97.01: A force F directed at an angle of θ above the horizontal is8( ub3ckfy j+ 3y;rnl,4 gukdz used to pull a crate a distance zlnc4u f yk (r3d jygb+;8,k3uD across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of m,uig++nn ule:ass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball +iu+n:, luneg by her hand is

  99.14: A construction lay)mz3f7r q qq*borer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secon q)qm7yqf*z 3rdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelbc4ex.n5yb5hp 3w (wseration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in nyxhwcb( s4b5ew.p3 5this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bloh b8k:heq9 k.r,oahr ;ck slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic .:b ehrk;h hok raq89,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 f :2qi d)k n;v7apa )dx/7yvflthe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sfynd)q fi)ak:27;pxv7ad/vl urface.
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 block z i *i;j5 gs1 :2xe* ytpe6)ltcmdjuni/)6ciffor 5.0 s. The block was initially at rest and slidese2/f) pt5 :l ;s eciiuzd6tjyin1*im*cx6g ) j 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 frictionle.l+bk d3s,xj5h/qwfhss 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 t h s 5/,j+fdlqw3.hkxbhe following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic enesm9 *;x t7bf/ia((i4bynnwe urgy. An hour after the fan7e btxnf m;a/s( wy4buin9 *(i has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.u 8lj31;lal0yb bcw*c 50 kg has a position of 3.0 m, a speed of 4.0 m/s, a83uljc0 lw;lcb*a1 ybnd 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 middle sh:m*zw hyp 7nz+elf 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 o:7+zm *yz pnhwf 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32mhk6achub45r 3a6c 7 /talcm2 horsepower) of power to a car's driving wheels. Ial3umh b6 /cc7ka 65t hramc24f 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?

  09.13: In the figure to the right, a box move eegjb-v /6la k4cn1v7s 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 reaches the top of tg/encj14va -76e kl vbhe 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./)m+ajk dg-iq00 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 q-+j/mk ag id)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, eac zcwl 8 tcs7pzhg+0b5i-:kwk. h starting from rest, along a straight roadz- w 7itk58s whk+clzpc:0g b.. 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 force acting on the object during the td il:9 hv k// *q10skyeianpi6egfh /4ime interval of the acceleratio// d1phy0afgqe6k4 * /ike9s liihn:vn?

  12.08: Through what distance does the object mova ;/yy9xo* wqf pw59n2yz0hv de during the time interval of the acceleratiho;*za w09 yv9ny5p2wyf q dx/on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed 0a t6dwfuh (- z;v.yycfrom 6.00kg.m/s to 14.0kg.0d(tz6a .-vycu; ywf hm/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 e i*zy)a89uizgw4 sj qlj+ni *5nergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cratesy5i unw*zjgi)a4i l *zq9+ j8

  94.38: A force F at an angle θ above sp3:a5 ws*wetthe horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. Ths5tsp* w3 :ewae 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 uzs7aq s b(-3kubz 1i4ypward force and delivers a useful power output of 0uyb kzsq347 (az -b1si.10 w to raise 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 released gu z37- i;c v0upjg9egfrom 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 Earth by the 1.00 k3vp0j-cg ;e7g g9uziu g object during the fall?

  96.18: A rubber ball is held moti ,4b.a7folfyaqow+9 qonless a height ho above a hard floor and released. Assuming that the collision with the floor is elasya9bo la7o+qfwf. ,q 4tic, 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 barrikxh, t, +cg 4.bgtsi3e (l +ji)idjc8yer ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force ntgi+d 8(cihbjec. ,4+lytijs, 3gx )kecessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly jd/ f5*pe.3xf. wcdx 97xktus until it stops. If the balujk x/ c9xx53.e* td7wf.dsfp l travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differh-pon h87jf/9v sp6v kent masses but identical kinetic energies and the three following statements. Which of the abohkj vp 9f vph6sn-o/87ve 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 ay2;b8w, 9dr*dya:rp rh h9xzrn initial speed of 4.60 m/s. Ignorind2 rx 9yy,8:rh *r 9pzrah;bwdg air 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 8piwg 0d6 2ypn5z2amm 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 cm2dnm58 ai6gp yz2pw0ontact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dror ylz 2k1qq88tpped from aheightH above the ground. The object crashes into8 l2kyq18tz rq 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 while coming to rest?

  12.48: An object of mass M is8uylg3 f*mi g4 dropped 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 height H/2. What was the magnitude of the average net force acting on the mass during g8im4l*y3gu fthe collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways un2kt7d x7 ksu se5ls6m)5ik nf)til the cord maktk 7 nk)s7silxmk6)u5 f ds5e2es 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 ,at:t)xg* x;hwwuc0cat 0hl1 u 78kleof 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 position at the bottom of the *kgc0:1c wwxu )a t7l x0luaht,8hte;hill?

  06.09: A deliveryman moves 10 cartons fromjuy6;5oj abk8u y +j,m the sidewalk, along a 10-meter ramp to a loading dock, which 5o+ ,j8yk;6jujbm ua yis 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 showne)h :y:kb6smdj sgz(sw.fj72 w;g 1w v 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 reprf:1 mw 2j);h(wsvg6db:g w. zky7jess esents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls viq sl:ne-8 z b gp1c6-sty;a8A and B are each dropped from rest from the top of a tall tower. Bal1 - ; -san:eslb6zt pvgc8iq8yl A is dropped 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 stral 01q2w 9bbi )9u+s 2eqmrqgvaight 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 with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the lau gu2 q99w+li)ma rev1q sq20bbnch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has1p1 g;z4 lyhjgnat0i6 a spring constant of 20 N/m. The po4gg piz1jy ;06n h1taltential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Ww :/ew bwbw6/e4;rxy shat is the maximum speed i ;exsew4:/r b/wbwyw6 t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M sus/yu8lba nmc;ph w5 e37 +t5itarts 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 cwsul+/e 8ayi5b73 5hnput ;mthe 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.