97.01: A force F directed at an angle of θ above the t7rnw18ai p8shorizontal is used to pull a crate a distance D across a level floor. The work done by the t 7api81nw8 rsforce F is

  97.33: A softball player catches a ball of mass m, sd3,p*c5l jqmrh1: awwhich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant decelerac* 31mjs:lrd, 5qap whtion, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sh *vlm*xuxn6jez7cwbe- 1/z 5k eet of wallboard 3 meter above the floor for 4 seconds. k6zcx7 l5zvju * *wbme/xen-1 During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele3z(m( g sx rpjvz75n5uration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases frov(gpmx zjr35n (uz57 sm 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 q-m 2f0b:ky f6gdv4hhtqt/ /stx k9h6slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s th:gqkt6sqvdh 240/h / -ky mxfb9ft6kinetic 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 exertf2*pc j;c m(sry, h. vvz02yobhg;ty7ed on a 3.0 kg block for 5.0 s. The block was initially at rest and slide2r y 7;y*v2zchhf.post mc,bvg (j;0ys 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 0xy; ve((mof ja 3.0 kg block for 5.0 s. The block was initially at rey(evxmfo ;0j( st 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 ressh0e un 3bfe( -ycguv:i)k./w ton 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 the other direction. Which of the following correctlge : (ukn0) i.3eywchvfu-sb/y describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour7x0 l ljr(nql3pu:hq2k m*( pa after the fan has been turned ofp al *l(70n klqqur23mjxh (:pf,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5t+ n9nfd(wot: 0 kg has a position of 3.0 m, a speed of 4.0 m/s, and an d(ton nft :w9+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 middle shelf in the ,cpe p1 r7uox(rj 4lc3bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m pu47e1p ocr(j c xl3r,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 deliu6 k4g diy5wv(vers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a condgi(k 6uwv5y4 stant 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 b 8:szpbg nwg06ox 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reachw n0spbz6:gg8 es 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 bp zyib/s g3+z3ox 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 3z3siyb/gz+ preaches 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 starting from rest, along a st sa ikd 39g(lsx2g0vn7raight road. CarA has twice the acceleration of Car B. After traveling a distance Fg9702( snilxvds3 gak, 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 force acting on thee q2ve2j,ifc51w2ex x object during the time interval of the accelwx2fc2 j ,viqex25 1eeeration?

  12.08: Through what distance does the object movtsxsel s,-4wau3,h cmg , 12z8+brvqke during the time interval of the acceler 4s ,m8z1l su,thbq2 kswc,-gea3+vxration

  12.19: The magnitude of the linear momentum of a 4.00 kg point,7g( ;m yimg uyilw9z. 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 this zigi(9ygwmuy l7,m; . time interval?

  14.11: A crate gains 36*y3gw,t is7aehpy uyus )u73;.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one oyity)euu*w7g3a;u7 sshy 3,p f the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizomj1veb5n j0o; o xk+/xntal is used to pull a heavy suitcase of weight mga distance d along nb0+; xxv/ oe15 mokjja 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 up)o 5mpu(dyk z0ward force and delivers a useful power output of 0.10 w to raim(o)5z pkud0yse a block 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 relfy n:rm-1fy)nz.l/ p)mr shxz(www:)eased 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 one of the following choices best represents the amount of work done by the gravitational force acting on the E npm z: fn.s:()l/ 1h)xw-fzrmwwyry)arth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionlbg03-n2ikr56irk, v qt,kqbl ess a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, b,i-niq 63tvb lkgk5,q kr0 r2which 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 s)iw ijue -yo5v,p8op6hw)(smees a barrier ahead. If the car takes 95 meters ey),( o68mov)ppsiwi- j5 whuto 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 uniformly until it stops.bfkk6nxn)d8 i8 es l-: If the ball travels 15 meters, 8)n6dk bl:x8nkef si- what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mayw 1+z94 2eawdbsom )zsses but identical kinetic energies and the three foll+wyow sdz be9am)124zowing 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 vertiz 8 ,e7wfwy.e;sehy-tpa3u :c cally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is thw,;eyc73stp ef eu:zah. -8yw e change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete sui5t71wf cg lw(rface. The boy, of mass M, lfg1ww( lic7t5eaves 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 dropped from aheightH above the ground.1v* jeypfg8 sd9et p1/ 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 negligidevfe9 p spt8 1y/g*1jble, 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 from aheight H above the groj)z3d) :5v1hfazetbd g 1 w9maz,nkk2und. 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 52v,jf)31 ak9dw:gzhnztaeb )z mdk1the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is p;fp zkmk 7*pck56g.fsulled sideways until the cord ma5kzmf6; k7kc g fpp.*skes 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.xghcic4 kv)/2 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 reg4)c2cik hxv/st. 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 from the sidewalk, along a 10-meteqwiti.*xtno .0 lg f;/7ibdg0r 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 on the cartonwniid ifqb.* gxo.t07lt ;g0/s to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figur2pxko7n0 xhkei ,c3s 2e) 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 oh7,xxk3n 2 iekspc20following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical b3)+34mbx n ctr pims)bowling 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 bam4m3xnr3bctb p)i)s+ll 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 obm+tbzxcj m.1n z )uj q(6r*a)f mass M straight upward with an initial non-zero speed v. The 1b)a)ub*rztjqm nj+x( cz6.mobject 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 stretche6zdwm1sw2.y2v,i *2vrg mlra s a spring that has a spring constant of 20 N/m. The potential energy stored in mg,wrimv z1rws2*6ydv22 l.athe spring is:

  97.10: A compressed spring has 16 J of potential energy. W+dy2t pzu*+nrhat is the maximum speed it cann+z 2* +tuyprd impart to a 2.0-kg object ?

  

  10.31: An object of macovfrx i q: z,z-q ::ww-io92jss 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 the incline and the object for both ti : i:xw2:w-rvfq9 o-jo,zzcqrials.