97.01: A force F directed at an angle of θ abo6udm vhu-uadhor;g q,k/.:o /ve the horizontal is used to pull a crate a distance D across a level floor. The work g,do/d u.r;6mk:v q oh huua/-done by the force F is

  97.33: A softball player c.u5ikdi7gq fkw pye40lk 7q9 7atches a ball 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 deceleratioew.i5f4ki0pku l9y7qkg77 qd n, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 mez z v1:vug0gm6ter above the floor for 4 seconds. During these 4 secondshow much power wauvz06v1g z:g ms expended on the wallboard?

  17.11: A 5.00 kg block slide;i81y p+e fa/3;ctx9o etdpobt3 dg0 ds with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J p o /etf 3gi d0acxe;t91b3d;d8po+ty 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 blocl eg-zhh,y3)7mw* 8 hcilu;ogk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy egh8*7)ol3y; lm,h -hguczwistrictly 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 3.0 oronji* ;g9h/ kg block for 5.0 s. The bloc/9i ;hron*gjok 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 kg l-+v8s dk )xiyblock for 5.0 s. The bloci8-v)yxk + sdlk was initially 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 frictionlessy 8w5q9x8x-p -oe8vifi 9 fawy frozen pond throws a 1 kg hammer in one direction. After the throw, thee9oix8wy fa9 i8q-v- yxf5wp8 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 kine 5uq1uyh -xo)utic energy. An hour after the fan has been turneq 1uu5oyx- )hud off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 r-yjn26wiin 1 r) *vdgkg has a position of 3.0 m, a speed of 4.0 m/s, and an acce gr vd inri*6y)w21jn-leration 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 mi m4q4wbt s dcpflo5vk85(, 0rgddle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m d80m5 kf 5( 4gr4wv,otpcqs blfrom the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile so0oizblaq-t3 a/m * :engine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car mainl so-z: /ambiaq0o t3*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 ygsxvg7*du/ ) lex5y2right, 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 to the left with a constant 7uxy gl v)5g2e/*xsyd 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 w.4bo8)rselv3yo c2ytz/ wk9 3lct 5bv ith speed 5.00 m/s at the bottom of a rough, fixed inclined plbw) ce vo5bk.lyst 48tl9c23o yrv3/zane. 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 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 stak0odxvj:pyh+ p7w3 . arting 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 C pwdkp yoj0+h:.3xav7 ar B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force actilt0azb2s 2)u82g0 ome)b jugqng on the object during the time interval of the acceleration l28os0b2 )2 tau0u)zb gmgqje?

  12.08: Through what distance does the object move during the time interva9a.vnm4 9i/ytxvjj3-vmx m -u8j 7ojll of the accelen.- 974/8xmvxjjm iyo9jj -vtu3 mva lration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changd sw:qa3 cqnp p;xaw137o. dk5fxuf65ed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in thw3f oa w5x uqkc73d.sx1:;pd 5qnfpa6 e kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its s hee.j68er 1zjpeed is increased from 2.00m/s to 4.00m/s. Which one of the followee1jze.h j 68ring choices best represents the mass of the crate

  94.38: A force F at an angle θ above the;rlr7+;1yp.zp k u*rdk z.ndi horizontal is used to pull a heavy suitcase of weight mga distanpr1dl ;rukz.;+*id n.7zkyp rce d along a level 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 upn+sdsum 3;o q/ward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thi qm+s us3n/d;os crane raise a 0.20 kg block?

  12.18: A 1.00 kg object glm un6 o6z2ds,6h6qgis 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 gh6lsug d66o,q2nz6m 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 d1yk(t r byz/wg3h7+l and released. Assuming that the collision with the floor is elastic, which one of t1khg+ 3 db/ytzr wy7(lhe 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 8hb 8sjjxa 8*vm+dns tz2kkgv:k /):t 28 m/s. The driver sees a barrier ahead. If the car takes hs+ngkj*zdt ka) xbmjv8tv88/ks2: :95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down un+/t0f i jnc m7.ujj*yniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stopf.j i*mj0/nny+cuj7 t ?

  02.26: Consider two labwze z1.4hxfa/kor9z x /f ,i9soratory carts of different masses but identical kinetic energies and the three following statements. Whichfzswek.iz xr9f z4x9,o1/a/ h 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 initialzfmj l/x(yg ajx:-c8h3n*r0iz vti5+ speed of 4.60 m/s. Ignoring air resistance, what is the change z 5igrlc8 +z/3hx jmnv-:at0f iy(xj *in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from3a-e;e8 ffdp-voa73 uzvhb 5td:uv :n 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 motion. How much physical work did the average normal force of contact (N) between the boy’ s 78;euf3tozdh35vn: ua- -:vea vf dpbfeet and the concrete do on the boy?

  02.48: An object of mass M is dropped ibm x /q,zt eksjs7t xzn,,;4*from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a dist;4bsqz,xxkz i t n,m7es/,* jtance 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 drop 4m6cc8 pnaou +/v()ss -qwlnxped 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 heighc4v sw+m8)su/xql-p(o c6nant 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 len d+gk95(a /zx.2uw)jnur4.oirjqhk vgth L is pulled sideways until the cord make nk.9zhrj4dxi.2 qvj/wuk+roa gu5() s 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 w kb0j vb)2;wd/ st2ckincline 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 comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its original poktsb/22)0bck d jw ;wvsition at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from 2aa s7y-yxe kbz p( ec3 7ecd)kvi-34zthe 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 --c z)pazc(23 s 77ekb4xkv edyie3yathe deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50l y1i o1t0) e, nwv-n+aaboyt0N (as shown 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 best represents the work done by the force F onthe box for the my1 itoyeabv-o0nl+ 10 n,a)twotion?

  04.48: Two identical bowling balls A and B are each 0 gp0 grn 4hu4;tv/bydvwt i ewcb5/9)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 mevu0vyrc4deb 4hw gb/twipgn t ; 095/)chanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with u*1zlt+n i+9tknuyyx (2+ ck+2 z wzpkan initial non-zero speed v. + 2 1k(z+yuzzynl*kt9 i+2kw tuncx+pThe 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 scv7va5e2 mhj evn(wp i0a ,1:gpring constant of 20 N/m. The potentine(a hvg1v27ia ,cepjw 0:5vm al energy stored in the spring is:

  97.10: A compressed spring has 16 gk 5 kpqz..ab4/;eatxJ of potential energy. What is the maximum speedkkz 5gt.. /pea;4abxq it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starm +ky/krymtz m54epzu1 :c86 jts 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 1c p 6m4 ye8k:urm/k5mtz yjz+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 trials.