97.01: A force F directed at an angle of θ abxsqh;ohg1 q,6 y zs5;iove the horizontal is used to pull a crate a distance D across sx ,6ghizo s1qy;h5q;a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movinidtc(,8wc x5sx vhd .0g toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exe8t(hd v.idxswxcc,05 rted on the ball by her hand is

  99.14: A construction laborer holds a 20 kil- w2m3g7ku-vza*e qoa, *d jkcogram sheet of wallboard 3 meter above the floor for 4 secj m*o 7ac-qzae3,ud*kwv gk- 2onds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniforo6rlhq fi/v d3yys .xxw*)8mt(aa 5 h3m acceleration on a horizontal surface for 5.00 s. The block’s kinetim5 x a(3 fvyoqh)wrt8yil3axd*.s/6 h c 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 wimgg1ey * s(5eith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinegie y(g1s me*5tic 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 direct0l 3ga8gy:4s zqzwr9ued to the right is exerted on a 3.0 kg block for 5.0 s. Trlqugy a98: zsgzw403he 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 exer)/6sa*rwbmve;n +xf vted on a 3.0 kg block for 5.0 s. The block was initially at rest and slide+;xarb*vm nsev)/6wf s on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initwogs3qn)) vrz ddw-*/ ially at 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 th3zgn-q rw dv*d)o/sw )e other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kineticq xu)c6)2nhmx energy. An hour after the fan n 2qxx6humc))has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 f f *o4 )-ah2kyz5yixnkg has a position of 3.0 m, a speed of 4.0 m/s, and an a)42afh fyyo5x izkn -*cceleration 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 midd7kr n33-l; 3i0tkesri rapt +ule shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shel-3tsu lk3+r3 r ri0 npaekt7;if 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 watts (about 37i pli1v*tcj9wiood 4(6 7kti 2 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magn*dij4tow(i9i1klo 6vp7 7 ticitude of the retarding force acting on the car?

  09.13: In the figure to the right, a bon+ be)k 8vc:c )vsla5wx moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to vcl):we 5bka )+vsc8nthe 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 thwgmjc-h 7ww -( vsv;m/e bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is b gjm(mw7 c-v/s-w;wv heing 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 startingrmvss. 9g o*r2 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 *g2. mos9 vsrrtraveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during th*div; ,g63woafptus 4xgq 41hr/iaw5e time interval of thdqgt1w3aauix;p/4 wovish564,* g r fe acceleration?

  12.08: Through what distance does the object move during the tim5gjx14dfi,mcn t 63b te interval of the acceleratinmx4f,1cd5 igt bjt36on

  12.19: The magnitude of the linear momentru/3 g7w3onjc um 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 change in the kinetic energy of the massc nu/337jgwo r during this time interval?

  14.11: A crate gains 36.0 J of kine /y8/h*q ab/flal:*u- v6dxy3cjkedwtic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents thy/8x byeq:wdc/ka3 ul* d6haj/ vl *-fe mass of the crate

  94.38: A force F at an angle θ above the horizontal is used wx7 6 am2b1-eyz7mtgkna +m7tto 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.kgy xt7 en2m at7zb7m1a-6+mw The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful pgl o;r vwes-f.*fw-sbm 4f7 *dr5 uk;oower output of 0.10 w to raise a block vertically atew*;o7mf4ogrff wl.u - s5r*b;s vdk- a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released f bfutq/3 /fvoq75oe k;qv 17dirom rest near the surface of the Earth, the gravitational force acting on the eot7 v7f i1d/qbq;vufk5o /q31.00 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 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 floor andiac mk,f(d1f4k, xr8d83 e fts 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 heigh k 8fmaed,rdti kf4 3f1xc(s,8t h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If5+hc c5i:sbs f the car takes 95 meters to come to rest, what is the magnitude of the minimum average +5:b h5sccsifnet force necessary to stop?

  00.26: A 500-gram ball moving at 15 mw- ia: 2ormnx6/s slows down uniformly until it stops. If the ball travels 15 62i rwxa: -nommeters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts3rst g(le85p fgqy(ve*vy3*x of different masses but identical kinetic energies and the three following statements. Whis5 v33yfv(lr(*e etp*gxy qg 8ch 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 rayj 3+pjvrxya)( t,* with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches itv,r)r*( 3yjypjat ax+s highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sk0nb4 5w o ejq;x649qytgz9 onurfacexq4ynzwnq j g9oe5o4 tk ;09b6. 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 drof(ipr ee( t3/n*s:l 2d+cew kapped 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 magni:ilsc2k+e(* ew( d/ept 3ar nftude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is droppetweg*dtyqijwk 85 8j m27mmml7 :9zn+d from aheight 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 forci8t *q5yjmk jw 9 gmd2wem8:l 7zn7mt+e acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lengtxcy;q 205qnrn40i i 8b fdkku6h L is pulled sideways until the cord makes an 2iubn0kq08 cyikfn x 4dq5 6;rangle
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 qvtvgdf-27 u +sa0 cpp0pn5-uunknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height out+qa 7p5f0v u0-npcpvds-g2 f 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 moves 10 ic- 2kbomy4vlh o;aha/ zw3- 7cartons from the sidewalk, along a 10-meter ramp to a loading dock, wh/w3l y-hv cak4oi2;b z ma-h7oich 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 inj y,fso-mh o v l*ezw3)mkb/ +7va:(xu 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.hm zyv(/ vw)+7- ,3 mlksfjoox*au:be 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/-nkbtioet0rs2uew6 - umr8/ 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 eneimte/6k otbe-n sru 08rw/ -2urgies of the two balls changing?

  11.28: A person throws an object of mass M straighy eq/ig)wv5 1ft 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? I 1v/fwgiey5q)gnore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 2 (qghhy4:sy;m) dbbkhxk -;m6 0 N/m. The potential energy stored in the sprihsyxh bkh4;mgy;km:bd -6q )(ng is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum 3 byk0h:/dq lonwugy+ j h76u+speed it can impart to a 2.0l/uy o:y3h+60d gwq+bnuj7kh-kg object ?

  

  10.31: An object of mass M q n2rs7c4)ry estarts 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 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 t)7enry qrc42 she incline and the object for both trials.