97.01: A force F directed at an angle of θ above the hor.ozm +.7.veukxuarjh/3y x8 g izontal is used to pull a crate a distance D across a level floor. The work done by the / xu mj..k+. rhauo37vxg8yze force F is

  97.33: A softball player catches a u/176 gcmm4kkgw 9nif8p )kbh6+vg d dball 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 upm k9 6 7w+/gfiv8 d6gdghbmc)kn14 kforce exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram shee k 4wqzrz-r87:tkq:1c k8uitft of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow mu17ttk c8 :-fqwkr qkru4zz :8ich power was expended on the wallboard?

  17.11: A 5.00 kg block sn 5xm;y-e9)ec8mtiu8xik( m alides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly xk a-n5uie xm8 8;tem9)(i ymcdecreases 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 on a h+ia2yh 7p -yodorizontal surface for 5.00 s. The block’s kinetic energy strictlypiaoy+7-h y 2d 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 force directed to the right is exerted on anh ell1p s)xea( hz0+2 3.0 kg block for 5.0 s. The block was initie pszl( 2)a10e+ln hxhally at 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 exerted on a 3.0 k+xr)v;cmbgpz0rm b4 ysg5( e)g block for 5.0 s. The block was initially at rest and)r4gv);gr0 +zxmbm(b sp y ce5 slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially z *+ hip z(7;m pbpr6o69xarneat reston a frictionless 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 direction. Which of the followin6;pi(9h pmnp+r* 6e 7zz oaxrbg correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hourez63b 4 xndic n-0kc 38v0rdutst;m;ywrck1; after the fan has bvyzmer8 0i6tnkscwr 1 b 03n;;-xu3cc 4kd;tdeen turned 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 sjhtmz) eul9fw;0r :9.0 m, a speed of 4.0 m/0j9t;w zmu9hr)l:e fs 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 textbooksemd2d;9 e;ow2/sp c hi is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box 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 ;d;/e2o9 eswp2 dhcimkg.

  02.32: An automobile engine delid sw/zpzy j06v.a 9dw8vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant vz6s j9/ 80zdwdp.yawspeed 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 rjwvqzy87 3 od7ight, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides wdyo7jvw 78z q3ith 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 at the b m x*cc:t66oylottom 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 t ccm6*to l6x:yop of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, eachaa;y w vz *g(jkatq./n;(z;mr starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a d y (ja;z; ;rag/*zn.vt(amw kqistance F, Car A has speed B. 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 object rrg(l9svdj1ommp 6cc pf+10 *during the time interval of the acceleration f(6po rmcsdg+cjvlm 10*p19r ?

  12.08: Through what distance does2kcfb-hr1qz; g p8i( n the object move during the time interval of the acceleratio( -h kq;gpcz12b rfn8in

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass7x*yg: y4mlg p1zbj 4g 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 kinetic energy of the mas*jy4mg17p:gy 4l b xzgs during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speu 03s4iyp pn3oed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cupp3y3oi 4n0 srate

  94.38: A force F at an angle θ above the horizontal is ur.2i k;cg,v2p r/x sdmx:5folsed 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. The work dons,g klod.2 ;ir2f5m r xpx:cv/e by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ofr +ep;as ,p e27yf3egg:h)zas 0.10 w to raise a block vertically at a consta gg p3,)7;:2pesr fsze+aahyent speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasf3 ahlf e zrbz83fa-; )25ie1itg;szled from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Efz-;tfl35a3hia gs); rf lbez2i z8 1earth 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 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 motiouxlx mo-( ,y8-vsd v0unless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best sh d m(xl-uo8ux-0sy,vv ows 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 zb d5 b(.emr)+mckm4hfgm;k0 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what+k.mmf z c0; b rm45ek(bd)mgh is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving atz/fcz2.l cr) e 15 m/s slows down uniformly until it stops. If the ball travels 15 mef /c)z 2z.rcleters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massb16ed2 dq6bhraknolc0 s9 8g 4es but identical kinetic energies and the three following st62n8bkrh4 csdaoqg9b1 l d6e0atements. 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 an9pb(cm. h+ xuupv+jkn + h5nq5 initial speed of 4pn5jb+h uk. mvc+x u5qn(+9p h.60 m/s. Ignoring 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, saz9+:o 7v5i qk18me. pfbqgwwtationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass ri.owbkpe i 9q18ga mfzq w+:v57ses 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 drqzm8*- thy,1eb nljr+opped from aheightH above the ground. The object cra 8m,btrqh z+*1jy- elnshes 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 coming to rest?

  12.48: An object of mass M is dropped from acoyoioes 6or:s i ze w5:57.)rheight 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 average net force acting on the mass during the collision with the 7e5oi6so)y.sw eor5: o : rzcisurface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until t.xbqw x+y*.r(5j (yj xfqu uz.he cord makes ay5qfq*b+xyz j..rjx (uu(wx. n 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 angle. The sled,ojdhgsb2).)k 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 sp)s)dg b2hjk o.eed 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 ram7v hb e,5zc*ecp4w5 blp to a loading 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 d4vbezp,c*7 h5 ebl5wc ock?

  12.16: A constant force F=50N (as sho,ugkl7 aj+e .+y7, vsp i*yurnwn 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=15 kg. Which one of the following choices beus,gk, e.y jura+pylivn7 +*7st represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are q0in8jjh5 ww: 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, how are the mechanical energies of the two balls j q0 :5jniw8hwchanging?

  11.28: A person throws an object of mass M straight upward with an /gjyojk.a/u ,9e-lwe 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 initkg .eju/y/,lae w9 oj-ial 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 constg 7dnk :-rrb 4eawhfjc//cm/e s6sa/ /ant of 20 N/m. The potentiasmn cka 6e-7sfbr/rw:/d/hg4a/ / ecj l energy stored in the spring is:

  97.10: A compressed spring haywtyb2,u*y:ty xegs977i l4d s 16 J of potential energy. What is the maximum speed ie4iwt7g yy: u,9ldbyyx2 s7*tt can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts f (q(mecglq 1d;apmk43(ltgk +xr6 2cyrom 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 speed4e +cg6 qg(rlx m k2;cpt(dqly1a m(k3 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.