interval of tww9(3*q( qzv6w ni)libu hxgsd u vm5:1-rno9he acl*nq ub6umsdg) 9vn :v5 (1wiior(wqw3h-xz9 celeration?

  12.08: Through what distance does the object move during the time inte1)izf u3fuu9ruthkqx d -n 7/6rval of the accelerau93udrix7-zff / 1hkqu)nt6u tion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang)zbyb j q/4shm- mn:bd ,o2l/ j9b8tmxed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during thi l)bb2b/,49j:mnbyxj mdst m-/8o hqz s time interval?

  14.11: A crate gains 36.0 J of kinetic energy while v1a )yaw4xt;4 nba7fwits speed is increased from 2.00m/s to 4.00m/ww7 4;tfya4x) avbna1s. 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 i ogdkn)ez9*fg,e: yh 0s used to pull a heavy suitcase of weight mga distance d along a level f,go g*k0:ny ee hzf)d9loor at constant velocity. 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 exer;pm)eg 0k ozq9ts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what const;mg0k9z )epqoant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasrx oh61mqgyj*1geas34 f/ xqumq+-h6 ed 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 oy4gm xf-6r+qa 3m6h1 xqje1 s*huq/gfalls 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 a heightl tlk4+p usc5fb9e4,-s9ohoc 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 E of the ball and its heies tcb4 c o 94lfo5h9k-pls+u,ght h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. Ifjvycuh arh c9(h*55r58b0f ig the ca r5cr8 5agvifh5h0 h9yju*( cbr 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 u4rro 7griaiw)tdu ).- niformly until it stops. If thrd)ar-7 ur itog i)4.we ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differentvon/s4 t6rl i4tr r72ti1i ;omhen/c. masses but identical kinetic energies and the three fl it ;rr/ti/nmcr62hn . i4tes17ovo4ollowing 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 tx9; :ykg uv/4lm o40lhej96/czqneehossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is zle49h/0: l / heokqmuc;jxn g9 6yve4the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest sttx g;vy0i 9j)w 7(cqkrraight upward from a flat, stationary concrete surrgcqy07x9t ;j)i( vwkface. 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 and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obj7z*hh)f:tf 61rxkkt19dy-zp dgm+ q g)-jfpn ect crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. As :)71pdy tp*h)+1g f g tmq-kfd9krfxnzhz-6j suming 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 mass M is dropped fro(v*7a qfrcbyec-g1w;nx q6h.m aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then erfy.vg6a7wnb (1-; hqcc*xq 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 nnc2ve6so 0+kv6 oq yf.ama37pulled sideways until the cord makes an angle aov.7o3qnks y62ac f0m v+e 6n
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 u7a1va )33ms mk8 hggxuniform 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 gm8mxg3k)3vsh u1a7 adown 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 li(iy1k ,rl cvwxdwu0kq +9*8 a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a lui rdl 0wv*(ikx +8q1w9,ykc 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 .x7 7vfq una;0c8ysk)ovd- ibfor the 6.0 meteruqbc0k.77ai) xofn ;-ds v v8y 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 motion?

  04.48: Two identical bowling ba/st(4niue7mgmcj vsw5i*a2 e7p u04 jlls 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 but before ball A strikes the ground,ti4*(5ncm 4 wju s 70g2s7pv meeuj/ia how are the mechanical energies of the two balls changing?

  11.28: A person throws 8.jb tqd::ymrp(ycn42 tv(tkyj6o b4 n0 q0dxan 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 of mass 0.5M straight upwarjqkpy4t4 8djdcn 0nmxy6v:(bo0 t tb. :(q2yrd 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 spring that has a spring constant of 20*fvwm85 ckp0g3/2c s0.:so rkjeuy cc N/m. The potential energ cu 035: vmf gcke s/.jpykwrc0cos2*8y stored in the spring is:

  97.10: A compressed spring has 16 J of-08z,z olicjm oc/7lq 3bnm0 j l)voo3 potential energy. What is the maximum speed it can impart to a 2.0-kg object ?bm3c0llv)-i ljo n8j3m0zooco,z q 7 /

  

  10.31: An object of mass M stto-e,p tw8yimr j637q arts 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 spee3 8r 6ejwmpq-yoi7t ,td 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.