97.01: A force F directed at an angle of θ abgfex/v) c5l y y16w7byove the horizontal is used to pull a crate a distance D across a level floor. The work done by the forc67yfy /5velcyx)wg1b e F is

  97.33: A softball player catches a ball of mass m, which vjd f q 33ngy-2g2ccb0is moving toward her with horizontal speed v. While bringing the ball to rest, her qv yc3d02jgb- 2c3gfn hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer hol,he z5tbf yx73ds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 secon,fbzh357xty eds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slidesx* th.4ozrpn , with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly.,zo4npr*th x 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 b, rv-amnh34qelock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Jv3hre naq4,m - 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 directedutfzo 889 hir5y3fl-q to the right is exerted on a 3.0 kg block for 5.0 s. The block wltfqz8fu y-5 r3o hi98as initially 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 d gm/r.2*(d (qlweb2bkjmem e0yz;h, a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonta, / km*z.e(me eh; yd2wb2(grdqm j0lbl surface.
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 throwse+ nin/ .srdy; a 1 kg hammer in one directiesyn+/.i; rdn on. 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 situation?

  03.14: A fan blows the air and gives it pgv xhrafpvkk-9i5e)y ., : 0ckinetic energy. An hour after the fan has been tur,-v9crv :ek 5hfkppxg.ay)i0 ned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block o ,8amgzb+,pxm;gfn g 1f mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratxgm ;mfb18an,g,z +pgion 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 middjm-esvazg-s; 7lq5e 9le 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 10zm q e;gs-sev5lj7 -9a.0 kg.

  02.32: An automobile engine delivers 24,iowxw -by; tjm.g z78 -cap+;m000 watts (about 32 horsepower) of power to a car's mib ;+- c-m8gw;oypxzjwt 7a. 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 with speed 5*vhamhe*3q rl5b3m0u.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 r ha 0umq h*bl*ve335m= 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 ts; fn s-nrsx+1he 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-s ns fr1sn+x; 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, ea gv)hnjm ,0(/k7qnh mbrvc, d(ch 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 distanq hn7nm dvk(,bhrm)/0vgj(,c ce F, what is its speed in terms of B?

  12.07: What is the net for fn; cj1d6m0bcce acting on the object during the time interval of the acceleratio6c 1 jcmd;n0bfn?

  12.08: Through what distance does the objecj . synkma,rlbl)y8:3t move during the time interval of the accelela b).8j yrsy:k3mnl,ration

  12.19: The magnitude of the linear momentum of a 4.jmq.w z.hj6sj e6+1qy 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 the kinetic energy of jzye js. +w.m6q6h1qjthe mass during this time interval?

  14.11: A crate gains 36.0 J of kinic;k /,z*xrpgq 9r1 gsetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents theipksrgqz; g1/*c9x, r mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pcs7o zrj8nof 6plry ) 0zyn4v /n101bbull a heavy suitcase of weight mga distance d along a lcynrz1) sv7 nb 8j6y/f0zlr1bp0 oo 4nevel floor 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 exerts an upward f2yr9s9v: ybpk0xps)h1n fy-lorce and delivers 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 0fyph9s v19:rblsxk2y pn-y )kg block?

  12.18: A 1.00 kg obj3b.do *s h9iq t:qhw3aect is released 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 falls 1.00 mto the ground, which one of the following choices best represents the amount of work done by the gravitational w qqshot. :hai9d*3b 3force 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 floor andweb6sak9p:, 8zac f/v released. Assuming that the collision wi :a9wa c,z6fv/p8kesbth 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 9s,3-d-xfxg tvs3;q ty ;-gus8zqiwris moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitf3tyg r-xsz-8dsx qg iu,s;q;tv-3w 9 ude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movig) 8r2)ad))9 xwoy agxhoa c 1nt++gsgng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was ++gwyn82)a tr)xa )g)sxdogch og91athe average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of3vbyhgu+fwg r8 hm//3 different masses but identical kinetic energies and the three following state g +3r38fbhyg/h/muwv ments. 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 initial spe4iw2.w*:k h8sok4rf1imx2e n / uvhpj ed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its h8/hwp:skx1n 2oih2if4 ewrk *m.u 4vj ighest point?

  06.20: A boy jumps from rest straight upward from a flabkxpi; 3tn sq*pee* *,t, 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 contact (N) between the boy’ s feet and the concretnbqep*x*;et*i,p3 sk e do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The iyw4jegvc dnd i81yqvh,7+n8r )uk .:object crashes into some soft earth and47kciv8 gd1i.dw ryqy vh:8en )n+ ,uj 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 aheight H above the ground. The obvwo vas nx929jl1+z8 vk(t+hi ject bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height os +tj9x8+lvv91 nhk2wv(z iaH/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 u(dlt ;q 2kp vq5x)s jcs+n)l)nntil the cord l(2pktc qdv)j5nls;sn+) )xqmakes an 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 unkne 5alq g3;tk4sown 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 th4gel53a; tsqke 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, alongr0u fmptl(.p, s 57sfm a 10-meter ramp to a loading dock, l7,(0 mumf5s .t psfrpwhich 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 fig h593 :y)tpc1pagrzt uure) is applied for the 6.0 meter motion of the box upward along the incline. The 3c ytaupth1pr5zg: )9mass 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 balls A and B are each dropped fro3,m,byf s,gvem 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, ho,sy3gefb ,,v mw are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straighqx.ci( 15gkdvbnf:m 4t 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 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? dbk:cq x (451g.vnfimIgnore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring a5w g4qao6oxtow*vcaq8;++s constant of 20 N/m. The potential eneaaa +qo65o wvo g+q c8;t*s4wxrgy stored in the spring is:

  97.10: A compressed spring has 16 J of potfj4a jzgpx.xfh*3n(khx23 e*ential energy. What is the maximum speed it can. fkzpj 3(*aegx 3hx4*h2f jnx impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botvnp kl-d,mu +swn/3xu6 2mva1tom 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 incline and the object for both v2 3aun/pmvkd1 mnu wxl-,s+6trials.