97.01: A force F directed at an lm05pbcxqep.*80 pcz angle of θ above the horizontal is used to pull a cratlp0p5eb8z* pc.q xm0ce a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is wnz/.3wng5ayh bb1n /moving toward her with horizontal speed v. Whi3g b wz/nb/ny wanh.51le 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 laborer holds a 20 kilogram sheet of wallboard wy4vn1yvduy h*+k7(a 3 meter above the floor for 4 seconds. During these 4 secondshow much p vyyva4*(n1 ky w+7udhower was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratioj( ce dgww4 dum e.;wf9z:n,9nn on a horizontal surface for 5.00 s. The block’s kinetic energy strcez d 4.;g:9nd wu,e9w( mfnjwictly 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 acceleration on a horizsl4p j;*jxkc 4ontal surface for 5.00 s. Thecpk 4xj4ljs ;* block’s 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 t ew(6, j9qyc dzl13jhwyyc/f*0ekk u2he right is exerted on a 3.0 kg block for 5.0 s. The blj (1*e2wqku3y/0 9 djk6zcw,f ylech yock 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 isq heqp.ui /2c7 exerted on a 3.0 kg block for 5.0 s. The block was initiallyuq/p2qci 7h.e 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.(y1 izi2f5miqgo2b j frictionless frozen pond throws a 1 kg hammer in one direction. Aftermo5i(.ifz2 q1gbyi2 j 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 kinetic energy. An hour after yo7scjcffv p/bg 6 ,9; uus50jthe fan has been turned of ;76of ygv/5j0bcspcjf 9usu ,f,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blockh y .)xv91e vfwb.up-r of mass 0.50 kg has a position of 3.0 m, a speed of w9fvx )u vep.h1-r .by4.0 m/s, and an 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 mid6 t y3vnngwb91i yt84v w9h4qadle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to tvn wbg1vi8n9 4qwa3t6hy9 4 tyhe shelf 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 32 horsepower) of 3fwxe oer5)nwe3h:q8 power to a car's 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:8 3w3wnf x)eqer5eoh?

  09.13: In the figure to the right, a box moves with speedebfo4d+qa x- doh-(v6 :kqh +n 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant adk+h:4hbq -v o dfnxa-(6e+qo cceleration 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 box moves with speed 5.00 m/s os +sy;13gg62ox9jbdpn sulin ,p 053ruv- nnat the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pusgnd9 y l5nb v ,3ruos2s6o;3 p -ingjxn01+spuhed 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 rigvlf5c0ua,7e2 na 81twwf x,laht, each 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 distance F, what is its l0v,l 7twfaaxe5a8 2,n 1wcu fspeed in terms of B?

  12.07: What is the net force /13hl9q lyv zaacting on the object during the time interval of the accelera1/3qlya9 lvhz tion?

  12.08: Through what distance does the obje7rh 5v dpb;;mgct move during the time interval of the acce ;bp;h7vrmg5d leration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang-:2eu* ztvga -x ts;mned from 6.00kg.m/s to 14.0kg.m -znau2v-mg t:et*;x s/s in a 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 while itn zk5qo 43mqg3s speed is increased from 2.00m/s to 4.00m/s. Which one 3 km5nq3o zq4gof the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontgii y/0o 2mvk3al is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velio/k3g iy2 0mvocity. 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 power output fedk))+i;xo6 u,ogh uof 0.10 w to raise a block 6fu x,)kg hdouo e+i;)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 is released from rest near the surfi6rmt 8 ;2+jy)lz2v tria(mlrkl9:ho ace 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 force acting on the9r+yihvljmlzo;t rl6:kr8 2m i)t a (2 Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball icus9iv71svd) 3cq d7ns held motionless 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 energyn 7csc)d91s7q3udvi v E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Thk 2j1w;6d8.mgcjysf4r u.ow ae driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitudd go2.c68j1m. wawrykj4 sf;u e of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it skw1w5e7 - zwsztops. If the ball travels 15 meters, what was the average net force applied while it was coming to a sz-7w w5zw ek1stop?

  02.26: Consider two laboratory cartmyyg9ex +rqe :) t7x4rs of different masses but identical kinetic energies and thrg9e :r7 e)m+y4xytqx e 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 tossed vatpnd/;2 f ,x-otf8xa ertically in the air with an initial speed of 4.60 m/s. Ignoring air t2,-x axft;8p/oafdn resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationrgofy; 6ytd6gwkw7; , ary 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 concrete d7 ygw; w,ogtf6k6dr y;o on the boy?

  02.48: An object of mass M i14 ii 1qvmy b)msgnw6/lhhx;, s 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/s4wh bv hi/;q6li, m)1mn1 yxg2. 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 fromsw- ;gkv fml8i z /dy8y:tud/* 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 force acting on the mass during the collision with the sur/ 8fs lyim-gdut z:y*k8;v/ dwface?

  96.38: A pendulum bob mass mon a c k2 1;en)ha0 fffef(yiord length L is pulled sideways until the cord makes an angl(k2ya e)ie0f;f 1fnfhe
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 unknown and7 :*kt25jeey jk4tjq gle. The sled, which star5:qt7 jdk2jtje4y* ek ted 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 position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons fromvwgso815lmx+ 8t)5lekl7p* + wgqama the sidewalk, along a 10-meter ramp to a loadingwa8g tqw7 l+ ve5+ p8lsl*am)1xom5k g 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 on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for 7vcku3p+3-wfmp r pr;the 6.0 meter motion of the box upward along the incline. The masspv 73 f3rur ;mpc-w+pk 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 blr:driyas,:sv:c e ,5owling balls A and B are 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:5e s ariys ,r,::lcdv mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straigwzs;oba81;-b :tc w(pm l; twnmah.)f ht 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 wwbzw-.mcanf1awt;t;;ob hm( 8ps)l :ith 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 t/ql3-/k ggzbnvax2;xhat has a spring constant of 20 N/m. The zx;l2x gn avkgq/b3/-potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential e f(6sgpwf7c9s nergy. What is the maximum speed it can im6pg 9s(sf fwc7part to a 2.0-kg object ?

  

  10.31: An object of mw4gtj. a,hs5w6qb5xp+ szek +ass M starts 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,+ . bswxtzh ajeg 4+w5p5sqk6he incline and the object for both trials.