97.01: A force F directed at an angle of θ above the horizonta a )f4h:lyjzi(l is used to pull a crate a distance D across a level floor. The work don4h(ya iljf: z)e by the force F is

  97.33: A softball player catches a ball of mass m, whichk3 puub0 :4qk2tt3aui*q:nt c is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the 3cbp:u0*tuun4k:k 23 tq iaqthorizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 me s8nj xawy)z /+q;4z)qcs h0mk+afqb-ter above the floor for 4 seconds. During these 4 secondshow much power was +s+xbqz y a)0ka-;qs 4h8jwcnz )qfm/expended on the wallboard?

  17.11: A 5.00 kg block slides w-x1- r;xc 4l6xnai ifwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.01a-x;x6x-iiwr4 nl fc 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 k)rofe7phgnoi3c(-dq42 a3 jgso9 ,4(uffcqorizontal surface for 5.00 s. The block’s)s4fgpj(r9hfo3kgd(q o c iou7f 3,cq2n a-e4 kinetic energy strictly 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 a 3:rde ik:b 6,1ub*9j f2jhjlp h.0 kg block for 5.0 s. Thehk*2 r : i,e9p1jbblh fjud:6j block was 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 a 3.0 qy j+s.z82lu skg block for 5.0 s. The block was initially at rest and slides on a horizontal surface..s2 +jlq8y zus
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless froze, t3/jm3fe,ji xw.l/ppp fm9;7cdhyta-d0h tn pond throws a 1 kg hammer in one direction. After the throw, the hammer moves ofcjh /-ixt m3j.9dt h 0f3tpyp,7e,la/f w pd;mf 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 energy..ofbuxm+-j 1z An hour after the fan has been tfo-xbu1 z+j .murned 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 positio6od. 92jee gp*/rpkovn of 3.0 m, a speed of 4.0 m/s, and ao .*e/rdepov9gp6 j2kn 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 middlekg -eyer 61gc mkqn)2k*4 xtu; 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 flotq ur1c)n-ke* ;y kg6mxgk4 2eor, 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 watts (abo* mbmhesux+(;ut 32 horsepower) of power to a car's driving wheels. If the car main xbm;uh m*+se(tains 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 rightoh nx9bw e7( v5y b2:lapy,ob4, 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 toeva hn o9pyb5x2 b(ow, y:b7l4 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 attxnt (w6 g234rgxa(s y the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as xgx6n(( 432tgwratys 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 right, each starting from rest6uvodofk ,0z+;yg(; ygp 7smk, 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, who z kgu6 y;0;m(f7odpg+vsk,yat is its speed in terms of B?

  12.07: What is the net force acting on the object du wg59oc.8b yie9qe6 dyring the time interval of the acceleration?bwd9q6.9cygo5e8 y i e

  12.08: Through what distance does the object n qcbg0nf+1.emove during the time interval of the acce1+n beg qc0f.nleration

  12.19: The magnitude of the linearlg q )wqw ,0z7qum)m8i momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a0 iq)w7mqugm,) qlz8w time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whida o9sjvtg6;i;( 1jk rle its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices b ;rjjtod(vk aig96s; 1est represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal inx;o-)d 84;-wi*iupi mm* + afxh-blmsdc p )is used to pull a heavy suitcase of weight mga distance d along a le i fwxp8)m;md*+db4ip ih- s cm*ni)-;aou-xlvel 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 force and delivers a useful powbd.yvs*y y40der output ofyvyb.dd*s0 y4 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object ishdfl;l9f d* 4n 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 donef 4d*dn;hll9f by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held mfafp psh9 +6tiq8*p (hotionless 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 shows the relationship between the total energy E of the ball and its height h above the h9psi6q f*a(ptfh 8+p surface?

  07.06: A 500-kg car is moving an 2.t+(:ynxy8g a hu/ye ybnj9t 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what : xt 2y ny8nyj.+nubge9(/hyais the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movekmcl(. );ysz ing at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force .kz cm)(lyse;applied while it was coming to a stop?

  02.26: Consider two laborator9lhvbh:7l7cm m cr:)o y carts of different masses but identical kinetic energies and the three v:7:bolc7c9) rmmhhlfollowing 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 icm*w+k +b s1.fz 1wjwjsen6 *hs 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 reachess *wm k+sje+wz fwj6c.h1n*1b its highest point?

  06.20: A boy jumps from rest stra 0da,x)z ; a/u ubtjdu1lbpqr1*o*wr9w / toy;ight 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 )01x9dzquoay; a,lwbju w/r *o/rbp* ud;t1tpoint 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 ns 34ndaqi. 8yd -vz/bmass M is dropped 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/b8adzyn4v s.id q n-3 object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The oblszi008d pohenbr- /5nc .q*aject bounces off of a horizontalnd*ol h 0rz.e0n-p5qa8sic b / 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 surface?

  96.38: A pendulum bob mass mon a cord length L is pulled s9+ j-/w8a/ozj xj 5uxd2vkmbxideways until the cord makes an angle dx x/j9vmzjjku8bx+ 2/ ao5w-
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 +hc( xlcsv8 sv/-twooa:+kk. 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 c+sk/s ht w.:o8xokl-vc( +cav omes 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 sidewalk, along a 10jz-k;5m 8f5 tf3e+namryw fnm y-9c 7a-meter ramp to a loading dock, which is 1m 73f +8fckazej ar-y;9mf55nwynt -m.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 inb rju8rwa.u4 7w/7i(ww.x l wm 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 best represents the work done by the forca/w78.j (xw.lwrub wir wu47 me F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppefmpqi .becng5 t3 6-paon71;kd 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 str gce5 -op7n .ntkqbam6f3;p 1iikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an objec up, d; kptv9m*fee4re;n(ad; t of mass M straight upward with an initial non-ze p,a*k(n4e;dm;t; dvrpf9euero 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? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring c v(/9nw9utghp onstant of 20 N/m. The potential energy stored in the spring is:u(9pv/ 9tgnhw

  97.10: A compressed spring has 16 J of potek.ob0i9u c*u/ojp2i(d/ksw3bgy i9 bntial energy. What is the maximum speedku /k9ui9bb*(ii g3d2osjy .bwo/cp0 it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixeaz wl+ 8u 2 hc3z+vud 0gl5q;sml:;rwnd 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 wz+v: 3 auwhd0c8nmz+ l q r;5sul2;lgincline and the object for both trials.