97.01: A force F directed at an f d 2vhk:.w:ylangle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work do:vf: wdkhl2y.ne by the force F is

  97.33: A softball player catches a ball9k/,wlf dj )vd of mass m, which is moving toward her with horizwfk) vd /d9j,lontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction labore ,1w3p7 :xk ncdj4gknxr holds a 20 kilogram sheet of wallboard 3 meter above the floor kkgxdx p31,j w7n:n4c for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration o06wrl 5d+k/qxy il;sb6+tyeh n a horizontal surface for 5.00 s. e+qr ih+xw6/ kstdybl5yl06;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 accelerkvalm**gob2l ao 7*ys)t )j2dation on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decmb jyv ta*ook a*7 2ldl*sg2))reases 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 forck 6 rrrfy gu/*utf4e86v, oqm2e directed to the right is exerted on a 3.0 kg block for 5.0 s.6vum,/4r*f rr f o8u6qet2ykg The 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 tp*0,nn 7pir(z9usm ow-9fobohe right is exerted on a 3.0 kg block for 5.0 s. The block was initia o9bfpws n,7ni-(0upm*o rzo9lly 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 fr cb*h0k)dlia/ z:o2bbk:ua+oictionless 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 diuobk:0/bal k* hd2+ bca):zoirection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinevy p2 xb 6.dnc,; g7sjuf3*quutic energy. An hour after the fanj,26. qy f;cdpxubn 3vus*7gu has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a be ibi-8 +mm-mavtoj-izo*7 v2lock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an avbzo7io-e2tm a8-m-v+j m*iicceleration 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 middle shelf in the bookroom 1ri5ldb985b,to6i0 tdfd 2z yt.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 doe0bo85 29ddl tt zbi, f6id5ytrs he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine deliversvjgp:f7q6 -zx 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the ca 67:gzpvfxj -qr 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 spev yw6jrbzriqi, 7 jvh,33y; ;s9t cca 9p3co/ned 5.00 m/s at the bottom of a rough, fixedhy/;rsqvc9 coipb 3a6n,3w3jy rvi9,;cjz 7t 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 = 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 ip 0,bivl u .3w(utd.jkkm jd:+-xu*c 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 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 touu-cdlk. x3dvij:tk *mwu0(+b.i, pjp 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 fro;0b 1pciwta7um rest, along a straight roadauw 1it ;7cp0b. 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 is its speed in terms of B?

  12.07: What is the net forcek4kvq+zj;o -o acting on the object during the time interval of the accelero-k q+o4k ;jzvation?

  12.08: Through what distance does the object move during the(ebs-i*tr7stnnx e5dc 5 : p(u time interval of the a(:(rbtite5 d spne *s75-c nxucceleration

  12.19: The magnitude of the linear mofvxasf4 8d-) znpd-4tpy zobja-t+6(/0his imentum 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 mass during tj 4-f sp)onh8-tvy dpaib/-ai 4dt zzfs(0x6+his time interval?

  14.11: A crate gains 36.0 J of kqv4zm-o k;v-q)fy, 6 undbxrl +uq y0-(m/sgoinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best k,fvx/ ;6b unmqsod( vgl--ryq)u+-0o 4mqyz represents the mass of the crate

  94.38: A force F at an angle θ abob oq)ka:5 tq,yve the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction b )kq:b5q, otyaetween 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 usefoo1 gb+zznr9;ul power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thiszbo;z o1g9r+n crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of+riild 03r(93vj purw 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 gravitationivdu9w rrr03ilpj3 ( +al 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 1 j7+jvcij- wt tn,givy5-gn y;9uap7above a hard floor and released. Assuming thaw ng,g;v i +5c-7ajnpt9- ut1vj7y jyit 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If tmiejm 1ee++j1he car takes 95 meters to come to rest, what is the magnitudei1m+em+1jj ee of the minimum average net force necessary to stop?

  00.26: A 500-gram ball /9q*hb)vl twgy g yx55d6;yleh wrj4 4moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comingbh t;5w5rvjy9 x g)yq4 ylgw4 *dlh6/e to a stop?

  02.26: Consider two laboratory carts of different masses but identxumpxhi zm 8)2 m; hfm32 u-a n(3b-xs0vaz(hzical kinetic enerzuuh0a vm(h;h(8n az3-2)xxsmp f m m bxzi3-2gies and the three following 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 tos9h x5qs. i;ieq09 kmjrsed vertically in the air with an initial speed of 4.9r9msq.0eh;ii jx 5kq 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 stra7i6g3,bpa khwc)f pwy ,iyd+e-a :9azx9buv3ight 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 point of the m6z,hx3d+i -bai av:pc9u7yy ga ,3ewfp9b )kwotion. 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 fr tznh,2k65 pmrom 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 on6,h 2trpn kmz5 the object while coming to rest?

  12.48: An object of mass M is droppedxf .sz0oe3v5 r from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises sxv53.fze0 orupward 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 Lsy 4vkmq)2;c i is pulled sideways until the cord make; 2kmvqi )cy4ss 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)d7v+xt g)wjs 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 7)tsjgw+dv ) xrest. 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 :9 j3u j *orh2ouvjui3cartons from the sidewalk, along a 10-meter ramp 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 onr9juh:*o2 u3jojv u3i the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6.0 m cxhe1hwg3r qs 9jfz 96kz;9.zeter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following ch1ze9r9.fjx63csqhkzhw; z 9g oices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are.v5 lr1;h whju 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 grounlwhr 51j.; vuhd, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M s2zi8 (igx0fwf (8e( hqr;tvoi arar,+traight upward with an initial non-zero speed v. The object rise,ai2 wvif 8egrh((i8txr +r ;qo(z 0afs 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 constant of 20y* )hjtpti ,yvp01vl3 N/m. The potential ephyvvy ,l) *tt3i p0j1nergy stored in the spring is:

  97.10: A compressed spring has c+jr/;fi;pb3duu:8 -eta* ;mmu ft wk16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg obj f c*t;uum+;b- fd ;jtkup3ai:w8rme /ect ?

  

  10.31: An object of mass M starts from rest at thg9l a73/a5c yrpz 3gnoe 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 ean37 9az/opalyg5 3rc gch 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 trials.