97.01: A force F direcycmo* cxn41.lx/ ikhh1s ae .2ted at an angle of θ above the horizontal is used to pull a crate a distance D across a ley 1 4l.okh 2/xmc shi*c.xa1envel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which aw /i8jwg:p 6gis moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the i g/gpw:j6aw8horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogrtz3qb0 161 0k wksxi0daa*p a( m7hxmkam sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much p1p0m10ka ms*b 0tqx(whxz3i kk6 ada7ower was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration5 zu(0hopj):sb tcv)f on a horizontal surface for 5.00 s. The block’s kinetic energy strict(5puvb z ch)0ofs)tj:ly 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 cqvj *(k37v gf uniform acceleration on a horizontal surface for 5.00 s. The block’s kijkvc3*( qv g7fnetic 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 exerteaca. ub:o3i6 t6h52zl9wqbqyf;t /oyd on a 3.0 kg block for 5.0 s. 6li9bo:/26 5ahu.;bwft 3oyyq zaq ctThe 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 direc21k6yizzig. ited to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at res g21ziiykz.6it 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 fr0 8a5gg aajksq pppj3.+z9p3 zj(b f 0i-4xhtjictionless 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 direction. Which of the followingxpa+qpg j ft-j(4 pb.5jizhak z3s0 a9g38p0j correctly describes the above situation?

  03.14: A fan blows the air and gives it kineti eg k5i3igob47ab 8+ 0(bgjkjgc energy. An hour after the fan has been turneb+k45g 0 g83ebajkgib7g(i ojd off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg hevt +avk xgs4ba zc776 *xem9*as a position of 3.0 m, a speed of 4.0 m/s, and an acceleration of9xvetak zsgvb76xc7m* *4a+ e $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbon.rh;zb tlism*6 78iv oks is on the middle 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 floor, how much work does he do on the box. The box has a mass of 10.0 vimts.l h 6i8b;*r7n zkg.

  02.32: An automobile engine deli- + 9w n )ase)scd3 p7gkwuidx9cj8mn:vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 +i 9ks-7udg)ms wwp)x endc3a: 8nj9cmph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the w-1m0by9k pmtkm / dg,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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inclinem-1pm9bkt gdky,m0/ w.
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 the b9juupsf 1tf 87ottom 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 tp9f7us juf18a 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 rightx82oal7 pmes2 w :ymmn30*mr l, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A lm2p :a me3omr7ynwsx*0l2m8has 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 force acting on the object during the time interval 94/kgmrmqj zs;l l +1vof th;4m+l kmjvgzl 1qr/9s e acceleration?

  12.08: Through what distance does twga0/ mxlbv0ek s n-53he object move during the time interval of th-beglnk/w5mv 03ax0 s e acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point massn- * 7vs,ocxzvvxhf8 2 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 en hf,n7-vx 8zo2c xvvs*ergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy wh8bz+g d1joao-h* ppw,ile its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of tz+aj8dh ,-pg*po 1bwo he crate

  94.38: A force F at v+ -gmxj5ok3 tan angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at const3og -5+mk tjxvant 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 ik:;coou)2qzftj 3 4gforce and delivers a useful power output of 0.10 w to raise a block verticaizg24: ;3ofkt qcjo )ully 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 surface tqce;x81ha-s 2rxm4k 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 tmh xq8;-skexa2cr1 4on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ballo:l 5 (zvonzfj)cxy08 is held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the follo8 c0znylvj()xf z:o 5owing 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 mshgbm c64fz6j+;ome/u6zx( yoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the miniz (6ozg6ysmfb6;c hx 4ju/em+mum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly untiqp 4-x v)bj; xn2omay0ds/w9al it stops. If the balv4y /aj92db-w )ms xa0op qx;nl travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but iqn.gbp47ub utfkyb-b (f, s q5,q g;1odentical kinetic energies and the three following statements. Which of the above statements would beq,51bu-ng f bt.,f(buykb;q 4 oq p7gs 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 .e3g tx2kna01xcpj/49 p1h9eido xfy the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the np h03j1kex. dyifpecx9g91ta2o 4x/ change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigh 0.ku(* ovnobmj t8)sxt 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 motion. Ho *kt80s)x .mjoubvn(ow 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 from aheightH ac/ouaf6pd m:x;m :3uzbove 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 object wh om6 azu;f pm3:u:cd/xile coming to rest?

  12.48: An object of mas+ l1lcvh :hlj7s M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lastingc7l h:+ljl1v h 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 lengthr4v)xny/ jp f0 L is pulled sideways until the cord m 0/)jpxy4frnv akes 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 unknown angle. The slelbg2;dj0fbq1i1 ll ocb st44/b6q8d ed, 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 slidl bie ldd;jcq/s 6b lft 02q4gbb481o1es 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 10-m nj8bpaf84.np l*pv iz1cwb *)eter 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 )pjibnzpl*wpav1 .*n8 c48bf 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 the 6.0frjtu1.2sb (j 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 (fjrbt. jus12 the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dx:/ b92p f0ou/o:eu) tmb pxkzo/ftu/ ropped from rest from the top of a tall tower. Ball A is m: beuktf) z2 u/fox//t:p0ob/ox9p udropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initikrp 2g i23y29kzkk(0kh7wxpt al non-zero speed v. The object rises to a maximum height H above the launch point. The t0k hk23zgkk27 wyix2k(pr p9person 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 ofbefrr8 4 x0.an 20 N/m. Tf4 a8n.r0bxrehe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentialybx01nr dl5 dg 9; dn;vw31si-iy 0nhl energy. What is the maximum speed it can impart to a 2.0-kd1i3-lyb ;syxr n whld9ni0;d nv1g05g object ?

  

  10.31: An object of mass M starts rmcycbk+j c sgsdu;-*p 8323e v1w:bcfrom 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 forws 3c b v +3:p c*8gekrus2c;ymjd1b-cce 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.